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KA3843 Datasheet(PDF) 3 Page - Estek Electronics Co. Ltd |
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KA3843 Datasheet(HTML) 3 Page - Estek Electronics Co. Ltd |
3 / 7 page Pin functions N Function Description 1 COMP This pin is the Error Amplifier output and is made for loop compensation. 2 VFB This is the inverting input of the Error Amplifier. It is normall y connected to the switching power supply output through a resistor divider. 3 ISENSE A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. 4 RT/CT The oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground. 5 GROUND This pin is the combined control circuitry and power ground. 6 OUTPUT This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced and sink by this pin. 7 VCC This pin is the positive supply of the integrated circuit. 8 Vref This is the reference output. It provides charging current for capacitor C T through resistor RT . Application information 2.5V 1mA V FB 2 COMP 1 Figure 1. Error Amp Configuration VCC 7 ON/OFF COMMAND TO S/R OF IC ICC MIK3842 MIK3843 MIK3844 MIK3845 13mA VON VOFF 16V 10V 8.4V 7.6V 0.2mA VOFF VON VCC During UVLO, the Output is low Figure 2. Undervoltage Lockout IS R VFB COMP CURRENT SENSE + 2 _ 1 3 ERROR AMP 2R R 1V CURRENT SENSE COMPARATOR RS C GND 5 Peak current is determined by IS max 1.0V RS Figure 3. Current Sense Circuit 3 BEIJING ESTEK ELECTRONICS CO.,LTD |
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Similar Description - KA3843 |
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