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APW7074KE-TRL Datasheet(PDF) 7 Page - Anpec Electronics Coropration |
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APW7074KE-TRL Datasheet(HTML) 7 Page - Anpec Electronics Coropration |
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7 / 21 page  Copyright © ANPEC Electronics Corp. Rev. A.4 - Aug., 2008 APW7074 www.anpec.com.tw 7 Function Pin Description VCC (Pin14) Power supply input pin. Connect a nominal 12V power supply to this pin. This pin also has a power-on- reset function, which monitors the input voltage. It is recommended that a decoupling capacitor (1 to 10 µF) be connected to GND for noise decoupling. PVCC (Pin13) This pin provides a supply voltage for the lower gate drive. Connect this pin to VCC pin in normal use. BOOT (Pin10) This pin provides the bootstrap voltage to the upper gate driver in order to drive the N-channel MOSFET. PHASE (Pin8) This pin is the return path for the upper gate driver. Con- nect this pin to the upper MOSFET source. This pin is also used to monitor the voltage drop across the MOSFET for over-current protection. GND (Pin7) This pin is the signal ground pin. Connect the GND pin to a good ground plane. PGND (Pin11) This pin is the power ground pin for the lower gate driver. It should be tied to the GND pin on the board. COMP (Pin4) This pin is the output of PWM error amplifier. It is used to set the compensation components. FB (Pin5) This pin is the inverting input of the PWM error amplifier. It is used to set the output voltage and the compensation components. This pin is also monitored for under- voltage protection. If the FB voltage is under 50% of the reference voltage, the device will be shut down. UGATE (Pin9) This pin is the gate driver for the upper MOSFET of PWM output. LGATE (Pin12) This pin is the gate driver for the lower MOSFET of PWM output. SS (Pin3) Connect a capacitor to GND and a 10 µA current source charges this capacitor to set the soft-start time. OCSET (Pin2) This pin serves two functions: a shutdown control and the setting of over current limit threshold. Pulling this pin below 1.3V will shutdown the controller, forcing the UGATE and LGATE signals to be low. A resistor (Rocset) connected between this pin and the drain of the high side MOSFET will determine the over current limit. An internal 200 µA current source will flow through this resistor, creating a voltage drop, which will be compared with the voltage across the high side MOSFET. The threshold of the over current limit is there- fore given by: ( ) DS(ON) OCSET OCSET PEAK R R 200uA I I × = EN (Pin6) Pull this pin above 1.3V to enable the device and below 1.2V to disable the device. In shutdown, the SS is dis- charged and the UGATE and LGATE pins are held low. Note that don’t leave this pin open. |
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