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UCC2819ADRG4 Datasheet(PDF) 6 Page - Texas Instruments |
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UCC2819ADRG4 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 21 page UCC2819A UCC3819A SLUS579 − OCTOBER, 2003 6 www.ti.com PIN ASSIGNMENTS TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION CAI 4 I Current amplifier noninverting input CAOUT 3 O Current amplifier output CT 14 I Oscillator timing capacitor DRVOUT 16 O Gate drive GND 1 − Ground IAC 6 I Current proportional to input voltage MOUT 5 I/O Multiplier output and current amplifier inverting input OVP/EN 10 I Over-voltage/enable PKLMT 2 I PFC peak current limit RT 12 I Oscillator charging current VAI 13 I Voltage amplifier non-inverting input VAOUT 7 O Voltage amplifier output VCC 15 I Positive supply voltage VFF 8 I Feed-forward voltage VSENSE 11 I Voltage amplifier inverting input VREF 9 O Voltage reference output Pin Descriptions CAI: Place a resistor between this pin and the GND side of current-sense resistor. This input and the inverting input (MOUT) remain functional down to and below GND. CAOUT: This is the output of a wide bandwidth operational amplifier that senses line current and commands the PFC pulse-width modulator (PWM) to force the correct duty cycle. Compensation components are placed between CAOUT and MOUT. CT: A capacitor from CT to GND sets the PWM oscillator frequency according to: f [ 0.6 RT CT The lead from the oscillator timing capacitor to GND should be as short and direct as possible. DRVOUT: The output drive for the boost switch is a totem-pole MOSFET gate driver on DRVOUT. To avoid the excessive overshoot of the DRVOUT while driving a capacitive load, a series gate current-limiting/damping resistor is recommended to prevent interaction between the gate impedance and the output driver. The value of the series gate resistor is based on the pulldown resistance (Rpulldown which is 4-Ω typical), the maximum VCC voltage (VCC), and the required maximum gate drive current (Imax). Using the equation below, a series gate resistance of resistance 11 Ω would be required for a maximum VCC voltage of 18 V and for 1.2 A of maximum sink current. The source current will be limited to approximately 900 mA (based on the Rpullup of 9-Ω typical). R GATE + VCC * I MAX R pulldown I MAX GND: All voltages measured with respect to ground. VCC and REF should be bypassed directly to GND with a 0.1- µF or larger ceramic capacitor. |
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