TDA16846 datasheet(17/28 Pages) INFINEON

Nome de Peças	TDA16846

Descrição Electrónicos	ICs for Consumer Electronics

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Fabricante Electrônico	INFINEON [Infineon Technologies AG]

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TDA 16846

TDA 16847

Data Sheet

17

2000-01-14

4

Temporary High Power Circuit FC2, PMO, REF

(Pin 6, 8, 9, TDA 16847)

Figure 14 shows the Temporary High Power Circuit:

Figure 14

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

First a power measurement circuit is implemented: The capacitor

C

8 at Pin 8 is charged

with a constant current

I

8 during the discharge time of the flyback transformer and

connected to ground the other time. So the average of the sawtooth voltage

V

8 at Pin 8

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

current

I

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

I

8 =5 V/R9

-

+

1.2 V

1

6 FC2

REF

9

8

FC2

S2

to Error Flipflop

Discharge Time

CS2

CC

V

51 k

R9

Ω

8

C

C6

8

R

PMO

6

10 M

R

Ω

Internal

External

AEB02739

I8

Nº de peça semelhante - TDA16846

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	TDA16846	909Kb / 29P	Controller for Switch Mode Power Supplies Supporting Low Power Standby and Power Factor V2.0, 31 July 2003

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