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AN3290 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN3290
Description  Reference design for double output SMPS for power line
PDF  34 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3290 Datasheet(HTML) 22 Page - STMicroelectronics

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Protection features
AN3290
22/34
Doc ID 18038 Rev 1
5.2
Auxiliary winding disconnection (brownout)
At any switching cycle, the current sourced from the ZCD pin during turn-on is sensed and
compared with an internal reference, IZCDON (50 µA).
When the auxiliary winding is accidentally disconnected, no more current is sourced from
the pin and the IC enters brownout, therefore, immediately stopping switching. After restart,
once VCC reaches the VCCon threshold, the device restarts again and, if the fault is still
present, the protection is maintained active.
This feature has been tested and the results are shown in Figure 24.
Figure 24.
Brownout protection activation



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