TEA2164 datasheet(10/15 Pages) STMICROELECTRONICS

Part #	TEA2164

Description	SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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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

When the master-circuit starts to send pulses both

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.

TO <Tsync. < 1.50 TO

Figure 11 : Free Frequency Running

Figure 12 : Synchronization Pulse Shaper and Synchronization

TEA2164

10/15

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