Add fast OVP circuit by monitoring Vclamp voltage on the primary side to avoid output voltage rise above max. value in case of failure in tracker circuit or if control signal (U_MON) rise above 2.5 V. Reuse a half of LM258 (IC4) currently used for NTC signal buffering and add voltage divider on FB (e.g. 750R + 130K).
prasimix
commented
6 years ago
Add fast OVP circuit by monitoring Vclamp voltage on the primary side to avoid output voltage rise above max. value in case of failure in tracker circuit or if control signal (U_MON) rise above 2.5 V. Reuse a half of LM258 (IC4) currently used for NTC signal buffering and add voltage divider on FB (e.g. 750R + 130K).