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APW6020C-TU Datasheet(PDF) 5 Page - Anpec Electronics Coropration |
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APW6020C-TU Datasheet(HTML) 5 Page - Anpec Electronics Coropration |
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5 / 13 page  Copyright ANPEC Electronics Corp. Rev. A.2 - May, 2001 APW6020 www.anpec.com.tw 5 Functional Pin Description UGATE2 (Pin 1) Connect UGATE2 pin to the standard BUCK PWM converter’s MOSFET gate. This pin provides the gate drive for the MOSFET. PHASE2 (Pin 2) Connect the PHASE2 pin to the standard BUCK PWM converter’s MOSFET source. This pin is used to monitor the voltage drop across the MOSFET for over-current protection. VID0 , VID1 , VID2 , VID3 , VID4 (Pins 7, 6 , 5 , 4 and 3) VID0-4 are the TTL-compatible input pins to the 5-bit DAC. The logic states of these five pins program the internal voltage reference (DACOUT). The level of DACOUT sets the microprocessor core converter output voltage , as well as the coresponding PGOOD and OVP thresholds. PGOOD (Pin 8) PGOOD is an open drain output used to indicate the status of the output voltages. This pin is pulled low when the synchronous regulator output is not within 10% of the DACOUT reference voltage or when any of the other outputs are below their under-voltage thresholds. The PGOOD output is open for ‘11111’ VID code. OCSET2 (Pin 9) Connect a resistor (R OCSET ) from this pin to the drain of the standard BUCK converter’s MOSFET. R OCSET , an internal 200 µA current source (I OCSET ) , and the MOSFET’s on-resistance(r DS(ON)) set the converter over-current (OC) trip point according to the follow- ing equation : I PEAK = An over-current trip cycles the soft-start function. VSEN2 (Pin 10) Connect this pin to the output of the standard Buck PWM converter. The voltage at this pin is regulated to the level predetermined by the logic-level status of the SELECT pin. This pin is also monitored by the PGOOD comparator circuit. SELECT (Pin 11) This pin determines the output voltage of the AGP bus switching regulator. A low TTL input sets the output voltage to 1.5V , while a high input sets the output voltage to 3.3V. SS (Pin 12) Connect a capacitor from this pin to ground. This capacitor , along with an internal 28 µA current source , sets the soft-start interval of the converter. FAULT / RT (Pin 13) This pin provides oscillator switching frequency adjustment. By placing a resistor (R T ) from this pin to GND , the nominal 200kHz switching frequency is increased. Conversely , connecting a pull-up resis- tor (R T ) from this pin to VCC reduces the switching frequency. Nominally , the voltage at this pin is 1.26V. In the event of an over-voltage or over-current condition , this pin is internally pulled to VCC. VSEN4 (Pin 14) Connect this pin to the output of the linear 1.8V regulator. This pin is monitored for under-voltage events. DRIVE4 (Pin 15) Connect this pin to the gate of an external MOSFET. This pin provides the drive for the 1.8V regulator’s pass transistor. VAUX (Pin 16) The +3.3V input voltage at this pin is monitored for I OCSET * ROCSET r DS(ON) |
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