UC3842 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

UC3842

CURRENT MODE PWM CONTROLLER

STMicroelectronics 

Figure 1 : Error Amp Configuration.

Error amp can source or

sink up to 0.5mA

Figure 2 : Under Voltage Lockout.

UC2842/3/4/5-UC3842/3/4/5

During Under-Voltage Lockout, the output driver is

biased to sink minor amounts of current. Pin 6

should be shunted to groundwith a bleederresistor

Figure 3 : Current Sense Circuit .

to preventactivating the power switch with extrane-

ous leakage currents.

Peak current (is) is determined by the formula

IS

max

≈

1.0 V

RS

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

5/11

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