TEA2164 데이터 시트보기 (PDF) - STMicroelectronics

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TEA2164

SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT

STMicroelectronics 

TEA2164

Figure 10 : Repetitive Over-current Protection

III. SWITCHING OSCILLATOR AND SYNCHRONIZATION

III.1. Switching oscillator

When the TEA2164 control circuit operates in burst

mode, the switching frequency is fixed by the free

frequency oscillator. The period is determined by

two external components CO and RO.

III.2. Synchronization

oscillators are not synchonuous. In order to avoid

any erratic conduction of the power transistor, the

first synchronization pulse will arrive simultanously

with the sawtooth return of the TEA2164 oscillator.

To get synchronization the free frequency must be

higher than the synchronization frequency.

When the master-circuit starts to send pulses both

TO < Tsync. < 1.50 TO

Figure 11 : Free Frequency Running

Figure 12 : Synchronization Pulse Shaper and Synchronization

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