TDA4601
SWITCH-MODE POWER SUPPLY CONTROLLER
..
.
.
LOW START-UP CURRENT
DIRECT CONTROL OF SWITCHING TRANSISTOR
COLLECTOR CURRENT PROPORTIONAL
TO BASE-CURRENT INPUT
REVERSE-GOING
LINEAR
OVERLOAD
CHARACTERISTIC CURVE
SIP9
(Plastic Package)
ORDER CODE : TDA4601
DESCRIPTION
The TDA4601 is a monolithic integrated circuit
desi-gned to regulate and control the switching
transistor in a switching power supply.
Because of its wide operational range and high
vol-tage stability even at high load changes, this IC
can be used not only in TV receivers and video
recorders but also in power supplies in Hi-Fi sets
and active speakers.
DIP 9+9
(Plastic Package)
ORDER CODE : TDA4601B
PIN CONNECTIONS
9
8
7
6
5
4
3
2
1
September 1993
DIP 9+9
VIN
PULSE OUTPUT
DC OUTPUT
GROUND
EXTERNAL FUNCTION
IC SIMULATION
INPUT CONTROL
ZERO CROSSING
VREF
VREF
1
18
GROUND
ZERO CROSSING
2
17
GROUND
INPUT CONTROL
3
16
GROUND
I C SIMULATION
4
15
GROUND
EXTERNAL FUNCTION
5
14
GROUND
GROUND
6
13
GROUND
DC OUTPUT
7
12
GROUND
PULSE OUTPUT
8
11
GROUND
V IN
9
10
GROUND
1/8
4601-01.EPS - 4601-02.EPS
SIP9
TDA4601
BLOCK DIAGRAM
BASE
CURRENT
AMPLIFIER
CONTROL
AMPLIFIER
STANDBY
OPERATION
TRIGGER
START
HOLD
VOLTAGE
CONTROL
OVERLOAD
IDENTIFICATION
CONTROL
LOGIC
REFERENCE
VOLTAGE
ZERO PASSAGE
IDENTIFICATION
1
2
COUPLING -CCHARGING
CIRCUIT
BASE
CURRENT
SWITCH-OFF
COLLECTOR
CURRENT
SIMULATION
EXTERNAL
BLOCKING
FUNCTION
4
5
3
6
4601-03.EPS
START-UP
CIRCUIT
8
7
9
10 to 18
Symbol
V9
V1
V2
V3
V4, V5
V7, V8
I2, I3
I4
I5
I7
I8
Toper
Tstg
Tj
Parameter
Supply Voltage
Reference Output
Identification Input
Controlled Amplifier
Operating Ambient Temperature
Storage Temperature
Junction Temperature
Value
20
6
– 0.6, 0.6
3
8
V9
– 3, 3
5
5
1.5
– 1.5
0, 85
– 40, 150
– 40, 125
Unit
V
V
V
V
V
Value
15
70
Unit
°C/W
°C/W
mA
mA
mA
A
A
°C
°C
°C
4601-01.TBL
ABSOLUTE MAXIMUM RATINGS
Symbol
R th (j–c)
Rth (j–a)
Parameter
Thermal Resistance Junction-pins
Thermal Resistance Junction–ambient
Max.
Max.
4601-02.TBL
THERMAL DATA
ELECTRICAL CHARACTERISTICS (Tamb = 25oC)
Symbol
Parameter
V9
Operating Supply Voltage Range
Test Conditions
Min.
7.8
Typ. Max.
18
Unit
V
0.5
2.0
3.2
12.3
mA
mA
mA
V
I9
V9
2/8
Supply Current (V 1 not yet switched on)
Switch Threshold (V 1)
V9 = 2 V
V9 = 5 V
V9 = 10 V
11
1.5
2.4
11.8
4601-03.TBL
START CONDITION (according to test circuit of fig. 1)
TDA4601
ELECTRICAL CHARACTERISTICS (Tamb = 25oC ) (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)
Supply Current
I9
Vref
Voltage Reference at Pin 1
V3
V4
∆V4
V5
V7
V8
∆V8
V2
TK1
Control Voltage
Collector Current Simulation Voltage
Collector Current Simulation Voltage
External Protection Threshold
Pin 7 Output Voltage
Pin 8 output Voltage
Pin 8 Output Voltage Change
Feedback Voltage
Reference Voltage Temperature Coefficient
Vcont = – 10V
Vcont = 0V
I1 < 0.1mA
I1 = 5mA
Vcont = 0V
Vcont = 0V, see note 1
Vcont = 0V to –10V, see note 1
Vcont = 0V, see note 1
Vcont = 0V, see note 1
Vcont = 0V to –10V, see note 1
see note 1
110
50
4
4
2.3
1.8
0.3
6
2.7
2.7
1.6
135
75
4.2
4.2
2.6
2.2
0.4
7
3.3
3.4
2
0.2
10–3
160
100
4.5
4.4
2.9
2.5
0.5
8
4.0
4.0
2.4
mA
mA
V
V
V
V
V
V
V
V
V
V
1/oK
22
1.5
2.1
V1
2
7.4
0.6
28
1.8
2.5
mA
V
V
V
7.8
1
V
V
450
0.5
1
30
ms
V
V
V
kHz
VA
PROTECTION OPERATION (V9 = 10V ; Vcont = – 10V ; Vclock = ± 0.5V ; f = 20kHz ; duty cycle 1 : 2)
I9
V7
V4
V5
V9
∆V9
Supply Current
Switch–off Voltage
Switch-off Voltage
Blocking Voltage
V5 ≤ 1.8 V
V5 ≤ 1.8 V
V5 ≤ 1.8 V
Vcont = 0 V
Supply Voltage for V8 Blocked
Supply Voltage for V1 off While Further
Decreasing V9
Vcont = 0 V
14
1.3
1.8
V1
− 0.1
2
6.7
0.3
ton
∆V2
Secondary Voltage Switching Time
Voltage Variation with Load
∆V2
f
PP
Stand by Condition
Stand by Frequency
Primary Power Consumption in Stand by
Condition
S3 Closed, P3 = 20 W
S2 Closed, P2 = 15 W
S1 Open Ploa d = 3 W
70
350
0.1
0.5
20
75
10
12
4601-04.TBL
ELECTRICAL CHARACTERISTICS (according to test circuit of fig. 2)
Note 1 : Only DC component
Figure 1 : Test Circuit
Test Diagram : Overload Operation
V
18
17
16
15
14
13
12
11
V
10
0.5
0
0.5
2
3
4
5
6
7
8
V4
9
Vcont
V R = -10V
VR = 0
1
10µF
0
V8
t
8
27Ω
10µF
6
V9
4
4601-04.EPS
VREF I 1 V
t
3
2
100kΩ
D8 1N4003
10kΩ
1µF
100kΩ
10nF
22pF
20kΩ
1kΩ
2.2kΩ
0.68Ω
60 70 80
2
0
4601-05.EPS
1
10 20 30 40
t
3/8
TDA4601
Figure 2 : Test and Application Circuit
220VAC
4.7nF
4.7nF
B250/
C1000
18
17
16
15
14
13
12
11
10
2.7Ω
TDA4601
1N4007
C2540
1
220µF (3)
2
3
4
5
6
7
8
9
0.68Ω
200Ω
MAINS SEPARATION
100µF
100
kΩ
22pF
1.2kΩ
10kΩ / 3W
100µF / 25V
6V
10
kΩ
12
kΩ
10nF (1)
270kΩ
1N4007
100µF / 16V
4.7µH
10kΩ (2)
27Ω
1µF / 35V
BY258-200
8.2nF
BY295-450
BU508
100Ω
22nF
9
7
15
16
11
6
12
470µF
470µF
BY258
270pF
-600
470µF
100Ω
AZV
2
61-IC
BY258
-600
470µF
25V
18V
1
4
BY258
270pF
-600
BY258
270pF
-600
270pF
13
150V
S1
56kΩ
200V
S1
56kΩ
S1
470 Ω
120Ω
S1
33Ω
S3
V4
S2
V3
(1) C limits the max. collector current of BU508 at overshooting the permissible output power.
(2) Adjustement of secondary voltage.
(3) Must be discharged before IC change.
4/8
V2
V1
4601-06.EPS
56kΩ
6.8k Ω
1.5kΩ
TDA4601
CIRCUIT DESCRIPTION
The TDA 4601 regulates, controls, and protects the
switching transistor in reverse converter power
supplies at starting, normal, and overload operation.
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 capacitor and
the switching transistor. Up to a supply voltage
of V9 ≈ 12V, the current I9 is less than 3.2mA.
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 overload protected current supply.
3. Release of control logic. As soon as the
reference voltage is available, the control logic
is switched on through an additional stabilization
circuit. Thus, the IC is ready for operation.
This start-up sequence is necessary to guarantee
the supply through the coupling electrolytic capacitor to the switching transistor. Correct switching of
the transistor is only guaranteed in this way.
Normal Operation
Zero crossing of the feedback coil is registered at
pin 2 and passed to the control logic.
At pin 3 (regulation of input, overload, and standby
recognition)the rectified amplitude variations of the
feedback coil are applied. The regulating amplifier
works with an input voltage of about 2V and a
current of about 1.4 mA.
Together with the collector current simulation pin 4,
the overload recognition defines the operating region 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 voltages. 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, which may vary up to a maximum amplitude of 4V (ref. voltage).
A reduction of the secondary load down to 20 watts
causes the switching frequency to rise to about
50kHz at an almost constant pulse duty factor
(period to on-time approx. 3). A further reduction of
the secondary load down to about 1 watt results in
changing the switching frequency to approx.
70kHz, and additionally the pulse duty factor rises
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 collector current simulation are compared and instructions are given to the control logic. There is an
additional triggering and blocking possibility by
means of pin 5. The output at pin 8 is blocked at a
voltage of less than 2.2V at pin 5.
Depending on the start-up circuit, the zero crossing
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 V4 to pin 8. A current
feed-back having an external resistance of R =
0.68Ω is inserted between pin 8 and pin 7. The
resistance value determines the maximum amplitude of the base driving current for the switching
transistor.
Protective Measures
The base current shut-down, released by the control logic, clamps the output of pin 7 at 1.6V and
thus blocks driving 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 case of a short
circuit of the secondary windings of the P.S.U., the
IC continuouslymonitors the fault condition.
With the load completely removed from the secondary 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
operating conditions. After having blocked the output, causedat a supply voltage ≤ typ. 7.4V, a further
voltage reduction with ∆V9 = 0.6V results in switching off the reference voltage (4V).
5/8
TDA4601
Figure 3 :
Frequency versus Output Power
(Test Circuit of Figure 2)
Figure 4 :
f (kHz)
80
100
Efficiency versus Output Power
(Test Circuit of Figure 2)
η (%)
80
60
60
40
40
20
20
Figure 5 :
160
120
40
60
80
100
120
Load Characteristics V2-f (Iq2)
(Test Circuit of Figure 2)
PO (W)
0
20
Figure 6 :
40
60
80
100
120
4601-08.EPS
0
4601-07.EPS
20
P O (W)
Output Voltage V2 (mains change)
(Test Circuit of Figure 2)
VO2 (V)
VO2 (V)
151
150
V mains = 180V
V mains = 220V
149
V mains = 250V
40
I O2 (mA)
0
200
400
600
800
1000
1200
4601-09.EPS
148
Figure 7 : Example of a PC Heatsink (35°C/W)
l
6/8
4601-11.EPS
COPPER AREA
35µ THICKNESS
Vmains (V)
147
150
170
190
210
230
250
270
4601-10.EPS
80
TDA4601
PACKAGE MECHANICAL DATA
9 PINS - PLASTIC SIP
C
L3
D
L1
c2
d1
N
1
9
L
a1
L2
A
M
b1
e
c1
e3
PM-SIP9.EPS
b3
B
A
a1
B
b1
b3
C
c1
c2
D
d1
e
e3
L
L1
L2
L3
M
N
Min.
Millimeters
Typ.
2.7
Max.
7.1
3
24.8
Min.
0.106
0.5
0.85
Inches
Typ.
Max.
0.280
0.118
0.976
0.020
1.6
0.033
3.3
0.43
1.32
0.063
0.130
0.017
0.052
21.2
0.835
14.5
2.54
20.32
0.571
0.100
0.800
3.1
0.122
3
17.6
0.118
0.693
0.25
3.2
1
0.010
0.126
0.039
SIP9.TBL
Dimensions
7/8
TDA4601
I
b1
L
a1
PACKAGE MECHANICAL DATA
18 PINS - PLASTIC POWERDIP
b
B
e
E
Z
Z
e3
D
10
1
9
a1
B
b
b1
D
E
e
e3
F
i
L
Z
Min.
0.51
0.85
Millimeters
Typ.
Max.
1.4
Min.
0.020
0.033
0.5
0.38
Inches
Typ.
Max.
0.055
0.020
0.5
24.8
0.015
8.8
2.54
20.32
0.020
0.976
0.346
0.100
0.800
7.1
5.1
3.3
0.280
0.201
0.130
2.54
0.100
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information 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 otherwise under any patent 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 components in 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 use these components in a I2C system, is granted provided that the system conforms to
the I2C Standard Specifications as defined by Philips.
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8/8
DIP18PW.TBL
Dimensions
PMDIP18W.EPS
F
18