tk75020 Toko Inc., tk75020 Datasheet

tk75020

Manufacturer Part Number

tk75020

Description

Zvs Resonant Controller

Manufacturer

Toko Inc.

Datasheet

1.TK75020.pdf (11 pages)

Current page: 1 of 11
Download datasheet (88Kb)

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

Related parts for tk75020

tk75020 Summary of contents

Page 1

... 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 current limit, off(max) ...

Page 2

... All Pins Except OFF(MAX) ODP and EN (Low Impedance Source) ................... SS ref ODP Pins .......................... OFF(MAX Pin ...................................................................... 16 V Power Dissipation (Note 1) ................................ 500 mW TK75020 ELECTRICAL CHARACTERISTICS Test conditions Temperature Range, Typical numbers apply ...

Page 3

... TK75020 ELECTRICAL CHARACTERISTICS (CONT.) Test conditions Temperature Range, Typical numbers apply ...

Page 4

... TK75020 TK75020 ELECTRICAL CHARACTERISTICS (CONT.) Test conditions Temperature Range, Typical numbers apply ...

Page 5

... DRIVE S DRV Q Q LATCH STAND-BY GATE DISCHARGE CURRENT LIMITER C L CMP 0. LATCH REF ODP CUR SRC BIAS HIGH: DRV ENABLED TK75020 D 1 ZVD DRV C L ODP OVP REF Page 5 ...

Page 6

... TK75020 SUPPLY VOLTAGE PIN ( This pin is connected to the supply voltage. The IC begins normal operation when two conditions are met: 1) the V voltage exceeds 5.6 V and 2) the voltage of the enable pin exceeds 2.2 V. Operation ceases and the IC goes into a UVLO mode when the V voltage drops below 5.3 V. ...

Page 7

... ON and Q into a second mirror formed via Q when the current switch latch 7 8 and transistor Q 1 TK75020 ) INV / SS) ON OUT voltage exceeds the /SS pin and Q . The OFF(MAX) ...

Page 8

... TK75020 mirrored by the transistors Q and Q 9 timing capacitor. The incoming mirror current is diverted from the mirror with transistor Q set. OVERDISSIPATION PROTECTION PIN (ODP) The ODP pin is used to realize a protection against overdissipation of the power MOSFET due to the loss or absence of zero-voltage switching (ZVS). (ZVS can be lost if the load or the input voltage changes too much ...

Page 9

... OPERATION WITHOUT ZVD January 1999 TOKO, Inc. APPLICATION INFORMATION CLAMP 3 1 LATCH Q DRV LATCH Q 2 ODP 0 CMP7 DRV ODP LATCH 3.0 V 1.0 V TON / S.S TK75020 CYCLE-BY-CYCLE CURRENT LIMIT 2 OVERDISSIPATION PROTECTION 0 0 SENSE 3.0 V 1.0 V Page 9 ...

Page 10

... TK75020 APPLICATION INFORMATION (CONT 100 µ (Note 1) Gen. Note not required avalanche rated FET 2 1 Gen. Note: Part #CTX01-13154 (Call Toko Technical Support (719) 528-2200). ...

Page 11

... Mill Plain Road Danbury, CT 06811 Tel: (203) 748-6871 Fax: (203) 797-1223 IC-122-TK75020 0798O0.0K TK75020 Marking Information Marking TK75020 75020 Semiconductor Technical Support Toko Design Center 4755 Forge Road Colorado Springs, CO 80907 Tel: (719) 528-2200 Fax: (719) 528-2375 Page 11 Printed in the USA ...

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