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AP3845CMTR-E1 Datasheet(PDF) 2 Page - BCD Semiconductor Manufacturing Limited |
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AP3845CMTR-E1 Datasheet(HTML) 2 Page - BCD Semiconductor Manufacturing Limited |
2 / 13 page CURRENT MODE PWM CONTROLLER AP384XC Data Sheet 2 Sep. 2006 Rev. 1. 1 BCD Semiconductor Manufacturing Limited Figure 2. Pin Configuration of AP3842C/3C/4C/5C (Top View) Pin Configuration Pin Description Pin Number Pin Name Function 1 COMP This pin is the Error Amplifier output and is made available for loop compensation. 2VFB The inverting input of the Error Amplifier. It is normally connected to the switching power supply output through a resistor divider. 3ISENSE A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. 4RT/CT The Oscillator frequency and maximum output duty cycle are programmed by con- necting resistor RT to VREF and capacitor CT to ground. Operation to 500 kHz is possi- ble. 5 GND The combined control circuitry and power ground. 6 OUTPUT This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are sourced and sunk by this pin. 7VCC The positive supply of the control IC. 8VREF This is the reference output. It provides charging current for capacitor CT through resistor RT. P/M Package (DIP-8/SOIC-8) COMP ISENSE VFB RT/CT 8 VREF 7 VCC 6 OUTPUT 5 GND 1 2 3 4 |
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