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AN4599 Fiches technique(PDF) 9 Page - STMicroelectronics

No de pièce AN4599
Description  This application note describes the features
PDF  26 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4599 Fiches technique(HTML) 9 Page - STMicroelectronics

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DocID026993 Rev 1
9/26
AN4599
Circuit description
26
Figure 4. Current sensing lossless capacitive current divider
2.6
Thermal protection
To render the application unbreakable, it was necessary to apply thermal protection near the
output diodes, the warmest area on the power (PWR) supply.
A thermal resistor NTC2 in partition with the R2 resistance is processed by a TSM103W,
used as comparator with high hysteresis.
When the output diodes reach 120 °C, the output of TSM103W drives Q3 to drain the
current from the optocoupler. The PWR supply shuts off and stays off as long as TSM103W
is supplied.



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