ZHCSHO5C December 2017 – March 2023 LMZM23601
PRODUCTION DATA
To prevent excessive heating and power consumption under sustained output short-circuit conditions, a hiccup mode operation is included in the control logic. If an over current condition is maintained on the output, the LMZM23601 device shuts off both power MOSFETs and waits for a hiccup interval, tW, of approximately 8 ms. After the wait period, the device restarts operation beginning with a soft-start time interval.
Figure 7-2 shows hiccup mode operation: The LMZM23601 attempts to restart periodically, following a hiccup wait interval. If the fault at the output is still present, another hiccup wait interval is initiated, followed by another restart attempt. This sequence continues until the output short circuit is removed. When the output short circuit is removed, the output ramps up during the next restart sequence.