Specifications

12
1-800-927-9474
20-4
PFC Interface Connections (cont)
Signal Ground (J10-10)
Signal Ground on J10-10 is an isolated secondary ground reference for all J10 interfacing
signals, and for ModuPAC output status signals such as Power Good. This is not the same as
Earth Ground on input power connector J9.
Enable/Disable (J10-8)
The Enable/Disable control pins allow ConverterPAC outputs to be sequenced either on or off.
J10-1 through J10-8 are the control pins for output positions 1 through 8, respectively. For
DualPACs, both outputs are sequenced. In parallel arrays, only the driver ModuPAC need be
controlled. The Enable/Disable pins should be pulled low to less than 0.7V with respect to
Signal Ground to disable the outputs. They will source 10mA maximum. These pins should be
open circuited or allowed to exceed 4.5V when enabled. Do not apply more than 5V to these
inputs at any time.
General Shutdown GSD (J10-12)
The GSD control pin on J10-12 allows simultaneous shutdown of all ConverterPAC outputs.
This pin must be pulled down to less than 0.7V, and will source 13 mA maximum to shut down
all outputs. The GSD pin should be open circuited or allowed to exceed 4.5V when not in use,
or when the outputs are to be enabled. Do not apply more than 5V to this input at any time.
Normal open circuit voltage is 1.5 to 3V with respect to Signal Ground.
AC Power OK (J10-11)
This is an active high TTL compatible signal, and provides a status indication of the AC input
power. It is capable of sinking 20 mA maximum. This signal switches to a TTL “1” when the
high voltage bus exceeds low-line condition during turn-on, and switches to a TTL “0” 3 ms
(typical) before loss of output regulation due to the loss of input AC power. This signal may be
used to warn external control circuits of an impending loss of power.
Applications Manual
PFC MegaPAC
1
10
12
Signal Ground
General Shutdown
Enable/Disable Output 1
J10
Enable/Disable Control
1
0
TTL "1" (OFF)
TTL "0" (ON)
A TTL "1" applied to the base of the transistor turns
output OFF. Pin 1 (or Pin 12 for GSD) is pulled Low
with respect to Signal Ground.
9
Vcc
Figure 3.
Enable/Disable
and General
Shutdown
10K
Signal Ground
AC Power OK
11
+5V
10
J10
2.49K
PN2222
Figure 4.
AC Power OK