TDA4601B - STMicroelectronics

TDA4601

SWITCH-MODEPOWER SUPPLY CONTROLLER

September 1993

4601-01.EPS- 4601-02.EPS

PINCONNECTIONS

SIP9

(Plastic Package)

ORDER CODE : TDA4601

.LOW START-UP CURRENT

.DIRECT CONTROL OF SWITCHING TRAN-

SISTOR

.COLLECTOR CURRENT PROPORTIONAL

TO BASE-CURRENT INPUT

.REVERSE-GOING LINEAR OVERLOAD

CHARACTERISTICCURVE

DESCRIPTION

The TDA4601 is a monolithic integrated circuit

desi-gned to regulate and control the switching

transistorin a switching power supply.

Because of its wide operational range and high

vol-tagestability evenat highload changes,thisIC

can be used not only in TV receivers and video

recorders but also in power supplies in Hi-Fi sets

and active speakers.

PULSE OUTPUT

DC OUTPUT

GROUND

EXTERNAL FUNCTION

I SIMULATION

INPUT CONTROL

ZERO CROSSING

REF

SIP9

INPUT CONTROL

SIMULATION

EXTERNAL FUNCTION

DC OUTPUT

PULSE OUTPUT

VREF

VIN

ZERO CROSSING

GROUND

DIP 9+9

(Plastic Package)

ORDER CODE : TDA4601B

1/8

ZERO PASSAGE

IDENTIFICATION

OVERLOAD

IDENTIFICATION

REFERENCE

VOLTAGE

COLLECTOR

CURRENT

SIMULATION

STANDBY

OPERATION

CONTROL

AMPLIFIER

EXTERNAL

BLOCKING

FUNCTION

BASE

CURRENT

SWITCH-OFF

TRIGGER

START

HOLD

BASE

CURRENT

AMPLIFIER

COUPLING -C-

CHARGING

CIRCUIT

CONTROL

LOGIC

5432

START-UP

CIRCUIT

VOLTAGE

CONTROL

610to18

4601-03.EPS

4601-03.TBL

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V9Supply Voltage 20 V

V1Reference Output 6 V

V2Identification Input – 0.6, 0.6 V

V3Controlled Amplifier 3 V

V4,V

58V

3–3,3 mA

45mA

55mA

71.5 A

I8– 1.5 A

Toper Operating Ambient Temperature 0, 85 °C

Tstg Storage Temperature – 40, 150 °C

TjJunction Temperature – 40, 125 °C

4601-01.TBL

THERMAL DATA

Symbol Parameter Value Unit

Rth (j–c) Thermal Resistance Junction-pins Max. 15 °C/W

Rth (j–a) Thermal Resistance Junction–ambient Max. 70 °C/W

4601-02.TBL

ELECTRICAL CHARACTERISTICS (Tamb =25o

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V9Operating Supply Voltage Range 7.8 18 V

START CONDITION (according to test circuitof fig. 1)

I9Supply Current (V1not yet switched on) V9=2V

=5V

=10V 1.5

2.4

0.5

2.0

3.2

V9Switch Threshold (V1) 11 11.8 12.3 V

TDA4601

2/8

ELECTRICAL CHARACTERISTICS (Tamb =25o

C ) (continued)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

NORMAL OPERATION (V9= 10V, Vcont = –10V, Vclock =±0.5V, f = 20kHz, duty cycle 1:2 after switch on)

I9Supply Current Vcont = – 10V

Vcont =0V 110

50 135

75 160

100 mA

Vref Voltage Reference at Pin 1 I1< 0.1mA

I1= 5mA 4

44.2

4.2 4.5

4.4 V

V3Control Voltage Vcont = 0V 2.3 2.6 2.9 V

V4Collector Current Simulation Voltage Vcont = 0V, see note 1 1.8 2.2 2.5 V

∆V4Collector Current Simulation Voltage Vcont = 0V to –10V, see note 1 0.3 0.4 0.5 V

V5External Protection Threshold 6 7 8 V

V7Pin 7 Output Voltage Vcont = 0V, see note 1 2.7 3.3 4.0 V

V8Pin 8 output Voltage Vcont = 0V, see note 1 2.7 3.4 4.0 V

∆V8Pin 8 Output Voltage Change Vcont = 0V to –10V, see note 1 1.6 2 2.4 V

V2Feedback Voltage see note 1 0.2 V

TK1 Reference Voltage Temperature Coefficient 10–3 1/oK

PROTECTION OPERATION (V9= 10V ; Vcont = – 10V ; Vclock =±0.5V ; f = 20kHz ; duty cycle 1 : 2)

I9Supply Current V5≤1.8 V 14 22 28 mA

V7Switch–off Voltage V5≤1.8 V 1.3 1.5 1.8 V

V4Switch-off Voltage V5≤1.8 V 1.8 2.1 2.5 V

V5Blocking Voltage Vcont =0V V

2−0.1 V1

V9Supply Voltage for V8Blocked Vcont = 0 V 6.7 7.4 7.8 V

∆V9Supply Voltage for V1off While Further

Decreasing V90.3 0.6 1 V

ELECTRICAL CHARACTERISTICS (according to test circuit of fig. 2)

ton Secondary Voltage Switching Time 350 450 ms

∆V2Voltage Variation with Load S3Closed, P3= 20 W 0.1 0.5 V

S2Closed, P2= 15 W 0.5 1 V

∆V2Stand by Condition S1Open Pload =3W 20 30 V

f Stand by Frequency 70 75 kHz

PPPrimary Power Consumption in Stand by

Condition 10 12 VA

4601-04.TBL

Note 1: Only DC component

10 20 30 40 60 70 80

0.5

V = -10V

4601-05.EPS

TestDiagram : Overload Operation

100kΩ

20kΩ

2.2kΩ

22pF

1kΩ

67 854

10kΩ

0.68Ω

100kΩ

1µF

10nF

10µF27Ω

D8 1N4003

10µF

Vcont

VREF I1V

18 17 16 15 14 13 12 11 10

4601-04.EPS

Figure 1 : TestCircuit

TDA4601

3/8

123456789

101112131415161718

TDA4601

22pF

200Ω

1.2kΩ100µF

6V 12

kΩ

270kΩ

220µF (3)

C2540

B250/

C1000

0.68Ω

1N4007

10kΩ/3W

100µF / 25V

100

kΩ

1N4007 100µF / 16V

27Ω4.7µH

10nF (1)

22nF

BU508

BY258-200

1µF / 35V

8.2nF BY295-450

100Ω

713 11

16 2

2.7Ω

4.7nF4.7nF

10kΩ(2)

220VAC

270pF

18V

470µF

BY258

-600

270pF

470µF

BY258

-600

56kΩ

270pF

470µF

BY258

-600

270pF

470µF

BY258

-600

25V 150V 200V 56kΩ

MAINS SEPARATION

V4 1

33Ω

120Ω

470Ω

1.5kΩ

6.8k Ω

100Ω

56kΩ

AZV

61-IC

4601-06.EPS

(1) C limits the max. collector current of BU508 at overshooting the permissible output power.

(2) Adjustementof secondaryvoltage.

(3) Must be discharged before IC change.

Figure 2 : Test andApplicationCircuit

TDA4601

4/8

CIRCUIT DESCRIPTION

TheTDA4601 regulates,controls,and protectsthe

switching transistor in reverse converter power

supplies at starting, normal, and overload opera-

tion.

Starting Behaviour

During the start-up, three consecutive operation

states are passed.

1. An internal reference voltage is built up which

supplies the voltage regulator and enables the

supply to the coupling electrolytic capacitorand

the switching transistor. Up to a supply voltage

of V9≈12V,the current I9is less than3.2mA.

2.Release of the internal reference voltage

V1= 4V. This voltage is abruptly available when

V9≈12V and enables all parts of the IC to be

supplied from the control logic with a thermally

stable and overloadprotected current supply.

3.Release of control logic. As soon as the

reference voltage is available, the control logic

is switchedonthroughan additionalstabilization

circuit. Thus, the IC is ready for operation.

This start-up sequenceis necessaryto guarantee

the supplythrough the couplingelectrolyticcapaci-

tor to the switchingtransistor.Correct switching of

the transistoris only guaranteedin this way.

Normal Operation

Zero crossing of the feedbackcoil is registered at

pin 2 and passed to the control logic.

Atpin 3(regulationof input,overload, and standby

recognition)therectifiedamplitudevariationsofthe

feedbackcoil are applied. The regulating amplifier

works with an input voltage of about 2V and a

currentof about 1.4 mA.

Togetherwith thecollectorcurrentsimulationpin 4,

the overload recognition defines the operating re-

gion of the regulating amplifier depending on the

internal reference voltage. The simulation of the

collector current is generated by an external RC

network at pin 4 and internally set threshold volt-

ages. By increasing the capacitance (10nF) the

max. collector current of the switching transistor

rises, thus setting the required operating range.

The extent of the regulation lies between a 2V

clamped DC voltage and an AC voltage rising in a

sawtooth waveform,whichmay vary up to a maxi-

mum amplitude of 4V (ref. voltage).

Areductionofthesecondaryloaddownto20 watts

causes the switching frequency to rise to about

50kHz at an almost constant pulse duty factor

(periodto on-timeapprox.3).Afurtherreductionof

the secondaryload down to about1 watt results in

changing the switching frequency to approx.

70kHz,and additionallythe pulse duty factorrises

to approx. 11.At the same time the collector peak

current falls below 1A.

In the trigger the output level of the regulating

amplifier, the overload recognition, and the collec-

tor current simulation are compared and instruc-

tions are given to the control logic. There is an

additional triggering and blocking possibility by

means ofpin 5. Theoutput at pin 8 is blockedat a

voltage of lessthan 2.2Vat pin 5.

Dependingonthestart-upcircuit,thezerocrossing

identification, and the release with the aid of the

trigger, the control logic flip flops are set which

control the base current amplifier and the base

current shut-down. The base current amplifier

moves the sawtooth voltage V4to pin 8. Acurrent

feed-back having an external resistance of R =

0.68Ωis inserted between pin 8 and pin 7. The

resistance value determines the maximum ampli-

tude of the base driving current for the switching

transistor.

Protective Measures

The base current shut-down,releasedby the con-

trol logic, clamps the output of pin 7 at 1.6V and

thus blocksdriving of the switching transistor.This

protective measure will be released if the voltage

at pin 9 reaches a value ≤typ. 7.4V or if voltages

of ≤typ. 2.2V occur at pin 5. In the caseof a short

circuitof the secondarywindings of theP.S.U., the

IC continuouslymonitors the fault condition.

With the load completely removed from thesecon-

dary winding of the P.S.U., the IC is set to a low

pulse duty factor.The total power consumption of

the P.S.U. is held below 6 to 10 watts in both

operatingconditions. After having blocked the out-

put, causedatasupplyvoltage≤typ.7.4V,afurther

voltagereductionwith∆V9=0.6V resultsin switch-

ing off the reference voltage (4V).

TDA4601

5/8

0 20406080100120

f (kHz)

P(W)

4601-07.EPS

Figure3 : Frequency versus Output Power

(Test Circuit of Figure 2)

100

0 20 40 60 80 100 120

η(%)

P (W)

4601-08.EPS

Figure 4 : Efficiencyversus OutputPower

(Test Circuit of Figure 2)

160

120

0 200 400 600 800 1000 1200

V(V)

I (mA)

Vmains = 180V

Vmains = 220V

Vmains = 250V

4601-09.EPS

Figure5 : Load CharacteristicsV2-f (Iq2)

(Test Circuit of Figure 2)

151

150

149

148

147150 170 190 210 230 250 270

V(V)

V (V)

mains

4601-10.EPS

Figure 6 : OutputVoltage V2(mainschange)

(Test Circuit of Figure 2)

COPPER AREA

35µTHICKNESS

4601-11.EPS

Figure7 : Exampleof a PC Heatsink (35°C/W)

TDA4601

6/8

a1 L1

PM-SIP9.EPS

PACKAGE MECHANICAL DATA

9 PINS- PLASTICSIP

Dimensions Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A 7.1 0.280

a1 2.7 3 0.106 0.118

B 24.8 0.976

b1 0.5 0.020

b3 0.85 1.6 0.033 0.063

C 3.3 0.130

c1 0.43 0.017

c2 1.32 0.052

D 21.2 0.835

d1 14.5 0.571

e 2.54 0.100

e3 20.32 0.800

L 3.1 0.122

L1 3 0.118

L2 17.6 0.693

L3 0.25 0.010

M 3.2 0.126

N 1 0.039

SIP9.TBL

TDA4601

7/8

18 10

Ze3

PMDIP18W.EPS

PACKAGE MECHANICAL DATA

18 PINS- PLASTICPOWERDIP

Information furnished is believed to be accurate and reliable. However,SGS-THOMSON Microelectronics assumes no responsibility

for the consequences of use of suchinformation nor for any infringement of patents or other rights of third parties which may result

from its use. No licence is granted by implication or otherwiseunder anypatent or patent rights of SGS-THOMSON Microelectronics.

Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all

information previously supplied.SGS-THOMSON Microelectronics products are not authorized for use as critical componentsin life

support devices or systems without express written approval of SGS-THOMSON Microelectronics.

Purchase of I2C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips

I2C Patent.Rights to usethese components in a I2C system,is granted provided that the system conforms to

the I2C Standard Specificationsas defined by Philips.

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Dimensions Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

a1 0.51 0.020

B 0.85 1.4 0.033 0.055

b 0.5 0.020

b1 0.38 0.5 0.015 0.020

D 24.8 0.976

E 8.8 0.346

e 2.54 0.100

e3 20.32 0.800

F 7.1 0.280

i 5.1 0.201

L 3.3 0.130

Z 2.54 0.100

DIP18PW.TBL

TDA4601

8/8