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ML4823CP

High Frequency Power Supply Controller

Micro Linear Corporation 

SOFT START AND CURRENT LIMIT

The ML4823 employs two current limits. When the

voltage at ILIM/SD exceeds the ILIM REF threshold on ILIM

REF, the outputs are immediately shut off and the cycle is

terminated for the remainder of the oscillator period by

resetting the RS flip flop.

If the output current is rising quickly (usually due to

transformer saturation) such that the voltage on pin 9

reaches 1.4V before the outputs have turned off, a soft

start cycle is initiated. The soft start capacitor is discharged

and outputs are held “off” until the voltage at SS reaches

1V, ensuring a complete soft start cycle. The duty cycle on

start up is limited by limiting the output voltage of the

error amplifier voltage to the voltage at the SS pin.

ML4823

7

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