In the design of surge electrostatic protection scheme, the most important link is to understand and analyze the path of inrush current, and only after understanding the path of inrush current can we better build a reasonable discharge path for inrush current. Some time ago, a customer asked Dongwo Electronics for help: when the GPS interface of the company's monitoring wireless equipment was tested in the common mode 3ka@8 20 S 5T, the LDO chip was damaged and could not work normally, how to solve it? In response to the customer's situation, Dongwo Electronic Technology has designed a GPS interface surge electrostatic protection scheme diagram to escort the safety of the customer's circuit.
Design diagram of GPS interface surge electrostatic protection scheme
Detailed explanation of the GPS interface surge electrostatic protection scheme
It can be seen from the design diagram of the surge electrostatic protection scheme of Dongwo GPS interface that Dongwo electronic technology carries out surge electrostatic protection from two aspects: one is surge protection for the feeded DC power supply, and the other is for RF signal protection. For first-level power protection, Dongwo Technology recommends the semiconductor discharge tube P0080SC to absorb lightning strikes or large surge currents. Unidirectional transient suppression TVS diode SMBJ6 is used for the protection of the feed part0A and Schottky diode B0520W, which effectively protect the back-end LDO chip from surges. The secondary signal interface uses the ESD electrostatic protection diode DW05DLC-B-S launched by Dongwo, with a working voltage of 5V and a low clamping voltage of 183V, low leakage current 1UA. It can be used to provide ESD protection up to 30kV (air discharge) and 30kV (contact discharge) according to IEC 61000-4-2, and can withstand peak pulse currents of 17A (8 20us) according to IEC 61000-4-5, and the interface chip provides reliable electrostatic and surge protection. The ESD diode DW05DLC-B-S junction capacitor is 1pf, which can ensure the integrity of RF signal transmission.
GPS interface surge electrostatic protection device parameters
1) Semiconductor discharge tube P0080SC parameters.
Check the "TSS-Pxxxxsc Series Datasheet" of Dongwo Electronics
2) Transient TVS diode SMBJ60a parameter.
Check the "TVS-SMBJ Series Datasheet" of Dongwo Electronics
3) Schottky diode B0520W parameters.
Check the "SBD-B0520W THRU B0540W (SOD-123) Datasheet" of Dongwo Electronics
4) ESD diode DW05DLC-B-S parameters.
Check the "ESD-DW05DLC-B-S Datasheet" of Dongwo Electronics
The above is the design diagram of Dongwo GPS interface surge electrostatic protection scheme, if you have special needs, please come to **. Surge electrostatic protection program, find Dongwo Electronics, circuit protection do not get lost! The semiconductor discharge tube P0080SC and the transient TVS diode SMBJ6 selected in the scheme are selected0A, Schottky diode B0520W, ESD diode DW05DLC-B-S, Dongwo Electronics has been fully mass-produced, stable quality, high reliability, fast delivery, manufacturer**, free sample, free EMC test, free selection!