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SFP450-12BG AC-DC Front-End Data Sheet
12V Output, 450 Watts
Interface Signals and Internal Protection 1
Parameter
Overvoltage Protection
Conditions/Description
Latch-style overvoltage protection.
Min.
Nom.
Max.
15
Units
V
4.3
Overcurrent Protection
Current limit (Latching Mode). 12V output:
Standby output:
38.4
3.2
47.6
6
A
Short-Circuit
Protection
Overtemperature/
Fan Failure Warning
PS_KILL
+12V Current Share
Write Protect
PS A0
SDA
SCL
Tach
AC_OK/H
Present/L
Alert/L
PWROK/H
Latching Mode.
12V output will shut down in the event of an
overtemperature condition or blocked fan rotor.
OT setpoint is 62 ±3 oC. Supply's fan and Vaux
are active. Power supply will recover when OT
condition is removed. Amber OT LED will turn
ON to indicate fault condition.
Output enable. Pulled low on conjunction with PS_ON being pulled low allows V1 to be activated.
PSKILL will cause the PSU to latch off the 12V rail, the latch can be cleared by recycling PSON or
recycling the AC supply.
0 to 8V signal used for active current sharing.
For factory use only.
I 2 C Address.
I 2 C Data line (3.3V).
I 2 C Clock line (3.3V).
Two pulses per fan revolution.
High signal indicates AC is within PSU limits.
100 Ohm resistor internally connected to RTN allowing the PSU to be detected on insertion.
Low signal indicates PSU fan is running below speed or an overtemperature limit was exceeded.
High signal indicates both outputs are within regulation limits.
1
Refer to product specification for internal pull up impedances and timing of these signals.
BCD20030-G Rev. AB1, 15-FEB-10
Page 3 of 9
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