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PDF TDA4601 Data sheet ( Hoja de datos )
| Número de pieza | TDA4601 | |
| Descripción | SWITCH-MODE POWER SUPPLY CONTROLLER | |
| Fabricantes | SGS-THOMSON | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TDA4601 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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TDA4601
SWITCH-MODE POWER SUPPLY CONTROLLER
. LOW START-UP CURRENT
. DIRECT CONTROL OF SWITCHING TRAN-
SISTOR
. 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.
PIN CONNECTIONS
DIP 9+9
(Plastic Package)
ORDER CODE : TDA4601B
SIP9
9 VIN
8 PULSE OUTPUT
7 DC OUTPUT
6 GROUND
5 EXTERNAL FUNCTION
4 IC SIMULATION
3 INPUT CONTROL
2 ZERO CROSSING
1 VREF
DIP 9+9
VREF
ZERO CROSSING
INPUT CONTROL
IC SIMULATION
EXTERNAL FUNCTION
GROUND
DC OUTPUT
PULSE OUTPUT
V IN
1
2
3
4
5
6
7
8
9
18 GROUND
17 GROUND
16 GROUND
15 GROUND
14 GROUND
13 GROUND
12 GROUND
11 GROUND
10 GROUND
September 1993
1/8
1 page  
TDA4601
CIRCUIT DESCRIPTION
The TDA 4601 regulates, controls, and protects the
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 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 capaci-
tor 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 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, which may vary up to a maxi-
mum 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 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 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 ampli-
tude of the base driving current for the switching
transistor.
Protective Measures
The base current shut-down, released by the con-
trol 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 secon-
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
operating conditions. After having blocked the out-
put, causedat a supply voltage ≤ typ. 7.4V, a further
voltage reduction with ∆V9 = 0.6V results in switch-
ing off the reference voltage (4V).
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TDA4601.PDF ] | |
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