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TEA2164S 数据表(PDF) 11 Page - STMicroelectronics

部件名 TEA2164S
功能描述  SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT
Download  16 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TEA2164S 数据表(HTML) 11 Page - STMicroelectronics

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III - SWITCHING OSCILLATOR AND SYNCHRONIZATION (continued)
6
MONO
MONO
Pulse
Transformer
2V
D
2V
D + 0.4V
R
S
Q
Q
13.4k
9.1k
Sawtooth
Return
OSCILLATOR SECTION
To Output
Flip-Flop
Reset
Synchro ”OFF”
V
D ~ 0.65V
Q
Figure 13 : Synchronization Pulse Shaper and Synchronization
1 - NORMAL OPERATION
2 - NEGATIVE PULSE MISSING
3 - ERRATIC POSITIVE PULSES
4 - f
synchro < 0.65 fO
Synchro
Pulse
V
8
Base
Current
0V
1.66V
2.66V
3.3V
∆T
Synchro
Pulse
V
8
Base
Current
1.66V
3.3V
2.5V
Synchro
Pulse
V
8
Base
Current
0V
0V
1.66V
1.66V
3.3V
∆T
2.66V
Synchro
Pulse
V
8
Base
Current
P2
P1
P1
S1
Signal S1 triggers burst oscillator capacitor discharge.
The TEA2164S restarts in burst mode.
P1 and P2 are masked dur to the synchronization window.
∆T : Synchronization Window
Transistor turn-off is ensured by V
CM1 current limitation cros-
sing or by an internal t
ON(Max.) limitation set by a 2.5V threshold.
Figure 14 : Operation after Synchronization
TEA2164S
11/16


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