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TDA16847-2 데이터시트(Datasheet) 13 Page - Infineon Technologies AG

부품명 TDA16847-2
상세내용  Controller for Switch Mode Power Supplies Supporting Low Power Standby and Power Factor
PDF  29 Pages
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제조사  INFINEON [Infineon Technologies AG]
홈페이지  http://www.infineon.com
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 13 page
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TDA 16846/16846-2
TDA 16847/16847-2
2
Version 2.0
13
31 Jul 2003
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 R32. The capacitor C3 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). For primary
regulation
C
4 is charged and discharged with pulsed currents. Figure 10 shows the
voltage diagrams of the Error Amplifier circuit.
Figure 9
Error Amplifier
Figure 10
Regulation Pulse Diagram




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