TEA2164 데이터 시트보기 (PDF) - STMicroelectronics

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TEA2164

SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT

STMicroelectronics 

TEA2164

output conduction signals are inhibited. The cir-

cuit will send base drives again after capacitor C1

discharge (Figure 7).

- Long duration overload protection : (Figure 8)

An overload is detected when the sense-voltage

on Pin 11 reaches VCM3 before a negative pulse

has been applied to Pin 6. In this case the capaci-

tor C2 (connected to Pin 3) is charged with I3 ch

up to the end of the period and discharged with I3

disch until a next VCM3 detector. By this way in

case of long duration overload, the capacitor

Figure 7 : Overvoltages Lock-out

keeps charging at each period and its voltage

encreases gradually. When the voltage on Pin 3

exceeds VC2, the TEA2164 control circuit stops

sending base drives and memorizes this event.

No restart is allowed as long as Vpin 3 is higher

than VC2 and VCC higher than 4.8V.

* Remark :

- The harder is the overload the faster is the pro-

tection

- The capacitor keeps charging between two burst

after VCM2 detection.

Figure 8 : Long Duration Overload Monitoring Circuit

Figure 9 : Long Duration Overload Detection

9/15

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