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APW8720BKAI-TRL Datasheet(PDF) 8 Page - Anpec Electronics Coropration |
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APW8720BKAI-TRL Datasheet(HTML) 8 Page - Anpec Electronics Coropration |
8 / 22 page Copyright © ANPEC Electronics Corp. Rev. A.5 - Mar., 2012 APW8720B www.anpec.com.tw 8 Pin Description PIN NO. SOP-8P TDFN3x3-10 NAME FUNCTION 1 1 BOOT This pin provides the bootstrap voltage to the high-side gate driver for driving the N-channel MOSFET. An external capacitor from PHASE to BOOT, an internal diode, and the boot supply voltage (9V), generates the bootstrap voltage for the high-side gate driver (UGATE). 2 2 UGATE High-side Gate Driver Output. This pin is the gate driver for high-side MOSFET. 3 4 GND Signal and Power ground. Connecting this pin to system ground. 4 5 LGATE Low-side Gate Driver Output and Over-Current Setting Input. This pin is the gate driver for low-side MOSFET. It also used to set the maximum inductor current. Refer to the section in “Function Description” for detail. 5 6 VCC Power Supply Input. Connect a nominal 5V to 12V power supply voltage to this pin. A power-on-reset function monitors the input voltage at this pin. It is recommended that a decoupling capacitor (1 to 10 µF) is connected to GND for noise decoupling. 6 7 FB Feedback Input of Converter. The converter senses feedback voltage via FB and regulates the FB voltage at 0.8V. Connecting FB with a resistor-divider from the output sets the output voltage of the converter. 7 8 COMP This is a multiplexed pin. During soft-start and normal converter operation, this pin represents the output of the error amplifier. It is used to compensate the regulation control loop in combination with the FB pin. Pulling COMP low (VDISABLE = 0.4V max.) will shut down the controller. When the pull-down device is released, the COMP pin will start to rise. When the COMP pin rises above the VDISABLE trip point, the APW8720B will begin a new initialization and soft-start cycle. 8 3 PHASE This pin is the return path for the high-side gate driver. Connecting this pin to the high-side MOSFET source and connect a capacitor to BOOT for the bootstrap voltage. This pin is also used to monitor the voltage drop across the low-side MOSFET for over-current protection. 9 (Exposed Pad) 11 (Exposed Pad) GND Thermal Pad. Connect this pad to the system ground plan for good thermal conductivity. - 9 POK POK is an open drain output used to indicate the status of the output voltage. Connect the POK pin to 5 to 12V through a pull-high resistor. - 10 NC No Connect |
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