User Manual

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ANALOG CONTROL

131

External control of Shutdown

Background

The output of the power supplies can be

configured to shut down via an external switch.

The voltage across pins 7 and 20 are internally

pulled to +5V ±5% @ 500uA with 10kΩ pull-up

resistor. The output is turned off when a low

TTL level signal is applied.

Connection

PSUSwitch

Analog

connector

20

7

Output

Terminal

2 core shielded

wire or twisted

pair

 Pin7→ Switch

 Pin20 → Switch

 Wire shield → negative (-) output terminal

Steps

1. Connect the external switches according to the

connection diagrams above.

2. The switch will now shut down the power

supply when shorted.