Delta Electronics Series 240W manual Over-Temperature Protection, Remote On/Off

Over-Temperature Protection

The over-temperature protection consists of circuitry that provides protection from thermal damage. If the temperature exceeds the over-temperature threshold, the module will be shut down, and enter in the auto-restart mode or latch mode, which is optional.

For auto-restart mode, the module will monitor the module temperature after shutdown. Once the temperature of module is decreased by an OTP hystersis that is about 30°C, the module will auto-restart.

For latch mode, the module will latch off once it shutdown. Either cycling the input power or toggling the on/off signal for one second can reset the latch.

Remote On/Off

The remote on/off feature on the module can be either negative or positive logic. Negative logic turns the module on during logic low and off during logic high. Positive logic turns the modules on during logic high and off during logic low.

Remote on/off can be controlled by an external switch between the on/off terminal and the Vi(-) terminal. The switch can be an open collector or open drain.

For negative logic if the remote on/off feature is not used, please short the on/off pin to Vi(-). For positive logic if the remote on/off feature is not used, please leave the on/off pin floating.

Vi(+) Vo(+)

ON/OFF

Vi(-) Vo(-)

Figure 16: Remote on/off implementation

R

Load

Current Sharing

The modules are designed to operate in parallel without the use of any external current share circuitry. For design assistance with Parallel and related PWB layout issues, please contact Delta’s technical support team.

DS_E48SB12020_05222008

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