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APW7073KE-TU Datasheet(PDF) 7 Page - Anpec Electronics Coropration |
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APW7073KE-TU Datasheet(HTML) 7 Page - Anpec Electronics Coropration |
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7 / 25 page  Copyright © ANPEC Electronics Corp. Rev. A.1 - Apr., 2006 APW7073 www.anpec.com.tw 7 Function Pin Descriptions VCC Power supply input pin. Connect a nominal 12V power supply to this pin. The power-on reset function monitors the input voltage by this pin. It is recommended that a decoupling capacitor (1 to 10uF) be connected to GND for noise decoupling. PVCC This pin provides a supply voltage for the lower gate drive, connect this pin to VCC pin in normal use. BOOT This pin provides the bootstrap voltage to the upper gate driver for driving the N-channel MOSFET. PHASE This pin is the return path for the upper gate driver. Connect 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 This pin is the signal ground pin. Connect the GND pin to a good ground plane. PGND This pin is the power ground pin for the lower gate driver. It should be tied to GND pin on the board. COMP This pin is the output of PWM error amplifier. It is used to set the compensation components. FB 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 reference voltage, the device will be shut down. UGATE This pin is the gate driver for the upper MOSFET of PWM output. LGATE This pin is the gate driver for the lower MOSFET of PWM output. SS Connect a capacitor to GND and a 10uA current source charges this capacitor to set the soft-start time. OCSET 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 200uA 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 therefore given by: ( ) DS(ON) OCSET OCSET PEAK R R 200uA I I × = EN Pull this pin above 1.3V to enable the device and pull this pin below 1.2V to disable the device. In shutdown, the SS is discharged and the UGATE and LGATE pins are held low. Note that don’t leave this pin open. RT This pin allows adjusting the switching frequency. Connect a resistor from RT pin to the ground to increase the switching frequency. Conversely, connect a resistor from RT to the VCC to decrease the switching frequency. |
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