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參數(shù)資料
| 型號(hào)： | TDA16847 |
| 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 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 351K |
| 代理商： | TDA16847 |
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TDA 16846
TDA 16847
Data Sheet
8
2000-01-14
2
Functional Description
Start Up Behaviour (Pin 14)
When power is applied to the chip and the voltage
V
14
at Pin 14 (
V
CC
) is less than the
upper threshold (
V
ON
) of the Supply Voltage Comparator (SVC), input current
I
14
will be
less than 100
μ
A. The chip is not active and driver output (Pin 13) and control output
(Pin 4) will be actively held low. When
V
14
exceeds the upper SVC threshold (
V
ON
) the
chip starts working and
I
14
increases. When
V
14
falls below the lower SVC threshold
(
V
OFF
) the chip starts again at his initial condition.
Figure 4
shows the start-up circuit and
Figure 5
shows the voltage
V
14
during start up. Charging of
C
14
is done by resistor
R
2
of
the “Primary Current Simulation” (see later) and the internal diode D1, so no additional
start up resistor is needed. The capacitor
C
14
delivers the supply current until the
auxiliary winding of the transformer supplies the chip with current through the external
diode D14.
It is recommended to switch a small RF snubber capacitor of e.g. 100 nF parallel to the
electrolytic capacitor at pin 14 as shown in the application circuits in Figures 15, 16, and
17.
Figure 4
Startup Circuit
AES02649
SVC
TDA 16846
D1
2
14
CC
V
PCS
2
C
R
2
C
14
C
p
Out
V
TR
D14
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