BCM6123XD1E5135YZZ_17

BCM^®Bus Converter

BCM6123xD1E5135yzz

S

®

C

NRTL US

C

US

Isolated Fixed-Ratio DC-DC Converter

Features & Beneﬁts

Product Ratings

• Up to 35A continuous secondary current

• Up to 2735W/in³power density

• 98% peak efﬁciency

V_PRI= 400V (260 – 410V)

I_SEC= up to 35A

K = 1/8

V_SEC= 50V (32.5 – 51.3V)

(no load)

• 4,242V_DCisolation

Product Description

• Parallel operation for multi-kW arrays

• OV, OC, UV, short circuit and thermal protection

• 6123 through-hole ChiP package

The BCM6123xD1E5135yzz Bus Converter (BCM^®) is a high

efﬁciency Sine Amplitude Converter™ (SAC™), operating from

a 260 to 410V_DCprimary bus to deliver an isolated, ratiometric

■■2.494” x 0.898” x 0.284”

secondary voltage from 32.5 to 51.3V_DC

.

(63.34mm x 22.80mm x 7.21mm)

The BCM6123xD1E5135yzz offers low noise, fast transient

response, and industry leading efﬁciency and power density. In

addition, it provides an AC impedance beyond the bandwidth of

most downstream regulators, allowing input capacitance normally

located at the input of a PoL regulator to be located at the primary

side of the BCM module. With a primary to secondary K factor

of 1/8, that capacitance value can be reduced by a factor of 64x,

resulting in savings of board area, material and total system cost.

• PMBus™ management interface*

Typical Applications

• 380V_DCPower Distribution

• High End Computing Systems

• Automated Test Equipment

• Industrial Systems

Leveraging the thermal and density beneﬁts of Vicor ChiP

packaging technology, the BCM module offers ﬂexible thermal

management options with very low top and bottom side thermal

impedances. Thermally-adept ChiP-based power components,

enable customers to achieve low cost power system solutions

with previously unattainable system size, weight and efﬁciency

attributes, quickly and predictably.

• High Density Power Supplies

• Communications Systems

• Transportation

This product can operate in reverse direction, at full rated power,

after being previously started in forward direction.

* When used with D44TL1A0 and I13TL1A0

BCM^®Bus Converter

Page 1 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Typical Application

BCM

TM

EN

enable/disable

switch

VAUX

F1

+V_PRI

–V_PRI

+V_SEC

V_PRI

C_PRI

POL

–V_SEC

GND

PRIMARY

SECONDARY

ISOLATION BOUNDRY

BCM6123xD1E5135y00 at Point of load

BCM

SER-OUT

EN

SER-IN

enable/disable

switch

SER-IN

FUSE

+V_PRI

–V_PRI

+V_SEC

V_PRI

C

POL

I_BCM_ELEC

–V_SEC

PRIMARY

SECONDARY

SOURCE_RTN

Digital

Supervisor

D44TL1A0

ISOLATION BOUNDRY

Digital Isolator

Host µC

I13TL1A0

NC

PRI_OUT_A

SEC_IN_A

SEC_IN_B

SEC_OUT_C

SEC_COM

VDDB

t

SER-IN

+

–

V

EXT

VDD

TXD

PRI_OUT_B

PRI_IN_C

SER-OUT

SGND

RXD

PRI_COM

SGND

PMBus

SGND

BCM6123xD1E5135y01 at Point of load

BCM^®Bus Converter

Page 2 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Typical Application

PRM

BCM

ENABLE

TRIM

VAUX

enable/disable

switch

TM/SER-OUT

EN

REF/

REF_EN

VTM

V

OUT

Adaptive Loop Temperature Feedback

VTM Start Up Pulse

AL

VT

VC

IFB

TM

VC

PC

+OUT

SHARE/

CONTROL NODE

SGND

enable/disable

switch

R

AL_PRM

TRIM_PRM

SGND

VAUX/SER-IN

+V_PRI

LOAD

C

R

O_VTM_CER

I_PRM_DAMP

O_PRM_DAMP

FUSE

+IN

–IN

+OUT

–OUT

+IN

–IN

+V_SEC

L

I_PRM_FLT

O_PRM_FLT

C

V

C

R

I_PRM_CER

PRI

I_BCM_ELEC

O_PRM_CER

–V_PRI

–V_SEC

–OUT

SGND

PRIMARY

SECONDARY

PRIMARY

SECONDARY

SOURCE_RTN

LOAD_RTN

ISOLATION BOUNDRY

SGND

BCM6123xD1E5135yzz + PRM + VTM, Adaptive Loop Conﬁguration

V

REF

BCM

SGND

REF 3312

IN OUT

PRM

SGND

Voltage Sense and Error Amplifier

(Differential)

TM/SER-OUT

EN

GND

VAUX

ENABLE

TRIM

enable/disable

switch

VTM

REF/

REF_EN

SGND

Voltage Reference with Soft Start

SGND

VT

VC

IFB

TM

VC

+OUT

AL

SHARE/

CONTROL NODE

enable/disable

switch

VTM Start up Pulse

VAUX/SER-IN

+V_PRI

SGND

V

+

V –

PC

VOUT

+IN

R

LOAD

SGND

C

–IN

I_PRM_DAMP

O_PRM_DAMP

O_VTM_CER

FUSE

+IN

–IN

+V_SEC

+OUT

–OUT

+IN

–IN

L

_{External Current Sense}L

O_PRM_FLT

C

O_PRM_CER

V_PRI

I_PRM_FLT

C

I_PRM_ELEC

I_BCM_ELEC

–V_PRI

–V_SEC

–OUT

SGND

PRIMARY

SECONDARY

SOURCE_RTN

PRIMARY

SECONDARY

ISOLATION BOUNDRY

SGND

BCM6123xD1E5135yzz + PRM + VTM, Remote Sense Conﬁguration

BCM^®Bus Converter

Page 3 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Pin Conﬁguration

TOP VIEW

1

2

+V_PRI

A

B

+V_SEC

A’

B’ –V_SEC

C’ +V_SEC

D’ –V_SEC

TM/SER-OUT

EN

C

D

VAUX/SER-IN

–V_PRI

E

6123 ChiP Package

Pin Descriptions

Power Pins

Pin Number

Signal Name

Type

Function

A1

+V_PRI

PRIMARY POWER

Positive primary transformer power terminal

Negative primary transformer power terminal

PRIMARY POWER

RETURN

E1

-V_PRI

+V_SEC

-V_SEC

SECONDARY

POWER

A’2, C’2

B’2, D’2

Positive secondary transformer power terminal

Negative secondary transformer power terminal

SECONDARY

POWER RETURN

Analog Control Signal Pins

Pin Number

Signal Name

Type

Function

B1

C1

D1

TM

EN

OUTPUT

INPUT

Temperature Monitor; primary side referenced signals

Enables and disables power supply; primary side referenced signals

Auxilary Voltage Source; primary side referenced signals

VAUX

OUTPUT

PMBus Control Signal Pins

Pin Number

Signal Name

Type

Function

B1

C1

D1

SER-OUT

EN

OUTPUT

INPUT

UART transmit pin; Primary side referenced signals

Enables and disables power supply; Primary side referenced signals

UART receive pin; Primary side referenced signals

SER-IN

INPUT

BCM^®Bus Converter

Page 4 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Part Ordering Information

Max

Secondary

Voltage

Secondary

Output

Current

Product

Function

Package Package

Max Primary

Range

Identiﬁer

Temperature

Option

Size

Mounting Input Voltage

Grade

BCM

6123

x

D1

E

51

35

y

zz

00 = Analog Ctrl

01 = PMBus Ctrl

T = TH

T = -40°C – 125°C

Bus Converter

Module

61 = L

23 = W

51.3V

No Load

410V

260 – 410V

35A

S = SMT

M = -55°C – 125°C 0R = Reversible Analog Ctrl

0P = Reversible PMBus Ctrl

All products shipped in JEDEC standard high proﬁle (0.400” thick) trays (JEDEC Publication 95, Design Guide 4.10).

Standard Models

Max

Secondary

Voltage

Secondary

Output

Current

Product

Function

Package

Size

Package

Mounting

Max Primary

Input Voltage

Range

Identiﬁer

Temperature

Grade

Option

BCM

6123

T

D1

E

51

35

T

00

01

0R

0P

Absolute Maximum Ratings

The absolute maximum ratings below are stress ratings only. Operation at or beyond these maximum ratings can cause permanent damage to the device.

Parameter

Comments

Min

Max

Unit

+V_{PRI_DC}to –V_{PRI_DC}

-1

480

V

V_{PRI_DC}or V_{SEC_DC}slew rate

(operational)

1

V/µs

+V_{SEC_DC}to –V_{SEC_DC}

TM/SER-OUT to –V_{PRI_DC}

EN to –V_{PRI_DC}

-1

60

4.6

5.5

4.6

V

-0.3

VAUX/SER-IN to –V_{PRI_DC}

BCM^®Bus Converter

Page 5 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Electrical Speciﬁcations

Speciﬁcations apply over all line and load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Attribute

Symbol

Conditions / Notes

Min

Typ

Max

Unit

General Powertrain PRIMARY to SECONDARY Speciﬁcation (Forward Direction)

Primary Input Voltage range,

continuous

V_{PRI_DC}

260

410

V

V_{PRI_DC}voltage where µC is initialized,

(ie VAUX = Low, powertrain inactive)

V_PRIµController

V_{µC_ACTIVE}

120

Disabled, EN Low, V_{PRI_DC}= 400V

T_INTERNAL≤ 100ºC

2

PRI to SEC Input Quiescent Current

I_{PRI_Q}

mA

4

V_{PRI_DC}= 400V, T_INTERNAL= 25ºC

V_{PRI_DC}= 400V

10

14

21

15

22

6

PRI to SEC No Load Power

Dissipation

P_{PRI_NL}

W

V_{PRI_DC}= 260V to 410V, T_INTERNAL= 25ºC

V_{PRI_DC}= 260V to 410V

V_{PRI_DC}= 410V, C_{SEC_EXT}= 100µF, R_{LOAD_SEC}= 50% of

full load current

6

PRI to SEC Inrush Current Peak

I_{PRI_INR_PK}

A

T_INTERNAL≤ 100ºC

12

DC Primary Input Current

Transformation Ratio

I_{PRI_IN_DC}

K

At I_{SEC_OUT_DC}= 35A, T_INTERNAL≤ 100ºC

Primary to secondary, K = V_{SEC_DC}/ V_{PRI_DC}, at no load

4.5

A

1/8

V/V

Secondary Output Current

(continuous)

I_{SEC_OUT_DC}

I_{SEC_OUT_PULSE}

P_{SEC_OUT_DC}

P_{SEC_OUT_PULSE}

35

40

A

10ms pulse, 25% Duty cycle, I_{SEC_OUT_AVG}≤ 50% rated

Secondary Output Current (pulsed)

I_{SEC_OUT_DC}

Secondary Output Power

(continuous)

Speciﬁed at V_{PRI_DC}= 410V

1750

2000

W

Secondary Output Power

(pulsed)

Speciﬁed at V_{PRI_DC}= 410V; 10ms pulse, 25% Duty

cycle, P_{SEC_AVG}≤ 50% rated P_{SEC_OUT_DC}

V_{PRI_DC}= 400V, I_{SEC_OUT_DC}= 35A

V_{PRI_DC}= 260V to 410V, I_{SEC_OUT_DC}= 35A

V_{PRI_DC}= 400V, I_{SEC_OUT_DC}= 17.5A

V_{PRI_DC}= 400V, I_{SEC_OUT_DC}= 35A

96.9

95.7

97.5

96.3

97.4

PRI to SEC Efﬁciency (ambient)

PRI to SEC Efﬁciency (hot)

η_AMB

%

98

η_HOT

η_20%

96.8

%

PRI to SEC Efﬁciency

(over load range)

7A < I_{SEC_OUT_DC}< 35A

92

R_{SEC_COLD}

R_{SEC_AMB}

R_{SEC_HOT}

F_SW

V_{PRI_DC}= 400V, I_{SEC_OUT_DC}= 35A, T_INTERNAL= -40°C

V_{PRI_DC}= 400V, I_{SEC_OUT_DC}= 35A

12

16

22.6

31

20

33

PRI to SEC Output Resistance

mΩ

V_{PRI_DC}= 400V, I_{SEC_OUT_DC}= 35A, T_INTERNAL= 100°C

Frequency of the Output Voltage Ripple = 2x F_SW

24

39

Switching Frequency

1.05

1.10

1.14

MHz

mV

C_{SEC_EXT}= 0µF, I_{SEC_OUT_DC}= 35A, V_{PRI_DC}= 400V,

20MHz BW

250

Secondary Output Voltage Ripple

V_{SEC_OUT_PP}

T_INTERNAL≤ 100ºC

350

Primary Input Leads Inductance

(Parasitic)

Frequency 2.5MHz (double switching frequency),

Simulated lead model

L_{PRI_IN_LEADS}

L_{SEC_OUT_LEADS}

L_{IN_INT}

6.7

1.3

nH

µH

Secondary Output Leads Inductance

(Parasitic)

Frequency 2.5MHz (double switching frequency),

Simulated lead model

Primary Input Series Inductance

(internal)

Reduces the need for input decoupling inductance in

BCM arrays

0.56

BCM^®Bus Converter

Page 6 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Electrical Speciﬁcations (Cont.)

Speciﬁcations apply over all line and load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Attribute

Symbol

Conditions / Notes

Min

Typ

Max

Unit

General Powertrain PRIMARY to SECONDARY Speciﬁcation (Forward Direction) Cont.

Effective Primary Capacitance

(Internal)

C_{PRI_INT}

C_{SEC_INT}

C_{SEC_OUT_EXT}

C_{SEC_OUT_AEXT}

Effective Value at 400V_{PRI_DC}

Effective Value at 50V_{SEC_DC}

0.37

25.6

µF

Effective Secondary Capacitance

(Internal)

Effective Secondary Output

Capacitance (External)

Excessive capacitance may drive module into SC

protection

100

Effective Secondary Output

Capacitance (External)

C_{SEC_OUT_AEXT}Max = N * 0.5 * C_{SEC_OUT_EXT MAX}, where

N = the number of units in parallel

Powertrain Protection PRIMARY to SECONDARY (Forward Direction)

Startup into a persistent fault condition. Non-Latching

fault detection given V_{PRI_DC}> V_{PRI_UVLO+}

Auto Restart Time

t_{AUTO_RESTART}

V_{PRI_OVLO+}

V_{PRI_OVLO-}

292.5

357.5

450

ms

V

Primary Overvoltage Lockout

Threshold

420

405

436

426

10

Primary Overvoltage Recovery

Threshold

440

V

Primary Overvoltage Lockout

Hysteresis

V_{PRI_OVLO_HYST}

t_{PRI_OVLO}

V

Primary Overvoltage Lockout

Response Time

100

1

µs

ms

A

From powertrain active. Fast Current limit protection

disabled during Soft-Start

Primary Soft-Start Time

t_{PRI_SOFT-START}

I_{SEC_OUT_OCP}

t_{SEC_OUT_OCP}

I_{SEC_OUT_SCP}

t_{SEC_OUT_SCP}

t_OTP+

Secondary Output Overcurrent Trip

Threshold

37.5

52

47

59

Secondary Output Overcurrent

Response Time Constant

Effective internal RC ﬁlter

3.6

ms

A

Secondary Output Short Circuit

Protection Trip Threshold

Secondary Output Short Circuit

Protection Response Time

1

µs

°C

Overtemperature Shutdown

Threshold

Temperature sensor located inside controller IC

125

BCM^®Bus Converter

Page 7 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Electrical Speciﬁcations (Cont.)

Speciﬁcations apply over all line and load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Attribute

Symbol

Conditions / Notes

Min

Typ

Max

Unit

Powertrain Supervisory Limits PRIMARY to SECONDARY (Forward Direction)

Primary Overvoltage Lockout

Threshold

V_{PRI_OVLO+}

V_{PRI_OVLO-}

V_{PRI_OVLO_HYST}

t_{PRI_OVLO}

420

405

436

426

10

450

440

V

Primary Overvoltage Recovery

Threshold

Primary Overvoltage Lockout

Hysteresis

V

Primary Overvoltage Lockout

Response Time

100

226

244

15

µs

V

Primary Undervoltage Lockout

Threshold

V_{PRI_UVLO-}

200

225

250

259

Primary Undervoltage Recovery

Threshold

V_{PRI_UVLO+}

V_{PRI_UVLO_HYST}

t_{PRI_UVLO}

V

Primary Undervoltage Lockout

Hysteresis

V

Primary Undervoltage Lockout

Response Time

100

µs

From V_{PRI_DC}= V_{PRI_UVLO+}to powertrain active, EN

Primary Undervoltage Startup Delay t_{PRI_UVLO+_DELAY}ﬂoating, (i.e One time Startup delay from application

of V_{PRI_DC}to V_{SEC_DC}

20

ms

)

Secondary Output Overcurrent Trip

Threshold

I_{SEC_OUT_OCP}

t_{SEC_OUT_OCP}

t_OTP+

37.5

47

59

A

ms

°C

s

Secondary Output Overcurrent

Response Time Constant

Effective internal RC ﬁlter

3.6

Overtemperature Shutdown

Threshold

Temperature sensor located inside controller IC

125

Overtemperature Recovery

Threshold

t_OTP–

105

110

3

115

-45

Undertemperature Shutdown

Threshold

Temperature sensor located inside controller IC;

Protection not available for M-Grade units.

t_UTP

Startup into a persistent fault condition. Non-Latching

fault detection given V_{PRI_DC}> V_{PRI_UVLO+}

Undertemperature Restart Time

t_{UTP_RESTART}

BCM^®Bus Converter

Page 8 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Electrical Speciﬁcations (Cont.)

Speciﬁcations apply over all line and load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Attribute

Symbol

Conditions / Notes

Min

Typ

Max

51.3

Unit

General Powertrain SECONDARY to PRIMARY Speciﬁcation (Reverse Direction)

Secondary Input Voltage range,

continuous

V_{SEC_DC}

32.5

V

V_{SEC_DC}= 50V, T_INTERNAL= 25ºC

V_{SEC_DC}= 50V

12

17

22

6

SEC to PRI No Load Power

Dissipation

P_{SEC_NL}

W

V_{SEC_DC}= 32.5V to 51.3V, T_INTERNAL= 25ºC

V_{SEC_DC}= 32.5V to 51.3V

18

23

DC Secondary Input Current

I_{SEC_IN_DC}

At I_{PRI_DC}= 4.38A, T_INTERNAL≤ 100ºC

Speciﬁed at V_{SEC_DC}= 51.3V

36

A

Primary Output Power (continuous)

P_{PRI_OUT_DC}

1750

W

Speciﬁed at V_{SEC_DC}= 51.3V; 10ms pulse,

25% Duty cycle, P_{PRI_AVG}≤ 50 rated P_{PRI_OUT_DC}

Primary Output Power (pulsed)

Primary Output Current (continuous)

Primary Output Current (pulsed)

P_{PRI_OUT_PULSE}

I_{PRI_OUT_DC}

2000

4.38

5

W

A

10ms pulse, 25% Duty cycle,

I_{PRI_OUT_AVG}≤ 50% rated I_{PRI_OUT_DC}

I_{PRI_OUT_PULSE}

A

V_{SEC_DC}= 50V, I_{PRI_OUT_DC}= 4.38A

V_{SEC_DC}= 32.5V to 51.3V, I_{PRI_OUT_DC}= 4.38A

V_{SEC_DC}= 50V, I_{PRI_OUT_DC}= 2.2A

96.9

95.7

97.3

96.3

97.3

SEC to PRI Efﬁciency (ambient)

SEC to PRI Efﬁciency (hot)

η_AMB

%

97.8

96.8

η_HOT

η_20%

V_{SEC_DC}= 50V, I_{PRI_OUT_DC}= 4.38A

%

SEC to PRI Efﬁciency

(over load range)

0.88A < I_{PRI_OUT_DC}< 4.38A

92

R_{PRI_COLD}

R_{PRI_AMB}

R_{PRI_HOT}

V_{SEC_DC}= 50V, I_{PRI_OUT_DC}= 4.38A, T_INTERNAL= -40°C

V_{SEC_DC}= 50V, I_{PRI_OUT_DC}= 4.38A

1400

1650

2350

1628

2026

2683

2200

2650

3100

SEC to PRI Output Resistance

Primary Output Voltage Ripple

mΩ

V_{SEC_DC}= 50V, I_{PRI_OUT_DC}= 4.38A, T_INTERNAL= 100°C

C_{PRI_OUT_EXT}= 0µF, I_{PRI_OUT_DC}= 4.38A,

V_{SEC_DC}= 50V, 20MHz BW

2000

V_{PRI_OUT_PP}

mV

T_INTERNAL≤ 100ºC

2800

BCM^®Bus Converter

Page 9 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Electrical Speciﬁcations (Cont.)

Speciﬁcations apply over all line and load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Attribute

Symbol

Conditions / Notes

Min

Typ

Max

Unit

Protection SECONDARY to PRIMARY (Reverse Direction)

Secondary Overvoltage Lockout

Threshold

V_{SEC_OVLO+}

Module latched shutdown with V_{PRI_DC}< V_{PRI_UVLO-_R}

52.5

54.5

100

15

56.5

16

V

µs

V

Secondary Overvoltage Lockout

Response Time

t_{PRI_OVLO}

V_{SEC_UVLO-}

t_{SEC_UVLO}

Secondary Undervoltage Lockout

Threshold

Module latched shutdown with V_{PRI_DC}< V_{PRI_UVLO-_R}

13.75

Secondary Undervoltage Lockout

Response Time

100

µs

Applies only to reversilbe products in forward and in

reverse direction; I_{PRI_DC}≤ 20% while V_{PRI_UVLO-_R}

< V_{PRI_DC}< V_{PRI_MIN}

Primary Undervoltage Lockout

Threshold

V_{PRI_UVLO-_R}

110

120

130

150

V

Primary Undervoltage Recovery

Threshold

Applies only to reversilbe products in forward and in

reverse direction

V_{PRI_UVLO+_R}

V_{PRI_UVLO_HYST_R}

I_{PRI_OUT_OCP}

t_{PRI_OUT_OCP}

I_{PRI_SCP}

135

10

V

Primary Undervoltage Lockout

Hysteresis

Applies only to reversilbe products in forward and in

reverse direction

Primary Output Overcurrent Trip

Threshold

Module latched shutdown with V_{PRI_DC}< V_{PRI_UVLO-_R}

Effective internal RC ﬁlter

4.69

6.5

5.88

3.6

7.38

A

Primary Output Overcurrent

Response Time Constant

ms

A

Primary Short Circuit Protection Trip

Threshold

Module latched shutdown with V_{PRI_DC}< V_{PRI_UVLO-_R}

Primary Short Circuit Protection

Response Time

t_{PRI_SCP}

1

µs

BCM^®Bus Converter

Page 10 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

2000

1800

1600

1400

1200

1000

800

600

400

200

0

35

45

55

65

75

85

95

105

115

125

Case Temperature (°C)

Top only at temperture

Top and leads at temperature

Top, leads and belly at temperature

Figure 1 — Speciﬁed thermal operating area

42

40

38

36

34

32

30

28

26

24

22

20

18

16

2000

1900

1800

1700

1600

1500

1400

1300

1200

1100

1000

900

800

260 275 290 305 320 335 350 365 380 395 410

Primary Input Voltage (V)

P_{SEC_OUT_DC}

P_{SEC_OUT_PULSE}

I_{SEC_OUT_DC}

I_{SEC_OUT_PULSE}

Figure 2 — Speciﬁed electrical operating area using rated R_{SEC_HOT}

110

100

90

80

70

60

50

40

30

20

10

0

20

40

60

80

100

Seondary Output Current (% I_{SEC_DC}

)

Figure 3 — Speciﬁed Primary start-up into load current and external capacitance

BCM^®Bus Converter

Page 11 of 30

Rev 1.4

10/2017

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Analog Control Signal Characteristics

Speciﬁcations apply over all line and load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Temperature Monitor

• The TM pin is a standard analog I/O conﬁgured as an output from an internal µC.

• The TM pin monitors the internal temperature of the controller IC within an accuracy of 5°C.

• µC 250kHz PWM output internally pulled high to 3.3V.

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

TYP MAX UNIT

Powertrain active to TM

time

Startup

t_TM

100

µs

TM Duty Cycle

TM Current

TM_PWM

I_TM

18.18

68.18

4

%

mA

Recommended External ﬁltering

TM Capacitance (External)

TM Resistance (External)

C_{TM_EXT}

R_{TM_EXT}

Recommended External ﬁltering

0.01

1

µF

DIGITAL

OUTPUT

kΩ

Regular

Operation

Speciﬁcations using recommended ﬁlter

TM Gain

A_TM

10

mV / °C

V

TM Voltage Reference

V_{TM_AMB}

1.27

R_{TM_EXT}= 1kΩ, C_{TM_EXT}= 0.01µF,

V_{PRI_DC}= 400V, I_{SEC_DC}= 35A

28

TM Voltage Ripple

V_{TM_PP}

mV

T_INTERNAL≤ 100ºC

40

Enable / Disable Control

• The EN pin is a standard analog I/O conﬁgured as an input to an internal µC.

• It is internally pulled high to 3.3V.

• When held low the BCM internal bias will be disabled and the powertrain will be inactive.

• In an array of BCMs, EN pins should be interconnected to synchronize startup.

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

2.3

TYP MAX UNIT

V_{PRI_DC}> V_{PRI_UVLO+}, EN held low both

conditions satisﬁed for T > t_{PRI_UVLO+_DELAY}

EN to Powertrain

active time

Startup

t_{EN_START}

250

µs

ANALOG

INPUT

EN Voltage Threshold

EN Resistance (Internal)

EN Disable Threshold

V_{EN_TH}

R_{EN_INT}

V

kΩ

V

Regular

Operation

Internal pull up resistor

1.5

V_{EN_DISABLE_TH}

1

BCM^®Bus Converter

Page 12 of 30

Rev 1.4

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Analog Control Signal Characteristics (Cont.)

Speciﬁcations apply over all line and load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Auxiliary Voltage Source

• The VAUX pin is a standard analog I/O conﬁgured as an output from an internal µC.

• VAUX is internally connected to µC output as internally pulled high to a 3.3V regulator with 2% tolerance, a 1% resistor of 1.5kΩ.

• VAUX can be used as a “Ready to process full power” ﬂag. This pin transitions VAUX voltage after a 2ms delay from the start of powertrain activating,

signaling the end of softstart.

• VAUX can be used as “Fault ﬂag”. This pin is pulled low internally when a fault protection is detected.

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

2.8

TYP MAX UNIT

Powertrain active to

VAUX time

Startup

t_VAUX

Powertrain active to VAUX High

2

ms

VAUX Voltage

V_VAUX

I_VAUX

3.3

4

V

VAUX Available Current

mA

50

ANALOG

OUTPUT

Regular

Operation

VAUX Voltage Ripple

V_{VAUX_PP}

mV

µF

T_INTERNAL≤ 100ºC

100

VAUX Capacitance

(External)

C_{VAUX_EXT}

0.01

VAUX Resistance (External)

VAUX Fault Response Time

R_{VAUX_EXT}

t_{VAUX_FR}

V_{PRI_DC}< V_{µC_ACTIVE}

1.5

kΩ

Fault

From fault to V_VAUX= 2.8V, C_VAUX= 0pF

10

µs

BCM^®Bus Converter

Page 13 of 30

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PMBus™ Control Signal Characteristics

Speciﬁcations apply over all line, load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

UART SER-IN / SER-OUT Pins

• Universal Asynchronous Receiver/Transmitter (UART) pins.

• The BCM communication version is not intended to be used without a Digital Supervisor.

• Isolated I²C communication and telemetry is available when using Vicor Digital Isolator and Vicor Digital Supervisor. Please see speciﬁc product data sheet

for more details.

• UART SER-IN pin is internally pulled high using a 1.5kΩ to 3.3V.

SIGNAL TYPE

GENERAL I/O

STATE

ATTRIBUTE

Baud Rate

SYMBOL

CONDITIONS / NOTES

MIN

TYP

750

MAX UNIT

BR_UART

Rate

Kbit/s

SER-IN Pin

V_{SER-IN_IH}

V_{SER-IN_IL}

2.3

V

SER-IN Input Voltage Range

1

V

ns

kΩ

pF

DIGITAL

INPUT

SER-IN rise time

SER-IN fall time

SER-IN R_PULLUP

t_{SER-IN_RISE}10% to 90%

t_{SER-IN_FALL}10% to 90%

R_{SER-IN_PLP}Pull up to 3.3V

C_{SER-IN_EXT}

400

25

1.5

SER-IN External Capacitance

400

Regular

Operation

SER-OUT Pin

V_{SER-OUT_OH}0mA ≥ I_OH≥ -4mA

V_{SER-OUT_OL}0mA ≤ I_OL≤ 4mA

2.8

V

SER-OUT Output Voltage

Range

0.5

DIGITAL

OUTPUT

SER-OUT rise time

t_{SER-OUT_RISE}10% to 90%

t_{SER-OUT_FALL}10% to 90%

55

45

ns

SER-OUT fall time

SER-OUT source current

SER-OUT output impedance

I_SER-OUT

Z_SER-OUT

V_SER-OUT= 2.8V

6

mA

Ω

120

Enable / Disable Control

• The EN pin is a standard analog I/O conﬁgured as an input to an internal µC.

• It is internally pulled high to 3.3V.

• When held low the BCM internal bias will be disabled and the powertrain will be inactive.

• In an array of BCMs, EN pins should be interconnected to synchronize startup.

• Enable / disable command will have no effect if the EN pin is disabled.

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

2.3

TYP

250

MAX UNIT

V_{PRI_DC}> V_{PRI_UVLO+}

,

Startup

EN to Powertrain active time

t_{EN_START}

EN held low both conditions satisﬁed

for t > t_{PRI_UVLO+_DELAY}

µs

ANALOG

INPUT

EN Voltage Threshold

EN Resistance (Internal)

EN Disable Threshold

V_ENABLE

R_{EN_INT}

V

Regular

Operation

Internal pull up resistor

1.5

kΩ

V_{EN_DISABLE_TH}

1

V

BCM^®Bus Converter

Page 14 of 30

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PMBus™ Reported Characteristics

Speciﬁcations apply over all line, load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Monitored Telemetry

• The BCM communication version is not intended to be used without a Digital Supervisor.

DIGITAL SUPERVISOR

ACCURACY

(RATED RANGE)

FUNCTIONAL

REPORTING RANGE

UPDATE

RATE

ATTRIBUTE

REPORTED UNITS

PMBus^TMREAD COMMAND

Input voltage

(88h) READ_VIN

(89h) READ_IIN

5% (LL - HL)

130V to 450V

-5.9A to 5.9A

100µs

100ms

V_ACTUAL= V_REPORTEDx 10^-1

I_ACTUAL= I_REPORTEDx 10^-3

V_ACTUAL= V_REPORTEDx 10^-1

I_ACTUAL= I_REPORTEDx 10^-2

R_ACTUAL= R_REPORTEDx 10^-5

T_ACTUAL= T_REPORTED

20% (10 - 20% of FL)

5% (20 - 133% of FL)

Input current

Output voltage^[1]

Output current

Output resistance

Temperature^[2]

(8Bh) READ_VOUT

5% (LL - HL)

16.25V to 56.25V

-47.5A to 47.5A

10mΩ to 40mΩ

- 55ºC to 130ºC

20% (10 - 20% of FL)

5% (20 - 133% of FL)

(8Ch) READ_IOUT

5% (50 - 100% of FL) at NL

10% (50 - 100% of FL) (LL - HL)

(D4h) READ_ROUT

(8Dh) READ_TEMPERATURE_1

7°C (Full Range)

^[1]Default READ Output Voltage returned when unit is disabled = -300 V.

^[2]Default READ Temperature returned when unit is disabled = -273°C.

Variable Parameter

• Factory setting of all below Thresholds and Warning limits are 100% of listed protection values.

• Variables can be written only when module is disabled either EN pulled low or V_IN< V_{IN_UVLO-}

.

• Module must remain in a disabled mode for 3ms after any changes to the below variables allowing ample time to commit changes to EEPROM.

FUNCTIONAL

REPORTING

RANGE

DIGITAL SUPERVISOR

ACCURACY

(RATED RANGE)

DEFAULT

VALUE

ATTRIBUTE

CONDITIONS / NOTES

PMBus^TMCOMMAND ^[3]

Input / Output Overvoltage

Protection Limit

V_{IN_OVLO-}is automatically 3%

lower than this set point

(55h) VIN_OV_FAULT_LIMIT

(57h) VIN_OV_WARN_LIMIT

(D7h) DISABLE_FAULTS

(5Bh) IIN_OC_FAULT_LIMIT

(5Dh) IIN_OC_WARN_LIMIT

(4Fh) OT_FAULT_LIMIT

5% (LL - HL)

130V to 435V

130V or 260V

0 to 5.625A

0 to 125°C

100%

0ms

Input / Output Overvoltage

Warning Limit

Input / Output Undervoltage

Protection Limit

Can only be disabled to a preset

default value

Input Overcurrent Protec-

tion Limit

20% (10 - 20% of FL)

5% (20 - 133% of FL)

Input Overcurrent

Warning Limit

20% (10 - 20% of FL)

5% (20 - 133% of FL)

Overtemperature Protection

Limit

7°C (Full Range)

50µs

Overtemperature

Warning Limit

(51h) OT_WARN_LIMIT

(60h) TON_DELAY

0 to 125°C

Additional time delay to the

Undervoltage Startup Delay

Turn on Delay

0 to 100ms

^[3]Refer to Digital Supervisor datasheet for complete list of supported commands.

BCM^®Bus Converter

Page 15 of 30

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BCM Module Timing Diagram

BCM^®Bus Converter

Page 16 of 30

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High Level Functional State Diagram

Application

of input voltage to V_{PRI_DC}

V_{µC_ACTIVE}< V_{PRI_DC}< V_{PRI_UVLO+}

STARTUP SEQUENCE

TM Low

V_{PRI_DC}> V_{PRI_UVLO+}

STANDBY SEQUENCE

TM Low

EN High

VAUX Low

Powertrain Stopped

ENABLE falling edge,

or OTP detected

t_{PRI_UVLO+_DELAY}

expired

Input OVLO or UVLO,

Output OCP,

ONE TIME DELAY

Fault

Auto-

recovery

INITIAL STARTUP

or UTP detected

ENABLE falling edge,

or OTP detected

FAULT

SEQUENCE

TM Low

SUSTAINED

OPERATION

TM PWM

Input OVLO or UVLO,

Output OCP,

EN High

or UTP detected

VAUX Low

VAUX High

Powertrain Stopped

Powertrain Active

Short Circuit detected

BCM^®Bus Converter

Page 17 of 30

Rev 1.4

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Application Characteristics

Product is mounted and temperature controlled via top side cold plate, unless otherwise noted. All data presented in this section are collected data from

primary sourced units processing power in forward direction.See associated ﬁgures for general trend data.

17

16

15

14

13

12

11

10

9

98.0

97.8

97.5

97.3

97.0

96.8

96.5

96.3

96.0

95.8

95.5

8

7

6

5

4

3

-40

-20

0

20

40

60

80

100

260 275 290 305 320 335 350 365 380 395 410

Primary Input Voltage (V)

Case Temperature (ºC)

T_{TOP SURFACE CASE}

:

-40°C

25°C

80°C

V_PRI:

260V

400V

410V

Figure 4 — No load power dissipation vs. V_{PRI_DC}

Figure 5 — Full load efﬁciency vs. temperature; V_{PRI_DC}

99

98

97

96

95

94

93

92

91

90

89

88

80

72

64

56

48

40

32

24

16

8

0

0.0 3.5 7.0 10.5 14.0 17.5 21.0 24.5 28.0 31.5 35.0

Secondary Output Current (A)

V_PRI

:

260V

400V

410V

V_PRI

:

260V

400V

410V

Figure 6 — Efﬁciency at T_CASE= -40°C

Figure 7 — Power dissipation at T_CASE= -40°C

99

98

97

96

95

94

93

92

91

90

72

64

56

48

40

32

24

16

8

0

0.0 3.5 7.0 10.5 14.0 17.5 21.0 24.5 28.0 31.5 35.0

Load Current (A)

260V

400V

410V

V_PRI

:

260V

400V

410V

V_PRI

:

Figure 8 — Efﬁciency at T_CASE= 25°C

Figure 9 — Power dissipation at T_CASE= 25°C

BCM^®Bus Converter

Page 18 of 30

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72

64

56

48

40

32

24

16

8

99

98

97

96

95

94

93

92

91

90

0

0.0 3.5 7.0 10.5 14.0 17.5 21.0 24.5 28.0 31.5 35.0

Secondary Output Current (A)

V_PRI

:

260V

400V

410V

V_PRI

:

260V

400V

410V

Figure 10 — Efﬁciency at T_CASE= 80°C

Figure 11 — Power dissipation at T_CASE= 80°C

50

40

30

20

10

0

300

250

200

150

100

50

0

-40

-20

0

20

40

60

80

100

0.0 3.5 7.0 10.5 14.0 17.5 21.0 24.5 28.0 31.5 35.0

Case Temperature (°C)

Secondary Output Current (A)

V_PRI

:

400V

I_{SEC_OUT}

:

35A

Figure 12 — R_SECvs. temperature; Nominal V_{PRI_DC}

Figure 13 — V_{SEC_OUT_PP}vs. I_{SEC_DC}; No external C_{SEC_OUT_EXT}

.

I_{SEC_DC}= 24A at T_CASE= 80°C

Board mounted module, scope setting:

20MHz analog BW

Figure 14 — Full load ripple, 270µF C_{PRI_IN_EXT}; No external

C_{SEC_OUT_EXT}Board mounted module, scope setting:

.

20MHz analog BW

BCM^®Bus Converter

Page 19 of 30

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Figure 15 — 0A – 35A transient response:

C_{PRI_IN_EXT}= 270µF, no external C_{SEC_OUT_EXT}

Figure 16 — 35A – 0A transient response:

C_{PRI_IN_EXT}= 270µF, no external C_{SEC_OUT_EXT}

Figure 17 — Start up from application of V_{PRI_DC}= 400V,

Figure 18 — Start up from application of EN with pre-applied

50% I_{SEC_DC}, 100% C_{SEC_OUT_EXT}

V_{PRI_DC}= 400V, 50% I_{SEC_DC}, 100% C_{SEC_OUT_EXT}

BCM^®Bus Converter

Page 20 of 30

Rev 1.4

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General Characteristics

Speciﬁcations apply over all line and load conditions, unless otherwise noted; boldface speciﬁcations apply over the temperature range of

-40°C ≤ T_INTERNAL≤ 125°C (T-Grade). All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Attribute

Symbol

Conditions / Notes

Mechanical

Min

Typ

Max

Unit

Length

Width

L

W

H

62.96 / [2.479] 63.34 / [2.494] 63.72 / [2.509] mm/[in]

22.67 / [0.893] 22.80 / [0.898] 22.93 / [0.903] mm/[in]

Height

Volume

Weight

7.11 / [0.280] 7.21 / [0.284] 7.31 / [0.288]

mm/[in]

cm³/[in³]

g/[oz]

Vol

W

Without Heatsink

10.41 / [0.636]

41 / [1.45]

Nickel

0.51

0.02

2.03

0.15

Lead Finish

Palladium

Gold

µm

0.003

0.051

Thermal

BCM6123xD1E5135yzz (T-Grade)

BCM6123xD1E5135yzz (M-Grade)

-40

-55

125

°C

Operating Temperature

T_INTERNAL

Estimated thermal resistance to maximum

temperature internal component from

isothermal top

Thermal Resistance Top Side

Thermal Resistance Leads

θ_INT-TOP

1.33

5.64

°C/W

Estimated thermal resistance to

θ_INT-LEADSmaximum temperature internal

component from isothermal leads

Estimated thermal resistance to

θ_INT-BOTTOMmaximum temperature internal

component from isothermal bottom

Thermal Resistance Bottom Side

Thermal Capacity

1.29

34

°C/W

Ws/°C

Assembly

BCM6123xD1E5135yzz (T-Grade)

-55

-65

125

°C

Storage Temperature

ESD Withstand

BCM6123xD1E5135yzz (M-Grade)

ESD_HBM

ESD_CDM

Human Body Model, “ESDA / JEDEC JDS-001-2012” Class I-C (1kV to < 2kV)

Charge Device Model, “JESD 22-C101-E” Class II (200V to < 500V)

BCM^®Bus Converter

Page 21 of 30

Rev 1.4

10/2017

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General Characteristics (Cont.)

Speciﬁcations apply over all line and load conditions, unless otherwise noted; Boldface speciﬁcations apply over the temperature range of -40°C ≤ T_INTERNAL

≤ 125°C (T-Grade); All other speciﬁcations are at T_INTERNAL= 25ºC unless otherwise noted.

Attribute

Symbol

Conditions / Notes

Soldering^[1]

Min

Typ

Max

Unit

Peak Temperature Top Case

135

°C

Safety

PRIMARY to SECONDARY

4,242

2,121

620

Isolation voltage / Dielectric test

V_HIPOT

PRIMARY to CASE

SECONDARY to CASE

Unpowered Unit

At 500V_DC

V_DC

Isolation Capacitance

Insulation Resistance

C_{PRI_SEC}

R_{PRI_SEC}

780

940

pF

10

MΩ

MIL-HDBK-217Plus Parts Count - 25°C

Ground Benign, Stationary, Indoors /

Computer

3.53

3.90

MHrs

MTBF

Telcordia Issue 2 - Method I Case III; 25°C

Ground Benign, Controlled

cTUVus EN 60950-1

cURus UL 60950-1

Agency Approvals / Standards

CE Marked for Low Voltage Directive and RoHS Recast Directive, as applicable

Previous Part Numbers

BCM400x500y1K8A3z

BCM400x500y1K8A31

^[1]Product is not intended for reﬂow solder attach.

BCM^®Bus Converter

Page 22 of 30

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PMBus™ System Diagram

-OUT

BCM

EN Control

3.3V, at least 20mA

when using 4xDISO

SCL

Ref to Digital Isolator

datasheet for more details

Digital Isolator

3 kΩ

VDD

3 kΩ

BCM EN

5V EXT

VDDB

SEC-IN-A

SEC-IN-B

PRI-OUT-A

PRI-OUT-B

PRI-IN-C

SER-IN

SER-OUT

-IN BCM

TXD1’

RXD1

RXD4

RXD3

RXD2

RXD1

TXD4

TXD3

SEC-OUT-C

VDD

NC

CP

D

VCC

PRI-COM

SEC-COM

SD

RD

Q

D

D44TL1A0 ^NC

Q

NC

SSTOP

Flip-flop

VDD

Host

µc

SGND

SDA

SCL

74LVC1G74DC

10 kΩ

PMBus

FDG6318P

R1

R2

10 kΩ

SGND

The PMBus communication enabled bus converter provides accurate telemetry monitoring and reporting, threshold and warning

limits adjustment, in addition to corresponding status ﬂags.

The BCM internal µC is referenced to primary ground. The Digital Isolator allows UART communication interface with the host Digital

Supervisor at typical speed of 750kHz across the isolation barrier. One of the advantages of the Digital Isolator is its low power

consumption. Each transmission channel is able to draw its internal bias circuitry directly from the input signal being transmitted to

the output with minimal to no signal distortion.

The Digital Supervisor provides the host system µC with access to an array of up to 4 BCMs. This array is constantly polled for status

by the Digital Supervisor. Direct communication to individual BCM is enabled by a page command. For example, the page (0x00)

prior to a telemetry inquiry points to the Digital Supervisor data and pages (0x01 – 0x04) prior to a telemetry inquiry points to the

array of BCMs connected data. The Digital Supervisor constantly polls the BCM data through the UART interface.

The Digital Supervisor enables the PMBus compatible host interface with an operating bus speed of up to 400kHz. The Digital

Supervisor follows the PMBus command structure and speciﬁcation.

Please refer to the Digital Supervisor data sheet for more details.

BCM^®Bus Converter

Page 23 of 30

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Sine Amplitude Converter™ Point of Load Conversion

R_SEC

1.77nH

24.2mΩ

= 1.3nH

I_O^I^S_U^EC_T

R_OUT

l_{SEC_OUT_LEADS}

= 6.7nH

l_{PRI_IN_LEADS}

+

C_{PRI_INT_ESR}

21.5mΩ

R

C_{SEC_INT_ESR}

510µΩ

C_OUT

R

139mΩ

C_IN

V•I

K

1/8 • I_SEC

1/8 • V_PRI

C_{PRI_INT}

0.37µF

C_{SEC_INT}

25.6µF

+

–

+

–

C_IN

C_OUT

V_SEC

V_OUT

V

I

V

PRI

_PRII^__Q^Q

IN

25.8mA

L_{PRI_INT}= 0.56µH

–

Figure 19 — BCM module AC model

The Sine Amplitude Converter (SAC™) uses a high frequency

resonant tank to move energy from Primary to secondary and

vice versa. The resonant LC tank, operated at high frequency,

is amplitude modulated as a function of primary voltage and

secondary current. A small amount of capacitance embedded in

Eq. (3) now becomes Eq. (1) and is essentially load independent,

resistor R is now placed in series with V_PRI

.

the primary and secondary stages of the module is sufﬁcient for full

functionality and is key to achieving high power density.

R

SAC™

K = 1/8

K = 1/32

SAC

Vout

V_SEC

+

–

The BCM6123xD1E5135yzz SAC can be simpliﬁed into the

preceeding model.

Vin

V_PRI

At no load:

(1)

V_SEC= V_PRI• K

Figure 20 — K = 1/8 Sine Amplitude Converter

with series primary resistor

K represents the “turns ratio” of the SAC.

Rearranging Eq (1):

The relationship between V_PRIand V_SECbecomes:

V_SEC

(2)

K =

V_PRI

V_SEC= V_PRI– I_PRI• R • K

(5)

(

)

In the presence of load, V_SECis represented by:

Substituting the simpliﬁed version of Eq. (4)

(I_{PRI_Q}is assumed = 0A) into Eq. (5) yields:

(3)

V_SEC= V_PRI• K – I_SEC• R_SEC

and I_SECis represented by:

I_PRI– I_{PRI_Q}

2

(6)

V_SEC= V_PRI• K – I_SEC• R • K

This is similar in form to Eq. (3), where R_SECis used to represent the

characteristic impedance of the SAC™. However, in this case a real

R on the primary side of the SAC is effectively scaled by K²with

respect to the secondary.

(4)

I_SEC

=

K

R_SECrepresents the impedance of the SAC, and is a function of

the R_DSONof the primary and secondary MOSFETs and the winding

resistance of the power transformer. I_{PRI_Q}represents the quiescent

current of the SAC control, gate drive circuitry, and core losses.

Assuming that R = 1Ω, the effective R as seen from the secondary

side is 16mΩ, with K = 1/8.

The use of DC voltage transformation provides additional

interesting attributes. Assuming that R_SEC= 0Ω and I_{PRI_Q}= 0A,

BCM^®Bus Converter

Page 24 of 30

Rev 1.4

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BCM6123xD1E5135yzz

A similar exercise should be performed with the additon of

a capacitor or shunt impedance at the primary input to the

SAC. A switch in series with V_PRIis added to the circuit. This is

depicted in Figure 21.

Low impedance is a key requirement for powering a high-

current, low-voltage load efﬁciently. A switching regulation stage

should have minimal impedance while simultaneously providing

appropriate ﬁltering for any switched current. The use of a SAC

between the regulation stage and the point of load provides a

dual beneﬁt of scaling down series impedance leading back to

the source and scaling up shunt capacitance or energy storage

as a function of its K factor squared. However, the beneﬁts are

not useful if the series impedance of the SAC is too high. The

impedance of the SAC must be low, i.e. well beyond the crossover

frequency of the system.

S

SAC™

SAC

V_SEC

Vout

+

–

K = 1/8

C

K = 1/32

VVin

PRI

A solution for keeping the impedance of the SAC low involves

switching at a high frequency. This enables small magnetic

components because magnetizing currents remain low. Small

magnetics mean small path lengths for turns. Use of low loss core

material at high frequencies also reduces core losses.

Figure 21 — Sine Amplitude Converter with primary capacitor

The two main terms of power loss in the BCM module are:

A change in V_PRIwith the switch closed would result in a change in

capacitor current according to the following equation:

n■No load power dissipation (P_{PRI_NL}): deﬁned as the power

used to power up the module with an enabled powertrain

at no load.

dV_PRI

(7)

I_C(t) = C

n■Resistive loss (P_RSEC): refers to the power loss across

dt

the BCM module modeled as pure resistive impedance.

Assume that with the capacitor charged to V_PRI, the switch is

opened and the capacitor is discharged through the idealized

SAC. In this case,

(10)

P_DISSIPATED= P_{PRI_NL}+ P_R

SEC

Therefore,

(8)

I_C= I_SEC• K

(11)

P_{SEC_OUT}= P_{PRI_IN}– P_DISSIPATED= P_{PRI_IN}– P_{PRI_NL}– P_R

SEC

substituting Eq. (1) and (8) into Eq. (7) reveals:

The above relations can be combined to calculate the overall

module efﬁciency:

C

dV_SEC

dt

I_SEC(t) =

(9)

•

K²

P_{SEC_OUT}

P_{PRI_IN}

P_{PRI_IN}– P_{PRI_NL}– P_R

P_{PRI_IN}

SEC

(12)

η =

=

The equation in terms of the output has yielded a K²scaling factor

for C, speciﬁed in the denominator of the equation.

A K factor less than unity results in an effectively larger capacitance

on the secondary when expressed in terms of the primary. With a

K = 1/8 as shown in Figure 21, C = 1µF would appear as

2

V_PRI• I_PRI– P_{PRI_NL}– I

• R_SEC

(

)

SEC

=

C = 64µF when viewed from the secondary.

V_PRI• I_PRI

2

P_{PRI_NL}+ I

• R_SEC

(

)

SEC

1 –

( )

V_PRI• I_PRI

BCM^®Bus Converter

Page 25 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Input and Output Filter Design

Thermal Considerations

The ChiP package provides a high degree of ﬂexibility in that it

presents three pathways to remove heat from internal power

dissipating components. Heat may be removed from the top

surface, the bottom surface and the leads. The extent to which

these three surfaces are cooled is a key component for determining

the maximum current that is available from a ChiP, as can be

seen from Figure 1.

A major advantage of SAC™ systems versus conventional PWM

converters is that the transformer based SAC does not require

external ﬁltering to function properly. The resonant LC tank,

operated at extreme high frequency, is amplitude modulated as a

function of primary voltage and secondary current and efﬁciently

transfers charge through the isolation transformer. A small amount

of capacitance embedded in the primary and secondary stages

of the module is sufﬁcient for full functionality and is key to

achieving power density.

Since the ChiP has a maximum internal temperature rating, it is

necessary to estimate this internal temperature based on a real

thermal solution. Given that there are three pathways to remove

heat from the ChiP, it is helpful to simplify the thermal solution into

a roughly equivalent circuit where power dissipation is modeled as

a current source, isothermal surface temperatures are represented

as voltage sources and the thermal resistances are represented as

resistors. Figure 22 shows the “thermal circuit” for a 6123 BCM in

an application where the top, bottom, and leads are cooled. In this

case, the BCM power dissipation is PD_TOTALand the three surface

This paradigm shift requires system design to carefully evaluate

external ﬁlters in order to:

n■Guarantee low source impedance:

To take full advantage of the BCM module’s dynamic response,

the impedance presented to its primary terminals must be low

from DC to approximately 5MHz. The connection of the bus

converter module to its power source should be implemented

with minimal distribution inductance. If the interconnect

inductance exceeds 100nH, the input should be bypassed with a

RC damper to retain low source impedance and stable operation.

With an interconnect inductance of 200nH, the RC damper

may be as high as 1µF in series with 0.3Ω. A single electrolytic

or equivalent low-Q capacitor may be used in place of the

series RC bypass.

temperatures are represented as T_{CASE_TOP}

,

T_{CASE_BOTTOM}, and T_LEADS. This thermal system can now be very

easily analyzed using a SPICE simulator with simple resistors,

voltage sources, and a current source. The results of the simulation

would provide an estimate of heat ﬂow through the various

pathways as well as internal temperature.

n■Further reduce primary and/or secondary voltage ripple without

Thermal Resistance Top

MAX INTERNAL TEMP

θ_INT-TOP

sacriﬁcing dynamic response:

Thermal Resistance Bottom

Given the wide bandwidth of the module, the source response

is generally the limiting factor in the overall system response.

Anomalies in the response of the primary source will appear at

the secondary of the module multiplied by its K factor.

Thermal Resistance Leads

θ_INT-BOTTOM

θ_INT-LEADS

+

–

+

–

+

–

T

_{CASE_BOTTOM}(°C)

T_LEADS(°C)

T_{CASE_TOP}(°C)

Power Dissipation (W)

n■Protect the module from overvoltage transients imposed by the

system that would exceed maximum ratings and induce stresses:

Figure 22 — Top case, Bottom case and leads thermal model

The module primary/secondary voltage ranges shall not be

exceeded. An internal overvoltage lockout function prevents

operation outside of the normal operating primary range. Even

when disabled, the powertrain is exposed to the applied voltage

and power MOSFETs must withstand it.

Alternatively, equations can be written around this circuit and

analyzed algebraically:

T_INT– PD₁• θ_INT-TOP= T_{CASE_TOP}

T_INT– PD₂• θ_INT-BOTTOM= T_{CASE_BOTTOM}

T_INT– PD₃• θ_INT-LEADS= T_LEADS

PD_TOTAL= PD₁+ PD₂+ PD₃

Total load capacitance at the secondary of the BCM module shall

not exceed the speciﬁed maximum. Owing to the wide bandwidth

and low secondary impedance of the module, low-frequency

bypass capacitance and signiﬁcant energy storage may be more

densely and efﬁciently provided by adding capacitance at the

primary of the module. At frequencies <500kHz the module

appears as an impedance of R_SECbetween the source and load.

Where T_INTrepresents the internal temperature and PD₁, PD₂, and

PD₃represent the heat ﬂow through the top side, bottom side, and

leads respectively.

Within this frequency range, capacitance at the primary appears as

effective capacitance on the secondary per the relationship

deﬁned in Eq. (13).

Thermal Resistance Top

MAX INTERNAL TEMP

C_{PRI_EXT}

θ_INT-TOP

(13)

C_{SEC_EXT}

=

K²

Thermal Resistance Bottom

Thermal Resistance Leads

θ_INT-BOTTOM

θ_INT-LEADS

This enables a reduction in the size and number of capacitors used

in a typical system.

+

–

+

–

T_{CASE_BOTTOM}(°C)

T_LEADS(°C)

T_{CASE_TOP}(°C)

Power Dissipation (W)

Figure 23 — Top case and leads thermal model

BCM^®Bus Converter

Page 26 of 30

Rev 1.4

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BCM6123xD1E5135yzz

Figure 23 shows a scenario where there is no bottom side cooling.

In this case, the heat ﬂow path to the bottom is left open and the

equations now simplify to:

Z_{IN_EQ1}

Z_{OUT_EQ1}

BCM^®1

R_{0_1}

V_PRI

V_SEC

T_INT– PD₁• θ_INT-TOP= T_{CASE_TOP}

T_INT– PD₃• θ_INT-LEADS= T_LEADS

PD_TOTAL= PD₁+ PD₃

Z_{OUT_EQ2}

Z_{IN_EQ2}

BCM^®2

R_{0_2}

+

Load

DC

Thermal Resistance Top

MAX INTERNAL TEMP

θ_INT-TOP

Thermal Resistance Bottom

Thermal Resistance Leads

θ_INT-BOTTOM

θ_INT-LEADS

Z_{OUT_EQn}

BCM^®n

R_{0_n}

Z_{IN_EQn}

+

–

T

_{CASE_BOTTOM}(°C)

T_LEADS(°C)

T_{CASE_TOP}(°C)

Power Dissipation (W)

Figure 24 — Top case thermal model

Figure 24 shows a scenario where there is no bottom side and

leads cooling. In this case, the heat ﬂow paths to the bottom and

leads are left open and the equations now simplify to:

Figure 25 — BCM module array

Fuse Selection

In order to provide ﬂexibility in conﬁguring power systems

ChiP modules are not internally fused. Input line fusing

of ChiP products is recommended at system level to provide

thermal protection in case of catastrophic failure.

T_INT– PD₁• θ_INT-TOP= T_{CASE_TOP}

PD_TOTAL= PD₁

The fuse shall be selected by closely matching system

requirements with the following characteristics:

Please note that Vicor has a suite of online tools, including a

simulator and thermal estimator which greatly simplify the task of

determining whether or not a BCM thermal conﬁguration is valid

for a given condition. These tools can be found at:

n■Current rating

(usually greater than maximum current of BCM module)

http://www.vicorpower.com/powerbench..

n■Maximum voltage rating

(usually greater than the maximum possible input voltage)

Current Sharing

n■Ambient temperature

The performance of the SAC™ topology is based on efﬁcient

transfer of energy through a transformer without the need of

closed loop control. For this reason, the transfer characteristic

can be approximated by an ideal transformer with a positive

temperature coefﬁcient series resistance.

n■Nominal melting I²t

n■Recommend fuse: See safety agency approvals.

Reverse Operation

This type of characteristic is close to the impedance characteristic

of a DC power distribution system both in dynamic (AC) behavior

and for steady state (DC) operation.

BCM modules are capable of reverse power operation. Once the

unit is started, energy will be transferred from the secondary back

to the primary whenever the secondary voltage exceeds V_PRI• K.

The module will continue operation in this fashion for as long as

no faults occur.

When multiple BCM modules of a given part number are

connected in an array they will inherently share the load current

according to the equivalent impedance divider that the system

implements from the power source to the point of load.

Transient operation in reverse is expected in cases where there is

signiﬁcant energy storage on the output and transient voltages

appear on the input.

Some general recommendations to achieve matched array

impedances include:

The BCM6123xD1E5135y0R and BCM6123xD1E5135y0P are both

qualiﬁed for continuous operation in reverse power condition. A

primary voltage of V_{PRI_DC}> V_{PRI_UVLO+_R}must be applied ﬁrst to

allow the primary reference controller and power train to start.

Continuous operation in reverse is then possible after a

successful startup.

n■Dedicate common copper planes within the PCB to deliver and

return the current to the modules.

n■Provide as symmetric a PCB layout as possible among modules

n■An input ﬁlter is required for an array of BCMs in order to pre-

vent circulating currents.

For further details see AN:016 Using BCM Bus Converters

in High Power Arrays.

BCM^®Bus Converter

Page 27 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

BCM Module Through Hole Package Mechanical Drawing and Recommended Land Pattern

63.34 .38

2.494 .ꢀ01

00.43

.41ꢀ

30.67

0.247

0.12

.ꢀ6ꢀ

(2) PL.

00.4ꢀ

.449

ꢀ

22.8ꢀ .03

.898 .ꢀꢀ1

0.12

.ꢀ6ꢀ

(4) PL.

0.ꢀ2

.ꢀ4ꢀ

(3) PL.

TOP VIEW (COMPONENT SIDE)

.05 [.002]

7.21 .10

.284 .004

SEATING

.

PLANE

.41

.016

4.17

.164

(9) PL.

8.21

.321

8.ꢀꢀ

.301

2.71

.0ꢀ8

0.38

.ꢀ14

ꢀ

0

0.38

.ꢀ14

2.71

.0ꢀ8

4.03

.062

8.ꢀꢀ

.301

8.21

.321

BOTTOM VIEW

1.52

.060

PLATED THRU

.25 [.010]

ANNULAR RING

(3) PL.

8.25 .08

.325 .003

8.00 .08

.315 .003

+VPRI

+VSEC

-VSEC

+VSEC

2.75 .08

.108 .003

1.38 .08

.054 .003

TM / SER-OUT

EN

0

1.38 .08

.054 .003

0

2.75 .08

.108 .003

4.13 .08

VAUX / SER-IN

.162 .003

8.00 .08

.315 .003

8.25 .08

.325 .003

-VPRI

-VSEC

2.03

.080

2.03

.080

PLATED THRU

.25 [.010]

ANNULAR RING

(2) PL.

PLATED THRU

.38 [.015]

ANNULAR RING

(4) PL.

RECOMMENDED HOLE PATTERN

(COMPONENT SIDE)

NOTES:

1- RoHS COMPLIANT PER CST-0001 LATEST REVISION.

2- UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE MM / [INCH]

BCM^®Bus Converter

Page 28 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Revision History

Revision

1.0

Date

Description

Release of current data sheet with new part number

Updated the output resistance in the reverse direction

Updated height speciﬁcation

Page Number(s)

08/4/16

01/16/17

08/04/17

09/15/17

10/10/17

n/a

1.1

9

1.2

1, 21, 28

1.3

Updated volume speciﬁcation

21

9

1.4

Updated secondary to primary output resistance

BCM^®Bus Converter

Page 29 of 30

Rev 1.4

10/2017

BCM6123xD1E5135yzz

Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and

accessory components, fully conﬁgurable AC-DC and DC-DC power supplies, and complete custom

power systems.

Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. Vicor

makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication. Vicor reserves

the right to make changes to any products, speciﬁcations, and product descriptions at any time without notice. Information published by

Vicor has been checked and is believed to be accurate at the time it was printed; however, Vicor assumes no responsibility for inaccuracies.

Testing and other quality controls are used to the extent Vicor deems necessary to support Vicor’s product warranty. Except where

mandated by government requirements, testing of all parameters of each product is not necessarily performed.

Speciﬁcations are subject to change without notice.

Visit http://www.vicorpower.com/dc-dc/isolated-ﬁxed-ratio/hv-bus-converter-module for the latest product information.

Vicor’s Standard Terms and Conditions and Product Warranty

All sales are subject to Vicor’s Standard Terms and Conditions of Sale, and Product Warranty which are available on Vicor’s webpage

(http://www.vicorpower.com/termsconditionswarranty) or upon request.

Life Support Policy

VICOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE

EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF VICOR CORPORATION. As used

herein, life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and

whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to

result in a signiﬁcant injury to the user. A critical component is any component in a life support device or system whose failure to perform

can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. Per Vicor Terms

and Conditions of Sale, the user of Vicor products and components in life support applications assumes all risks of such use and indemniﬁes

Vicor against all liability and damages.

Intellectual Property Notice

Vicor and its subsidiaries own Intellectual Property (including issued U.S. and Foreign Patents and pending patent applications) relating to the

products described in this data sheet. No license, whether express, implied, or arising by estoppel or otherwise, to any intellectual property

rights is granted by this document. Interested parties should contact Vicor’s Intellectual Property Department.

The products described on this data sheet are protected by the following U.S. Patents Numbers:

6,911,848; 6,930,893; 6,934,166; 7,145,786; 7,782,639; 8,427,269 and for use under 6,975,098 and 6,984,965.

Contact Us: http://www.vicorpower.com/contact-us

Vicor Corporation

25 Frontage Road

Andover, MA, USA 01810

Tel: 800-735-6200

Fax: 978-475-6715

www.vicorpower.com

email

Customer Service: custserv@vicorpower.com

Technical Support: apps@vicorpower.com

All other trademarks, product names, logos and brands are property of their respective owners.

BCM^®Bus Converter

Page 30 of 30

Rev 1.4

10/2017


型号：	BCM6123XD1E5135YZZ_17
厂家：	VICOR CORPORATION
描述：	Isolated Fixed-Ratio DC-DC Converter
文件：	总30页 (文件大小：799K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BCM6123XD1E5135YZZ_17 [VICOR]

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