TOKO TK75003DIMG Datasheet

TK75003

75003

PWM CONTROLLER

FEATURES

■ Power Factor Correction/Line Harmonics

Reduction to Meet IEC1000-3-2 Requirements

■ Optimized for Off-Line Operation

■ Maximum Duty Ratio 88% (typ.)

■ Frequency Reduction for Improved Overcurrent

Protection

■ Low Standby Current for Current-Fed Start-Up

■ Current-Mode or Voltage-Mode Control

■ Internal User-Adjustable Slope Compensation

■ Functionally Integrated & Simplified 5-Pin Design

DESCRIPTION

The TK75003 is a simple primary side controller optimized
for off-line switching power supplies including power factor
correctors. It is suitable for both voltage-mode and current­mode control and has advanced features not available in
controllers with a higher pin count. The key to full
functionality in a 5-pin design is that the current signal and
the error signal are added together and fed into the
feedback pin. A sawtooth current flowing out of the feedback
pin provides a slope compensation ramp (in current-mode
applications) or a PWM ramp (in voltage-mode
applications), in proportion to the resistance terminating
that pin. If the sum of the current sense signal, error signal
and ramp signal exceeds the Overcurrent Detector
threshold indicating that the Current Control Detector has
lost control of the switch current, the charging current of
the timing capacitor will be reduced to about 25% for the
remainder of the clock period. The reduced charging
current causes no more than a one-third reduction in
switching frequency, effectively preventing short-circuit
current runaway.

ORDERING INFORMATION

TK75003D

Tape/Reel Code
Temperature Code

TEMP. CODE (OPTIONAL)

I: -40 to +85 C

TAPE/REEL CODE

MG: Magazine

APPLICATIONS

■ Power Factor Correction Converters

■ Off-Line Power Supplies

■ Industrial Power Supplies

■ Telecom Power Supplies

■ Off-Line Battery Chargers

TK75003

DRV

GND NC

GND

T

Note: Pins 2 and 3 must be externally
connected for proper operation.

BLOCK DIAGRAM

I

CT

C

T

FB

I

FR

146 µA

1.35 V

0.98 V

I

CHG

205 µA

I

DS

2 mA

Q

SLOPE

COMPENSATION

OSCILLATOR

R

FREQUENCY
REDUCTION

LATCH

S

OVERCURRENT

DETECTOR

CURRENT
CONTROL

DETECTOR

BANDGAP

REFERENCE

f

CLK

PWM LATCH

S

R

10.5 V

Q

GND

UVLO

14.5 V

V

CC

NC

FBC

V

CC

17.5 V

DRV

January 1999 TOKO, Inc. Page 1

TK75003

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (Low Impedance Source)................ 16 V

Supply Voltage (ICC < 30 mA) ...................... Self Limiting

Power Dissipation (Note 1) ................................ 825 mW

Output Energy (Capacitive Load).............................. 5 µJ

CT and FB Pins ........................................................ 16 V

TK75003 ELECTRICAL CHARACTERISTICS

Test Conditions: VCC = 13 V, CCC = 4.7 µF, CT = 800 pF, C
Typical numbers apply at TA = 25 °C, unless otherwise specified.

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

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

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

Operating Temperature Range ...................-20 to +80 °C

Extended Temperature Range................... -40 to +85 °C

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

= 1000 pF, TA = Tj = Full Operating Temperature Range.

DRV

I
I

V
V
V
V

)TRATS(CC

)NO(CC

)NO(CC

)FFO(CC

TSYH

)PMALC(CC

siseretsyHOLVU 8.20.4V

C(NOITCESROTALLICSO

f

VRD

V

)KP(TC

V

)LV(TC

I

)SID(TC

C

)XAM(T

egatloVkaeP 5.22.39.3V

egatloVyellaV 1.1V

tnerruCylppuSpu-tratSVotecruoStnerruC

tnerruCylppuSgnitarepO 5.410.91Am

NOegatloVOLVUVCC)3etoN(,drawpUspeewS5.215.410.61V

FFOegatloVOLVUV

egatloVpmalClanretnII

)NIP

T

niPVRDtaycneuqerF

CC

T

AT=j

T

AT=j

CC

C°52=09001011zHk

tnerruCegrahcsiD 0.18.10.3Am

ecnaticapaCgnimiTmumixaM 7.4Fn

niP5.00.1Am

CC

drawnwoDspeewS0.95.010.21V

)3etoN(,Am52=0.615.710.91V

)C°08ot02-(egnaRlluF=08511zHk

)NIPBF(SNOITCESNOITCUDERYCNEUQERFDNAKCABDEEF,ROTCETEDTNERRUC

T

V

DCC

V

DCO

t

DP,CO,BF

t

DP,CC,BF

i

)KP(CS

tnerruC

rotceteDlortnoCtnerruC

egatloVecnerefeR

rotceteDtnerrucrevO

egatloVecnerefeR

kaePnoitasnepmoCepolS

AT=j

T

AT=j

T

AT=j

T

AT=j

niPVRDotyaleDnoitagoporPV

BF

niPVRDotyaleDnoitagoporPVBF)4etoN(,V02.1ot0morfspetS08081sn

V=

V

TC

C°52=059.0089.0010.1V

)C°08ot02-(egnaRlluF=529.0530.1V

C°52=023.1053.1083.1V

)C°08ot02-(egnaRlluF=503.1593.1V

V2ot0morfspetS06031sn

)KP(TC

T,

AT=j

)2etoN(,C°52=542-002-551-Aµ

i

)LV(CS

i

)LV-KP(CS

tnerruC

yellaV

yellaVnoitasnepmoCepolS

otkaePnoitasnepmoCepolS

V=

V

TC

V=

V

TC

)LV(TC

)LV(TC

T,

AT=j

T,

AT=j

)2etoN(,C°52=56-04-51-Aµ

)2etoN(,C°52=002-061-021-Aµ

Page 2 January 1999 TOKO, Inc.

TK75003 ELECTRICAL CHARACTERISTICS (CONT.)

Test Conditions: VCC = 13 V, CCC = 4.7 µF, CT = 800 pF, C
Typical numbers apply at TA = 25 °C, unless otherwise specified.

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 1000 pF, TA = Tj = Full Operating Temperature Range.

DRV

)GNIMITNOITCETORPTNERRUCREVO(RECUDERYCNEUQERF

TK75003

f

f/

)RF(VRD

VRD

oitaR

noitcudeRycneuqerF

V

BF

V6.1,V2.1=020304%

)NIPVRD(NOITCESTUPTUO

D

t
t

V

V

Note 1: Power dissipation is 825 mW when mounted. Derate at 6.6 mW/°C for operation above 25 °C.
Note 2: For temperature dependence refer to "Slope Compensation Peak Current vs. Temperature" graph.
Note 3: The UVLO "on" voltage is guaranteed always to be below the internal clamp voltage.
Note 4: Guaranteed by design; not 100% tested.

)XAM(VRD

)ESIR(VRD

)LLAF(VRD

)HGIH(VRD

)WOL(VRD

emiTesiRV,daolFp0001

emiTllaFV,daolFp0001

oitaRytuDmimixaM588819%

CC

CC

I

HGIHegatloVtuptuO

WOLegatloVtuptuO

VRD

I

VRD

I

VRD

I

VRD

I

VRD

Am04-=1.010.11V

Am001-=0.018.01V

Am04=1.052.0V

Am001=2.005.0V

,Am5=VCCV9=0.105.1V

V51=5257sn
V51=5257sn

January 1999 TOKO, Inc. Page 3

TK75003

TEST CIRCUIT

(mA)

CC

I

0.6

0.4

20

16

12

SUPPLY CURRENT

VS.

SUPPLY VOLTAGE

DEVICE ON

STANDBY

OSCILLOSCOPE

1000 pF

C

800 pF

DRV

GND

GND

T

OSCILLOSCOPE

T

V

CC

NC

NC

FBC

1 µF

20 k

C

CC

4.7 µF

TYPICAL PERFORMANCE CHARACTERISTICS

FREQUENCY AT DRV PIN

TIMING CAPACITANCE

6

10

5

10

TA = 85 °C

4

10

FREQUENCY (Hz)

TA = -40 °C

VS.

CURRENT CONTROL REFERENCE

1.00

0.98

(V)

0.96

CCD

V

0.94

0.92

VS.

TEMPERATURE

0.0
0 4 8 12 16 18

VCC (V)

SLOPE COMPENSATION PEAK

CURRENT

VS.

TEMPERATURE

10

10 100 1000 10000

CT (pF)

INPUT CURRENT

VS.

FREQUENCY AT DRV

60

0.90

-40 0 40 80 120
TEMPERATURE (°C)

FREQUENCY REDUCTION RATIO

TEMPERATURE

50

3

-100
50

-140

(µA)

-180

SC(PK)

i

-220

-260

-40 0 40 80 120
TEMPERATURE (°C)

40

(mA)

CC

I

30

C

DRV

= 1 nF

C

DRV

20

C

10

0 400 800 1200 1600

FREQUENCY (kHz)

= 500 pF

= 0 nF

DRV

48

46

FREQ. REDUCTION RATIO (%)

44

-40 0 40 80 120
TEMPERATURE (°C)

Page 4 January 1999 TOKO, Inc.

VS.

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

SLOPE COMPENSATION RAMP

RFB = 3 K to GND

600

CT = 800 pF

450

(mV)

300

FB

V

150

0

0 5 10 15 20

TIME (µs)

i

SC(PK)

i

SC(PK - VL)

i

SC(VL)

TK75003

January 1999 TOKO, Inc. Page 5