UCC2884 datasheet(4/12 Pages) TI1

Part #	UCC2884

Description	Frequency Foldback Current Mode PWM Controller

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ELECTRICAL CHARACTERISTICS

UCC2884

UCC3884

SLUS160C – AUGUST 1999 – REVISED NOVEMBER 2008............................................................................................................................................. www.ti.com

Unless otherwise specified, these specifications apply for TA = -40°C to 85°C for the UCC2884, and 0°C to 70°C for the

UCC3884, CT = 220 pF, RON = 53 kΩ, ROFF = 38 kΩ, VOUT = VREF, VVS = 0 V, CSS = 2.5 nF, VDD = 11 V, Output no load,

TA = TJ.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

5-V Reference

VREF

IREF = 0 mA

4.86

5

5.14

V

Line regulation

VDD = 10 V to 12 V

1

10

mV

Load regulation

0 < IREF < 5 mA

1

20

Short circuit

VREF = 0 V

15

45

mA

Oscillator

Accuracy

VOUT = VREF

360

400

440

kHz

Foldback frequency

VOUT = 0.75 V

200

230

260

CLKSYNC output high

4.8

5

5.2

V

CLKSYNC output low

0.0

0.4

CLKSYNC sink current

CLKSYNC = 1 V

1.2

2.2

mA

CLKSYNC source current

CLKSYNC = 3 V

–0.2

0.1

CLKSYNC input threshold

CLKSYNC from 5 V to 0 V (edge detect)

2.5

3.0

3.5

V

Error Amplifier

IB

Total bias current; regulating level

–1

1

µA

FB voltage

FB = COMP

2.43

2.5

2.57

V

AVO

50

90

dB

GBW

F = 100 kHz (1)

2.5

5

MHz

Output source current

FB = 2.3 V, COMP = 2.5 V

–0.6

–1.2

mA

Output sink current

FB = 2.7 V, VCOMP = 1 V

0.250

1.5

VOL

IO = 100 µA

0.3

0.9

V

VOL

IO = –100 µA

2.7

3.1

3.5

PWM

Minimum duty cycle

FB = 3 V, CS = 0 V

0%

Maximum duty cycle

FB = 0 V, CS = 0 V

75%

78%

81%

Current Sense

Input bias current (CS)

3.0

µA

CS shutdown threshold

1.235

1.3

1.365

V

CS shutdown hysteresis

20

mV

CS over current threshold

0.95

1

1.05

V

Current/FAULT

Soft start charge current

–10

–20

–30

µA

Soft start discharge current

10

20

30

VOL

0

50

mV

Soft start complete threshold

3.6

4

4.4

V

Soft start restart threshold

0.4

0.5

0.6

(1)

Specified by design. Not 100% tested in production.

4

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