UC3842 datasheet(5/12 Pages) FAIRCHILD

Part No.	UC3842

Description	SMPS Controller

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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UC3842/UC3843/UC3844/UC3845

Figure 2. Under Voltage Lockout

During Under-Voltage Lock-Out, the output driver is biased to a high impedance state. Pin 6 should be shunted to ground with

a bleeder resistor to prevent activating the power switch with output leakage current.

Figure 3. Error Amp Configuration

Figure 4. Current Sense Circuit

Peak current (IS) is determined by the formula:

A small RC filter may be required to suppress switch transients.

UC3842/44 UC3843/45

S MAX

() 1.0V

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