Transient threat, electrostatic discharge (ESD), for example, could jeopardise double switching power supply, the operation of the digital audio or analog video port. Therefore, at the time of the low speed interface circuit design, the start to join the transient voltage suppression is very important. Here is how to protect such interface (and power) from the effects of transient voltage peak.

Digital audio port
Fast transient surge and ESD shock can damage the audio codec's internal components. TVS diode (ESD protection diode) can solve this problem. This device can be safely inhibit 40 A fast transient threats and up to + / - 15 kV ESD impact. It can also be below 1 ns for energy surge respond quickly.

Video port
ESD and other transient impact will affect the reliability of the video port. To protect video adc from transient damage, you can add a 4 channel TVS diode array circuit chip. Low leakage current component can be safely stop up to 40 A electrical transient into the circuit.

Keyboard port
Used in telecommunications, security access, display control, and other consumer or keyboard circuits are susceptible to ESD impact of industrial applications. Designers can use multilayer varistor (MLV) to prevent any such transient peak during activation into the keyboard circuit. MLV can inhibit the peak of the energy is as high as 2.5 J transient current and up to 500 A. This multifunctional protection component has wide working temperature range (to 40 ° C to 125 ° C).

The battery pack control port
For the battery protection, you can use the fast fuse fuse to protect the controller IC from flow influence. The circuit also easily affected by transient voltage spike, the TVS diode array can be used to suppress.

The power supply circuit
The fuse is applicable to protect the ac power of fuse from the effects of potentially damaging current pulse. In order to protect the circuit from the effects of voltage peak, you can add a Littelfuse MOV (metal oxide varistor). Vitreous blowing the fuse is suitable for the protection of AC - DC power supply.

Dc power supply
For the 12 v or 24 v dc power supply protection, please consider using the MOV or TVS diode. This will protect the circuit from the effects of voltage peak. If you are designed for 48 VDC or higher power transient protection, please use the gas discharge tube TVS diode and grounding line. To optimize the double port or other low speed switch power supply reliability of the interface, please make sure to join in the circuit transient protection.