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RT9202B Datasheet(PDF) 4 Page - Richtek Technology Corporation |
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RT9202B Datasheet(HTML) 4 Page - Richtek Technology Corporation |
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4 / 14 page  RT9202B 4 DS9202B-03 March 2007 www.richtek.com Functional Pin Description BOOT (Pin 1) This pin provides ground referenced bias voltage to the upper MOSFET driver. A bootstrap circuit is used to create a voltage suitable to drive a logic-level N-Channel MOSFET when operating at a single 5V power supply. This pin also could be powered from ATX 12V, in this situation, an internal 6.0V regulator will supply to VCC pin for internal voltage bias. UGATE (Pin 2) Connect UGATE pin to the PWM converter's upper MOSFET gate. This pin provides the gate drive for the upper MOSFET. GND (Pin 3) Signal and power ground for the IC. All voltage levels are measured with respect to this pin. LGATE (Pin 4) Connect LGATE to the PWM converter's lower MOSFET gate. This pin provides the gate drive for the lower MOSFET. VCC (Pin 5) This is the main bias supply for the RT9202B. This pin also provides the gate bias charge for the lower MOSFET gate. The voltage at this pin is monitored for power-on reset (POR) purpose. This pin is also the internal 6.0V regulator output powered from BOOT pin when BOOT pin is directly powered from ATX 12V. FB (Pin 6) This pin is connected to the PWM converter's output divider. This pin also connects to internal PWM error amplifier inverting input and protection monitor. OCSET (Pin 7) Connect a resistor from this pin to the drain of the upper MOSFET. This resistor, an internal 20 µA current source, and the upper MOSFET on-resistance set the converter over-current trip point. An over-current trip cycles the soft- start function. The voltage at this pin is monitored for power-on reset (POR) purpose and pulling this pin low with an open drain device will shut down the IC. PHASE (Pin 8) This pin is used to monitor the voltage drop across the upper MOSFET for over-current protection. DS(ON) OCSET OCSET PEAK R R I I × = |
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Similar Description - RT9202B |
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