UCC28521 datasheet(4/32 Pages) TI

Part #	UCC28521

Description	ADVANCED PFC/PWW COMBINATION CONTROLLER WITH TRAILING-EDGE/TRAILING-EDGE MODULATION

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Manufacturer	TI [Texas Instruments]

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UCC28521, UCC28528

SLUS608B − JANUARY 2005 REVISED JUNE 2005

4

www.ti.com

ELECTRICAL CHARACTERISTICS

TA = –40°C to 105°C for the UCC2851x, TA = TJ, VCC = 12 V, RT = 156 kΩ, RCT_BUFF = 10 kΩ

(unless otherwise noted)

supply current

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Supply current, off

VCC turn-on threshold −300 mV

100

150

µA

Supply current, on

no load on GT1 or GT2

4

6

mA

undervoltage lockout (UVLO)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

VCC turn-on threshold

UCC28521

9.7

10.2

10.8

VCC turn-off threshold

UCC28521

9.1

9.7

10.6

V

UVLO hysteresis

UCC28521

0.3

0.5

0.8

V

voltage amplifier

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Input voltage

25

°C

7.39

7.50

7.61

V

Input voltage

Over temperature

7.35

7.50

7.65

V

VSENSE bias current

VSENSE = VREF

100

300

nA

Open loop gain

2 V

≤ VAOUT ≤ 4 V

50

60

dB

High-level output voltage

ILOAD = –150 µA

5.3

5.5

5.6

V

Low-level output voltage

ILOAD = 150 µA

0.00

0.05

0.15

V

gM conductance

IVAOUT = −20 µA to 20 µA

70

100

130

µS

Maximum source current

−1

−3.5

mA

Maximum sink current

1

3.5

mA

PFC stage overvoltage protection and enable

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Overvoltage reference window

VREF

+ 0.440

VREF

+ 0.490

VREF

+ 0.540

V

Hysteresis

300

500

600

mV

Enable threshold

1.7

1.9

2.1

V

Enable hysteresis

0.08

0.2

0.3

V

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