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APW7120KE-TRG Datasheet(PDF) 5 Page - Anpec Electronics Coropration |
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APW7120KE-TRG Datasheet(HTML) 5 Page - Anpec Electronics Coropration |
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5 / 22 page  Copyright © ANPEC Electronics Corp. Rev. A.5 - Jun., 2008 APW7120 www.anpec.com.tw 5 Function Pin Description BOOT (Pin 1) 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. UGATE (Pin 2) Connect this pin to the high-side N-channel MOSFET ’s gate. This pin provides gate drive for the high-side MOSFET. GND (Pin 3) The GND terminal provides return path for the IC ’s bias current and the low-side MOSFET driver ’s pull-low current. Connect the pin to the system ground via very low impedance layout on PCBs. LGATE (Pin 4) Connect this pin to the low-side N-channel MOSFET ’s gate. This pin provides gate drive for the low-side MOSFET. VCC (Pin 5) 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. FB (Pin 6) This pin is the inverting input of the internal Gm amplifier. Connect this pin to the output (V OUT) of the converter via an external resistor divider for closed-loop operation. The output voltage set by the resistor divider is deter- mined using the following formula : where R1 is the resistor connected from V OUT to FB , and R2 is the resistor connected from FB to GND. The FB pin is also monitored for under and over-voltage events. OCSET (Pin 7) The OCSET is a dual-function input pin for over- current protection and shutdown control. Connect a resistor (R OCSET) from this pin to the Drain of the low- side MOSFET. This resistor, an internal 40 µA current source (I OCSET), and the MOSFET’s on-resistance (R DSON) set the converter over-current trip level (IPEAK) according to the following formula: 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. PHASE (Pin 8) The pin provides return path for the high-side MOSFET driver ’s pull-low current. Connect this pin to the high- side MOSFET ’s source. (V) ) R2 R1 1 ( 0.8V V OUT + ⋅ = (A) R 0.4V - R A 40 I DSON OCSET PEAK ⋅ = μ |
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