TK75020TL/75020 TOKO [TOKO, Inc], TK75020TL/75020 Datasheet

TK75020TL/75020

Manufacturer Part Number

TK75020TL/75020

Description

ZVS RESONANT CONTROLLER

Manufacturer

TOKO [TOKO, Inc]

Datasheet

1.TK75020TL75020.pdf (11 pages)

Current page: 1 of 11
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FEATURES

DESCRIPTION

The TK75020 is a low-cost, high-performance Zero-Voltage

Switching (ZVS) controller IC. The primary applications

are in inverters for Cold Cathode Fluorescent Lamps

(CCFL) and in ZVS quasi-resonant or multi-resonant

converters. The combination of a unique (patent-pending)

control concept and a ZVS resonant inverter generates

low-distortion sine wave for the fluorescent lamp, leading

to extended lamp life and high luminous efficiency. The IC

features all necessary circuits of a controller for such

applications, including externally adjustable timing

parameters (frequency, T

Soft-Start, enable, error amplifier, and a trimmed reference.

The same reference is used for undervoltage protection

and other critical internal biases. Supply current in the “off”

mode is kept at a minimum level (2 A typical). Special

care has been taken to avoid undesirable turn-on of the

external power MOSFET when sufficient supply voltage is

not available, or when the device is held in the off mode.

Even with no V

January 1999 TOKO, Inc.

Optimized for Off-Line and Battery Powered

Operation

Internal Zero-Voltage Detector

Soft-Start

Pulse-by-Pulse Current Limit

Overdissipation Protection with Soft-Start

Overvoltage Protection with Soft-Start

Low-Current Standby mode

Programmable On/Off Timing

Enable Control

ORDERING INFORMATION

applied, the drive pin of the IC will sink in

TK75020

on(min)

, T

off(max)

Tape/Reel Code

), current limit,

TAPE/REEL CODE

TL: Tape Left

APPLICATIONS

excess of 20 mA while maintaining the voltage below 1 V

to prevent that leakage currents turn on the power MOSFET.

An internal zero-voltage detector monitors the voltage

across the MOSFET and ensures that the turn-on will only

take place under zero-voltage conditions. A unique

overdissipation protection prevents the overheating of the

power MOSFET in case the zero-voltage switching is lost.

The TK75020 is available in a 14-lead surface mount

package.

Cold Cathode Fluorescent Lamps

Resonant Power Supplies

Power Supplies for Notebook Computers

Power Supplies for Personal Electronics

ZVS RESONANT CONTROLLER

TK75020

T OFF(MAX)

T ON /SS

DRV

GND

OVP

C T

TK75020

V CC

V ref

C L

ZVD

EA OUT

EA INV

ODP

Page 1

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