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APW7120AKE-TRG Datasheet(PDF) 10 Page - Anpec Electronics Coropration |
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APW7120AKE-TRG Datasheet(HTML) 10 Page - Anpec Electronics Coropration |
10 / 22 page Copyright © ANPEC Electronics Corp. Rev. A.3 - Nov., 2009 APW7120A www.anpec.com.tw 10 Pin Description PIN NO. NAME FUNCTION 1 BOOT This pin provides ground referenced bias voltage to the high-side MOSFET driver. A bootstrap circuit with a diode connected to 5~12V is used to create a voltage suitable to drive a logic-level N-channel MOSFET. 2 UGATE Connect this pin to the high-side N-channel MOSFET gate. This pin provides gate drive for the high-side MOSFET. 3 GND The GND terminal provides return path for the IC bias current and the low-side MOSFET driver pull-low current. Connect the pin to the system ground via very low impedance layout on PCBs. 4 LGATE Connect this pin to the low-side N-channel MOSFET gate. This pin provides gate drive for the low-side MOSFET. 5 VCC Connect this pin to a 5~12V supply voltage. This pin provides bias supply for the control circuitry and the low-side MOSFET driver. The voltage at this pin is monitored for the Power-On-Reset (POR) purpose. 6 FB This pin is the inverting input of the internal Gm amplifier. Connect this pin to the output (VOUT) of the converter via an external resistor divider for closed-loop operation. The output voltage set by the resistor divider is determined using the following formula: (V) ) R2 R1 1 ( 0.8V VOUT + ⋅ = where R1 is the resistor connected from VOUT to FB , and R2 is the resistor connected from FB to GND. The FB pin is also monitored for under and over-voltage events. 7 OCSET The OCSET is a dual-function input pin for over-current protection and shutdown control. Connect a resistor (ROCSET) from this pin to the Drain of the low-side MOSFET. This resistor, an internal 40 µA current source (IOCSET), and the MOSFET on-resistance (RDSON) set the converter over-current trip level (IPEAK) according to the following formula: (A) R 0.4V - R A 40 I DSON OCSET PEAK ⋅ = µ Pulling and holding this pin below 0.15V with an open drain device, with very low parasitic capacitor, shuts down the IC with floating output and also resets the over-current counter. Releasing OCSET pin initiates a new soft-start and the converter works again. 8 PHASE The pin provides return path for the high-side MOSFET driver pull-low current. Connect this pin to the high-side MOSFET source. |
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