TOKO TK75020TL Datasheet

TK75020

ZVS RESONANT CONTROLLER

FEATURES

■ 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

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 µA 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 Vcc applied, the drive pin of the IC will sink in

on(min)

, T

), current limit,

off(max)

APPLICATIONS

■ Cold Cathode Fluorescent Lamps

■ Resonant Power Supplies

■ Power Supplies for Notebook Computers

■ Power Supplies for Personal Electronics

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.

TK75020

ORDERING INFORMATION

TK75020

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

75020

T

OFF(MAX)

TON/SS

DRV
GND

OVP

EN
C

V

CC

V

ref

C

L

ZVD

T

EA
EA
ODP

OUT
INV

January 1999 TOKO, Inc. Page 1

TK75020

ABSOLUTE MAXIMUM RATINGS

All Pins Except TON / SS, T

ODP and EN (Low Impedance Source) ................... 16 V

TON / SS, T

, ref, CT, ODP Pins.......................... 6 V

OFF(MAX)

EN Pin ...................................................................... 16 V

Power Dissipation (Note 1) ................................ 500 mW

TK75020 ELECTRICAL CHARACTERISTICS

Test conditions: V
Temperature Range, Typical numbers apply at TA = 25 °C, unless otherwise specified.

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 12 V, VEN = 2.4 V, CT = 360 pF, I

CC

OFF(MAX)

, V

REF

, CT,

Maximum Current (VCC and ZVD Pins).................. 20 mA

Storage Temperature Range ................... -55 to +150 °C

Operating Temperature Range ...................-20 to +85 °C

Junction Temperature .......................................... 150 °C

Lead Soldering Temperature (10 s) ..................... 235 °C

TON / SS

= I

TOFF(MAX)

= 50 µA, DRV is Open, TA = Full Operating

I

)FFO(CC

I
I

I

I

)H,FFO(CC

)OLVU(CC

)NO(CC

)VRD,NO(CC

V

)NO(CC

V

)FFO(CC

V

)TSYH(CC

FFOtnerruCylppuSV

HGIH,FFOtnerruCylppuSV

edoMOLVU,tnerruCylppuSV

V

NOtnerruCylppuS

V

VRD,NOtnerruCylppuS

V0=2001Aµ

NE

NE

CC

CC

CC

V,V0=

CC

V5=0070001Aµ
V6=7.46Am

V<V6

CC

C,V6=

V<V6

CC

V61=2Am

V61<8Am

VRD

Fn1=6.58Am

V61<01Am

dlohserhThgiHOLVU2.56.50.6V

dlohserhTwoLOLVU0.53.56.5V

siseretsyHOLVU08005Vm

)NIPNE(NOITCESFFO/NO

V

NE

I

NE

V

fer

|∆V
|∆V
I

Note 1: Power Dissipation is 500 mW when mounted as recommended. Derate at 4 mW/°C for operation above 25°C.
Note 2: Guaranteed by design.

|noitalugeRdaoLI<Am1-

)DAOL(fer

|noitalugeReniLV<V6

)ENIL(fer

)CS(fer

egatloVdlohserhTV<V6

tnerruCtupnI

V(NOITCESECNEREFER

FER

tnerruCtiucriCtrohSV

V61<4.04.2V

CC

V

NE

V

NE

V4.2=4Aµ

)2etoN(,V0=001-An

)NIP

T

egatloVtuptuOecnerefeRI

Am0=

fer

CC

V0=21-Am

fer

A

T

A

Am0<0.4Vm

fer

V61<51Vm

C°52=8.30.42.4V

egnaRlluF=7.30.43.4V

Page 2 January 1999 TOKO, Inc.

TK75020 ELECTRICAL CHARACTERISTICS (CONT.)

Test conditions: V
Temperature Range, Typical numbers apply at TA = 25 °C, unless otherwise specified.

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 12 V, VEN = 2.4 V, CT = 360 pF, I

CC

)NIPVRD(NOITCESEVIRD

TON / SS

= I

TOFF(MAX)

= 50 µA, DRV is Open, TA = Full Operating

TK75020

V

V

I
I

t

ESIR

t

LLAF

V

)fer(AE

I

)VNI(AE

V
A

LO

WBGtcudorPhtdiwdnaB-niaG

I

)HGIH(VRD

)WOL(VRD

)KP,CRS(VRD

)KP,KNIS(VRD

egatloVhgiHtuptuO

egatloVwoLtuptuO

tnerruCecruoSkaePC

tnerruCkniSkaePC

emiTesiRC

emiTllaFC

AE(NOITCESREIFILPMARORRE

VNI

VRD

I

VRD

I

VRD

I

VRD

I

VRD

V

NE

VRD

VRD

VRD

VRD

AEDNA

TUO

ecnerefeRlanretnItnelaviuqE

egatloV

Am02-=0.90.01V

Am001-=8.9V

Am02=3.06.0V

Am002=8.15.2V

V,Am02=

CC

V0=

roV0=

9.03.1V

Fn01=005Am

Fn01=007Am
Fn1=07021sn
Fn1=5257sn

)SNIP

91.162.103.1V

tnerruCsaiB 01.0Aµ

)WOL,TUO(AE

WOLegatloVtuptuOI

)TUO(AE

niaGpooLnepOk51 Ω AEmorF

k51 Ω AEmorF

)2etoN(

V,Am1-=

VNI

TUO

TUO

V5.1=52.0V
Tot
Tot

SS/07Bd

NO

,SS/

NO

2zHM

RSSPoitaRnoitcejeRylppuSrewoPV6 ≤ VCC≤ V6156Bd

C(NOITCESTIMILTNERRUC

I

LC

V

)HT(LC

t

)VRD(LC

I

V
V
V

)CS(SS/NOT

SS/NOT

)HT(SS

)HT(HCD

tnerruCsaiBV

VRDotyaleDV

egatloVniPI

)NIP

L

V0=2.0-Aµ

LC

egatloVdlohserhT 081012042Vm

LC

T(NOITCESTRATS-TFOSDNAGNITTESEMIT-NO

NO

tnerruCtiucriCtrohSV

SS/NOT

SS/NOT

)NIPSS/

V0=5.2-Am

Am0=8.10.22.2V

Vm004ot0morFspetS051sn

dlohserhTtratS-tfoS 04.056.009.0V

dlohserhTegrahcsiDPDO 0.14.19.1V

January 1999 TOKO, Inc. Page 3

TK75020

TK75020 ELECTRICAL CHARACTERISTICS (CONT.)

Test conditions: V
Temperature Range, Typical numbers apply at TA = 25 °C, unless otherwise specified.

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 12 V, VEN = 2.4 V, CT = 360 pF, I

CC

TON / SS

= I

TOFF(MAX)

= 50 µA, DRV is Open, TA = Full Operating

T(NOITCESGNITTESEMIT-FFOMUMIXAM

I

V

V
V

)XAM,FFO(T

)XAM,FFO(T

)WOL(TC

)HGIH(TC

egatloVniPI

C(NOITCESGNIMIT

)NIP

T

tnerruCtiucriCtrohSV

egatloVdlohserhTwoL9.00.11.1V

egatloVdlohserhThgiH7.20.33.3V

)NIP

)XAM(FFO

V0=5.2Am

)XAM,FFO(T

)XAM,FFO(T

Am0=8.10.22.2V

fycneuqerFrotallicsO511041561zHk

CotoitaRrefsnarTtnerruC

,niP

RTC

NOT

RTC

)XAM(FFOT

gnitteSemit-nO

gnitteSemit-ffOxaM

T

CotoitaRrefsnarTtnerruC

T

V

,niP

V

V4=2.6-5.5-8.4-

TC

V0=57.452.557.5

TC

)NIPDVZ(NOITCESROTCETEDEGATLOVOREZ

V

)HT(DVZ

I

DVZ

t

)VRD(DVZ

tnerruCtupnIV

VRDotyaleD

dlohserhTwoLrotceteDT

A

V

DVZ

C

VRD

C°52=8.10.22.2V

V2=05-0Aµ

DVZ

,V0ot5morFspetS

Fn1=

071003sn

)NIPPDO(NOITCESROTCETEDNOITAPISSIDREVO

V

)HT(PDO

I

)GVA(PDO

tnerruCegarevAT,zHk001=f

egaloVdlohserhTnoitceteD54.007.059.0V

PALREVO

sn002=6.0Aµ

)NIPPVO(NOITCESROTCETEDEGATLOVREVO

V

)HT(PVO

t

)D(PVO

VRDotylaeD 053008sn

egaloVdlohserhTnoitceteD6.30.43.4V

Page 4 January 1999 TOKO, Inc.