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APW7098 Datasheet(PDF) 12 Page - Anpec Electronics Coropration |
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APW7098 Datasheet(HTML) 12 Page - Anpec Electronics Coropration |
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Copyright © ANPEC Electronics Corp. Rev. A.7 - Oct., 2011 APW7098 www.anpec.com.tw 12 Pin Description (Cont.) PIN NO. NAME FUNCTION 10 DROOP Load Line (droop) Setting. Connect a resistor between this pin and AGND to set the droop. A sourcing current, proportional to output current is present on the DROOP pin. The droop scale factor is set by the resistors (connected with CSP1, CSP2, and DROOP), resistance of the output inductors, and the internal voltage divider with the ratio of 5%. Operating Frequency Setting. The three-level input pin sets the operating frequency for each channel. RT Operating Frequency (kHz) GND 150 Floating 300 11 RT 5VCC 400 12 COMP Error Amplifier Output. Connect the compensation network between COMP, FB, and VOUT for Type 2 or Type 3 feedback compensation. 13 FB Feedback Voltage. This pin is the inverting input to the error comparator. A resistor divider from the output to the AGND is used to set the regulation voltage. 14 SS Soft-start Current Output. Connect a capacitor from this pin to the AGND to set the soft-start interval. Pulling the voltage on this pin below 0.5V causes COMP to pull low and then shuts off the output. 15 REFIN/EN External Reference and Enable Input. The IC uses the voltage (VREFIN/EN) as reference voltage of the converter with soft-start control. If this pin is driven by an external voltage ranged from 0.4V to 2V. The IC is disabled if the voltage is below 0.4V (typical). If external reference is not available, then connect this pin to 5VCC for internal 0.6V reference. 16 REFOUT/PO K Power-OK and 1.5V Reference Output. This pin is a reference output used to indicate the status of the voltages on SS pin and FB pin. REFOUT/POK provides 1.5V reference if VFB> 87.5% of reference (VR). 17 BOOT2 Bootstrap Supply for the floating high-side gate driver of channel 2. Connect the Bootstrap capacitor between the BOOT2 pin and the PHASE2 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 0.1 µF to 1µF. Ensure that C BOOT is placed near the IC. 18 UGATE2 High-side 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. 19 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. An Schottky diode between this pin and the ground is recommended to reduce negative transient voltage that is common in a power supply system. 20 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. 21 VCCDRV Drive for External Linear Regulator. This pin is the drive output for the external linear regulator. Connect this pin to base/gate of NPN/NMOS transistor as the pass element. 22 VCC Supply Voltage. This pin along with VCCDRV pin and external pass element provides 8.5V regulated bias supply, low-side gate drivers, and the bootstrap circuit for high-side drivers. This pin can receive a well-decoupled 8V~13.2V supply voltage alone if the VCCDRV is left open. Ensure that this pin is bypassed by a ceramic capacitor next to the pin. 23 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. |
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