CHAPTER 2 NDA-24296
Page 112
Revision 1.0
PH-PW14
Power Switch
PH-PW14
Power Switch
1. General Function
This circuit card is a power supply card that supplies DC -48 V operating power to the circuit cards mounted
in the TSWM. It also provides the DC-DC converter function which generates output power DC +5 V, -5
V, and +12 V to MISC slots.
The two PWR SWs cards make the power supply redundant.
Figure 2-49 -48 V Output Circuit Diagram
Con-
troller
Con-
troller
DC-
DC
DC-
DC
Load
Load
-48V
-48V IN
Switch
FUSE FUSE
PWR SW #0
FET Switch
PWR SW #1