UCC15701SLASH2 datasheet(4/23 Pages) TI2

4 / 23 page

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:

DIS CH

+»

RT CT

VSCLAMP

3VDD

5.0V

REF

ILIM

COUNT

13 GND

4OUT

5PGND

12 VREF

0.7V

13/9V (35701)

9.6/8.8V (35702)

SSDONE

VFF

SYNC

4.5V

VREF

0.6V

0.2V

CURRENT FAULT

CURRENT LIMIT

VREF

0.6V

2*IRT

0.2V

3m A

25*I

RUN

IRT

PEAK

VALLEY

SHUTDOWN

LATCH

FAULT

LATCH

0.2V

VDD

HIGH LINE

LOW LINE

PWM

Q RD

1.5R

SSDONE

PWM

DETAILED BLOCK DIAGRAM

UDG-98004

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