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전자부품 반도체 검색엔진( 무료 PDF 다운로드 ) - 데이터시트뱅크

TEA2164S 데이터 시트보기 (PDF) - STMicroelectronics

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TEA2164S
ST-Microelectronics
STMicroelectronics ST-Microelectronics
TEA2164S Datasheet PDF : 16 Pages
First Prev 11 12 13 14 15 16
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
9.1k
Sawtooth
Return
S
Q
TEA2164S
To Output
Flip-Flop
Reset
13.4k
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.
11/16

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