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© 2022 ROHM Co., Ltd.
65UG028E Rev.001
2022.7
User's Guide
BD7F105EFJ-EVK-001
Figure 3. Circuit diagram
Application circuit
The evaluation board operates with an average frequency of approximately 363 kHz.
Monitoring the flyback voltage due to the voltage at the output provides primary-side feedback control that eliminates the
need for photocouplers and auxiliary windings.
Operation starts when the VIN pin voltage exceeds UVLO detect voltage of 3.4 V (Typ) and SDXEN pin Enable pin voltage of
2.0 V (Typ).
The circuit diagram of the demonstration board is shown in the figure below, and the parts list is shown on page 12.
