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TDA16846G 데이터시트(PDF) 14 Page - Infineon Technologies AG

부품명 TDA16846G
상세설명  ICs for Consumer Electronics
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제조업체  INFINEON [Infineon Technologies AG]
홈페이지  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

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TDA 16846
TDA 16847
Data Sheet
14
2000-01-14
Fixed Frequency and Synchronization Circuit SYN (Pin 7)
Figure 11 shows the Fixed Frequency and Synchronization Circuit. The circuit is
disabled when Pin 7 is not connected. With
R
7 and C7 at Pin 7 the circuit is working. C7
is charged fast by approx. 1 mA and discharged slowly by
R
7 (Figure 11). The power
transistor is switched on at beginning of the charge phase. The switching frequency is
(charge time ignored)
:
When the oscillator circuit is working the Fold Back Point Correction is disabled (not
necessary in fixed frequency mode). “Switch on” is only possible when a “zero crossing”
has occurred at Pin 3, otherwise “switch-on” will be delayed (Figure 12).
Figure 11
Synchronization and Fixed Frequency Circuit
f
1,18
R
7
C
7
×
--------------
AES02656
15 k
75 k
5 V
7
R
C7
SYN 7
Logic
OUT
RZI
13
3
Zero Crossing Signal
External
Internal
30
OP1OUT
OP1
k
LO


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