PET2000-NAS446 is a 2000 Watt AC to DC, power-factor corrected
(PFC) power supply that converts standard AC power into a main
output of +12 VDC.
PET2000-NAS446 utilizes full digital control architecture for greater
efficiency, control and functionality.
The unit includes four 450 mm long cables with 20 pin connectors.
The four connectors are intended to be attached directly to individual
mining load boards.
This power supply meets international safety standards and displays
the CE-Mark for the European Low Voltage Directive (LVD).
• Best-in-class, 80 PLUS “Platinum” Efficiency
• Auto-Selected Input Voltage Ranges: 90 - 140 VAC, 180 - 264 VAC
• AC Input with Power Factor Correction
• 2000 W Continuous Output Power Capability
• Output cable wire harness set included
• Always-On 12 V Standby Output
• Full Digital Controls for Improved Performance
• High Density Design
• Small Form Factor: 73.5 x 40.0 x 331.6 mm (2.89 x 1.57 x 13.05 in)
• Power Management Bus Communication Interface for Control,
Programming and Monitoring
• Status LED with Fault Signaling
• Cryptocurrency Mining
• Blockchain Applications
• Networking Switches
• Servers & Routers
2
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PET
2000
-
N
A
Sxxx
Product Family
Power Level
Dash
Airflow
Input
Suffix
PET Front-Ends
2000 W
N: Normal
(Rear to front)
A: AC
S446:
The PET2000-NAS446 AC/DC power supply is a fully DSP controlled, highly efficient front-end power supply. It incorporates
resonance-soft-switching technology to reduce component stresses, providing increased system reliability and very high efficiency.
With a wide input operational voltage range the PET2000-NAS446 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.
The PFC stage is digitally controlled using a state-of-the-art digital signal processing algorithm to guarantee best efficiency and
unity power factor over a wide operating range.
The DC/DC stage uses soft switching resonant techniques in conjunction with synchronous rectification.
The always-on standby output provides power to external power distribution and management controllers.
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. PET2000-NAS446 Block Diagram
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
CONDITIONS / DESCRIPTION
MIN
MAX
UNITS
Vi maxc
Maximum Input
Continuous
264
VAC
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General Condition: TA = 0… 55 °C, unless otherwise noted.
PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
Vi nom
Nominal Input Voltage
Rated Voltage High Line (
Vi nom HL
)
200
230
240
VAC
Rated Voltage Low Line (
Vi nom LL
)
100
115
127
VAC
Vi
Input Voltage Ranges
Normal operating (
Vi min HL
to
Vi max HL
), High Line
180
264
VAC
Normal operating (
Vi min LL
to
Vi max LL
), Low Line
90
140
VAC
Ii max
Maximum Input Current
Vi
=100 VAC,
I1
= 83 A,
ISB
= 3 A
13
ARMS
Vi
= 200 VAC,
I1
=167 A,
ISB
=3 A (North America)
12
Vi
= 200 VAC,
I1
= 145 A,
ISB
= 3 A (other than North
10
Vi
= 220 VAC,
I1
= 158 A,
ISB
= 3 A (America)
10
Vi
= 230 VAC,
I1
= 167 A,
ISB
= 3 A
10
Ii inrush
Inrush Current Limitation
Vi min
to
Vi max
,
TNTC
= 25°C, 5 ms
10
Ap
fi
Input Frequency
47
50/60
63
Hz
PF
Power Factor
Vi
= 230 VAC, 10% load
0.8
0.88
W/VA
Vi
= 230 VAC, 20% load
0.9
0.95
W/VA
Vi
= 230 VAC, 50% load
0.9
0.997
W/VA
Vi
= 230 VAC, 100% load
0.95
0.999
W/VA
THD
Total Harmonic Distortion
TBD
TBD
%
Vi on
Turn-on Input Voltage1
Ramping up
87
90
VAC
Vi off
Turn-off Input Voltage2
Ramping down
82
87
VAC
η
Efficiency2
Vi
= 230 VAC, 10% load
90
91.6
%
Vi
= 230 VAC, 20% load
91
93.8
%
Vi
= 230 VAC, 50% load
94
94.4
%
Vi
= 230 VAC, 100% load
91
92.8
%
TV1 holdup
Hold-up Time
V1
Vi
= 230 VAC, 50% load, 0°
18
ms
Vi
= 230 VAC, 100% load, 0°
9
ms
TVSB holdup
Hold-up Time
VSB
Vi
= 90 to 264 VAC, 0 to 100% load
70
ms
1
The Front-End is provided with a minimum hysteresis of 3 V during turn-on and turn-off within the ranges
2
Efficiency measured without fan power per EPA server guidelines
4
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TYPE
INPUT CONNECTOR
REGION
APPLIED RATED
MAINS AC VOLTAGE3
MAX
I
4
MAXIMUM
DERATED
I1
AT
MAXIMUM
TA
PET2000-NAS446
IEC 60320-C14
North America
100 to 127 VAC
83 A
50 A at
TA
= 70°C
200 to 240 VAC
167 A
80 A at
TA
= 70°C
Other than
North America
100 to 127 VAC
67 A
17.5 A at
TA
= 65°C
200 to 220 VAC
145 A
32.5 A at
TA
= 65°C
220 to 230 VAC
158 A
40 A at
TA
= 65°C
230 to 240 VAC
167 A
43 A at
TA
= 65°C
3
Nominal grid voltage, does not include typical fluctuations of ±10%; e.g. listed range 230-240 VAC allows operation
at 230 VAC -10% to 240 VAC +10%, so 207 … 264 VAC actual voltage to account for grid fluctuations
4
Maximum Input current for PET2000-NAS446 at
TA
= 55°C
4.1 INPUT CONNECTOR
The PET2000-NAS446 power supply is available with IEC 60320-C14. Outside North America the IEC 60320-C14 has a
limited current of 10 A and is allowed to operate up to 70 °C ambient.
Below table shows the maximum rated operating conditions for the different input connector options. The applied operating
condition must remain within these conditions to allow safety compliant operation.
See also 10.3 MAXIMUM OUTPUT POWER VERSUS INLET TEMPERATURE FOR SAFETY COMPLIANCY for detailed
derating curves.
4.2 INPUT FUSE
Time-lag 16 A input fuse (5 x 20 mm) in series with the L-line inside the power supply protects against severe defects.
The fuse is not accessible from the outside and is therefore not a serviceable part.
4.3 INRUSH CURRENT
The AC-DC power supply exhibits an X-capacitance of only 5.9 μF, resulting in a low and short peak current, when the supply
is connected to the mains. The internal bulk capacitor will be charged through an NTC which will limit the inrush current.
NOTE:
Do not repeat plug-in / out operations within a short time, or else the internal in-rush current limiting device (NTC) may not
sufficiently cool down and excessive inrush current or component failure(s) may result.
4.4 INPUT UNDER-VOLTAGE
If the sinusoidal 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.
4.5 POWER FACTOR CORRECTION
Power factor correction (PFC) is achieved by controlling the input current waveform synchronously with the input voltage.
A fully digital controller is implemented giving outstanding PFC results over a wide input voltage and load ranges.
The input current will follow the shape of the input voltage. If for instance the input voltage has a trapezoidal waveform, then
the current will also show a trapezoidal waveform.
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4.6 EFFICIENCY
High efficiency (see
Figure 2)
is achieved by using state-of-the-art silicon power devices in conjunction with soft-transition
topologies minimizing switching losses and a full digital control scheme. Synchronous rectifiers on the output reduce the
losses in the high current output path. The speed of the fan is digitally controlled to keep all components at an optimal
operating temperature regardless of the ambient temperature and load conditions.
Figure 2. Efficiency vs. Load current (ratio metric loading)
Figure 3. Power factor vs. Load current
Figure 4. Inrush current, Vi = 230Vac, 90°
CH2: Vi (200V/div), CH3: Ii (5A/div)
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PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
V1 nom
Nominal Output Voltage
0.5 ∙
I1 nom
,
TA
= 25°C
12.0
VDC
V1 set
Output Setpoint Accuracy
-0.5
+0.5
%
V1 nom
dV1 tot
Static Regulation
Vi min LL
to
Vi max HL
, 0 to 100%
I1 nom
-1
+1
%
V1 nom
P1 nom
Nominal Output Power5
Vi min HL
to
Vi max HL
2000
W
Vi min LL
to
Vi max LL
1000
W
P1 peak
Peak Output Power6
Vi min HL
to
Vi max HL
2100
W
Vi min LL
to
Vi max LL
110
W
I1 nom
Output Current
Vi min HL
to
Vi max HL
0
167
ADC
I1 nom red
Vi min LL
to
Vi max LL
0
83
ADC
I1 peak
Peak Output Current6
Vi min HL
to
Vi max HL
175
ADC
I1 peak red
Vi min LL
to
Vi max LL
110
ADC
V1 pp
Output Ripple Voltage7
Vi min LL
to
Vi max HL
, 0 to 75%
I1 nom
,
Cext
= 0 mF
120
mVpp
Vi min LL
to
Vi max HL
, 75 to 100%
I1 nom
,
Cext
= 0 mF
150
mVpp
Vi min LL
to
Vi max HL
, 0 to 100%
I1 nom
,
Cext
≥ 1 mF/Low ESR
120
mVpp
dV1 load
Load Regulation
0 to 100%
I1 nom
-30
mV
dV1 line
Line Regulation
Vi min HL
to
Vi max HL
, 0.5 ∙
I1 nom
-24
0
24
mV
dV1 temp
Thermal Drift
0.5 ∙
I1 nom, TA
= 0 ... 55°C
-0.4
mV/°C
dV1 lt
Load Transient Response
Δ
I
1 = 50%
I1 nom
,
I1
= 5 … 100%
I1 nom
,
Cext
= 0 mF
0.35
0.6
VDC
dV1 lt
Δ
I
1 = 10%
I1 nom
,
I1
= 0 … 10%
I1 nom
,
Cext
= 0 mF
0.35
0.6
VDC
trec
Recovery Time
d
I
1/d
t
= 1A/μs, recovery within 1% of
V1 nom
0.5
1
ms
V1 dyn
Dynamic Load Regulation
Δ
I
1 = 60%
I1 nom
,
I1
= 5 … 167 A,
f
= 50 ... 5000 Hz, Duty cycle = 10 ... 90%,
Cext
= 2 ... 30 mF
11.4
12.6
V
tV1 rise
Output Voltage Rise Time
V1
= 10…90%
V1 nom
,
Cext
< 10 mF
1
30
ms
tV1 ovr sh
Output Turn-on Overshoot
0 to 100%
I1 nom
0.6
V
CV1 load
Capacitive Loading
0
30
mF
5
See also chapter TEMPERATURE AND FAN CONTROL
6
Peak combined power for all outputs must not exceed 2100 W; maximum of peak power duration is 20 seconds without asserting
the SMBAlert signal
7
Measured with a 10 uF low ESR capacitor in parallel with a 0.1 uF ceramic capacitor at the point of measurement
5.1 MAIN OUTPUT V1
General Condition: TA = 0…55 °C, Vi = 230 VAC unless otherwise noted.
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PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
VSB nom
Nominal Output Voltage
ISB = 0 A
,
TA
= 25°C
12.1
VDC
VSB set
Output Setpoint Accuracy
-1
+1
%V
SBnom
dVSB tot
Total Regulation
Vi min LL
to
Vi max HL
, 0 to 100%
ISB nom
-5
+1
%V
SBnom
PSB nom
Nominal Output Power
Vi min LL
to
Vi max HL
PET2000-NAS446
36
W
ISB nom
Output Current
Vi min LL
to
Vi max HL
PET2000-NAS446
0
3
ADC
VSB pp
Output Ripple Voltage7
Vi min LL
to
Vi max HL
, 0 to 100%
ISB nom
,
Cext
= 0 mF
120
mVpp
dVSB load
Load Regulation
0 to 100%
ISB nom
PET2000-NAS446
-360
mV
dVSB line
Line Regulation
Vi min HL
to
Vi max HL
,
ISB nom = 0 A
-24
0
24
mV
dVSB temp
Thermal Drift
ISB = 0 A
-0.5
mV/°C
VSB dyn
Load Transient Response
Δ
ISB
= 50%
ISB nom
,
ISB
= 5 … 100%
ISB nom
,
d
ISB
/d
t
= 1A/μs, recovery within 1% of
VSB nom
0.2
0.3
VDC
trec
Recovery Time
Δ
ISB
= 50%
ISB nom
,
ISB
= 5 … 100%
ISB nom
,
d
ISB
/d
t
= 1A/μs, recovery within 1% of
VSB nom
Δ
ISB
= 1A,
ISB
= 0 …
ISB nom
,
f
= 50 ... 5000 Hz,
Duty cycle = 10 ... 90%,
Cext
= 0 ... 5 mF
1
2
ms
VSB dyn
Dynamic Load Regulation
11.4
12.6
V
tVSB rise
Output Voltage Rise Time
VSB
= 10…90%
VSB nom
,
Cext
< 1 mF
1
2
5
ms
tVSB ovr sh
Output Turn-on Overshoot
0 to 100%
ISB nom
0.6
V
CVSB load
Capacitive Loading
0
3100
μF
Figure 5. Turn-On AC Line 230VAC, full load (200ms/div)
CH1: Vin (400V/div) CH2: PWOK_H (5V/div)
CH3: V1 (2V/div) CH4: VSB (2V/div)
Figure 6. Rise time V1 at 230VAC, full load (2ms/div)
CH3: V1 (2V/div)
Figure 7. Rise time VSB at 230VAC, full load (2ms/div)
CH4: VSB (2V/div)
Figure 8. Turn-Off AC Line 230VAC, full load (20ms/div)
CH1: Vin (400V/div) CH2: PWOK_H (5V/div)
CH3: V1 (2V/div) CH4: VSB (2V/div)
5.2 STANBY OUTPUT VSB
General Condition: TA = 0…55 °C, Vi = 230 VAC unless otherwise noted.
8
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Figure 9. Turn-Off AC Line 230VAC, half load (20ms/div)
CH1: Vin (400V/div) CH2: PWOK_H (5V/div)
CH3: V1 (2V/div) CH4: VSB (2V/div)
Figure 10. Short circuit on V1 (10ms/div)
CH3: V1 (2V/div) CH4: I1 (100A/div)
Figure 11. Load transient V1, 83 to 167A (500
μ
s/div)
CH3: V1 (200mV/div) CH4: I1 (50A/div)
Figure 12. Load transient V1, 167 to 83A (500
μ
s/div)
CH3: V1 (200mV/div) CH4: I1 (50A/div)
5.3 OUTPUT GROUND / CHASSIS CONNECTION
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 13
. Alternatively, separated ground signals can be used as shown in
Figure 14.
In this case the two ground planes should be connected together at the power supplies ground pins.
NOTE:
Within the power supply the output GND pins are connected to the Chassis, which in turn is connected to the Protective Earth
terminal on the AC inlet. Therefore, it is not possible to set the potential of the output return (GND) to any other than Protective
Earth potential.
Figure 13. Common low impedance ground plane
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PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
F
Input fuse (L)
Not use accessible, time-lag (T)
16
A
V1 OV
OV Threshold
V1
Over Voltage
V1
Protection, Latch-off Type
13.3
13.9
14.5
VDC
tV1 OV
OV Trip Time
V1
1
ms
VSB OV
OV Threshold
VSB
Over Voltage
V1
Protection, Automatic retry each 1s
13.3
13.9
14.5
VDC
tVSB OV
OV Trip Time
VSB
1
ms
I1 OC Slow
OC Limit
V1
Over Current Limitation, Latch-off,
Vi min HL
to
Vi max HL
175
ADC
Over Current Limitation, Latch-off,
Vi min LL
to
Vi max LL
88
ADC
tV1 OC Slow
OC Trip time
V1
Over Current Limitation, Latch-off time
20
s
IV1 OC Fast
Fast OC Limit
V1
Fast Over Current Limit., Latch-off,
Vi min HL
to
Vi max HL
180
ADC
Fast Over Current Limit., Latch-off,
Vi min LL
to
Vi max LL
115
ADC
tV1 OC Fast
Fast OC Trip time
V1
Fast Over Current Limitation, Latch-off time
55
ms
I1 SC
Max Short Circuit Current
V
1
V1
< 3 V
180
A
tV1 SC
Short Circuit Regulation Time
V1
< 3 V, time until
I1
is limited to <
I1 sc
2
ms
ISB OC
OC Limit
VSB
Over Current Limitation, Constant-Current Type
3.3
5.5
A
tVSB OC
OC Trip time
VSB
Over Current Limit., time until
ISB
is limited to
ISB OC
1
ms
TSD
Over Temperature
See chapter 10.2
°C
Figure 14. Separated power and signal ground
6.1 OVERVOLTAGE PROTECTION
PET2000-NAS446 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 AC mains 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.
6.2 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 AC mains 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.
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PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
Vi mon
Input RMS Voltage
Vi min LL
≤
Vi
≤
Vi max HL
-3
+3
VAC
Ii mon
Input RMS Current
Ii
> 6.7 Arms
-3
+3
%
Ii
≤ 6.7 Arms
-0.2
+0.2
Arms
Pi mon
True Input Power
Pi
> 500 W
-4
+4
%
50 W <
Pi
≤ 500 W
-20
+20
W
V1 mon
V1 Voltage
-0.1
+0.1
VDC
I1 mon
V1 Current
I1
> 50 A
-1
+1
%
5 A <
I1
≤ 50 A
-0.5
+0.5
ADC
P1 nom
V1 Output Power
Pi
> 1000 W
-1
+1
%
50 W <
Pi
≤ 1000 W
-10
+10
W
VSB mon
VSB Voltage
-0.1
+0.1
VDC
ISB mon
VSB Current
-0.1
+0.1
ADC
TA mon
Inlet Temperature
TA min
≤
TA
≤
TA max
-3
+3
°C
6.3 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), see also
Undervoltage Detection.
Figure 15. Current Limitation on V1
at Vi = 90 ... 140
VAC
Figure 16 .Current Limitation on V1
at Vi = 180 … 264
VAC
The power supply operating parameters can be accessed through I2C interface. For more details refer to chapter
I2C / POWER MANAGEMENT BUS COMMUNICATION and document URP.00686 (PET Front-End Power Management Bus
Communication Manual).
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PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
IIL,H
Maximum Input Sink or Source Current
VI
= -0.2 V to +3.5 V
-1
1
mA
Rpull up
Internal Pull up Resistor to internal 3.3 V
10
kΩ
RLOW
Maximum external Pull down Resistance
to GND to obtain Low Level
1
kΩ
RHIGH
Minimum external Pull down Resistance
to GND to obtain High Level
50
kΩ
PWOK_H
VOL
Output Low Level Voltage
V1
or
VSB
out of regulation,
VIsink
< 4 mA
0
0.4
V
VOH
Output High Level Voltage
V1
and
VSB
in regulation
, Isource
< 0.5 mA
2.4
3.5
V
Rpull up
Internal Pull up Resistor to internal 3.3 V
1
kΩ
IOL
Maximum Sink Current
VO
< 0.4 V
4
mA
8.1 ELECTRICAL CHARACTERISTICS
8.2 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.
8.3 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-high.
An external pull down resistor ensures low level when there is no power supply seated. When combining PWOK_H outputs of
several power supplies, circuits as shown in
Figure 17
should be used.
Figure 17. PWOK_H Output
8.4 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 5 mA to guarantee a low level voltage if power supply is seated.
PSU PDU
PRESENT_L
100Ω
Vext
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Figure 18. PRESENT_L connection
8.5 SIGNAL TIMING
AC
Input
VSB
V1
tAC VSB tVSB rise
tV1 rise
tAC V1
tPWOK_H del
tVSB V1 del
PSON_L
PWOK_H
AC
Input
VSB
V1
tV1 holdup
tV1 off
tPWOK_H warn
tAC drop1
tAC drop2
PSON_L
PWOK_H tPWOK_H holdup
Figure 19. AC turn-on timing
Figure 20. AC short dips
AC
Input
VSB
V1
tVSB holdup
tV1 holdup
tV1 off
tVSB off
tPWOK_H warn
PSON_L
PWOK_H
tPWOK_H holdup
VSB
AC
Input
V1
PSON_L
PWOK_H
tPSON_L V1 on
tV1 rise
tPWOK_H del
tPSON_L PWOK_H
tPWOK_H warn
tPSON V1 off
tV1 off
tPWOK_H low
Figure 21. AC long dips
Figure 22. PSON_L turn-on/off timing
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PARAMETER
DESCRIPTION /
CONDITION
MIN
NOM
MAX
UNIT
tAC VSB
AC Line to 90%
VSB
1.5
s
tAC V1
AC Line to 90%
V1
PSON_L = Low
1.5
4 8
s
tVSB V1 del
VSB
to
V1
delay
PSON_L = Low
50
150
1000
ms
tV1 rise
V1
rise time
See chapter
OUTPUT
tVSB rise
VSB
rise time
See chapter
OUTPUT
tAC drop1
AC drop without
V1
leaving regulation
0.5 ∙
I1 nom
,
ISB nom
17
ms
0.7 ∙
I1 nom
,
ISB nom
13
ms
I1 nom
,
ISB nom
5
ms
tAC drop2
AC drop without
VSB
leaving regulation
I1 nom
,
ISB nom
70
ms
tV1 holdup
Loss of AC to
V1
leaving regulation
See chapter
INPUT
tVSB holdup
Loss of AC to
VSB
leaving regulation
See chapter
INPUT
tPWOK_H del
Outputs in regulation to PWOK_H asserted
100
150
200
ms
tPWOK_H warn
Warning time from de-assertion of PWOK_H to
V1
leaving regulation
0.15
ms
tPWOK_H holdup
Loss of AC to PWOK_H de-asserted
Vi nom HL, I1 nom
,
ISB nom
10
ms
tPWOK_H low
Time PWOK_H is kept low after being de-asserted
100
ms
tPSON_L V1 on
Delay PSON_L active to
V1
in regulation
Cext
= 0 mF
5
10
20
ms
tPSON_L V1 off
Delay PSON_L de-asserted to
V1
disabled
2
3
4
ms
tPSON_L PWOK_H
Delay PSON_L de-asserted to PWOK_H de-asserted
1
2
ms
tV1 off
Time
V1
is kept off after leaving regulation
1
s
tVSB off
Time
VSB
is kept off after leaving regulation
1
s
OPERATING CONDITION 9
LED SIGNALING
No AC or AC Line in UV condition,
VSB
not present from paralleled power supplies
Off
PSON_L High
Blinking Green 1 Hz
Hot-Standby Mode
No AC or AC Line in UV condition,
VSB
present from paralleled power supplies
Solid Amber
V
1 or
V
SB out of regulation
Over temperature shutdown
Output over voltage shutdown (
V
1 or
V
SB)
Output over current shutdown (
V
1 or
V
SB)
Fan error (>15%)
Over temperature warning
Blinking Amber 1 Hz
Minor fan regulation error (>5%, <15%)
Firmware boot loading in process
Blinking Green 2 Hz
Outputs V1 and VSB in regulation
Solid Green
Table 1. LED Status
8
At repeated ON-OFF cycles the start-up times may increase by 1s
9
The order of the criteria in the table corresponds to the testing precedence in the controller
8.6 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 AC
and DC power presence and warning or fault conditions.
Table 1
lists the different LED status.
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PARAMETER
DESCRIPTION
CONDITION
MIN
MAX
UNIT
SCL / SDA
V
iL
Input low voltage
-0.5
1.0
V
V
iH
Input high voltage
2.3
3.5
V
V
hys
Input hysteresis
0.15
V
V
oL
Output low voltage
3 mA sink current
0
0.4
V
t
r
Rise time for SDA and SCL
20+0.1Cb1
300
ns
t
of
Output fall time ViHmin → ViLmax
10 pF < Cb1 < 400 pF
20+0.1Cb1
250
ns
I
i
Input current SCL/SDA
0.1 VDD < Vi < 0.9 VDD
-10
10
μA
C
i
Internal Capacitance for each SCL/SDA
50
pF
f
SCL
SCL clock frequency
0
100
kHz
R
pull-up
External pull-up resistor
fSCL ≤ 100 kHz
1000 ns / Cb1
Ω
t
HDSTA
Hold time (repeated) START
fSCL ≤ 100 kHz
4.0
μs
t
LOW
Low period of the SCL clock
fSCL ≤ 100 kHz
4.7
μs
t
HIGH
High period of the SCL clock
fSCL ≤ 100 kHz
4.0
μs
t
SUSTA
Setup time for a repeated START
fSCL ≤ 100 kHz
4.7
μs
t
HDDAT
Data hold time
fSCL ≤ 100 kHz
0
3.45
μs
t
SUDAT
Data setup time
fSCL ≤ 100 kHz
250
ns
t
SUSTO
Setup time for STOP condition
fSCL ≤ 100 kHz
4.0
μs
t
BUF
Bus free time between STOP and START
fSCL ≤ 100 kHz
5
ms
1 Cb = Capacitance of bus line in pF, typically in the range of 10…400 pF
Table 2. I2C / SMBus Specification
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:
• 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
• SCL low time-out of >25 ms with recovery within 10 ms
• Recognizes any time Start/Stop bus conditions
3.3V
Rpull-up
TX
RX
SDA/SCL
3.3V
10kΩ
DSP or EEPROM
TX_EN
Figure 23. Physical layer of communication interface
Communication to the DSP or the EEPROM will be possible as long as the input AC voltage is provided. If no AC 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.
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Figure 24. I2C / SMBus Timing
ADDRESS SELECTION
The address for I2C communication can be configured by pulling address input pins A2, A1 and A0 either to GND
(Logic Low) or leave them open (Logic High). An internal pull up resistor will cause the A2 / A1 / A0 pin to be in High Level if
left open. A fixed addressing offset exists between the Controller and the EEPROM.
A1
A0
I2C Address
Controller
EEPROM
0
0
0xB0
0xA0
0
1
0xB2
0xA2
1
0
0xB4
0xA4
1
1
0xB6
0xA6
Table 3. Address and protocol encoding
PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
SMB_ALERT_L
Vext
Maximum External Pull up Voltage
12
V
IOH
Maximum High Level Leakage Current
No Failure or Warning condition,
VO
= 12 V
10
µA
VOL
Output Low Level Voltage
Failure or Warning condition,
Isink
< 4 mA
0
0.4
V
Rpull up
Internal Pull up Resistor to internal 3.3 V
None
IOL
Maximum Sink Current
VO
< 0.4 V
4
mA
tr
tLOW
tHIGH
tLOW
tHDSTA
tSUSTA tHDDAT tSUDAT tSUSTO tBUF
tof
SDA
SCL
9.1 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 a 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.
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10.1 FAN CONTROL
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-NAS446 is provided with a rear to front
airflow, which means the air enters through the DC-output of the supply and leaves at the AC-inlet side, as shown in
Figure 25
.
The PET2000-NAS446 supply has been designed for horizontal operation.
Figure 25. Airflow direction
PET2000-NAS446
The fan inside 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. Three different curves are selected based on input voltage and inlet temperature. With standby
output loaded the fan speed minimum is limited to ensure enough cooling of circuits providing standby power.
Figure 26
illustrates the programmed fan curve.
Figure 26. Fan speed vs. main output load
Airflow
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TEMPERATURE
SENSOR
DESCRIPTION / CONDITION
POWER
MANAGEMENT
BUS REGISTER
WARNING
THRESHOLD
SHUTDOWN
THRESHOLD
Inlet Air Temperature
Sensor located on control board close to DC end of
PSU
8Dh
73°C
78°C
Synchronous Rectifier
Sensor located on secondary side of DC/DC stage
8Eh
95°C
100°C
Primary Heat Sink
Sensor located on primary heat sink
8Fh
87°C
92°C
Output ORing Element
Sensor located close to output
D2h
100°C
105°C
Auxiliary Converter
Sensor located on secondary side on auxiliary
rectifier
D3h
80°C
85°C
Bridge Rectifier
Sensor located on heat sink for AC rectifier
D4h
86°C
91°C
Table 4. Temperature sensor location and thresholds
Figure 27. Maximum I1 PET2000-NAS446
(IEC 60320-C14)
Figure 28. Maximum P1 PET2000-NAS446
(IEC 60320-C14)
10.2 TEMPERATURE MONITOR AND OVER TEMPERATURE PROTECTION
PET2000-NAS446 provides access via I2C to the measured temperatures of in total 6 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.
10.3 MAXIMUM OUTPUT POWER VERSUS INLET TEMPERATURE FOR SAFETY COMPLIANCY
For safety compliant operation the power supply must not exceed specified operating conditions specified herein.
These operating conditions ensure the input AC connector is operated within its ratings.
Between 0°C and 55°C power supply inlet temperature the maximum allowed output power is only depending on AC input
connector type chosen, regional usage and the applied nominal input AC voltage. Above 55°C the maximum output power is further
reduced with rising temperature.
Figure 27
illustrates the maximum current.
Above 55°C the power supply is adjusting the current limit level
I1 OC Slow
depending on input voltage range (100-127 VAC or 200-
240 VAC) and inlet temperature.
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PARAMETER
DESCRIPTION / CONDITION
CRITERION
ESD Contact Discharge
IEC / EN 61000-4-2, ±8 kV, 25+25 discharges per test point
(metallic case, LED, connector body)
A
ESD Air Discharge
IEC / EN 61000-4-2, ±15 kV, 25+25 discharges per test point
(non-metallic user accessible surfaces)
A
Radiated Electromagnetics Filed
IEC / EN 61000-4-3, 10 V/m, 1 kHz/80% Amplitude Modulation, 1µs
Pulse Modulation, 10 kHz ... 2 GHz
A
Burst
IEC / EN 61000-4-4, Level 3
AC port ±2 kV, 1 minute
A
Surge
IEC / EN 61000-4-5, Level 3
Line to Earth: ±2 kV
Line to Line: ±1 kV
A
RF Conducted Immunity
IEC / EN 61000-4-6, Level 3, 10 Vrms, CW, 0.1 … 80 MHz
A
Voltage Dips and Interruptions
IEC / EN 61000-4-11
Vi 230VAC / 50 Hz, 90% load, Phase 0°, Dip 100% , duration 10 ms
Vi 200VAC / 50 Hz, 70% load, Phase 0°, Dip 30% , duration 500 ms
1. Vi 200VAC / 50 Hz, 100% load, Phase 0°, Dip 20% , duration 10 s
V1
: A,
VSB
: A
V1
: A,
VSB
: A
V1
: A,
VSB
: A
PARAMETER
DESCRIPTION / CONDITION
CRITERION
Conducted Emission
EN 55022 / CISPR 22: 0.15 … 30 MHz, QP and AVG,
single power supply
Class A
6 dB margin
Radiated Emission
EN 55022 / CISPR 22: 30 MHz … 1 GHz, QP,
single power supply
Class A
6 dB margin
Harmonic Emissions
IEC 61000-3-2, Vi = 115 VAC / 60 Hz & 230 VAC / 50 Hz, 100% Load
Class A
AC Flicker
IEC 61000-3-3, Vi = 230 VAC / 50Hz, 100% Load
Pass
Acoustical Noise
Distance at bystander position, 25°C, 50% Load
65 dBA
PARAMETER
DESCRIPTION / CONDITION
NOTES
Agency Approvals
Approved to latest edition of the following standards:
UL/CSA60950-1, IEC60950-1 and EN60950-1.
NEMKO, CB
Approved
Grade of Insulation
Input (L/N) to chassis (PE)
Basic
Input (L/N) to output
Reinforced
Output to chassis
None (Direct connection)
Creepage / Clearance
Primary (L/N) to chassis (PE)
Primary to secondary
Electrical Strength Test
Input to chassis
Input to output (tested by manufacturer only)
Min. 2121 VDC
4242 VDC
11.1 IMMUNITY
11.2 EMISSION
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.
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PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
TA
Ambient Temperature
Up to 1’000 m ASL
-5
+40
+55*
°C
Linear derating from 1’000 to 3’048 m ASL
+35
+45*
°C
TA ext
Extended Temp. Range
Reduced output power10, up to 1’000 m ASL
+55
+70*
°C
Linear derating from 1’000 to 3’048 m ASL
+50
+60*
TS
Storage Temperature
Non-operational
-20
+70
°C
Altitude
Operational, above Sea Level
-
3’048
m
Non-operational, above Sea Level
-
10’600
m
Shock, operational
Half sine, 11ms, 10 shocks per direction,
6 directions
1
g peak
Shock, non-operational
30
g peak
Vibration, sinusoidal, operational
IEC/EN 60068-2-6, sweep 5 to 500 to 5 Hz,
1 octave/min, 5 sweep per axis
1
g peak
Vibration, sinusoidal, non-operational
4
g peak
Vibration, random, non-operational
IEC/EN 60068-2-64, 5 to 500 Hz,
1 hour per axis
0.025
g2/Hz
PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
MTBF
Mean time to failure
TA
= 25°C, according Telcordia SR-332, issue 3, GB,
confidence level = 90%
860
kh
PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
Dimensions
Width
73.5
mm
Heigth
40.0
mm
Depth
331.6
mm
m
Weight
1.1
kg
10
See chapter 10.3
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PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
AC inlet
PET2000-NAS446 : IEC 60320-C14
10
AC cord requirement
Wire size
16
AWG
Output connector on wire
harness (JL1 to JL4)
Two harnesses. Totally 4 pcs 20 pin connectors
(Molex 39-01-2200 or equivalent)
20
PIN
Output connector for
signaling (J4)
Male 14-Pin connector (AMTEK 5BH1SDA88-14G05TU-00 or
equivalent
14
PIN
Output connector for
external FAN
(J7)
Male 4-Pin connector (Molex: 39-31-0040 or equivalent)
Female Mating connector (Molex: 15-06-0045 or equivalent)
4
PIN
PIN
SIGNAL NAME
DESCRIPTION
JL1-1 to JL1-5
V1
(yellow)
+12 VDC main output
JL1-11 to JL1-15
JL2-1 to JL2-5
JL2-11 to JL2-15
JL3-1 to JL3-5
JL3-11 to JL3-15
JL4-1 to JL4-5
JL4-11 to JL4-15
JL1-6 to JL1-10
GND (black)
Power ground (return)
JL1-16 to JL1-20
JL2-6 to JL2-10
JL2-16 to JL2-20
JL3-6 to JL3-10
JL3-16 to JL3-20
JL4-6 to JL4-10
JL4-16 to JL4-20
Table 5. Output pin assignment from Main Wire Harnesses
Figure 34. Output connections
16.1 MATING OUTPUT CONNECTOR SPECIFICATION (on wire two wire harnesses)
J4
JL1, JL2_black (GND), Harness 1
JL3, JL4_black (GND), Harness 2
JL1, JL2_yellow (V1), Harness 1
JL3, JL4_yellow (V1), Harness 2
J7
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PIN
SIGNAL NAME
DESCRIPTION
S1
GND
Signal ground (return)
S2
S3
GND
+12 VDC
S4
S5
SDA
I2C data signal line
S6
SCL
I2C clock signal line
S7
PSON_L
Power supply on input, active-low
S8
PWOK_H
Power OK signal output, active-high
S9
ALARM
(SMB_ALERT_L)
PSU ALARM SIGNAL
SMB Alert signal output, active-low
S10
PRESENT_L
Power supply seated/connected, active-low
S11
FAN TACHO
External Tacho signal from J7-2
for external fan
S12
FAN PWM
External PWM signal from J7-3
for external fan
S13
A0
I2C address selection input
S14
A1
I2C address selection input
PIN
SIGNAL NAME
DESCRIPTION
J7-1
GND
Power ground (return)
J7-2
FAN TACHO
Tacho from external fan
J7-3
FAN PWM
PWM for from external fan
J7-4
12V
+12 VDC
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.
16.2 MATING OUTPUT CONNECTOR SPECIFICATION (Signal connector J4)
16.3 MATING OUTPUT CONNECTOR SPECIFICATION (FAN supply connector J7)
