UCC25705D datasheet(3/12 Pages) TI

3 / 12 page

UCC25705, UCC25706, UCC35705, UCC35706

HIGHSPEED VOLTAGE MODE PULSE WIDTH MODULATOR

SLUS473A – NOVEMBER 1999 – REVISED MARCH 2001

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electrical characteristics, VDD = 11 V, VIN = 30 V, RT = 47 k, RDISCH = 400 k, RFF = 14 k, CT = 220 pF,

CVDD = 0.1 µF, and no load on the outputs, 0°C ≤ TA ≤ 70°C for the UCC3570x and –40°C ≤ TA ≤ 85°C

for the UCC2570x, TA = TJ, (unless otherwise specified)

line sense section

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Low line comparator threshold

0.95

1.00

1.05

Input bias current (VFF)

–100

100

oscillator section

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Frequency

VFF = 1.2 V to 4.8 V

0.9

1.0

1.1

MHz

CT peak oltage

VFF = 1.2 V,

See Note 1

1.2

CT peak voltage

VFF = 4.8 V,

See Note 1

4.8

CT valley voltage

See Note 1

NOTE 1: Ensured by design. Not production tested.

current limit section

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Input bias current

0.2

–0.2

–1

µA

Current limit threshold

180

200

220

Propagation delay, ILIM to OUT

50 mV overdrive

pulse width modulator section

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

FB input impedance

VFB = 3 V

Ω

Minimum duty cycle

VFB < 2 V

Ma im m d t c cle

VFB = VDD,FOSC = 1 MHz

Maximum duty cycle

VDISCH = 0 V,

FOSC = 1 MHz

PWM gain

VFF = 2.5 V,

MODE = 1

%/V

Propagation delay, PWM to OUT

120

output section

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

VOH

IOUT = –5 mA,

VDD – output

0.3

0.6

VOL

IOUT = 5 mA

0.15

0.4

Rise time

CLOAD = 50 pF

Fall time

CLOAD = 50 pF

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