PT4661C_技术文档

PT4660 Series

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

Features

• Dual 15-A Outputs

• Dual Logic On/Off Control

• Over-Temperature Shutdown

• Over-Voltage Protection

(Coordinated Shutdown)

• Under-Voltage Lockout

• Input Differential EMI Filter

• IPC Lead Free 2

• Safety Approvals:

UL1950

(Independantly Regulated)

• Power-up/Down Sequencing

• Input Voltage Range:

36 V to 75 V

• 1500 VDC Isolation

• Temp Range: –40 to 100 °C

• High Efficiency: 88 %

• Fixed Frequency Operation

• Over-Current Protection

(Both Outputs)

CSA 22.2 950

Description

Ordering Information

protection, and an input under-voltage

lockout (UVLO). In addition, both

output voltages are designed to meet

the power-up/power-down sequenc-

ing requirements of popular DSPs.

The PT4660 series is housed in

space-saving solderable copper case.

The package does not require a

heatsink and is available in both

vertical and horizontal configura-

tions, including surface mount. The

‘N’ configuration occupies less than 2

in² of PCB area.

Pt. No.

Vo₁/Vo₂

The PT4660 Excalibur™ Series

is a 30-A rated, dual-output isolated

DC/DC converter that combines

state-of-the-art power conversion

technology with unparalleled flex-

ibility. These modules operate from

a standard telecom (–48 V) central

office (CO) supply to produce two

independantly regulated outputs.

The PT4660 series is characterized

with high efficiencies and ultra-fast

transient response, and incorporates

many features to facilitate system

integration. These include a flexible

“On/Off” enable control, output

current limit, over-temperature

PT4661o

PT4662o

PT4663o

PT4665o

PT4666o

PT4667o

PT4668o

= 5.0/3.3 Volts

= 3.3/2.5 Volts

= 3.3/1.8 Volts

= 3.3/1.5 Volts

= 2.5/1.8 Volts

= 5.0/1.8 Volts

= 3.3/1.2 Volts

PT Series Suffix

(PT1234x)

Case/Pin

Order

Package

Configuration

Suffix

Code

Vertical

Horizontal

SMD

N

A

C

(EKD)

(EKA)

(EKC)

(Reference the applicable package code draw-

ing for the dimensions and PC board layout)

Typical Application

V₁Adjust

V₂Adjust

20

13

Vo ₂adj

Vo₁adj

Vo ₁

Vo ₂

+V_IN

9–12

Vo₁

1

3

+Vin

21–24

Vo₂

PT4660

L

O

A

D

L

O

A

D

EN 1*

4

EN

2

–V _IN

C O M

2

14–19

–Vin

COM

* Inverted logic

For technical support and further information, visit http://power.ti.com

PT4660 Series

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

Pin-Out Information

Pin Function

On/Off Logic

Pin 3 Pin 4

Output Status

Function

1

2

3

4

5

6

7

8

9

+V

-V

10

+Vo₁

in

19

COM

1

0

×

1

0

Off

On

Off

11

12

13

14

15

16

17

18

+Vo₁

in

20

21

22

23

24

25

26

Vo₂Adjust

+Vo₂

EN 1

+Vo₁

EN 2

Vo₁Adjust

COM

+Vo₂

TEMP

+Vo₂

Notes:

Logic 1 =Open collector

Logic 0 = –Vin (pin 2) potential

AUX

+Vo₂

Do Not Connect

+Vo₁

Do Not Connect

For positive Enable function, connect pin 3

to pin 2 and use pin 4.

For negative Enable function, leave pin 4

open and use pin 3.

Note: Shaded functions indicate signals that are

referenced to the input (-Vin) potential.

Pin Descriptions

+Vin: The positive input supply for the module with respect

to –V_in. When powering the module from a –48 V telecom

central office supply, this input is connected to the primary

system ground.

TEMP: This is the output voltage produced by the module’s

internal temperature sensor. The voltage at this pin is

referenced to –V_inand rises approximately 10 mV/°C

from an intital value of 0.1 VDC at –40 °C.

–Vin: The negative input supply for the module, and the

0 VDC reference for the EN 1, EN 2, TEMP, and AUX

signals. When the module is powered from a +48-V supply,

this input is connected to the 48-V Return.

V_temp=0.5 + 0.01·T_sense

The signal is available whenever the module is supplied

with a valid input voltage, and is independant of the enable

logic status. (Note: A load impedance of less than 1 MΩ will

adversly affect the module’s over-temperature shutdown threshold.

Use a high-impedance input when monitoring this signal.)

EN 1: This an open-collector (open-drain) negative logic

input that enables the module output. This pin is TTL

compatible and referenced to -V_in. A logic ‘0’ at this pin

enables the module’s outputs, and a logic ‘1’ or high

impedance disables the module’s outputs. If not used,

the pin must be connected to –V_in.

Vo₁: The higher regulated output voltage, which is refer-

enced to the COM node.

Vo₂: The lower regulated output voltage, which is refer-

enced to the COM node.

EN 2: An open-collector (open-drain) positive logic input

that enables the module output. This pin is TTL compat-

ible and referenced to –V_in. A logic ‘1’ or high impedance

enables the module’s outputs. If not used, the pin should

be left open circuit.

COM: The secondary return reference for the module’s two

regulated output voltages. It is dc isolated from the input

supply pins.

Vo₁Adjust: Using a single resistor, this pin allows Vo₁to

be adjusted higher or lower than the preset value. If not

used, this pin should be left open circuit.

AUX: Produces a regulated output voltage of 11.6 V 5 %,

which is referenced to –V_in. The current drawn from the

pin must be limited to 10mA. The voltage may be used

to indicate the output status of the module to a primary

referenced circuit, or power a low-current amplifer.

Vo₂Adjust: Using a single resistor, this pin allows Vo₂to

be adjusted higher or lower than the preset value. If not

used, this pin should be left open circuit.

For technical support and further information, visit http://power.ti.com

PT4660 Series

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

Specifications (Unless otherwise stated, T_a=25 °C, V_in=48 V, & Io₁=Io₂=10 A)

PT4660 SERIES

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

Output Current

Io₁, Io₂

Vo₁

Vo₁≤3.3 V

Vo₁=5.0 V

All voltages

Vo₁≤3.3 V

Vo₁=5.0 V

0

—

15

10

15

30

25

A

Vo₂

Io₁+Io₂

Total (both outputs)

Input Voltage Range

Set Point Voltage Tolerance

Temperature Variation

Line Regulation

V_in

V_otol

∆Reg_temp

∆Reg_line

∆Reg_load

36

—

48

1

0.5

5

2

75

2

—

10

5

V

%V_o

mV

–40 to +100 °C Case, Io₁=Io₂=0 A

Over V_inrange with Io₁=Io₂=5 A

1 A ≤Io₁≤Io₁max, Io₂=1 A

1 A ≤Io₂≤Io₁max, Io₁=1 A

1 A ≤Io₁≤Io₁max, Io₂=1 A

Includes set-point, line load,

–40 °C to +100 °C case

Load Regulation

∆Vo₁

∆Vo₂

∆Vo₁

∆Vo₂

∆Vo₁

∆Vo₂

PT4661

PT4662

PT4663

PT4665

PT4666

PT4667

PT4668

mV

Cross Regulation

Total Output Variation

Efficiency

∆Reg_cross

∆V_otol

η

2

3

%V_o

88

87

86

85

88

86

—

%

V_oRipple (pk-pk)

V

r

Io₁=Io₂=5 A, 20 MHz bandwidth

V_o=5 V

V_o<5 V

—

75

50

mV_pp

Transient Response

t_tr

1 A/µs load step from 50 % to 100 % I_omax

(either output)

—

25

100

—

µSec

%V_o

6.0

Current Limit

Output Rise Time

Output Over-Voltage Protection

Output Voltage Adjustment

Switching Frequency

Under-Voltage-Lockout

I_LIM

t_on

OVP

∆V_oadj

f_s

Each output with other unloaded

At turn-on to within 90 % of V_o

Either output; shutdown and latch off

Vo₁, Vo₂

15.5

—

270

18

5

125

10

—

10

—

330

A

mSec

%V_o

kHz

(1)

UVLO

Rising

Falling

—

30

34

32

36

—

V

Internal Input Capacitance

C_in

—

2

—

µF

Enable Control Inputs

Input High Voltage

Input Low Voltage

Input Low Current

Referenced to –V_in

V_IH

V_IL

I_IL

3.5

0

—

0.8

V

(2)

—

0

0.5

3

—

5

mA

µF

Standby Current

I_instandby

C_out

V_iso

C _iso

R_iso

Pins 2, 3, & 4 connected

Per each output

External Output Capacitance

Primary/Secondary Isolation

—

5,000

1500

—

V

1500

—

pF

MΩ

10

(3)

Temperature Sense

V_temp

Output voltage at temperatures:-

Over V_inrange

–40 °C

—

–40

0.1

1.5

—

V

100 °C

—

Operating Temperature Range

T

a

85 ⁽⁴⁾

°C

Over-Temperature

ProtectionOTP

Case

temperature

(auto

restart)

100

—

°C

Solder Reflow Temperature

Storage Temperature

Mechanical Shock

T_reflow

Surface temperature of module pins or case

—

–40

—

500

10

20

215 ⁽⁵⁾

125

—

°C

G’s

T

s

—

Per Mil-STD-883D, Method 2002.3

Per Mil-STD-883D, Method 2007.2, Suffix N

(6)

Mechanical Vibration

G’s

20–2,000 Hz

Suffixes A, C

Weight

Flammability

—

90

—

grams

Materials meet UL 94V-0

Notes: (1) This is a fixed parameter. Adjusting Vo₁or Vo₂higher will increase the module’s sensitivity to over-voltage detection. For more information, see the

application note on output voltage adjustment.

(2) The EN₁and EN₂control inputs (pins 3 & 4) have internal pull-ups and may be controlled with an open-collector (or open-drain) transistor. Both

inputs are diode protected and can be connected to +V_in. The maximum open-circuit voltage is 5.4 V.

(3) Voltage output at “TEMP” pin is defined by the equation:- V_TEMP= 0.5 + 0.01·T, where T is in °C. See pin descriptions for more information.

(4) See SOA curves or consult the factory for the appropriate derating.

(5) During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak of 215 °C. For

further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).

(6) The case pins on the through-holed package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.

For technical support and further information, visit http://power.ti.com

PT4661—48 V

Typical Characteristics

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

PT4661 (V₁/V₂=5.0V/3.3V); V_in=48V (See Notes A & B)

Efficiency vs I₁out; I₂out @1A, 3A, and 6A

Power Dissipation vs (Io₁+ Io₂)

100

20

16

12

8

90

I

₂out

80

70

60

50

6

3

1

4

0

2

4

6

8

10

0

5

10

15

20

25

I₁out (A)

Io₁+ Io₂(A)

Safe Operating Area: (Io₁+ Io₂)

Efficiency vs I₁out; I₂out @9A, 12A, and 15A

90

80

70

60

50

40

30

20

100

90

80

70

60

50

Airflow

I₂out

300LFM

200LFM

100LFM

Nat Conv

9

12

15

0

5

10

15

20

25

0

2

4

6

8

10

Io₁+ Io₂(A)

I₁out (A)

Cross Regulation: V₁out vs I₂out @I₁out =1A

5.05

5.025

5

4.975

4.95

0

3

6

9

12

15

I₂out (A)

Cross Regulation: V₂out vs I₁out @I₂out =1A

3.32

3.31

3.3

3.29

3.28

0

2

4

6

8

10

I₁out (A)

Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the converter.

Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

For technical support and further information, visit http://power.ti.com

Typical Characteristics

PT4662—48 V

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

PT4662 (V₁/V₂=3.3 V/2.5 V); V_in=48 V (See Notes A & B)

Efficiency vs I₁out; I₂out @1 A, 3 A, and 6 A

Power Dissipation vs (Io₁+ Io₂)

90

20

16

12

8

85

I₂out

6

3

1

80

75

70

4

0

3

6

9

12

15

0

6

12

18

24

30

I₁out (A)

Io_{1 +}Io₂(A)

Safe Operating Area: (Io₁+ Io₂)

Efficiency vs I₁out; I₂out @9 A, 12 A, and 15 A

90

85

80

75

70

90

80

70

60

50

40

30

20

Airflow

I₂out

300LFM

200LFM

100LFM

Nat conv

9

12

15

0

3

6

9

12

15

0

5

10

15

20

25

30

I₁out (A)

Io₁+ Io₂(A)

Cross Regulation: V₁out vs I₂out @I₁out =1 A

3.36

3.33

3.30

3.27

3.24

0

3

6

9

12

15

I₂out (A)

Cross Regulation: V₂out vs I₁out @I₂out =1 A

2.530

2.515

2.500

2.485

2.470

0

3

6

9

12

15

I₁out (A)

Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25 °C. This data is considered typical data for the converter.

Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

For technical support and further information, visit http://power.ti.com

Typical Characteristics

PT4663—48 V

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

PT4663 (V₁/V₂=3.3 V/1.8 V); V_in=48 V (See Notes A & B)

Efficiency vs I₁out; I₂out @1 A, 3 A, and 6 A

Power Dissipation vs (Io₁+ Io₂)

90

20

16

12

8

85

I₂out

6

80

75

70

3

1

4

0

3

6

9

12

15

0

6

12

18

24

30

I₁out (A)

Io₁+ Io₂(A)

Safe Operating Area: (Io₁+ Io₂)

Efficiency vs I₁out; I₂out @9 A, 12 A, and 15 A

90

85

80

75

70

90

80

70

60

50

40

30

20

Airflow

I₂out

300LFM

200LFM

100LFM

Nat Conv

9

12

15

0

5

10

15

20

25

30

0

3

6

9

12

15

Io₁+ Io₂(A)

Iout (A)

Cross Regulation: V₁out vs I₂out @I₁out =1 A

3.36

3.34

3.32

3.3

3.28

3.26

3.24

0

3

6

9

12

15

I₂out (A)

Cross Regulation: V₂out vs I₁out @I₂out =1 A

1.82

1.81

1.8

1.79

1.78

0

3

6

9

12

15

I₁out (A)

Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25 °C. This data is considered typical data for the converter.

Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

For technical support and further information, visit http://power.ti.com

Typical Characteristics

PT4665—48 V

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

PT4665 (V₁/V₂=3.3 V/1.5 V); V_in=48 V (See Notes A & B)

Efficiency vs I₁out; I₂out @1 A, 3 A, and 6 A

Power Dissipation vs (Io₁+ Io₂)

100

20

16

12

8

90

I₂out

80

6

3

1

70

60

50

4

0

3

6

9

12

15

0

6

12

18

24

30

I₁out (A)

Io₁+ Io₂(A)

Safe Operating Area: (Io₁+ Io₂)

Efficiency vs I₁out; I₂out @9 A, 12 A, and 15 A

100

90

80

70

60

50

90

80

70

60

50

40

30

20

Airflow

I₂out

300LFM

200LFM

100LFM

Nat Conv

9

12

15

0

3

6

9

12

15

0

5

10

15

20

25

30

I₂out (A)

Io₁+ Io₂(A)

Cross Regulation: V₁out vs I₂out @I₁out =1 A

3.32

3.31

3.3

3.29

3.28

0

3

6

9

12

15

I₂out (A)

Cross Regulation: V₂out vs I₁out @I₂out =1 A

1.51

1.505

1.5

1.495

1.49

0

3

6

9

12

15

I₁out (A)

Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25 °C. This data is considered typical data for the converter.

Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

For technical support and further information, visit http://power.ti.com

Typical Characteristics

PT4666—48 V

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

PT4666 (V₁/V₂=2.5 V/1.8 V); V_in=48 V (See Notes A & B)

Efficiency vs I₁out; I₂out @1 A, 3 A, and 6 A

Power Dissipation vs I₁out and I₂out

100

10

8

90

I₂out

80

6

3

1

70

4

60

50

2

0

3

6

9

12

15

0

3

6

9

12

15

I₁out (A)

Io₁+ Io₂(A)

Efficiency vs I₁out; I₂out @9 A, 12 A, and 15 A

Safe Operating Area: (Io₁+ Io₂)

100

90

80

70

60

50

90

80

70

60

50

40

30

20

Airflow

I₂out

300LFM

200LFM

100LFM

Nat Conv

9

12

15

0

3

6

9

12

15

0

5

10

15

20

25

30

I₁out (A)

Io₁+ Io₂(A)

Cross Regulation: V₁out vs I₂out @I₁out =1 A

2.52

2.51

2.5

2.49

2.48

0

3

6

9

12

15

I₂out (A)

Cross Regulation: V₂out vs I₁out @I₂out =1 A

1.81

1.805

1.8

1.795

1.79

0

3

6

9

12

15

I₁out (A)

Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25 °C. This data is considered typical data for the converter.

Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

For technical support and further information, visit http://power.ti.com

Typical Characteristics

PT4667—48 V

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

PT4667 (V₁/V₂=5 V/1.8 V); V_in=48 V (See Notes A & B)

Efficiency vs I₁out; I₂out @1 A, 3 A, and 6 A

Power Dissipation vs (Io₁+ Io₂)

100

20

16

12

8

90

I₂out

80

6

3

1

70

60

50

4

0

2

4

6

8

10

0

5

10

15

20

25

I₁out (A)

Io₁+ Io₂(A)

Safe Operating Area: (Io₁+ Io₂)

Efficiency vs I₁out; I₂out @9 A, 12 A, and 15 A

90

80

70

60

50

40

30

20

100

90

80

70

60

50

Airflow

I₂out

300LFM

200LFM

100LFM

Nat conv

9

12

15

0

5

10

15

20

25

0

2

4

6

8

10

Io₁+ Io₂(A)

I₁out (A)

Cross Regulation: V₁out vs I₂out @I₁out =1 A

5.02

5.01

5

4.99

4.98

0

3

6

9

12

15

I₂out (A)

Cross Regulation: V₂out vs I₁out @I₂out =1 A

1.81

1.805

1.8

1.795

1.79

0

2

4

6

8

10

I₁out (A)

Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25 °C. This data is considered typical data for the converter.

Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

For technical support and further information, visit http://power.ti.com

Typical Characteristics

PT4668—48 V

30-A Dual Output Isolated

DC/DC Converter

SLTS140C – MAY 2001 – REVISED OCTOBER 2003

PT4668 (V₁/V₂=3.3 V/1.2 V); V_in=48 V (See Notes A & B)

Efficiency vs I₁out; I₂out @1 A, 3 A, and 6 A

Power Dissipation vs (Io₁+ Io₂)

100

20

16

12

8

90

I

₂out

80

70

60

50

6

3

1

4

0

6

12

18

24

30

0

3

6

9

12

15

Io₁+ Io₂(A)

I₁out (A)

Efficiency vs I₁out; I₂out @9 A, 12 A, and 15 A

Safe Operating Area: (Io₁+ Io₂)

90

80

70

60

50

40

30

20

100

90

80

70

60

50

Airflow

I₂out

300LFM

200LFM

100LFM

Nat Conv

9

12

15

0

5

10

15

20

25

30

0

3

6

9

12

15

Io₁+ Io₂(A)

I₁out (A)

Cross Regulation: V₁out vs I₂out @I₁out =1 A

3.32

3.31

3.3

3.29

3.28

0

3

6

9

12

15

I₂out (A)

Cross Regulation: V₂out vs I₁out @I₂out =1 A

1.21

1.205

1.2

1.195

1.19

0

3

6

9

12

15

I₁out (A)

Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25 °C. This data is considered typical data for the converter.

Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

For technical support and further information, visit http://power.ti.com

Application Notes

PT4660 & PT4680 Series

Operating Features & System Considerations for the

PT4660 & PT4680 Dual-Output Converters

host system for diagnostic purposes. Consult the ‘Pin

Descriptions’ section of the data sheet for further infor-

mation on this feature.

Over-Current Protection

The dual-outputs of the PT4660 and PT4680 series of

DC/DC converters have independent output voltage

regulation and current limit control. Applying a load

current in excess of the current limit threshold at either

output will cause the respective output voltage to drop.

However, the voltage at Vo₂is derived from Vo₁. There-

fore a current limit fault on Vo₁will also cause Vo₂to

drop. Conversely, a current limit fault applied to Vo₂

will only cause Vo₂voltage to drop, and Vo₁will remain

in regulation.

Under-Voltage Lock-Out

The Under-Voltage Lock-Out (UVLO) circuit prevents

operation of the converter whenever the input voltage to

the module is insufficient to maintain output regulation.

The UVLO has approximately 2 V of hysterisis. This is

to prevent oscillation with a slowly changing input volt-

age. Below the UVLO threshold the module is off and

the enable control inputs, EN1 and EN2 are inoperative.

The current limit is continuous with some current fold-

back. This means that at short circuit, the value of the

output current can be less than the rated output of the

converter. This is to reduce power dissipation when a fault

is present. As with any foldback-limited source, if a con-

stant current load is applied to the converter with a value

greater than the short-circuit current, the output voltage

will not come up. Resistive and non-linear load circuits

are not affected by this characteristic as long as the cur-

rent at startup does not exceed the short-circuit current

of the converter. The majority of low-voltage analog

and digital applications are not affected by this restric-

tion. However, when testing with an electronic load the

constant resistance setting should be used.

Primary-Secondary Isolation

The PT4460 and PT4680 series of DC/DC converters

incorporate electrical isolation between the input termi-

nals (primary) and the output terminals (secondary). All

converters are production tested to a withstand voltage

of 1500 VDC. The isolation complies with UL60950 and

EN60950, and the requirements for operational isolation.

This allows the converter to be configured for either a

positive or negative input voltage source.

The regulation control circuitry for these modules is

located on the secondary (output) side of the isolation

barrier. Control signals are passed between the primary

and secondary sides of the converter via a proprietory

magnetic coupling scheme. This eliminates the use of

opto-couplers. The data sheet ‘Pin Descriptions’ and

‘Pin-Out Information’ provides guidance as to which

reference (primary or secondary) that must be used for

each of the external control signals.

Output Over-Voltage Protection

Each output is monitored for over voltage (OV). For fail

safe operation and redundancy, the OV fault detection

circuitry uses a separate reference to the voltage regula-

tion circuits. The OV threshold is fixed, and set nominally

25 % higher than the set-point output voltage. If either

output exceeds the threshold, the converter is shutdown

and must be actively reset. The OV protection circuit

can be reset by momentarily turning the converter off.

This is accomplished by either cycling one of the output

enable control pins (EN1 or EN2), or by removing the

input power to the converter. Note: If Vo₁or Vo₂is adjusted

to a higher voltage, the margin between the respective steady-

state output voltage and its OV threshold is reduced. This can

make the module sensitive to OV fault detection, that may

result from random noise and load transients.

Fuse Requirements

To comply with safety agency requirements, these con-

verters must be operated with an external input fuse.

A fast-acting 250-V fuse is required. Table 1-1 gives

the recommended current rating for the product series

being used.

Table 1-1; Recommended Fuse Rating

Product

Series

Input

Bus

Total

Iout

Fuse

Rating

Over-Temperature Protection

PT4660

PT4680

48 V

24 V

30 A

20 A

7 A

10 A

The converter has an internal temperature sensor. At a

case temperature of approximately 115 °C the converter

will shut down, and will automatically restart when the

temperature returns to about 100 °C. The analog voltage

generated by the sensor is also made available at the

TEMP output (pin 5), and can be monitored by the

For technical support and further information, visit http://power.ti.com

Application Notes

PT4660 & PT4680 Series

the outputs of the converter. An example of this configu-

ration is detailed in Figure 2-2. Note: The converter will

only produce and output voltage if a valid input voltage is

applied to V_in.

Using the On/Off Enable Controls on the PT4660

& PT4680 Series of Dual-Output Converters

The PT4660 (48V input) and PT4680 (24V input) se-

ries of dual-output DC/DC converters incorporate

both positive and negative logic output enable controls.

EN1 (pin 3) is the negative enable input, and EN2 (pin 4)

is the positive enable input. Both inputs are TTL logic

compatible, and are electrically referenced to -V_in(pin 2)

on the primary (input) side of the converter. A pull-up

resistor is not required, but may be added if desired.

Adding a pull-up resistor from either EN1 or EN2, up to

+V_in, will not damage the converter.

Figure 2-2; Negative Enable Configuration

3

EN 1*

4

EN

2

PT4660

1

=Outputs On

BSS138

– V_IN

Automatic (UVLO) Power-Up

2

–Vin

Connecting EN1 (pin 3) to -V_in(pin 2) and leaving EN2

(pin 4) open-circuit configures the converter for automatic

power up. (See data sheet “Typical Application”). The

converter control circuitry incorporates an “Under Voltage

Lockout” (UVLO) function, which disables the output

until the minimum specified input voltage is present

(See data sheet Specifications). The UVLO circuitry

ensures a clean transition during power-up and power-

down, allowing the converter to tolerate a slow-rising

input voltage. For most applications EN1 and EN2, can

be configured for automatic power-up.

On/Off Output Voltage Sequencing

The output voltages from these dual-output DC/DC

converters are independantly regulated, and are inter-

nally sequenced to meet the power-up requirements of

popular microprocessor and DSP chipsets. Figure 2-3

shows the waveforms from a PT4661 after the converter

is enabled at t=0s. During power-up, the Vo₁and Vo₂

voltage waveforms typically track within 0.4V prior to

Vo₂reaching regulation. The waveforms were measured

with a 5-Adc resistive load at each output, and with a

48-VDC input source applied. The converter typically

produces a fully regulated output within 25ms. The

actual turn-on time will vary slightly with input voltage,

but the power-up sequence is independent of the load at

either output.

Positive Output Enable (Negative Inhibit)

To configure the converter for a positive enable function,

connect EN1 (pin 3) to -V_in(pin 2), and apply the system

On/Off control signal to EN2 (pin 4). In this configura-

tion, a logic ‘0’ (-V_inpotential) applied to pin 4 disables

the converter outputs. An example of this configuration

is detailed in Figure 2-1.

Figure 2-1; Positive Enable Configuration

Figure 2-3; Vo₁, Vo₂Power-Up Sequence

Vo₁(2V/Div)

Vo₂(2V/Div)

3

EN 1*

4

EN

2

PT4660

I_IN(0.5A/Div)

1

=Outputs Off

– V_IN

BSS138

2

–Vin

0

5

10

15

20

25

30

35

t (milliseconds)

During turn-off, both outputs drop rapidly due to the

discharging effect of actively switched rectifiers. The

voltage at Vo₁remains higher than Vo₂during this

period. The discharge time is typically 100µs, but will

vary with the amount of external load capacitance.

Negative Output Enable (Positive Inhibit)

To configure the converter for a negative enable function,

EN2 (pin 4) is left open circuit, and the system On/Off

control signal is applied to EN1 (pin 3). A logic ‘0’ (-V_in

potential) must then be applied to pin 3 in order to enable

For technical support and further information, visit http://power.ti.com

Application Notes

PT4660 & PT4680 Series

Adjusting the Output Voltage of the PT4660

& PT4680 Series of Dual-Output Converters

3. Vo₂must always be at least 0.3 V lower than Vo₁.

4. The over-voltage protection threshold is fixed, and is set

nominally 25 % above the set-point output voltage.

Adjusting Vo₁or Vo₂higher will reduce the voltage

margin between the respective steady-state output

voltage and its over-voltage (OV) protection threshold.

This could make the module sensitive to OV fault

detection, as a result of random noise and load tran-

sients.

The dual output voltages from the PT4660 (48-V Bus),

and PT4680 (24-V Bus) series of DC/DC converters can

be independently adjusted by up to 10 %, higher or lower

than the factory trimmed pre-set voltage. The adjustment

method requires the addition of a single external resistor ¹.

Table 3-1 gives the adjustment range of Vo₁and Vo₂for

each model in the series as V_a(min) and V_a(max).

Note: An OV fault is a latched condition that shuts down

both outputs of the converter. The fault can only be cleared

by cycling one of the Enable control pins (EN₁* / EN₂), or

by momentarily removing the input power to the module.

Vo₁Adjust Down: Add a resistor (R₁), between pin 13

(Vo₁Adj) and pin 12 (Vo₁) ².

Vo₁Adjust Up: To increase the output, add a resistor R₂

5. Never connect capacitors to either the Vo₁Adj or

Vo₂Adj pins. Any capacitance added to these control

pins will affect the stability of the respective regulated

output.

between pin 13 (Vo₁Adj) and pin 14 (COM) ^{2, 4}

.

Vo₂Adjust Down: Add a resistor (R₃) between pin 20

(Vo₂Adj) and pin 21 (Vo₂) ².

The adjust up and adjust down resistor values can also be

calculated using the following formulas. Be sure to select

the correct formula parameter from Table 3-1 for the

output and model being adjusted.

Vo₂Adjust Up: Add a resistor R₄between pin 20

(Vo₂Adj) and pin 19 (COM) ^{2, 4}

.

Refer to Figure 3-1 and Table 3-2 for both the placement and

value of the required resistor.

R_o· (V_a– V_r)

(R₁) or (R₃)

R₂or R₄

=

– R_s

kΩ

(V_o– V_a)

Notes:

R_o· V_r

V_a– V_o

1. Adjust resistors are not required if Vo₁and Vo₂are to

remain at their respective nominal set-point voltage.

In this case, Vo₁Adj (pin 13) and Vo₂Adj (pin 20) are

left open-circuit

Where: V_o= Original output voltage, (Vo₁or Vo₂)

V_a= Adjusted output voltage

2. Use only a single 1% resistor in either the (R₁) or R₂

location to adjust Vo₁, and in the (R₃) or R₄location

to adjust Vo₂. Place the resistor as close to the converter

as possible.

V_r= The reference voltage from Table 3-1

R_o= The resistance constant in Table 3-1

R_s= The series resistance from Table 3-1

Figure 3-1; Placement of Output Adjust Resistors

Vo₁

Vo₂

9–12

Vo ₁

Vo ₂

+ V_IN

1

+Vin

21–24

(R1)

(R3)

PT4660

13

20

Vo ₁adj

Vo ₂adj

L

O

A

D

L

O

A

D

3

EN 1*

4

EN

2

– V_IN

2

–Vin

R 2

R 4

C O M

14–19

COM

*

Inverted logic

For technical support and further information, visit http://power.ti.com

Application Notes

PT4660 & PT4680 Series

Table 3-1; ADJUSTMENT RANGE AND FORMULA PARAMETERS

Vo₁Bus

Vo₂Bus ⁽²⁾

24 V Bus Pt.# PT4681/7 PT4682/3/5/8

48 V Bus Pt.# PT4661/7 PT4662/3/5/8

PT4686

PT4666

(R1)/R2

PT4681

PT4661

(R3)/R4

PT4682

PT4662

(R3)/R4

PT4683/7

PT4663/7

(R3)/R4

PT4686

PT4666

(R3)/R4

PT4685

PT4665

(R3)/R4

PT4668

(R3)/R4

Adj. Resistor

(R1)/R2

V_o(nom)

Va(min)

Va(max)

Vr

5.0 V

4.5 V

5.5 V

2.5 V

4.99

20.0

3.3 V

2.97 V

3.63 V

1.65 V

4.99

2.5 V

2.25 V

2.75 V

1.25

4.99

20.0

3.3 V

2.97 V

3.63 V

1.65 V

1.21

2.5 V

2.25 V

2.75 V

1.25 V

1.21

1.8 V

1.62 V

1.98 V

0.9 V

1.21

1.8 V

1.62 V

1.98 V

0.9 V

1.21

1.5 V

1.35 V

1.65 V

0.75 V

1.21

1.2 V

1.08 V

1.32 V

0.6V

1.21

3.32

R_o(kΩ)

R_s(kΩ)

20.0

4.99

3.32

4.99

Table 3-2a; ADJUSTMENT RESISTOR VALUES, Vo₁

24 V Bus Pt.# PT4681/7

48 V Bus Pt.# PT4661/7

PT4682/3/5

PT4662/3/5/8

(R1)/R2

PT4686

PT4666

(R1)/R2

Adj. Resistor

(R1)/R2

V_o(nom)

V_a(req’d)

5.5

5.4

5.3

5.2

5.1

5.0

5.0 V

3.3 V

2.5 V

V_a(req’d)

3.6

V_a(req’d)

2.75

2.7

2.65

2.6

2.55

2.5

5.0 kΩ

11.2 kΩ

21.6 kΩ

42.4 kΩ

105.0 kΩ

7.4 kΩ

14.3 kΩ

25.7 kΩ

48.6 kΩ

117.0 kΩ

5.0 kΩ

11.2 kΩ

21.6 kΩ

42.4 kΩ

105.0 kΩ

3.54

3.48

3.42

3.36

3.3

2.45

2.4

2.35

2.3

(99.8 kΩ)

(37.4 kΩ)

(16.6 kΩ)

(6.2 kΩ)

(0.0 kΩ)

3.24

3.18

3.12

3.06

3.0

(112.0 kΩ)

(43.6 kΩ)

(20.8 kΩ)

(9.3 kΩ)

4.9

4.8

4.7

4.6

(99.8) kΩ

(37.4) kΩ

(16.6) kΩ

(6.2) kΩ

(0.0)

2.25

(2.5 kΩ)

4.5

R₁= (Blue), R₂= Black

Table 3-2b; ADJUSTMENT RESISTOR VALUES, Vo₂

24 V Bus Pt.# PT4681

PT4682

PT4662

(R3)/R4

PT4683/6/7

PT4663/6/7

(R3)/R4

PT4686

PT4685

PT4665

(R3)/R4

48 V Bus Pt.# PT4661

PT4666

(R3)/R4

PT4668

Adj. Resistor

(R3)/R4

V_o(nom)

V_a(req’d)

3.6

3.54

3.48

3.42

3.36

3.3

3.24

3.18

3.12

3.06

3.0

2.75

2.7

2.65

2.6

2.55

2.5

2.45

2.4

3.3 V

2.5 V

1.8 V

1.5 V

1.2 V

V_a(req’d)

1.95

1.9

1.85

1.8

1.75

1.7

1.65

1.6

1.55

1.5

1.45

1.4

1.35

1.3

1.275

1.25

1.225

1.2

1.7 kΩ

3.3 kΩ

6.1 kΩ

11.6 kΩ

28.3 kΩ

2.3 kΩ

5.9 kΩ

16.8 kΩ

3.9 kΩ

7.6 kΩ

18.5 kΩ

(15.6) kΩ

(4.7) kΩ

(1.1) kΩ

(17.3) kΩ

(6.4) kΩ

(2.7) kΩ

(27.1) kΩ

(10.4) kΩ

(4.9) kΩ

(2.1) kΩ

(0.5) kΩ

1.1 kΩ

4.1 kΩ

13.2 kΩ

(12.0) kΩ

(2.9) kΩ

(0.0) kΩ

1.1 kΩ

2.6 kΩ

5.1 kΩ

10.1 kΩ

25.3 kΩ

3.9 kΩ

6.4 kΩ

11.2 kΩ

25.7 kΩ

(24.1) kΩ

(8.9) kΩ

(3.9) kΩ

(1.4) kΩ

(0.0)kΩ

1.175

1.15

1.125

1.1

(24.5) kΩ

(10.0) kΩ

(5.2) kΩ

(2.7) kΩ

2.35

2.3

2.25

R₃= (Blue), R₄= Black

For technical support and further information, visit http://power.ti.com

PACKAGE OPTION ADDENDUM

www.ti.com

24-Jun-2005

PACKAGING INFORMATION

Orderable Device

PT4661A

PT4661C

PT4661N

PT4662A

PT4662C

PT4662N

PT4663A

PT4663C

PT4663N

PT4665A

PT4665C

PT4665N

PT4666A

PT4666C

PT4666N

PT4667A

PT4667C

PT4667N

PT4668A

PT4668C

PT4668N

Status ⁽¹⁾

ACTIVE

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

SIP MOD

ULE

EKA

26

6

TBD

Call TI

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

SIP MOD

ULE

EKC

EKD

EKA

EKC

EKD

EKA

EKC

EKD

EKA

EKC

EKD

EKA

EKC

EKD

EKA

EKC

EKD

EKA

EKC

EKD

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

Eco Plan

24-Jun-2005

(2)

-

The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS

&

no Sb/Br)

-

please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

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incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 2

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

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Mailing Address:

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Post Office Box 655303 Dallas, Texas 75265


型号：	PT4661C
厂家：	TEXAS INSTRUMENTS
描述：	30-A Dual Output Isolated DC/DC Converter 30 -A双输出隔离式DC / DC转换器转换器
文件：	总17页 (文件大小：336K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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