SM74304

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SNVS720A – OCTOBER 2011 – REVISED APRIL 2013

Thermal Protection

Internal Thermal Shutdown circuitry is provided to protect the integrated circuit in the event the maximum junction

temperature is exceeded. When thermal protection is activated, typically at 165 degrees Celsius, the controller is

forced into a low power reset state, disabling the output driver. This feature is provided to prevent catastrophic

failures from accidental device overheating.

Minimum Load Current

A minimum load current of 1 mA is required to maintain proper operation. If the load current falls below that level,

the bootstrap capacitor may discharge during the long off-time, and the circuit will either shutdown, or cycle on

and off at a low frequency. If the load current is expected to drop below 1 mA in the application, the feedback

resistors should be chosen low enough in value so they provide the minimum required current at nominal Vout.

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