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.
9
8
7
6
5
4
3
2
1
V
V
PULSE OUTPUT
DC OUTPUT
GROUND
EXTERNAL FUNCTION
I SIMULATION
INPUT CONTROL
ZERO CROSSING
IN
REF
C
SIP9
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
INPUT CONTROL
SIMULATION
EXTERNAL FUNCTION
DC OUTPUT
PULSE OUTPUT
VREF
IC
VIN
ZERO CROSSING
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
GROUND
DIP 9+9
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
8
TRIGGER
START
HOLD
BASE
CURRENT
AMPLIFIER
7
COUPLING -C-
CHARGING
CIRCUIT
CONTROL
LOGIC
5432
START-UP
CIRCUIT
VOLTAGE
CONTROL
1
9
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
V
7
,V
8V
9
I
2
,I
3–3,3 mA
I
45mA
I
55mA
I
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
C)
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
V
9
=5V
V
9
=10V 1.5
2.4
0.5
2.0
3.2
mA
mA
mA
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
mA
Vref Voltage Reference at Pin 1 I1< 0.1mA
I1= 5mA 4
44.2
4.2 4.5
4.4 V
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
1
2−0.1 V1
2V
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
0
0.5
0
1
2
3
0
2
4
6
8
V
V4
V8
V
t
t
t
R
V = -10V
=0
R
V
4601-05.EPS
TestDiagram : Overload Operation
100kΩ
20kΩ
12
2.2kΩ
3
22pF
1kΩ
67 854
10kΩ
0.68Ω
100kΩ
1µF
10nF
9
10µF27Ω
D8 1N4003
10µF
V9
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
10
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
9
713 11
1
15
16 2
2.7Ω
4.7nF4.7nF
10kΩ(2)
220VAC
270pF
18V
470µF
BY258
-600
12
270pF
470µF
BY258
-600
56kΩ
270pF
470µF
BY258
-600
270pF
470µF
BY258
-600
25V 150V 200V 56kΩ
64
MAINS SEPARATION
V4 1
V
2
V
S1
33Ω
120Ω
3
V
S1
S3
470Ω
1.5kΩ
S2
S1
6.8k Ω
S1
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
80
60
40
20
0 20406080100120
f (kHz)
P(W)
O
4601-07.EPS
Figure3 : Frequency versus Output Power
(Test Circuit of Figure 2)
100
80
60
40
20
0 20 40 60 80 100 120
η(%)
P (W)
O
4601-08.EPS
Figure 4 : Efficiencyversus OutputPower
(Test Circuit of Figure 2)
160
120
80
40
0 200 400 600 800 1000 1200
V(V)
O2
I (mA)
O2
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)
O2
V (V)
mains
4601-10.EPS
Figure 6 : OutputVoltage V2(mainschange)
(Test Circuit of Figure 2)
l
COPPER AREA
35µTHICKNESS
4601-11.EPS
Figure7 : Exampleof a PC Heatsink (35°C/W)
TDA4601
6/8
B
e3
a1 L1
D
d1
b1
C
b3
N
L
L2
e
c2
c1
19
M
L3
A
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
19
a1
Be
D
Z
b
Ze3
F
b1
E
IL
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.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
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.
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - China - France - Germany - Hong Kong - Italy -Japan - Korea - Malaysia - Malta - Morocco
The Netherlands - Singapore - Spain - Sweden - Switzerland -Taiwan - Thailand - United Kingdom - U.S.A.
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
