January 1999 TOKO, Inc.

Page 1

TK75005

OSCILLATOR

FB

CT

ICHG

175 µA

fCLK

SLOPE

COMPENSATION

2.6 V

PWM LATCH

DRV

CURRENT

CONTROL

DETECTOR

OVERVOLTAGE

DETECTOR

GND

BANDGAP

REFERENCE

UVLO

10.0 V

8.0 V

VCC

ICT

1.02 V

S

Q

IDS

1.975 mA

OVP

EAIN

EAOUT

R

2.5 V

GM STAGE

OVP

DRV

EAIN

VCC

GND

EAOUT

FB

CT

OVP

DRV

EAIN

VCC

GND

EAOUT

FB

CT

APPLICATIONS

s Power Factor Correction Converters

s Off-Line Power Supplies

s Industrial Power Supplies

s Off-Line Battery Charger

FEATURES

s Can Be Used For Power Factor Correction/Line

Harmonics Reduction to Meet IEC1000-3-2

Requirements

s Maximum Duty Ratio 89% (typ.)

s Low Standby Current for Current-Fed Start-Up

s Current-Mode or Voltage-Mode Control

s Internal User-Adjustable Slope Compensation

s Pulse-by-Pulse Current Limiting

TK75005

BLOCK DIAGRAM

DESCRIPTION

The TK75005 is an 8-pin PWM controller suitable for both

voltage-mode and current-mode control. It also has

advanced features not available in controllers with a higher

pin count. One such feature is a sawtooth current flowing

out of the feedback pin (FB), which provides a slope

compensation ramp (in current mode applications) in

proportion to the resistance terminating that FB pin.

The TK75005 offers the same features as the TK75003

with the addition of the Error Amplifier and the Overvoltage

Protection (OVP) functions, and the deletion of the

Overcurrent Frequency Reduction feature.

This PWM has features similar to the UC3842 (please

refer to UC3842 Comparison Section).

ADVANCED

INFORMATION

75005

75005

SOP-8

DIP-8

ORDERING INFORMATION

TAPE/REEL CODE

TL: Tape Left

MG: Magazine

Tape/Reel Code

TK75005

PACKAGE CODE

D: DIP-8

M: SOP-8

TEMPERATURE RANGE

C: -40 TO 80 C

Temp. Range

Package Code

LOW-COST FLEXIBLE PWM CONTROLLER