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APW8700QAI-TRG Datasheet(PDF) 6 Page - Anpec Electronics Coropration |
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APW8700QAI-TRG Datasheet(HTML) 6 Page - Anpec Electronics Coropration |
6 / 26 page Copyright © ANPEC Electronics Corp. Rev. A.1 - Jun., 2011 APW8700 www.anpec.com.tw 6 Pin Description PIN NAME FUNCTION 1 REFIN External Reference Input. This is input pin of external reference voltage. Connect a voltage divider from VREF to REFIN to AGND to set the reference voltage. 2 VREF Reference Voltage Output. This is the output pin of high precision 2V reference voltage. Bypass this pin with a 1 µF ceramic capacitor to AGND. 3 RT/EN Operation Frequency Setting. Connecting a resistor between this pin and AGND to set the operation frequency. Pull this pin to ground to shut down the APW8700. 4 IOFS Current Balance Adjustment. Connect a resistor from this pin to VREF or GND to adjust the current sharing. 5 COMP Error Amplifier Output. Use this pin in combination with the FB pin to compensate the voltage-control feedback loop of the converter. 6 FB Feedback Voltage. This pin is the inverting input to the error amplifier. Use this pin in combination with the COMP pin to compensate the voltage control feedback loop of the converter. 7 AGND Analog Ground. Connect this pin to the GND pin where the output voltage is to be regulated. 8 EAP Non-Inverting Input of Error Amplifier. Connect a resistor to SS pin to set the droop slope. 9 SS Soft Start Output. Connect a capacitor to GND to set the soft start interval. 10 CSN Inverting Input of Current Sensing Amplifier. 11 CSP Non-Inverting Input of Current Sensing Amplifier. 12 PSI Power Saving Indicator. Connect a resistor from PSI to AGND to set the power saving mode threshold current level. Connect this pin to VREF for always two phases operation. Short this pin to ground for always single-phase operation. Don’t left this pin floating. 13 BOOT1 Bootstrap Supply for the floating high-side gate driver of channel 1. Connect the Bootstrap capacitor between the BOOT1 pin and the PHASE1 pin to form a bootstrap circuit. The bootstrap capacitor provides the charge to turn on the high-side MOSFET. Typical values for CBOOT range from 0.1µF to 1µF.Ensure that CBOOT is placed near the IC. 14 UGATE1 Upper Gate Driver Output for channel 1. Connect this pin to the gate of high-side MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the high-side MOSFET has turned off. 15 PHASE1 Switch Node for Channel 1. Connect this pin to the source of high-side MOSFET and the drain of the low-side MOSFET. This pin is used as sink for UGATE1 driver. This pin is also monitored by the adaptive shoot-through protection circuitry to determine when the high-side MOSFET has turned off. 16 LGATE1 Low-side Gate Driver Output for Channel 1. Connect this pin to the gate of low-side MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the low-side MOSFET has turned off. 17 PVCC Supply Voltage for Gate Driver. This pin is the output of internal 9V LDO. It provides current for gate drives. Bypass this pin with a minimum 1 µF ceramic capacitor. If VCC below 7V, connect this pin to VCC is recommended. 18 VCC Supply Voltage. This pin provides current for internal control circuit and 9V LDO. Bypass this pin with a minimum 1 µF ceramic capacitor next to the IC. 19 LGATE2 Low-side Gate Driver Output for Channel 2. Connect this pin to the gate of low-side MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the low-side MOSFET has turned off. 20 PHASE2 Switch Node for Channel 2. Connect this pin to the source of high-side MOSFET and the drain of the low-side MOSFET. This pin is used as sink for UGATE2 driver. This pin is also monitored by the adaptive shoot-through protection circuitry to determine when the high-side MOSFET has turned off. 21 UGATE2 Upper Gate Driver Output for channel 2. Connect this pin to the gate of high-side MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the high-side MOSFET has turned off. |
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