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GPS接口浪涌靜電保護方案設計圖及防護器件選型詳解

從(cong)東沃(wo)GPS接(jie)口浪(lang)涌(yong)靜(jing)電(dian)(dian)(dian)(dian)(dian)(dian)保護方(fang)案設計圖可(ke)知(zhi)，東沃(wo)電(dian)(dian)(dian)(dian)(dian)(dian)子(zi)技(ji)術從(cong)兩個方(fang)面進行浪(lang)涌(yong)靜(jing)電(dian)(dian)(dian)(dian)(dian)(dian)防(fang)(fang)護：一(yi)個是對內饋直流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)進行浪(lang)涌(yong)防(fang)(fang)護，另一(yi)個是對射頻信(xin)號進行防(fang)(fang)護。一(yi)級電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)防(fang)(fang)護，東沃(wo)技(ji)術推薦選用(yong)半(ban)導體放電(dian)(dian)(dian)(dian)(dian)(dian)管P0080SC，用(yong)于吸收雷擊或大浪(lang)涌(yong)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)。饋電(dian)(dian)(dian)(dian)(dian)(dian)部分(fen)防(fang)(fang)護選用(yong)單向瞬態抑制TVS二極(ji)管SMBJ6.0A和肖特(te)基二極(ji)管B0520W，可(ke)有效保護后端LDO芯片免受浪(lang)涌(yong)的沖擊。二級信(xin)號接(jie)口選用(yong)東沃(wo)推出的ESD靜(jing)電(dian)(dian)(dian)(dian)(dian)(dian)保護二極(ji)管DW05DLC-B-S，工作電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)5V、低(di)鉗位電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)18.3V、低(di)漏電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)1uA。

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