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FND850-12DRG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
Interface Signals and Internal Protection
Parameter
Conditions/Description
Min.
Nom.
Max.
Units
Latch-style overvoltage protection.
Overvoltage Protection
Output adjusted to 12V:
Output adjusted to 7V:
14.36
8.37
15.65
9.13
V
Overcurrent Protection
1
Current limit.
12V output (Vin = 44 to 75V)
12V output (Vin = 36 to 44V)
74
61
78
64
85
70
A
Short-Circuit Protection
Standby output:
Power supply to recover when short is removed.
1.1
1.3
1.5
12V output will shut down in the event of an
overtemperature condition or blocked fan rotor.
Supply's fan and Vaux are active. Power
supply will recover when OT condition is
removed. Amber OT LED will turn ON to
Overtemperature/
Fan Failure Warning 1
indicate fault condition.
OT/Fan Fail is an open-collector signal with
20-mA pull-down. High signal indicates a
normal operating condition. Output will go low
at least 100 ms before OT condition shuts down
the power supply. An amber light indicates fan
failure.
TTL open-collector signal with active 20-mA
pull-down. Represents percent of nominal set
DC OK 1
output voltage where signal is OK. Outside of
this percentage, a signal high condition
90
110
%
indicates an output which is out of tolerance.
Green DC OK LED on front panel indicates
normal operation.
TTL open-collector signal with active 20-mA
pull-down. High indicates an input power fail
Input Power Fail
Warning 1
(outside 36-75 VDC). Power Fail Warning will
turn OFF green INPUT OK LED. Represents
4
ms
the time after warning signal before Vout drops
to 95% due to loss of input power.
Power Supply Present
Signal 1
Current Share
Remote Sense
Resistance of connection to logic ground which
allows user to determine if power supply is
present.
Main output only. Difference in current between
two supplies (I Δ < 5% Isum - nom)
Total voltage compensation for cable losses
with respect to the main output.
10
7.1
0.5
?
A
V
Open circuit or logic high from ENA pin to Vo1
RTN shuts OFF Vo1; Vaux and fan are
operational. Logic low (2 mA sink capability) or
Output Enable
jumper will turn ON Vo1 within 100 ms. Open
circuit voltage on enable pin is 3.3 VDC.
Externally applied voltage to the enable pin
should NOT exceed 7 VDC. Signal is referred
to as Logic Return (LRTN).
Also available on I C data line.
1
2
MCD10096 Rev. 1.6, 23-Jul-10
Page 3 of 11
www.power-one.com
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