參數(shù)資料
型號(hào)： TDA16847G
廠商： INFINEON TECHNOLOGIES AG
英文描述： ICs for Consumer Electronics
中文描述： 消費(fèi)電子集成電路
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 351K
代理商： TDA16847G
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
C
7
at Pin 7 the circuit is working.
C
7
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
R
7
C
7
×
--------------
≈
AES02656
-
+
15 k
75 k
5 V
7
R
C
7
SYN 7
Logic
LO
OUT
RZI
13
3
Zero Crossing Signal
External
Internal
30
k
OP1OUT
OP1
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