ZHCS531G September 2007 – January 2018 LM3103
PRODUCTION DATA.
The voltage at the FB pin is compared to a 0.68 V internal reference. If it rises above 0.68 V, the on-time is immediately terminated. This condition is known as over-voltage protection (OVP). It can occur if the input voltage or the output load changes suddenly. Once the OVP is activated, the main MOSFET remains off until the voltage at the FB pin falls below 0.6 V. The synchronous MOSFET will stay on to discharge the inductor until the inductor current reduces to zero and then switch off.