Telescope Power Supply

The telescope module power supply (TMPSU) converts the spacecraft 28 V power bus to regulated switched and unswitched power rails within the telescope module. These are collectively referred to as the secondary power. The switched rails power the blue digital and analogue electronics and high voltages. The analogue electronics, in turn, controls the high voltages and power filter wheel fine sensor LED and flood LED's. The unswitched rails power the mechanisms and filter wheel coarse sensor. The integral Instrument Control Bus (ICB) interface provides the channel for control of the coarse sensor, flood LED's, analogue and digital electronics and also the return of current, high voltage and fine sensor status value. All switched rails are powered simultaneously on command via the ICB.

In addition, the +28 V main s/c power, routed via the TMPSU, is used to drive the heaters.