SLVSBC7E October 2013 – September 2018 LMZ31530
PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
For protection against load faults, the LMZ31530 incorporates cycle-by-cycle overcurrent limiting control. The inductor current is monitored during the OFF state and the controller maintains the OFF state during the period in that the inductor current is larger than the overcurrent trip level. In cycle-by-cycle mode, applying a load that exceeds the regulator's overcurrent threshold limits the output current and reduces the output voltage as shown in Figure 26. If the overcurrent condition remains and the output voltage drops below 70% of the set-point, the LMZ31530 shuts down. Following shutdown, the module periodically attempts to recover by initiating a soft-start power-up as shown in Figure 26. This is described as a hiccup mode of operation, whereby the module continues in a cycle of successive shutdown and power up until the load fault is removed. During this period, the average current flowing into the fault is significantly reduced which reduces power dissipation. Once the fault is removed, the module automatically recovers and returns to normal operation as shown in Figure 27.