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TDA4605-3 Scheda tecnica(PDF) 6 Page - Siemens Semiconductor Group

Il numero della parte TDA4605-3
Spiegazioni elettronici  Control IC for Switched-Mode Power Supplies using MOS-Transistor
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Produttore elettronici  SIEMENS [Siemens Semiconductor Group]
Homepage  http://www.siemens.com/
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Semiconductor Group
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TDA 4605-3
Block Diagram
Pin 1
The regulating voltage forwarded to this pin is compared with a stable internal reference voltage
VR
in the regulating and overload amplifier. The output of this stage is fed to the stop comparator. If
the control voltage is rather small at pin 1 an additional current is added by means of current source
which is controlled according the level at pin 7. This additional current is virtually reducing the
control voltage present at pin 1.
Pin 2
A voltage proportional to the drain current of the switching transistor is generated there by the
external RC-combination in conjunction with the primary current transducer. The output of this
transducer is controlled by the logic and referenced to the internal stable voltage
V2B . If the voltage
V2 exceeds the output voltage of the regulations amplifier, the logic is reset by the stop comparator
and consequently the output of pin 5 is switched to low potential. Further inputs for the logic stage
are the output for the start impulse generator with the stable reference potential
VST and the
supply voltage motor.
Pin 3
The down divided primary voltage applied there stabilizes the overload point. In addition the logic is
disabled in the event of low voltage by comparison with the internal stable voltage
VV in the primary
voltage monitor block.
Pin 4
Ground
Pin 5
In the output stage the output signals produced by the logic are shifted to a level suitable for MOS-
power transistors.
Pin 6
From the supply voltage
V6 are derived a stable internal references VREF and the switching
threshold
V6A , V6E , V6 max and V6 min for the supply voltage monitor. All references values (VR ,
V2B , VST) are derived from VREF . If V6 > VVE , the VREF is switched on and switched off when V6 <
V 6A . In addition, the logic is released only for V6 min < V6 < V6 max .
Pin 7
The output of the overload amplifier is connected to pin 7. A load on this output causes a reduction
in maximal impulse duration. This function can be used to implement a soft start, when pin 7 is
connected to ground by a capacitor.


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