TDA16846(2000) データシートの表示（PDF） - Infineon Technologies

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TDA16846
(Rev.:2000)

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

Infineon Technologies 

TDA 16846

TDA 16847

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). Figure 10 shows

the voltage diagrams of the Error Amplifier circuit.

External

Internal

Error

TR

R31

C3

Amplifier

5V

RZI 3

+ Down

-

R32

C4

SRC 4

Figure 9 Error Amplifier

VReg

AES02654

VRef

V3

Down

V4

Figure 10 Regulation Pulse Diagram

Data Sheet

13

t

AED02655

2000-01-14

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