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APW7016KC-TU Datasheet(PDF) 4 Page - Anpec Electronics Coropration |
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APW7016KC-TU Datasheet(HTML) 4 Page - Anpec Electronics Coropration |
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4 / 11 page  Copyright ANPEC Electronics Corp. Rev. A.1 - Oct., 2002 APW7016 www.anpec.com.tw 4 VSEN (pin 1) Connect this pin to the converter’s voltage output. The OVP comparator circuits monitor output voltage status and act over voltage protection by using this signal. OCSET(pin 2) Connect a resistor(R OCSET) from this pin to the drain of the upper MOSFET. An internal 200 µA current source (I OCS), ROCSET, and the upper MOSFET’s on- resistance (R DS(ON)) set the converter over-current (OC) trip point according to the following equation : I PEAK= An over-current trip resets the soft-start function. SS (Pin 3) Connect a capacitor from this pin to ground. This capacitor, along with an internal 10 µA current source, sets the soft-start interval of the converter. VID0-2 (Pins 4-6) VID0-2 are the input pins to the 3-bit DAC. The states of these three pins decide the internal voltage refer- ence (DACOUT). The level of DACOUT sets the con- verter output voltage and also sets the OVP thresholds. Table 1 specifies DACOUT for the 8 com- binations of DAC inputs. COMP (pin 7) and FB (pin 8) COMP and FB are the accessiable pins of the error amplifier. FB pin is the inverting input of the error amplifier and COMP pin is output of the error amplifier. These pins provide the compensation for the volt- age-control feedback loop of the converter. GND (Pin 9) GND is signal ground of the IC. All voltage levels are measured with respect to this pin. Pin Function Description PHASE (pin 10) Connect the PHASE pin to the source of the upper MOSFET. This pin is used to monitor the voltage drop across the upper MOSFET for over-current protection. UGATE (pin 11) Connect UGATE to the upper MOSFET gate. This pin enables the gate drive signal to drive the upper MOSFET . BOOT (pin 12) BOOT pin provides bias voltage to the upper MOSFET gate driver. A bootstrap circuit could be used to pump a BOOT voltage for enforcing the driv- ing capability of the gate driver and improving the performance of the upper MOSFET. PGND(pin 13) PGND pin provides the power ground connection. Connect this pin to the source of the lower MOSFET. LGATE (pin 14) Connect LGATE to the lower MOSFET gate. This pin enables the gate drive signal to drive the lower MOSFET. VCC (pin 15) Connect VCC to 12V voltage supply. This pin sup- plies the bias for the chip. RT (pin 16) RT pin provides oscillator switching frequency adujstment. By connecting a resistor (R T) from this pin to GND, the nominal 200kHz switching frequency is increased. Conversely. connecting a pull-up re- sistor (R T) from this pin to VCC reduces the switching frequency. I OCSET * ROCSET r DS(ON) |
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