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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RT9212PC датащи(PDF) 4 Page - Richtek Technology Corporation |
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RT9212PC датащи(HTML) 4 Page - Richtek Technology Corporation |
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4 / 14 page  RT9212 Preliminary DS9212-05 March 2007 4 www.richtek.com Function Block Diagram MOSFET upper the of R 40uA I DS(ON) OCSET OCSET R × = + - Bias Soft- Start 1 Control Logic Control Logic OVP & UVP 0.8V Ref. Power Good Power on Reset 300kHz Oscillator Zc Linear Regulator Zf + - + - + - BOOT1 OCSET1/SD UGATE1 PVCC1 LGATE1 PGND1 PGND2 LGATE2 PHASE2 UGATE2 BOOT2 PHASE1 VCC FB1 COMP1 PGOOD FBL FB2 DRV Thermal SHDN Thermal SHDN OC UV OV UV OV OC PWM1 PWM2 180 deg shift 40uA OC POR OV UV 137.5% 62.5% 0.8V FB2 EA EA Soft- Start 2 + - OV UV POR OC 40uA + + OCSET2/SD GNDA VCC Thermal SHDN PGOOD (Pin 19) PGOOD is an open-drain output used to indicate that both the channel 1 and channel 2 regulators are within normal operating voltage ranges. OCSET2/SD (Pin 20), OCSET1/SD (Pin 21) Connect a resistor (ROCSET) from this pin to the drain of the upper MOSFET of the supply voltage sets the over- current trip point. ROCSET, an internal 40 μA current source , and the upper MOSFET on-resistance, (RDS(ON), set the converter over-current trip point (IOCSET) according to the following equation: An over-current trip cycles the soft-start function. Pulling the pin to ground resets the device and all external MOSFETs are turned off allowing the two output voltage power rails to float. PVCC1 (Pin 22) Connect this pin to a well-decoupled 5V supply. It is also the positive supply for the lower gate driver, LGATE1. LGATE1 (Pin 23) Channel 1 power gate drive output. Connect to gate of the low-side power N-Channel MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the lower MOSFET has turned off. PGND1 (Pin 24) Return pin for high currents flowing in low-side power N-MOSFET. Ties the pin directly to the low-side MOSFET source and ground plane with the lowest impedance. |
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