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AZ3842MM Datasheet(PDF) 2 Page - Advanced Analog Technology, Inc. |
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AZ3842MM Datasheet(HTML) 2 Page - Advanced Analog Technology, Inc. |
2 / 13 page CURRENT MODE PWM CONTROLLER AZ3842/3/4/5 Advanced Analog Circuits Data Sheet 2 March 2003 Rev: 1.0 Figure 2. Pin Configuration of AZ3842/3/4/5 (Top View) P/M Package (DIP-8/SOIC-8) (SOIC-14) Pin Configuration COMP ISENSE VFB RT/CT 8 VREF 7 VCC 6 OUTPUT 5 GND 1 2 3 4 N/C VFB N/C ISENSE N/C RT/CT COMP 14 VREF 13 N/C 12 VCC 11 PWR VC 10 OUTPUT 9 GND 8 PWR GND 1 2 3 4 5 6 7 Pin Description Pin Number Pin Name Function 8-pin 14-pin 1 1 COMP This pin is the Error Amplifier output and is made available for loop compensation. 23 VFB The inverting input of the Error Amplifier. It is normally connected to the switching power supply output through a resistor divider. 35 ISENSE A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. 47 RT/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 pos- sible. 5 GND The combined control circuitry and power ground. 6 10 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. 712 VCC The positive supply of the control IC. 814 VREF This is the reference output. It provides charging current for capacitor CT through resistor RT. 8 PWR GND This pin is a separate power ground return that is connected back to the power source. It is used to reduce the effects of switching transient noise on the control circuitry. 11 PWR VC The Output high state (VOH) is set by the voltage applied to this pin. With a separate power source connection, it can reduce the effects of switching transient noise on the control circuitry. 9 GND This pin is the control circuitry ground return and is connected back to the power source ground. 2,4,6,13 N/C No connection. These pins are not internally connected. M Package |
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