Fairchild Power Switch

The PWM controller features integrated oscillator to be synchronized with the external sync signal, under voltage lockout, optimized gate driver and temperature compensated precise current sources for the loop compensation. This device also includes various fault protection circuits such as over voltage protection, over load protection, abnormal over current protection and over temperature protection.

Read More Source:
http://www.fairchildsemi.com/an/AN/AN-4108.pdf
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