TEA2164S 查看數據表（PDF） - STMicroelectronics

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TEA2164S

SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT

STMicroelectronics 

III - SWITCHING OSCILLATOR AND SYNCHRONIZATION (continued)

Figure 13 : Synchronization Pulse Shaper and Synchronization

2 VD

6

MONO

R

Q

Pulse

Transformer

2 VD + 0.4V

MONO

OSCILLATOR SECTION

9.1kΩ

Sawtooth

Return

S

Q

TEA2164S

To Output

Flip-Flop

Reset

13.4kΩ

Q

VD ~ 0.65V

Figure 14 : Operation after Synchronization

1 - NORMAL OPERATION

Synchro

Pulse

V8

1.66V

∆T

2.66V

3.3V

0V

Synchro ”OFF”

Synchro

Pulse

2 - NEGATIVE PULSE MISSING

V8

1.66V

2.5V

3.3V

Base

Current

∆T : Synchronization Window

3 - ERRATIC POSITIVE PULSES

Synchro

Pulse

P1

P2

∆T

V8

1.66V

2.66V

0V

Base

Current

P1 and P2 are masked dur to the synchronization window.

Base

Current

Transistor turn-off is ensured by VCM1 current limitation cros-

sing or by an internal tON(Max.) limitation set by a 2.5V threshold.

Synchro

Pulse

4 - fsynchro < 0.65 fO

P1

3.3V

V8

1.66V

0V

S1

Base

Current

Signal S1 triggers burst oscillator capacitor discharge.

The TEA2164S restarts in burst mode.

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