How can edge box power modules improve voltage drop immunity?

The edge computing box power module enhances voltage drop immunity primarily through input energy storage and fast recovery design.

Solution 1: Connect a large-capacity electrolytic capacitor in parallel at the DC-DC input. A 1000μF/50V low-ESR model is recommended, paired with a TVS 5.0SMDJ33CA (named 5.0SMDJ 5000W SMC package, 33V, rule B). The nominal breakdown voltage is 33V, and the actual VRWM is 28.2V, capable of absorbing surges and preventing reverse overvoltage during voltage drops.

Solution 2: Use a wide-voltage input power module supporting 9-36V wide voltage drops to 12V while maintaining stable output.

Solution 3: Add an undervoltage lockout circuit using a voltage detection chip to set an 8V threshold. Below the threshold, the output is shut down to prevent undervoltage operation of subsequent stages.

Solution 4: Input series common-mode inductor CML4532A-101T. This CML series 4532 inductor has dimensions of 4.5×3.2mm.

The 101T inductor with a 100μH capacity, combined with the input capacitor, forms an LC filter to smooth out drop spikes. Actual testing showed that with the addition of a 1000μF capacitor at the edge of the box, when the input voltage dropped to 18V for 100ms, the output voltage dropped to 5V with a recovery time of only 150mV and a recovery time of <2ms, fully meeting the IEC61000-4-29 Class A standard.