TDA16847(2000) Ver la hoja de datos (PDF) - Infineon Technologies

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componentes Descripción

Fabricante

TDA16847
(Rev.:2000)

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

Infineon Technologies 

TDA 16846

TDA 16847

4

Temporary High Power Circuit FC2, PMO, REF

(Pin 6, 8, 9, TDA 16847)

Figure 14 shows the Temporary High Power Circuit:

Discharge Time

Internal

VCC

External

CS2

9 REF

I8

8 PMO

R9

51 kΩ

R8

S2

C8

C6

to Error Flipflop

1

+

6 FC2

-

FC2

1.2 V

R6

10 MΩ

AEB02739

Figure 14

The Temporary High Power Circuit (THPC) consists of two parts:

First a power measurement circuit is implemented: The capacitor C8 at Pin 8 is charged

with a constant current I8 during the discharge time of the flyback transformer and

connected to ground the other time. So the average of the sawtooth voltage V8 at Pin 8

is proportional to the converters output power (at constant output voltages). The charge

current I8 for C8 is dimensioned by the resistor R9 at Pin 9:

I8 = 5 V/R9

Data Sheet

17

2000-01-14

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