PET2000-12-074XD [BEL]
DC-DC FRONT END POWER SUPPLY;
| 型号： | PET2000-12-074XD |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC FRONT END POWER SUPPLY |
| 文件： | 总26页 (文件大小：2268K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
The PET2000-12-074xD is a 2000 Watt DC to DC power supply that
converts -40 to -72 VDC voltage into an isolated main output of
+12 VDC for powering intermediate bus architectures (IBA) in high
performance and reliability servers, routers, and network switches.
The PET2000-12-074xD utilizes full digital control architecture for
greater efficiency, control, and functionality.
his power supply meets international safety standards.
Best-in-class, “Platinum” efficiency
Wide input voltage range: -40 to -72 VDC
Always-On 12 V / 2.5 A / 30 W standby output
Hot-plug capable
•
•
Parallel operation with active current sharing
Full digital controls for improved performance
High density design: 42.1 W/in3
Small form factor: 73.5 x 40.0 x 265 mm
PMBus® communication interface for control, programming
and monitoring
Status LED with fault signaling
•
Networking Switches
Servers & Routers
•
•
•
Telecommunications
Disclaimer: PMBus is a registered trademark of SMIF, Inc.
2
PET2000-12-074xD
1.
PET
2000
-
12
-
074
x
D
x
Product Family Power Level
Dash V1 Output
Dash Width
Airflow
Input
DC Inlet
-
K
Y
- Black, 6 AWG (C10-747100)*
- Black, 4 AWG (C10-747442)
- Grey, 6 AWG (C10-638974)
N: Normal
R: Reverse
PET Front-Ends 2000 W
12 V
74 mm
D: DC
* Default option – no suffix needed.
Input plug with wire: Amphenol # CR-302001-257
2.
The PET2000-12-074xD DC/DC power supply is a fully DSP controlled, highly efficient front-end power supply. It incorporates state-
of-the art technology and uses an interleaved forward converter topology with active clamp and synchronous rectification to reduce
component stresses, thus providing increased system reliability and very high efficiency.
With a wide input DC voltage range the PET2000-12-074xD maximizes power availability in demanding server, network, and other
high availability applications. The supply is fan cooled and ideally suited for integration with a matching airflow path.
An active OR-ing device on the output ensures no reverse load current and renders the supply ideally suited for operation in
redundant power systems.
The always-on standby output provides power to external power distribution and management controllers. It is protected with an
active OR-ing device for maximum reliability.
Status information is provided with a front-panel LED. In addition, the power supply can be controlled and the fan speed set via the
I2C bus. The I2C bus allows full monitoring of the supply, including input and output voltage, current, power, and inside temperatures.
Cooling is managed by a fan controlled by the DSP controller. The fan speed is adjusted automatically depending on the actual
power demand and supply temperature and can be overridden through the I2C bus.
Figure 1. Block Diagram
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PET2000-12-074xD
3.
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely affect long-term reliability and
cause permanent damage to the supply.
PARAMETER
Vi max Maximum Input Voltage
CONDITIONS / DESCRIPTION
MIN
MAX
UNITS
Continuous
-72
VDC
4.
General Condition: TA = 0…40 °C (PET2000-12-074RD), TA = 0…55 °C (PET2000-12-074ND), unless otherwise noted.
PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
Minimum Operating Input
Voltage
Vi start
Stand-by output available, DSP running
-32
VDC
Vi nom
Nominal Input Voltage
-53
VDC
VDC
A
Vi
Ii
Input Voltage
Normal operation (from Vi min to Vi max)
Vi > Vi min
-40
-72
55
Input Current
Ii pk
Inrush Current Limitation
From Vi min to Vi max, TA = 25°C, turn on
40
A
Turn-On Standby Input
Voltage
Vi on
Ramping up
-30
VDC
Vi on
Vi off
Turn-On Input Voltage
Ramping up
-41
-42
VDC
VDC
%
Turn-Off Input Voltage
Ramping down
-38.0
-39.5
Vi = -53 VDC; 20% load
Vi = -53 VDC; 50% load
Vi = -53 VDC; 100% load
93
95
93
η
Efficiency
%
%
167 A on I1, 2.5 A on Vsb with 2,200 µF of Load
capacitance
167 A on I1, 2.5 A on Vsb with 2,200 µF of Load
capacitance
Thold_V1
Thold_sb
Hold-Up Time V1
Hold-Up Time Vsb
5
6
ms
ms
12
18
4.1 INPUT FUSE
A fast-acting 80 A input fuse in the negative voltage path inside the power supply protect against severe defects.
The fuse is not accessible from the outside and are therefore not serviceable parts.
4.2 INRUSH CURRENT
Internal bulk capacitors will be charged through resistors connected from bulk cap minus pin to the DC rail minus, thus limiting
the inrush current. After the inrush phase, NTC resistors are then shorted with MOSFETs connected in parallel. The Inrush
control is managed by the digital controller (DSP).
4.3 INPUT UNDER-VOLTAGE
If the value of input DC voltage stays below the input under voltage lockout threshold Vi on, the supply will be inhibited.
Once the input voltage returns within the normal operating range, the supply will return to normal operation again. If the input
voltage stays below the input undervoltage lockout threshold Vi on, the supply will be inhibited. Once the input voltage returns
within the normal operating range, the supply will return to normal operation again.
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PET2000-12-074xD
5.
General Condition: TA = 0…40 °C (PET2000-12-074RD), TA = 0…55 °C (PET2000-12-074ND), unless otherwise noted.
PARAMETER
Main Output V1
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
V1 nom
V1 set
Nominal Output Voltage
12.0
VDC
0.5 ∙ I1 nom, TA = 25°C
Output Setpoint Accuracy
Total Static Regulation
-0.5
-5
+0.5
+5
%V1 nom
%V1 nom
dV1 tot
Vi min to Vi max, 0 to 100% I1 nom, TA = 0 to 40°C
Vi min to Vi max, TA = 0 to 55°C (PET2000-12-074ND)
Vi min to Vi max,, TA = 0 to 40°C (PET2000-12-074RD)
Vi min to Vi max,, TA = 0 to 55°C (PET2000-12-074ND)
Vi min to Vi max,, TA = 0 to 40°C (PET2000-12-074RD)
P1 nom
Nominal Output Power 1
2000
W
I1 nom
I1 peak
V1 pp
Output Current
0.0
0.0
167
120
ADC
Peak Output Current
Output Ripple Voltage 2
Load Regulation
Vi min to Vi max
,
175.3
ADC
mVpp
mV
Vi min to Vi max, 0 to 100% I1 nom, Cext ≥ 1 mF/Low ESR
Vi nom , 0 to 100% I1 nom
dV1 load
dV1 line
dV1 temp
dI1 share
VISHARE
dV1 lt
-160
0
Line Regulation
Vi min to Vi max, 0.5 ∙ I1 nom
-20
-4
20
-0.5
+4
mV
Thermal Drift
Vi nom HL, 0.5 ∙ I1 nom
mV/°C
ADC
VDC
VDC
ms
Current Sharing
Deviation from I1 tot / N, I1 > 10%
I1 peak at 180 A
Current Share Bus Voltage
Load Transient Response
Recovery Time
9.4
0.5
0.6
1
ΔI1 = 50% I1 nom, I1 = 10 … 100% I1 nom, Cext = 0 mF,
dI1/dt = 1A/μs, recovery within 1% of V1 nom
trec
ΔI1 = 50% I1 nom, starting anywere from 10% to 60%,
f = 50 ... 5000 Hz, Duty cycle = 10 ... 90%,
Cext = 2 ...30mF, di/dt =1A/µs, 25°C
V1 dyn
Dynamic Load Regulation
11.4
12.6
V
tV1 on delay
tV1 rise
Delay time from DC applied
Output Voltage Rise Time
Output Turn-on Overshoot
Remote Sense
V1 in regulation Vi = 0V to Vi min , Vi nom, Vi max
V1 = 10…90% V1 nom, Cext < 10 mF
Vi nom , 0 to 100% I1 nom
3
sec
ms
V
10
200
13.2
0.25
20
tV1 ovr sh
dV1 sense
CV1 load
OVP
Compensation for cable drop, 0 to 100% I1 nom
V
Capacitive Loading
0
mF
V
Over voltage Trip
Vi min to Vi max
,
13.6
15.0
Standby Output VSB
VSB nom Nominal Output Voltage
VSB set
ISB =1.25A (50% of ISBnom, 25°C, (PET2000-12-074ND))
ISB =1.50A (50% of ISBnom, 25°C, (PET2000-12-074RD))
12.0
VDC
Output Setpoint Accuracy
Total Regulation
-2
-5
+2
+5
%VSBnom
dVSB tot
Vi min to Vi max, 0 to 100% ISB nom
%VSBnom
Vi min to Vi max, TA = 0 to 70°C (PET2000-12-074ND)
Vi min to Vi max, TA = 0 to 55°C (PET2000-12-074RD)
Vi min to Vi max (PET2000-12-074ND)
30
36
34
40
W
W
W
PSB nom
PSB peak
ISB nom
Nominal Output Power
Peak Output Power
Output Current
Vi min to Vi max (PET2000-12-074RD)
W
Vi min to Vi max, TA = 0 to 70°C (PET2000-12-074ND)
Vi min to Vi max, TA = 0 to 55°C (PET2000-12-074RD)
Vi min to Vi max (PET2000-12-074ND)
0
0
2.85
2.5
3.0
4.5
5
ADC
ADC
ADC
ADC
3.8
3.5
ISB peak
Peak Output Current
Vi min to Vi max (PET2000-12-074RD)
3.4
Vi min to Vi max, 0 to 100% ISB nom, Cext = 0 mF
Vi min to Vi max, 0 to 100% ISB nom, Cext ≥ 2 mF/Low ESR
Vi nom HL, 0 to 100% ISB nom
150
120
mVpp
mVpp
mV
VSB pp
Output Ripple Voltage 2
dVSB load
dVSB line
dVSB temp
dISB share
Load Regulation
Line Regulation
Thermal Drift
-300
4
Vi min to Vi max, ISB nom = 0 A
-20
-1
20
-0.5
+1
mV
Vi nom HL, ISB nom = 0 A
mV/°C
ADC
Current Sharing
Deviation from ISB tot / N, ISB = 0.5 ∙ ISB nom
1 See also chapter TEMPERATURE AND FAN CONTROL
2 Measured with a 10 µF low ESR capacitor in parallel with a 0.1 µF ceramic capacitor at the point of measurement
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PET2000-12-074xD
dVSB lt
trec
Load Transient Response
Recovery Time
0.2
1
0.3
2
VDC
ms
ΔISB = 50% ISB nom, ISB = 0 … 100% ISB nom
dISB/dt = 1A/µs, recovery within 1% of VSB nom
,
ΔISB = 1 A, ISB = 0 … ISB nom, f = 50 ... 5000 Hz,
Duty cycle = 10 ... 90%, Cext = 0 ... 5 mF
VSB dyn
Dynamic Load Regulation
10.8
5
13.2
V
tVSB rise
tVSB ovr sh
CVSB load
Output Voltage Rise Time
Output Turn-on Overshoot
Capacitive Loading
VSB = 10…90% VSB nom, Cext < 1 mF
10
20
ms
V
Vi nom , 0 to 100% ISB nom
13.2
3000
0
µF
6.
Figure 2. Efficiency vs. Output Power
7.
The output return path serves as power and signal ground. All output voltages and signals are referenced to these pins.
To prevent a shift in signal and voltage levels due to ground wiring voltage drop a low impedance ground plane should be used as
shown in Figure 3. Alternatively, separated ground signals can be used as shown in Figure 4. In this case the two ground planes
should be connected together at the power supplies ground pins.
Figure 3. Common low impedance ground plane
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PET2000-12-074xD
Figure 4. Separated power and signal ground
Due the unit has no Input Earth Connector Terminal on the front of the unit it is mandatory to have a reliable system output
GND to Earth connection.
Figure 5. Block diagram with reliable System Earth connection
8.
General Condition: TA = 0…40 °C (PET2000-12-074RD), TA = 0…55 °C (PET2000-12-074ND), unless otherwise noted.
PARAMETER
DESCRIPTION / CONDITION
MIN
13.6
13.6
169
NOM
80
MAX
UNIT
A
F
Input Fuse (L)
Not use accessible, fast acting
V1 OV
OV Threshold V1
OV Trip Time V1
OV Threshold VSB
OV Trip Time VSB
14.3
14.5
1
VDC
ms
VDC
ms
ADC
s
Over Voltage V1 Protection, Latch-off Type
tV1 OV
VVSB OV
tVSB OV
14.3
20
14.5
1
Over Voltage V1 Protection, Automatic retry each 1s
Over Current Limitation, Latch-off, Vi min to Vi max
Over Current Limitation, Latch-off time
Fast Over Current Limit. Latch-off, Vi min to Vi max
Fast Over Current Limitation, Latch-off time
V1 < 3 V, time until IV1 is limited to < IV1 sc
Over Current Limitation, Constant-Current Type
Over Current Limit., time until IVSB is limited to IVSB OC
Automatic shut-down
175
IV1 OC Slow
OC Limit V1
IV1 OC Fast
tV1 OC Fast
IV1 SC
Fast OC Limit V1
176
50
ADC
ms
A
Fast OC Trip time V1
Max Short Circuit Current V1
Short Circuit Regulation Time
OC Limit VSB
60
180
2
tV1 SC
ms
A
IVSB OC
tVSB OC
TSD
6
OC Trip time VSB
1
ms
°C
Over Temperature on Heat Sinks
Over voltage trip
115
OVP
Vi min to Vi max
13.6
15.0
V
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PET2000-12-074xD
8.1 OVERVOLTAGE PROTECTION
The PET2000-12-074xD front-end provides a fixed threshold overvoltage (OV) protection implemented with a HW comparator
for both the main and the standby output. Once an OV condition has been triggered on the main output, the supply will shut
down and latch the fault condition. The latch can be unlocked by disconnecting the supply from the DC supply or by toggling
the PSON_L input. The standby output will continuously try to restart with a 1 s interval after OV condition has occurred.
8.2 UNDERVOLTAGE DETECTION
Both main and standby outputs are monitored. LED and PWOK_H pin signal if the output voltage exceeds ±5% of its nominal
voltage.
The main output will latch off if the main output voltage V1 falls below 10 V (typically in an overload condition) for more than
55 ms. The latch can be unlocked by disconnecting the supply from the DC supply or by toggling the PSON_L input.
If the standby output leaves its regulation bandwidth for more than 2 ms then the main output is disabled to protect the system.
8.3 CURRENT LIMITATION
MAIN OUTPUT
The main output exhibits a substantially rectangular output characteristic controlled by a software feedback loop. If output
current exceeds IV1 OC Fast it will reduce output voltage in order to keep output current at IV1 OC Fast. If the output voltage drops
below ~10.0 VDC for more than 55 ms, the output will latch off (standby remains on).
The latch can be unlocked by disconnecting the supply from the DC mains or by toggling the PSON_L input. The main output
current limitation thresholds depend on the actual input applied to the power supply.
STANDBY OUTPUT
The standby output exhibits a substantially rectangular output characteristic down to 0 V (no hiccup mode / latch off).
The current limitation of the standby output is independent of the DC input voltage.
Running in current limitation causes the output voltage to fall, this will trigger under voltage protection and disables the
main output.
9.
The power supply operating parameters can be accessed through I2C interface. For more details refer to chapter I2C / PMBus®
COMMUNICATION and document URP.00234 (PET2000-12-074 PMBus® Communication Manual).
PARAMETER
Vi mon
Ii mon
Pi mon
V1 mon
DESCRIPTION / CONDITION
Vi min LL ≤ Vi ≤ Vi max
MIN
-2
NOM
MAX
+2
UNIT
VDC
%
Input Voltage
Input Current
True Input Power
V1 Voltage
Ii > 5.8 A
-10
-10
-0.2
-2
+10
+10
+0.2
+2
Pi > 250 W
%
VDC
%
I1 > 50A
I1 mon
V1 Current
5 A < I1 ≤ 50 A
Pi > 1000 W
-0.5
-1
+0.5
+1
ADC
%
P1 nom
V1 Output Power
50 W < Pi ≤ 1000 W
-10
-0.2
-0.2
-5
+10
+0.2
+0.2
+5
W
VSB mon
ISB mon
TA mon
VSB Voltage
VDC
ADC
°C
VSB Current
Inlet Temperature
T
A min ≤ TA ≤ TA max
2
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PET2000-12-074xD
10.
10.1
ELECTRICAL CHARACTERISTICS
PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
PSON_H / HOTSTANDBYEN_H
PSON_L: Main output enabled
VIL
VIH
Input Low Level Voltage
Input High Level Voltage
-0.2
0.8
V
V
HOTSTANDBYEN_H: Hot Standby mode
not allowed
PSON_L: Main output disabled
2
3.5
1
HOTSTANDBYEN_H: Hot Standby mode
allowed
IIL,H
Maximum Input Sink or Source Current
Internal Pull up Resistor to internal 3.3 V
VI = -0.2 V to +3.5 V
-1
mA
Rpull up
10
kΩ
Maximum external Pull down Resistance
to GND to obtain Low Level
Minimum external Pull down Resistance
to GND to obtain High Level
RLOW
RHIGH
1
kΩ
kΩ
50
PWOK_H
VOL
Output Low Level Voltage
V1 or VSB out of regulation, VIsink < 4 mA
V1 and VSB in regulation, Isource < 0.5 mA
0
0.4
3.5
V
V
VOH
Output High Level Voltage
Internal Pull up Resistor to internal 3.3 V
Maximum Sink Current
2.4
Rpull up
IOL
1
kΩ
mA
VO < 0.4 V
4
10.2
SENSE INPUTS
The main output has sense lines implemented to compensate for voltage drop on load wires in both positive and negative
path. The maximum allowed voltage drop is 200 mV on the positive rail and 100 mV on the GND rail.
With open sense inputs the main output voltage will rise by 270 mV. Therefore, if not used, these inputs should be connected
to the power output and GND at the power supply connector. The sense inputs are protected against short circuit. In this case
the power supply will shut down.
10.3
CURRENT SHARE
The PET front-ends have an active current share scheme implemented for V1. All the ISHARE current share pins need to be
interconnected in order to activate the sharing function. If a supply has an internal fault or is not turned on, it will disconnect
its ISHARE pin from the share bus. This will prevent dragging the output down (or up) in such cases.
The current share function uses an analog bus to transmit and receive current share information. The controller implements a
Master/Slave current share function. The power supply providing the largest current among the group is automatically the
Master. The other supplies will operate as Slaves and increase their output current to a value close to the Master by slightly
increasing their output voltage. The voltage increase is limited to +250 mV.
The standby output uses a passive current share method (droop output voltage characteristic).
10.4
PSON_L INPUT
The PSON_L is an internally pulled-up (3.3 V) input signal to enable/disable the main output V1 of the front-end.
With low level input the main output is enabled. This active-low pin is also used to clear any latched fault condition.
The PSON_L can be either controlled by an open collector device or by a voltage source.
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PET2000-12-074xD
PSU 1 PDU
PSU 1 PDU
3.3V
3.3V
PSON_L
PSON_L
PSU 2
PSU 2
3.3V
3.3V
PSON_L
PSON_L
Figure 6. PSON_L connection
10.5
PWOK_H OUTPUT
The PWOK_H is an open drain output with an internal pull-up to 3.3 V indicating whether both VSB and V1 outputs are within
regulation. This pin is active-low.
PSU PDU
PSU PDU
3.3V
3.3V
3.3V
≥1kΩ
PWOK_H
PWOK_H
>10kΩ
PSU 1 PDU
PSU 1 PDU
3.3V
3.3V
3.3V
≥1kΩ
PWOK_H
PWOK_H
PSU 2
PSU 2
3.3V
3.3V
PWOK_H
PWOK_H
Figure 7. PWOK_H connection
10.6
PRESENT_L OUTPUT
The PRESENT_L pin is wired through a 100 Ohms resistor to internal GND within the power supply. This pin does indicate that
there is a power supply present in this system slot. An external pull-up resistor has to be added within the application. Current
into PRESENT_L should not exceed 5mA to guarantee a low level voltage if power supply is seated.
PSU PDU
Vext
PRESENT_L
100Ω
Figure 8. PRESENT_L connection
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PET2000-12-074xD
10.7
SIGNAL TIMING
DC
Input
DC
Input
tDC drop2
VSB
tV1 holdup
VSB
tV1 rise
tVSB rise
tDC VSB
tV1 off
V1
tDC drop1
V1
tVSB V1 del
PSON_L
tPWOK_H holdup
tDC V1
PSON_L
PWOK_H
tPWOK_H warn
tPWOK_H del
PWOK_H
Figure 9. DC turn-on timing
Figure 10. DC short dips
DC
DC
Input
Input
tPSON_L PWOK_H
tPSON V1 off
tVSB holdup
tV1 holdup
tVSB off
VSB
VSB
tPSON_L V1 on
tV1 rise
tV1 off
tV1 off
V1
V1
tPWOK_H low
tPWOK_H holdup
tPWOK_H warn
PSON_L
PWOK_H
PSON_L
PWOK_H
tPWOK_H del
tPWOK_H warn
Figure 11. DC long dips
Figure 12. PSON_L turn-on/off timing
DESCRIPTION /
CONDITION
PARAMETER
MIN
50
5
NOM
MAX
UNIT
TDC VSB
tAC V1
tVSB V1 del
tV1 rise
DC Line to 90% VSB
DC Line to 90% V1
VSB to V1 delay
V1 rise time
3
5 3
s
s
PSON_L = Low
PSON_L = Low
1000
ms
See chapter OUTPUT
See chapter OUTPUT
tVSB rise
VSB rise time
DC drop from Vi = 48 VDC, without V1 leaving
regulation
DC drop without VSB leaving regulation
Loss of DC to V1 leaving regulation
Loss of DC to V1 leaving regulation
Outputs in regulation to PWOK_H asserted
TDC drop1
I1 nom, ISB nom
5.5
6
ms
TDC drop2
tV1 holdup
tVSB holdup
tPWOK_H del
I1 nom, ISB nom
10
5
ms
ms
ms
ms
See chapter INPUT
See chapter INPUT
10
5
400
Warning time from de-assertion of PWOK_H to V1
leaving regulation
tPWOK_H warn
0.15
ms
tPWOK_H holdup
tPWOK_H low
tPSON_L V1 on
tPSON_L V1 off
tPSON_L PWOK_H
tV1 off
Loss of DC to PWOK_H de-asserted
2
100
5
ms
ms
ms
ms
ms
s
Time PWOK_H is kept low after being de-asserted
Delay PSON_L active to V1 in regulation
Delay PSON_L de-asserted to V1 disabled
Delay PSON_L de-asserted to PWOK_H de-asserted
Time V1 is kept off after leaving regulation
Time VSB is kept off after leaving regulation
400
4
TBD
1
1
tVSB off
s
3 At repeated ON-OFF cycles the start-up times can be increased by 1 s
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PET2000-12-074xD
10.8
LED INDICATOR
The front-end has one front LED showing the status of the supply. The LED is bi-colored: green and amber, and indicates
DC input and DC output power presence and warning or fault conditions. Table 1 below lists the different LED status.
OPERATING CONDITION 4
LED SIGNALING
No Vi or DC Line in UV condition, VSB not present from paralleled power supplies
PSON_L High
Off
Blinking Green 1 Hz
No DC or ADC Line in UV condition, VSB present from paralleled power supplies
V1 or VSB out of regulation
Over temperature shutdown
Solid Amber
Output over voltage shutdown (V1 or VSB
)
Output over current shutdown (V1 or VSB
Fan error (>15%)
)
Over temperature warning
Blinking Amber 1 Hz
Minor fan regulation error (>5%, <15%)
Firmware boot loading in process
Outputs V1 and VSB in regulation
Blinking Green 2 Hz
Solid Green
Table 1. LED Status
4 The order of the criteria in the table corresponds to the testing precedence in the controller
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PET2000-12-074xD
11.
The PET front-end is a communication Slave device only; it never initiates messages on the I2C/SMBus by itself. The
communication bus voltage and timing is defined in Table 2 and further characterized through:
3.3V
3.3/5V
•
•
The SDA/SCL IOs use 3.3 V logic levels
External pull-up resistors on SDA/SCL required for correct
signal edges
Full SMBus clock speed of 100 kbps
Clock stretching limited to 1 ms
RX
TX_EN
TX
10kΩ
Rpull-up
SDA/SCL
•
•
•
•
DSP or EEPROM
SCL low time-out of >25 ms with recovery within 10 ms
Recognizes any time Start/Stop bus conditions
Figure 13. Physical Layer of Communication Interface
Communication to the DSP or the EEPROM will be possible as long as the input DC voltage is provided. If no DC is present,
communication to the unit is possible as long as it is connected to a life VSB output (provided e.g. by the redundant unit).
If only V1 is provided, communication is not possible.
PARAMETER
DESCRIPTION
CONDITION
MIN
MAX
UNIT
SCL / SDA
ViL
Input low voltage
-0.5
2.3
1.0
3.5
V
V
ViH
Input high voltage
Vhys
Input hysteresis
0.15
V
VoL
Output low voltage
3 mA sink current
0
0.4
V
1
1
tr
Rise time for SDA and SCL
Output fall time ViHmin ViLmax
Input current SCL/SDA
20+0.1Cb
20+0.1Cb
-10
300
ns
ns
μA
pF
kHz
Ω
tof
10 pF < Cb1 < 400 pF
250
Ii
0.1 VDD < Vi < 0.9 VDD
10
50
Ci
Internal Capacitance for each SCL/SDA
SCL clock frequency
fSCL
0
100
1
Rpull-up
tHDSTA
tLOW
tHIGH
tSUSTA
tHDDAT
tSUDAT
tSUSTO
tBUF
External pull-up resistor
Hold time (repeated) START
Low period of the SCL clock
High period of the SCL clock
Setup time for a repeated START
Data hold time
f
f
f
f
f
f
f
f
f
SCL ≤ 100 kHz
SCL ≤ 100 kHz
SCL ≤ 100 kHz
SCL ≤ 100 kHz
SCL ≤ 100 kHz
SCL ≤ 100 kHz
SCL ≤ 100 kHz
SCL ≤ 100 kHz
SCL ≤ 100 kHz
1000 ns / Cb
μs
μs
μs
μs
μs
ns
μs
ms
4.0
4.7
4.0
4.7
0
3.45
Data setup time
250
4.0
5
Setup time for STOP condition
Bus free time between STOP and START
1 Cb = Capacitance of bus line in pF, typically in the range of 10…400 pF
Table 2. I2C / SMBus Specification
tof
tLOW
tHIGH
tLOW
tr
SCL
SDA
tSUSTA
tHDSTA
tHDDAT tSUDAT
tSUSTO
tBUF
Figure 14. I2C / SMBus Timing
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PET2000-12-074xD
ADDRESS SELECTION
The address for I2C communication can be configured by pulling address input pins A1 and A0 either to GND (Logic Low) or
leave them open (Logic High). An internal pull up resistor will cause the A1 / A0 pin to be in High Level if left open.
A fixed addressing offset exists between the Controller and the EEPROM.
I2C Address 1)
A2 2)
A1
A0
Controller
EEPROM
0
1
0
1
0
1
0
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0xB0
0xB2
0xB4
0xB6
0xB8
0xBA
0xBC
0xBE
0xA0
0xA2
0xA4
0xA6
0xA8
0xAA
0xAC
0xAE
1) The LSB of the address byte is the R/W bit.
2) A2 is used on the standard model only.
On special models (e.g. PET2000-12-074ND020) the connector PIN is used for IN_OK functionality.
These models have only two addressing pins A0 and A1. A2 is set to 0 inside firmware by default.
Table 3. Address and Protocol Encoding
11.1
SMBALERT_L OUTPUT
The SMBALERT_L signal indicates that the power supply is experiencing a problem that the system agent should investigate.
This is a logical OR of the Shutdown and Warning events. It is asserted (pulled Low) at Shutdown or Warning events such as
reaching temperature warning/shutdown threshold of critical component, general failure, over-current, over-voltage, under-
voltage or low-speed of failed fan. This signal may also indicate the power supply is operating in an environment exceeding
the specified limits.
The SMBAlert signal is asserted simultaneously with the LED turning to solid amber or blinking amber.
PARAMETER
SMB_ALERT_L
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
Vext
IOH
Maximum External Pull up Voltage
12
10
V
µA
V
Maximum High Level Leakage Current
Output Low Level Voltage
No Failure or Warning condition, VO = 12 V
Failure or Warning condition, Isink < 4 mA
VOL
0
0.4
Rpull up
IOL
Internal Pull up Resistor to internal 3.3 V
Maximum Sink Current
None
VO < 0.4 V
4
mA
PSU 1 PDU
3.3V
≥1kΩ
SMB-
ALERT_L
PSU 2
SMB-
ALERT_L
Figure 15. SMBALERT_L connection
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PET2000-12-074xD
11.2
CONTROLLER AND EEPROM ACCESS
The controller and the EEPROM in the power supply share the same I2C bus physical layer (see Figure 16) and can be
accessed under different addresses, see ADDRESS SELECTION. The SDA/SCL lines are connected directly to the controller
and EEPROM which are supplied by internal 3.3 V.
The EEPROM provides 256 bytes of user memory. None of the bytes are used for the operation of the power supply.
Address Selection
A2..0
SDA
DSP
SCL
EEPROM
Protection
Figure 16. I2C Bus to DSP and EEPROM
11.3
EEPROM PROTOCOL
The EEPROM follows the industry communication protocols used for this type of device. Even though page write / read
commands are defined, it is recommended to use the single byte write / read commands.
WRITE
The write command follows the “SMBus 1.1 Write Byte Protocol”. After the device address with the write bit cleared, the Two
Byte Data Address is sent followed by the data byte and the STOP condition. A new START condition on the bus should only
occur after 5ms of the last STOP condition to allow the EEPROM to write the data into its memory.
READ
The read command follows the “SMBus 1.1 Read Byte Protocol”. After the device address with the write bit cleared the two
byte data address is sent followed by a repeated start, the device address and the read bit set. The EEPROM will respond with
the data byte at the specified location.
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PET2000-12-074xD
11.4
PMBus® PROTOCOL
The Power Management Bus (PMBus®) is an open standard protocol that defines means of communicating with power
conversion and other devices. For more information, please see the System Management Interface Forum web site at:
www.powerSIG.org.
PMBus® command codes are not register addresses. They describe a specific command to be executed.
The PET2000-12-074ND supply supports the following basic command structures:
•
•
•
Clock stretching limited to 1 ms
SCL low time-out of >25 ms with recovery within 10 ms
Recognized any time Start/Stop bus conditions
WRITE
The write protocol is the SMBus 1.1 Write Byte/Word protocol. Note that the write protocol may end after the command byte
or after the first data byte (Byte command) or then after sending 2 data bytes (Word command).
S
Address
W
A
A
Command
A
A
Data Low Byte1)
Data High Byte1)
P
1) Optional
In addition, Block write commands are supported with a total maximum length of 255 bytes. See PET2000-12-074NA /
PET2000-12-074ND PMBus® Communication Manual URP.00234 for further information.
S
Address
Byte 1
W
A
A
Command
A
Byte Count
Byte N
A
A
P
READ
The read protocol is the SMBus 1.1 Read Byte/Word protocol. Note that the read protocol may request a single byte or word.
S
Address
W
R
A
A
Command
A
A
S
Address
Data (Low) Byte
Data High Byte1) nA
P
1) Optional
In addition, Block read commands are supported with a total maximum length of 255 bytes.
See PET2000-12-074NA/ PET2000-12-074ND PMBus® Communication Manual URP.00234 for further information.
S
Address
W
A
A
Command
Byte 1
A
S
Address
Byte N
R
A
Byte Count
A
nA P
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PET2000-12-074xD
11.5
GRAPHICAL USER INTERFACE
The Bel Power Solutions provides with its “I2C Utility” a Windows® XP/Vista/Win7 compatible graphical user interface allowing
the programming and monitoring of the PET2000-12-074xD Front-End. The utility can be downloaded on:
www.belpowersolution.com and supports both the PSMI and PMBus® protocols.
The GUI allows automatic discovery of the units connected to the communication bus and will show them in the navigation
tree. In the monitoring view the power supply can be controlled and monitored.
If the GUI is used in conjunction with the YTM.00046 Evaluation Board it is also possible to control the PSON_L pin(s) of the
power supply.
Further there is a button to disable the internal fan for approximately 10 seconds. This allows the user to take input power
measurements without fan consumptions to check efficiency compliance to the Climate Saver Computing Platinum
specification.
The monitoring screen also allows to enable the hot-standby mode on the power supply. The mode status is monitored and
by changing the load current it can be monitored when the power supply is being disabled for further energy savings.
This obviously requires 2 power supplies being operated as a redundant system (as in the evaluation kit).
NOTE: The user of the GUI needs to ensure that only one of the power supplies have the hot-standby mode enabled.
Figure 17. Monitoring dialog of the I2C Utility
12.
To achieve best cooling results sufficient airflow through the supply must be ensured. Do not block or obstruct the airflow at the
rear of the supply by placing large objects directly at the output connector. The PET2000-12-074ND is provided with a rear to front
airflow, which means the air enters through the DC-output of the supply and leaves at the DC-inlet. The PET2000-12-074RD is
provided with a front to rear airflow, which means the air enters through the DC-input of the supply and leaves at the DC-output.
The PET2000-12-074xD power supply has been designed for horizontal operation.
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PET2000-12-074xD
Airflow
Figure 18. Airflow direction PET2000-12-074ND
Airflow
Figure 19. Airflow direction PET2000-12-074RD
The fan inside of the supply is controlled by a microprocessor. The rpm of the fan is adjusted to ensure optimal supply cooling and
is a function of output power and the inlet temperature. Figure 20 illustrates the programmed fan curves.
Figure 20. Fan speed vs. main output load
The PET2000-12-074ND provides access via I2C to the measured temperatures of sensors within the power supply, see Table 4.
The microprocessor is monitoring these temperatures and if warning threshold of one of these sensors is reached it will set fan to
maximum speed. If temperatures continue to rise above shut down threshold the main output V1 (or VSB if auxiliary converter is
affected) will be disabled. At the same time, the warning or fault condition is signalized accordingly through LED, PWOK_H and
SMBALERT_L.
PMBUS
REGISTER
WARNING
THRESHOLD
SHUT DOWN
THRESHOLD
TEMPERATURE SENSOR
DESCRIPTION / CONDITION
PET2000-12-074ND
Sensor located on control board close to DC end of
67°C
70°C
power supply (card edge connector)
Inlet Air Temperature
Ox8D
PET2000-12-074RD
52°C
55°C
Sensor located next to the fan of power supply
Synchronous Rectifier
Primary Heat Sink
Sensor located on secondary side of DC/DC stage
0xD6
0x8E
95°C
95°C
105°C
105°C
Sensor located next to the heat sink
Table 4. Temperature sensor location and thresholds
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PET2000-12-074xD
13.
For safety compliant operation the power supply needs to be operating inside the specified operating conditions.
The PET2000-12-074xD modules have different power derating behavior which are mainly dependent on the air flow direction and
the ambient conditions.
PET2000-12-074ND
Between 0°C and 55°C power supply is only depending on AC input altitude. Above 55°C the maximum output power is further reduced
with rising temperature. Figure 21 illustrates these maximum current and power levels.
PET2000-12-074ND
PET2000-12-074ND
180
160
140
120
100
80
2000
1800
1600
1400
1200
1000
800
600
400
200
0
60
40
20
0
45
55
65
75
45
50
55
60
65
70
75
Ambient Temperature [°C]
Ambient Temperature [°C]
Figure 21. Maximum current and power levels PET2000-12-074ND
PET2000-12-074RD
Between 0°C and 40°C power supply is only depending on AC input altitude. Above 40°C the maximum output power is further
reduced with rising temperature. Figure 22 illustrates these maximum current and power levels.
PET2000-12-074RD
PET2000-12-074RD
2000
1800
1600
160
167
2000
140
150
1800
120
100
80
60
40
20
0
1400
1200
1000
800
600
400
200
0
100
1200
0
0
30
35
40
45
50
55
60
35
40
45
50
55
60
Ambient Temperature [°C]
Ambient Temperature [°C]
Figure 22. Maximum current and power levels PET2000-12-074RD
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19
PET2000-12-074xD
14.
14.1 IMMUNITY
PARAMETER
DESCRIPTION / CONDITION
CRITERION
IEC / EN 61000-4-2, ±8 kV, 25+25 discharges per test point (metallic case, LED,
connector body)
ESD Contact Discharge
A
IEC / EN 61000-4-2, ±15 kV, 25+25 discharges per test point (non-metallic user
accessible surfaces)
IEC / EN 61000-4-3, 10 V/m, 1 kHz/80% Amplitude Modulation, 1µs Pulse
Modulation, 10 kHz ... 2 GHz
IEC / EN 61000-4-4, Level 3
ESD Air Discharge
Radiated Electromagnetics Filed
Burst
A
A
A
DC input port ±2 kV, 1 minute
IEC / EN 61000-4-5 ; NEBS GR-1089-CORE Issue 6
Common mode: ±1 kV (2 Ohm)
Differential mode : ±1 kV (2 Ohm)
Surge
A
A
RF Conducted Immunity
IEC / EN 61000-4-6, Level 3, 10 Vrms, CW, 0.1 … 80 MHz
14.2 EMISSION
PARAMETER
DESCRIPTION / CONDITION
CRITERION
EN 55022 / CISPR 22: 0.15 … 30 MHz, QP and AVG,
single power supply
Conducted Emission
Class A - 6 dB
EN 55022 / CISPR 22: 30 MHz … 1 GHz, QP,
single power supply
Radiated Emission
Acoustical Noise
Class A - 6 dB
65 dBA
Distance at bystander position, 25°C, 50% Load
15.
Maximum electric strength testing is performed in the factory according to IEC/EN 60950, and UL 60950. Input-to-output electric
strength tests should not be repeated in the field. Bel Power Solutions will not honor any warranty claims resulting from electric
strength field tests.
PARAMETER
DESCRIPTION / CONDITION
NOTE
UL 60950-1 2nd Edition
CAN/CSA-C22.2 No. 60950-1-07 2nd Edition
IEC 60950-1: 2005
EN 62368-1: 2014
Agency Approvals
EN 60950-1: 2006
Approved
EN 62368-1: 2014
NEMKO NO P16221006, NO P18222683
EAC NO 0324871,
CQC NO CQC16001147490
Input plus to chassis; 1414V for 1 minute
Basic
Basic
Input minus to chassis; 1414V for 1 minute
Isolation Strength
None
(Direct connection)
Output to chassis
Primary to chassis (PE)
Primary to secondary
Creepage / Clearance
>2 mm
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PET2000-12-074xD
16.
PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
Up to 1’000m ASL, PET2000-12-074ND
Up to 1’000m ASL, PET2000-12-074RD
Linear derating from 1’000 to 3’048 m ASL
PET2000-12-074ND
PET2000-12-074RD
PET2000-12-074ND
-5
-5
+55
+40
°C
°C
TA
Ambient Temperature
+45
+30
70
°C
°C
°C
°C
TAext
TS
Extended Temp. Range
Storage Temperature
PET2000-12-074RD
55
Non-operational
-20
+70
3’048
10’600
1
°C
Operational, above Sea Level
Non-operational, above Sea Level
-
-
m
Altitude
m
Shock, operational
g peak
g peak
g peak
g peak
Grms
Half sine, 11ms, 10 shocks per direction,
6 directions
Shock, non-operational
30
Vibration, sinusoidal, operational
Vibration, sinusoidal, non-operational
1
IEC/EN 60068-2-6, sweep 5 to 500 to 5 Hz, 1
octave/min, 5 sweep per axis
4
Vibration, random, operational
7.7grms 30min, 3 axes operational
7.7
Vibration, random, non-operational
IEC/EN 60068-2-64, 5 to 500 Hz, 1 hour per axis
0.025
g2/Hz
17.
PARAMETER
MTBF Mean time to failure
DESCRIPTION / CONDITION
According Bellcore TR-TSY-000332, Issue 3
TA = 25°C, Vi = 48 VDC, 0.5 ∙ I1 nom, ISB nom
MIN
NOM
MAX
UNIT
683
kh
TA = 25°C, Vi = 48 VDC, 0.7 ∙ I1 nom, ISB nom
7
2
Expected life time
years
TA = 55°C, Vi = 48 VDC, I1 nom, ISB nom
18.
PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
73.5
40.0
265.0
1.2
MAX
UNIT
mm
mm
mm
kg
Width
Heigth
Depth
Dimensions *
m
Weight
* Dimensions in mm, tolerances acc. ISO 2768 ()-H, unless otherwise stated: 0.5-30: ±0.2; 30-120: ±0.3; 120-400: ±0.5
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21
PET2000-12-074xD
Figure 23. Top and side view with the connector added
V1
Power supply
rear view
GND
I2C
VSB
Card edge PCB
GND
within power supply
Digital I/O
Analog I/O
Reserved
S13
S12
S24 P19
S1 P18
P28 P29
P11 P10
P36
P1
Mating connector,
soldered onto application
backplane
S12
S1
P18
P19
P1
Application backplane,
top view
S13
S24
P36
Figure 25. Rear view
Figure 24. Front view
A screw added on the PET2000-12-074xD side prevents the unit from being inserted into system with standard INTEL connector.
Systems using PET2000-12-074xD must have a slot of ø6 mm x 14 mm implemented to allow the unit to be inserted. The maximum
size of the screw head is ø6mm and height 2.12 mm.
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PET2000-12-074xD
Figure 26. Polarizing screw
19.
PARAMETER
DESCRIPTION / CONDITION
Receptacle: Amphenol # C10-730138-000, 3.6 mm
MIN
NOM
MAX
UNIT
Plug:
Amphenol # C10-747100-000, for 6 AWG (black)
Amphenol # C10-638974-000, for 6 AWG (gray)
Amphenol # C10-747442-000, for 4 AWG (black)
DC inlet
Input wire harness (with black plug):
Amphenol # CR-302001-257
DC diameter requirement
Output connector
Wire size
6
4
AWG
25-Pin PCB card edge
Manufacturer: FCI Electronics
Manufacturer P/N: 10130248-005LF
(see Figure 27 for option x)
Mating output connector
BEL P/N: ZES.00678
PIN
P1 ~ P10
P29 ~ P36
P11 ~ P18
P19 ~ P28
S1
SIGNAL NAME
DESCRIPTION
GND
Power and signal ground (return)
GND
V1
+12 VDC main output
V1
A0
I2C address selection input
S2
A1
S3, S4,
S21, S22
VSB
+12 V Standby positive output
S5
S6
S7
S8
HOTSTANDBYEN_H
ISHARE
Hot standby enable signal, active-high
Analog current share bus
Reserved
For future use, keep open circuit
Power supply seated, active-low
PRESENT_L
A2
or
I2C address selection input (on standard models)
or
S9
IN_OK
Input voltage OK signal output, active-high (e.g. For PET2000-12-074ND0200)
S10 ~ S15
S16
GND
PWOK_H
V1_SENSE
V1_SENSE_R
SMB_ALERT_L
PSON_L
Power and signal ground (return)
Power OK signal output, active-high
Main output positive sense
Main output negative sense
SMB Alert signal output, active-low
Power supply on input, active-low
I2C clock signal line
S17
S18
S19
S20
S23
SCL
S24
SDA
I2C data signal line
Table 5. Output connector pin assignment
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PET2000-12-074xD
Figure 27. Mating connector drawing page 1
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PET2000-12-074xD
Figure 28. Mating connector drawing page 2
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25
PET2000-12-074xD
Figure 29. Mating connector drawing page 3
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PET2000-12-074xD
20.
ORDERING PART
SOURCE
ITEM
DESCRIPTION
NUMBER
I2C Utility
Windows XP/Vista/7 compatible GUI
to program, control and monitor
Front-End power supplies (and other
I2C units)
ZS-00130
belfuse.com/power-solutions
Evaluation Board
Connector board to operate
PET2000-12-074NA and
PET2000-12-074ND.
YTM.00046
belfuse.com/power-solutions
Includes an on-board USB to I2C
converter (use I2C Utility as desktop
software).
NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems,
equipment used in hazardous environments, or nuclear control systems.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on
the date manufactured. Specifications are subject to change without notice.
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