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TDA16846 Datasheet(PDF) 13 Page - Infineon Technologies AG

Part # TDA16846
Description  ICs for Consumer Electronics
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TDA16846 Datasheet(HTML) 13 Page - Infineon Technologies AG

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TDA 16846
TDA 16847
Data Sheet
13
2000-01-14
Error Amplifier EA / Soft-Start (Pin 3, Pin 4)
Figure 9 shows the simplified Error Amplifier circuit. The positive input of the Error
Amplifier (EA) is the reference voltage 5 V. The negative input is the pulsed output
voltage from the auxiliary winding, divided by
R
31
and
R
32.
The capacitor
C
3 is
dimensioned only for delaying zero crossings and smoothing the first spike after switch-
off. Smoothing of the regulation voltage is done with the soft start capacitor
C
4 at Pin 4.
During start up
C
4 is charged with a current of approx. 2 µA (Soft Start). Figure 10 shows
the voltage diagrams of the Error Amplifier circuit.
Figure 9
Error Amplifier
Figure 10
Regulation Pulse Diagram
AES02654
-
+
Amplifier
5 V
Down
3
4
Reg
V
TR
4
C
3
C
Internal
External
31
R
32
R
RZI
SRC
Error
AED02655
t
Ref
V
3
V
V4
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