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TDA16846 데이터시트(PDF) 18 Page - Infineon Technologies AG

부품명 TDA16846
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
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/C6 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 × LSecondary × 5V)/(VOUT
2
× C
8 × R9)
L
Secondary: The transformers secondary inductance
V
OUT: The converters output voltage
So the time constant of
R
9/C8 for a certain high power shutdown level PSD is:
R
9 × C8 ≈ (PSD × LSecondary × 4.2)/VOUT
2
The converters high power shutdown level can be dimensioned lower (by
R
9, C8) than
the current limit level (see “current limiting”). So because of the delay
R
8/C6, 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.


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