Delta Electronics Series Q48DR Features Descriptions, Over-Current Protection, Remote On/Off

FEATURES DESCRIPTIONS

Over-Current Protection

The modules include an internal output over-current protection circuit, which will endure current limiting for an unlimited duration during output overload. If the output current exceeds the OCP set point, the modules will automatically shut down (hiccup mode).

The modules will try to restart after shutdown. If the overload condition still exists, the module will shut down again. This restart trial will continue until the overload condition is corrected.

Over-Voltage Protection

The modules include an internal output over-voltage protection circuit, which monitors the voltage on the output terminals. If this voltage exceeds the over- voltage set point, the module will shut down.

The module will try to restart after shutdown. If the over- voltage condition still exists during restart, the module will shut down again. This restart trial will continue until the output voltage is within specification.

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 shut down.

The module will try to restart after shutdown. If the over- temperature condition still exists during restart, the module will shut down again. This restart trial will continue until the temperature is within specification.

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 a logic low and off during a logic high. Positive logic turns the modules on during a logic high and off during a 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 to floating.

Figure 19: Remote on/off implementation

Output Voltage Adjustment (TRIM)

To increase or decrease the output voltage set point, the modules may be connected with an external resistor between the TRIM pin and either Vout1(+) or RTN. The TRIM pin should be left open if this feature is not used.

Figure 20: Circuit configuration for trim-down (decrease output voltage)

If the external resistor is connected between the TRIM and Vout1(+) pin, the output voltage set point decreases (Fig. 20). The external resistor value is from the table below.

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DS_Q48DR1R833_03162007