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APW7120 Datasheet(PDF) 1 Page - Anpec Electronics Coropration |
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APW7120 Datasheet(HTML) 1 Page - Anpec Electronics Coropration |
1 / 20 page Copyright © ANPEC Electronics Corp. Rev. A.4 - Jan., 2006 APW7120 www.anpec.com.tw 1 ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. 5V to 12V Supply Voltage, 8-PIN, Synchronous Buck PWM Controller • Operating with Single 5~12V Supply Voltage or two Supply Voltages • Drive Dual Low Cost N-Channel MOSFETs - Adaptive Shoot-Through Protection • Built-in Feedback Compensation - Voltage-Mode PWM Control - 0~100% Duty Ratio - Fast Transient Response • ±2% 0.8V Reference - Over Line, Load Regulation and Operating Temp. • Programmable Over-Current Protection - Using R DS(ON) of Low-Side MOSFET • Hiccup-Mode Under-Voltage Protection • 118% Over-Voltage Protection • Adjustable Output Voltage • Small Converter Size - 300kHz Constant Switching Frequency - Small SOP-8 Package • Built-In Digital Soft-Start • Shutdown Control using an External MOSFET • Lead Free Available (RoHS Compliant) Features Applications General Description The APW7120 is a fixed 300kHz frequency, voltage mode, synchronous PWM controller. The device drives two low cost N-channel MOSFETs and is designed to work with single 5~12V or two supply voltage(s), providing excellent regulation for load transients. The APW7120 integrates controls, monitoring and protection functions into a single 8-pin package to provide a low cost and perfect power solution. A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. An internal 0.8V reference provides low output voltage down to 0.8V for further applications. An built-in digital soft-start with fixed soft-start interval prevents the output voltage from overshoot as well as limiting the input current. The controller’s over-current protection monitors the output current by using the voltage drop across the low-side MOSFET’s R DS(ON), eliminating the need of a current sensing resistor. Additional under voltage and over v oltage protections monitor the v oltage on FB pin for short-circuit and over-voltage protections. The over-current protection cycles the soft-start function until 4 over-current events are counted. Pulling and holding the voltage on OCSET pin below 0.15V with an open drain device shuts down the controller. Pinouts 1 2 3 4 8 7 6 5 PHASE OCSET FB VCC BOOT UGATE GND LGATE SOP-8 • Motherboard • Graphics Card • High Current, up to 20A, DC-DC Converters |
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