Specifications

12
1-800-927-9474
19-3
MOD-DIS+, MOD-DIS–
The module disable function will disable the output(s) of the 2-up- and 3-up FlatPACs. The
supply is disabled by applying current to the MOD-DIS+/MOD-DIS– input. The minimum input
current for disabling the supplies is 1 mA. The maximum allowable current is 30 mA.
Electrical Connections
Status output pairs AC-OK+, AC-OK– and BUS-OK+, BUS-OK– are the collectors (+) and
emitters (–) of NPN optoisolator output transistors (one optoisolator per status signal). The
collector terminals AC-OK+ and BUS-OK+ of the optocouplers, in a typical application, can be
connected via current limiting resistors to a source no greater than 70Vdc. These resistors
should limit the maximum current to the optocoupler output transistors to 1.5 mA. The emitter
terminals AC-OK– and BUS-OK– are connected to the return of the external source. The status
OK condition will set the optocoupler output transistors in saturation and are capable of sinking
up to 1.5 mA with a Vce saturation voltage of 0.4V. Users should be cautioned that although the
output of the FlatPAC can be used as the pull-up source, shortly after BUS-OK changes from
OK (saturated) to NOT OK (high Z), the pull-up voltage will be shut down. It is thus advisable
to provide a capacitive reservoir, if the pull-up source is one of the FlatPAC’s outputs, in order
to maintain the pull-up potential after loss of DC current output. Use edge sensing logic to
detect assertion of logic outputs, or a separate source of bias supply voltage (i.e., backup
batteries) to provide a safe pull-up voltage source regardless of the AC line status.
MOD DIS Input.
Apply a current
of 1
-
30mA to
disable output.
Forward voltage
drop of internal opto
diode is 1.65V max.
at 30mA max.
V
+
r
AC OK
+
–
1.5mA
max.
V
+
r
BUS OK
+
–
30mA max.
Disable
MOD DIS
V
+
+
–
1.5mA
max.
FlatPAC
AC OK and BUS OK
Status Outputs.
Outputs low when OK.
Vce sat. = < 0.4V @
1.5mA. Maximum
external pullup is
70Vdc. AC OK and
BUS OK signals
are isolated and
can have different
reference levels.
The FlatPAC AC-DC Switching Power Supply