參數(shù)資料
型號(hào)： TDA16846G
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)： 18/28頁(yè)
文件大小： 351K
代理商： TDA16846G
TDA 16846
TDA 16847
Data Sheet
18
2000-01-14
Second a High Power Shutdown Comparator (FC2) is implemented: When the voltage
V
6
at Pin 6 exceeds 1.2 V the Error Flip Flop (ERR) is set. The output voltage of the
power measurement circuit (Pin 8) is smoothed by
R
8
/
C
6
and applied to the
“
high power
shutdown
”
input at Pin 6. The relation between this voltage
V
6
and the output power of
the converter
P
is approximately:
V
6
≈
(
P
×
L
Secondary
×
5 V)/(
V
OUT
2
×
C
8
×
R
9
)
L
Secondary
: The transformers secondary inductance
V
OUT
: The converters output voltage
So the time constant of
R
9
/
C
8
for a certain high power shutdown level
P
SD
is:
R
9
×
C
8
≈
(
P
SD
×
L
Secondary
×
4.2)/
V
OUT
2
The converters high power shutdown level can be dimensioned lower (by
R
9
,
C
8
) than
the current limit level (see
“
current limiting
”
). So because of the delay
R
8
/
C
6
, the
converter can deliver maximum output power (current limit level) for a certain time (e. g.
for power pulses like motor start current) and a power below the high power shutdown
level for unlimited time. This has the advantage that the thermal dimensioning of the
power devices is only needed for the lower power level. Once the voltage
V
6
exceeds
1.2 V there are no more charge or discharge actions at Pin 8. The voltage
V
6
remains
high due to the bias current out of HPC and the converter remains switched-off. Reset
can be done by either plug-off the supply from the mains or with a high value resistor
R
6
(
Figure 14
).
R
6
causes a reset every view seconds. When Pin 9 is not connected or gets
too less current the temporary high power circuit is disabled.
相關(guān)PDF資料
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