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TDA16846 Datasheet(PDF) 13 Page - Infineon Technologies AG |
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TDA16846 Datasheet(HTML) 13 Page - Infineon Technologies AG |
13 / 28 page 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 Down |
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