TVS tube TPSMDJ28CA for vehicle HUD head-up display load dump protection

What is HUD? Head Up Display (HUD) is a device that uses the principle of optical reflection to project important driving data onto the front windshield, making it easier for drivers to see without having to lower their heads, which is safer. HUD was previously used mostly on aircraft and fighter jets, but is now also used in some high-end cars to reduce the frequency of drivers looking down at the instrument panel and the probability of accidents. The HUD head-up display equipped in the car is powered by the on-board battery. In order to prevent the transient voltage generated by the dumped load from affecting the back-end devices, circuit protection devices are required to protect the circuit.

For the load dump protection of HUD head-up display of automotive electronic products, the protection scheme designed by DOWOSEMI is shown below:

The automotive HUD head-up display is powered by a 12V vehicle battery. During the startup and battery switching process, a high transient voltage will be generated, so a TVS diode is needed to protect the power bus. As can be seen from the solution, Dongwo Electronic Technology recommends using a TVS transient suppression diode TPSMDJ28CA (silkscreen DFGA), SMC package, bidirectional, AEC Q101 qualified, working voltage 28V, breakdown voltage 31.1V, clamping voltage 45.4V, peak pulse current 66.08A, peak pulse power 3000W, and EFT protection in accordance with the IEC61000-4-4 standard, which fully meets the application requirements of conventional vehicle HUD head-up display load dump protection. The main electrical parameters of the automotive-grade TVS diode TPSMDJ28CA are shown in the figure below:

In summary, Dongwo Electronics TVS diode TPSMDJ28CA can pass the AEC-Q101 certification standard, has high reliability and stable quality, and is an excellent choice for the load dump protection circuit of the vehicle HUD head-up display.