TDA16846G 查看數據表（PDF） - Infineon Technologies

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TDA16846G

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

Infineon Technologies 

TDA 16846

TDA 16846-2

Fixed Frequency and Synchronization Circuit SYN (Pin 7)

Figure 11 shows the Fixed Frequency and Synchronization Circuit. The circuit is

disabled when Pin 7 is not connected or connected to pin 9 (Vref, to avoid noise

sensitivity). With R7 and C7 at Pin 7 the circuit is working. C7 is charged fast with approx.

1 mA and discharged slowly by R7 (Figure 11). The power transistor is switched on at

beginning of the charge phase. The switching frequency is (charge time ignored)

:

f ≈ ----0---,--8-----

R7 × C7

When the oscillator circuit is working the Fold Back Point Correction is disabled (not

necessary in fixed frequency mode). “Switch on” is only possible when a “zero crossing”

has occurred at Pin 3, otherwise “switch-on” will be delayed (Figure 12).

Figure 11 Synchronization and Fixed Frequency Circuit

Data Sheet

14

2003-07-31

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