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ML4823IQ Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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ML4823IQ Datasheet(HTML) 7 Page - Fairchild Semiconductor |
7 / 9 page ML4823 REV. 1.0 10/12/2000 7 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. |
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