SLVSH72 December 2023 TPS281C100
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
To pass the IEC61000-4-5 surge for TPS281C100, both input and output TVS diodes are needed to help absorb the surge energy. There are certain requirements on the input and output TVS diodes selection listed below.
Output TVS requirements:
Output TVS can serve two purposes: absorb the surge energy for the output surge, and help demagnetize the inductive energy during an inductive turn off. To ensure the output TVS clamps before the internal VDS clamp comes in during an output surge event, the clamping voltage the TVS needs to be selected so that VS + VTVS, CLMAP < VDS, Clamp, min. For standard 24V input system, SMBJ33CA is recommended at the output.
Input TVS requirements:
Input TVS needs to be selected so it doesn't interfere with normal operation. The reverse standoff voltage of the input TVS needs to be greater than the normal operation input voltage. The other requirement is that the input TVS needs to be equal or higher voltage rated than the output TVS, and it ensures that the surge energy is clamped by the output TVS instead of the input TVS when there is a output surge. For standard 24V input system, SMBJ36A is recommended at the input. Please note that a uni-directional TVS at the input is needed so the absolute minimum voltage of the device is not violated for negative input surge.