TDA4718 查看數據表（PDF） - Infineon Technologies

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TDA4718

Control IC for single-ended and push-pull switching-mode power supplies

Infineon Technologies 

TDA 4700

TDA 4718

Dimensioning Notes for RC Network

1. Determination of the minimum time during which both outputs must be disabled

→ selection of CT; selection of CR ≤ CT.

2. Determination of the VCO frequency = 2 x output frequency

→ selection of RT.

3. Determination of the rated slope of the rising ramp generator voltage, which the

maximum possible turn-on period per half wave depends on

→ selection of RR.

4. Duration of the soft start process

→ selection of Csoft start.

5. In the case of a free-running VCO: connect sync output with sync input.

6. Wiring of the op amp according to the dynamic requirements and

connection of its output with the free input of K2. (TDA 4700; TDA 4700 A)

7. Capacitance Cfilter is not required in the free-running operation (sync input connected

with sync output).

In the case of external synchronization, that value depends on the selected operating

frequency and the required maximum phase interference deviation.

Rated VCO frequency:

Cfilter favourable:

100 kHz

10 nF

50 Hz

1µF

Semiconductor Group

17

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