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APW7066QAC-TRL Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APW7066QAC-TRL Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
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9 / 34 page  Copyright © ANPEC Electronics Corp. Rev. A.4 - Jun., 2005 APW7066 www.anpec.com.tw 9 Function Pin Descriptions VCC Power supply input pin. Connect a nominal 5V power supply to this pin for the control circuit, or connect a resistor (nominally 300 Ω) to VCC12 for a shunt regulator function (typical 5.8V). It is recommended that a decoupling capacitor (1 to 10uF) is connected to the GND for noise decoupling. GND This pin is the signal ground pin. The metal thermal pad under the package is the IC substrate; connects the GND pin and metal thermal pad together on the board, and ties to the good GND plane for electrical and thermal conduction. VCC12 Power supply input pin. Connect a nominal 12V power supply to this pin for the gate driver. It is recommended that a decoupling capacitor (1 to 10uF) is connected to the GND for noise decoupling. PGND This pin is the power ground pin for the gate driver and linear driver circuit. It should be tied to the GND. FB1, FB2, FB3 These pins are the inverting inputs of the error ampli- fiers of their respective regulators. They are used to set the output v oltage and the com pensation components. SS1/EN1, SS2/EN2, SS3/EN3 These pins provide two functions. Connect a capacitor to the GND for setting the soft-start time. Use an open drain logic signal to pull the SS/EN pin low to disable the respective output, leave open to enable the re- spective output. COMP1, COMP2 These pins are the outputs of error amplifiers of their respectiv e regulators. They are used to set the compensation components. UGATE1,UGATE2 These pins provide the gate driver for the upper MOSFETs of VOUT1 and VOUT2. LGATE1, LGATE2 These pins provide the gate driver for the lower MOSFETs of VOUT1 and VOUT2. BOOT1, BOOT2 These pins provide the bootstrap voltage to the gate driver for driving the upper MOSFETs. It can be connected to a power voltage directly, but the differ- ence voltage between the BOOT and VIN must be high enough to drive the upper MOSFETs. REFIN This pin is the reference input voltage of error amplifier of the VOUT2. It also provides the voltage into a buffer, which is out on the REFOUT pin. REFOUT This pin provides a buffed voltage, which is from REFIN pin. In Independent mode, it can be used by other ICs. In DDR mode, it is from the VOUT1, and can be used as the VTT buffer. This pin also uses to select the phase shift (see table1). When this pin pulls to VCC, the buffer is disabled and the REFOUT is not available for use. It is recommended that a 0.1uF capacitor is connected to the ground for stability. VREF This pin provides a 3.3V reference voltage, which can be used by the REFIN pin or other ICs as a voltage reference. It is recommended that a 1uF capacitor is connected to ground for stability. DRIVE3 This pin drives the gate of an external N-channel MOSFET for linear regulator. PGOOD This pin is an open drain device; connect a pull up resistor to the VCC for PGOOD function. FS/SYNC This pin is used to adjust the switching frequency. Connecting a resistor from FS/SYNC pin to the ground increases the switching frequency. Conversely, con- necting a resistor from this pin to the VCC12 reduces the switching frequency. In addition, this pin also provides synchronous frequency function. An external clock can be fed into this pin, and force the switching frequency to follow the external clock. |
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