SNVSBW1B December 2021 – October 2023 LM63460-Q1
PRODUCTION DATA
Like AUTO mode operation, FPWM mode is selected as a factory option. FPWM applies by default during synchronization. In FPWM mode, the switching frequency is maintained constant while lightly loaded by allowing negative current to flow in the inductor. Negative current is limited to –3 A by a reverse current limit circuit.
Frequency reduction is still available in FPWM mode if the output voltage is high enough to command minimum on time even while lightly loaded, allowing good behavior during faults that involve the output being pulled up.