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UCC25701DTRG4 Datasheet(PDF) 4 Page - Texas Instruments |
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UCC25701DTRG4 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 24 page  4 UCC15701/2 UCC25701/2 UCC35701/2 PIN DESCRIPTIONS VDD: Power supply pin. A shunt regulator limits supply voltage to 14V typical at 10mA shunt current. PGND: Power Ground. Ground return for output driver and currents. GND: Analog Ground. Ground return for all other circuits. This pin must be connected directly to PGND on the board. OUT: Gate drive output. Output resistance is 10 W maxi- mum. VFF: Voltage feedforward pin. This pin connects to the power supply input voltage through a resistive divider and provides feedforward compensation over a 0.8V to 3.2V range. A voltage greater than 4.0V or less than 0.6V on this pin initiates a soft stop cycle. RT: The voltage on this pin mirrors VFF over a 0.8V to 3.2V range. A resistor to ground sets the ramp capacitor charge current. The resistor value should be between 20k and 200k. CT: A capacitor to ground provides the oscillator/ feedforward sawtooth waveform. Charge current is 2 · IRT, resulting in a CT slope proportional to the input volt- age. The ramp voltage range is GND to VRT. Period and oscillator frequency is given by: T VC I tR C RT T RT DIS CH T T = · · +» · · 2 05 . F RT CT » · 2 8 FB 9 VSCLAMP 10 CT 3VDD 5.0V REF SS 2 ILIM 1 COUNT 14 13 GND 4OUT 5PGND 12 VREF 0.7V 13/9V (35701) 9.6/8.8V (35702) SSDONE 7 RT 6 VFF 11 SYNC 4.5V 4V VREF 0.6V 0.2V CURRENT FAULT CURRENT LIMIT VREF 0.6V 4V 2*IRT 0.2V 3m A I 25*I RUN I IRT PEAK VALLEY SHUTDOWN LATCH FAULT LATCH 0.2V VDD HIGH LINE LOW LINE PWM SQ RD S Q RD 1.5R R RQ SD RQ SD SSDONE PWM DQ R DETAILED BLOCK DIAGRAM UDG-98004 |
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