TDA16846 Ver la hoja de datos (PDF) - Infineon Technologies

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Fabricante

TDA16846

Controller for Switch Mode Power Supplies Supporting Low Power Standby and Power Factor Correction

Infineon Technologies 

TDA 16846

TDA 16846-2

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 R31 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 C4 at Pin 4.

During start up C4 is charged with a current of approx. 2 µA (Soft Start). For primary

regulation C4 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

Data Sheet

13

2003-07-31

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