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Schematic of power supply architecture.

Turn-On Transients

The figure below illustrates the transient currents seen as the X-123 turns on.

1) When 5 VDC is first applied to the power input, a large transient current is drawn to charge up

the 50 F of input capacitance, from the input capacitors on all the supplies.

2) About 400 sec later, the low voltage switching supplies turn on. The maximum inrush current is

about 2 A, with a duration of <100 sec. It is important that the external supply be able to provide

this current. If this current is limited, some of the supplies can be destroyed.

3) After the DP5 is powered up, it then powers up the PC5, based on configuration settings stored in

the DP5. Depending on the "Set Power-on State" configuration option, this either happens

automatically (approx. 2 seconds after power is applied), or upon command from the host PC.

The unit draws about 300 mA at 5 V.

4) When the cooling is turned on, I

5) In this figure, the set point was 230 K, the ambient 295 K, and a SDD on a two stage cooler was

used. After about 50 seconds, the temperature approached the set point and so began regulating.

The current decreased to its steady state value, 400 mA.

X-123 User Manual

goes to its maximum, drawing approximately 700 mA.