AIF04ZPFC-01NNTL Astec Power, AIF04ZPFC-01NNTL Datasheet - Page 9

• Manufacturer Part Number: AIF04ZPFC-01NNTL
• Manufacturer: Astec Power

DC-DC Converter Module Enable Output (LD ENABLE)
After the PFC power up sequence, the power to the load can be enabled. This can be performed manually or the PFC can
automatically enable the load using the LD ENABLE signal.
Initially the load is disabled and the LD ENABLE (pin 15) is at 0.4V (LOW). When the PFC power up sequence has
completed, the LD ENABLE voltage goes HIGH. And the LD ENABLE will stay high as long as Vin is above 175Vac or
Vout is above 250V, even if PF_ENABLE is in disable mode. (Please see the application example section at P.25 for the
external circuit to interlock the LD-ENABLE from PF_ENABLE)
The LD ENABLE pin is capable of delivering 2.7mA at 1.5V when HIGH. See electrical specifications for exact figures.
Power Fail Warning
If output voltage can not be maintained at the pre-programmed PFW threshold voltage, the PFW (pin 14) will go from
HIGH to LOW.
The output of the PFW signal can drive an opto-coupler to provide an isolated signal from primary side to the secondary
side. The nominal factory set PFW threshold is set at 340V.
MODEL : AIF -
March 2006 REVISION 09
INPUT
VOLTAGE
OUTPUT
VOLTAGE
OUTPUT
VOLTAGE
LD
ENABLE
Depends on external inrush current limit circuit
PFW
PFC Series
LOW
PFWThreshold
t
 on
Technical Reference Note
Outputstabilized
HIGH
AIF - PFC Power Factor
Correction Series
SH 9 of 31