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CX8812 5V3.1A測試板及重要元件選擇

官方彩票appJINTIANGEIDAJIAJIESHAOYIKUANCHENGXINWEI2016NIANZUIXINDEDC/DCCHECHONGIC

CX8812

TEDIAN

  •  工作電源8-32V(滿足目前大多數車充耐壓要求,大車24V,小車12V)
  •  輸出固定5V(針對目前市場上一些車充在上電瞬間輸出電壓會偏高導致一些車載產品損壞)
  •  工作頻率 135KHZ(工作頻率低EMC.EMI在更少的外圍電路的情況下更容易過)
  •  帶線損補償 CX8812固定線補0.3V,同線路CX8815 固定線補1.0V
  •  恒流精度+/-5%,恒壓精度+/-2%。(輸出更穩定,高精度使你的電子產品充電更穩定)
  •  短路保護(SCP),過熱保護(OTP),過壓保護(OVP)以及欠壓保護(UVLO)
  •  長期帶載電流3.1A(可以滿足目前大部分電子產品充電需求)
  •  高效率平均效率大雨90%以上(雖然是異步整流,但是效率不比同步整流差)
  •  輸出最大紋波≤100MV

CX8812CHECHONGFANGANSHURUDIANRONGXUANZE

官方彩票appZAILIANXUMOSHIZHONG,ZHUANHUANQIDESHURUDIANLIUSHIYIZUZHANKONGBIYUEWEIVOUT/VINDEFANGBO。WEILEFANGZHIDADESHUNTAIDIANYA,BIXUCAIYONGZHENDUIZUIDARMSDIANLIUYAOQIUERXUANZEDIESR(DENGXIAOCHUANLIANDIANZU)SHURUDIANRONG。ZUIDARMSDIANRONGDIANLIUYOUXIASHIGEICHU:

                                             

QIZHONG,ZUIDAPINGJUNSHUCHUDIANLIUIMAXDENGYUFENGZHIDIANLIUYU1/2FENGZHIWENBODIANLIUZHICHA,JIIMAX=ILIM-△IL/2。ZAIWEISHIYONGTAOCIDIANRONGSHI,HUANJIANYIZAISHUCHUDIANRONGSHANGZENGJIAYIGE0.1uf-1uf

官方彩票appDETAOCIDIANRONGQIYIJINXINGGAOPINQUOU。TONGCHANGSHURUDIANRONGXUANZE: 100UF/35V +/-20%DIANJIEDIANRONGBINGYIGE1UF/50VTIEPIANTAOCIDIANRONG。

CX8812CHECHONGFANGANSHUCHUDIANRONGXUANZE

   TONGYANGXUYAODIESRSHUCHUDIANRONGLAIBAOZHENGDISHUCHUDIANYAWENBO,SHUCHUDIANYAWENBOWEI:

              VRIPPLE=IOUT*KRIPPLE*RESR+VIN/28*FLX2*L*COUT

                                FLX2=FLX的平方

    ZHELIDEIoutmaxSHIZUIDASHUCHUDIANLIUKrippleSHIWENBOYINSHU,ResrSHISHUCHUDIANRONGDEDENGXIAOCHUANLIANDIANZU(ESR),FlxSHIKAIGUANPINLV,LSHIDIANGANLIANG,CoutSHISHUCHUDIANRONG。

JIASHESHUCHUSHIYONGTAOCIDIANRONG,ResrHENDIBUHUIYINGXIANGSHUCHUWENBO。YINCI,YONGTAOCIDIANRONGSHIKEYIYONGGENGDIDEDIANRONGZHI。JIASHESHIYONGTANDIANRONGHUODIANJIEDIANRONGSHI,NEIMEWENBOYOUResrHEWENBODEDIANLIUCHENGZHIJUEDING。RUGUOSHINEIYANGDEHUA,JIUYAOXUANZEDIESRDESHUCHUDIANRONGDUIYUTAOCISHUCHUDIANRONG,DIANXINGXUANZEYIGE470UFDEDIANRONG,DUIYUTANDIANRONGHUODIANJIEDIANRONG,XUANZEYIGEESRDIYU50MΩDEDIANRONG;TONGCHANGSHUCHUDIANRONGXUANZE: 470UF/10V  LOW ESR   DIANJIEDIANRONGZAIBINGYIGE0.1-1ufTAOCIDIANRONG。

官方彩票appCX8812CHECHONGFANGANDIANGANZILIAO

官方彩票app DIANGANWEISHUCHUFUZAIWEICHILIANXUDEDIANLIU,DIANGANDIANLIUWENBOYOUDIANGANLIANGJUEDING:

GENGDADIANGANLIANGNENGGOUJIANXIAODIANLIUWENBODEFENGFENGZHI。JIAODADEDIANGANLIANGHUIZENGJIADIANGANCIXINCHICUNHEBINGLIANDIANZU,QIEHUIJIANGDIDIANLIUCHULINENGLI,SUOYIYAOZAIDIANGANCIXINCHICUNHEBINGLIANDIANZUZHIJIANJINXINGZHEZHONG,TONGCHANGGENJUWENBODIANLIUDEXUYAOLAIXUANQUDIANGANZHIL:

                      L=VOUT*(VIN-VOUT)/VIN*FLX*IOUTMAX*KRIPPLE

ZAIZHELIVinSHISHURUDIANYA,VoutSHUSHUCHUDIANYA,FlxSHIKAIGUANPINLV,IoutmaxSHIZUIDASHUCHUDIANLIU,KrippleSHIWENBOYINSHU。ZAIDIANXINGYINGYONGZHONG,XUANZEKripple=30%

     有了電感量,電感峰值電流為Iout×(1+官方彩票appKripple/2)。要確保電感峰值電流低于轉換器的限流點。最后選擇合適磁芯尺寸以至于電感不會達到電感峰值電

    LIUSHIBAOHE。

le="font-family:Wingdings;mso-fareast-font-family:宋體;mso-bidi-font-family:宋體;color:rgb(0,0,0);font-size:10.5000pt;mso-font-kerning:0.0000pt;" >l 高效率平均效率大雨90%以上(雖然是異步整流,但是效率不比同步整流差)

官方彩票appSHUCHUZUIDAWENBO≤100MV


 RSEN =100MV/Iout*1.2

        QIZHONG:IOUT=SHUCHUDIANLIU, 1.2 SHIJIANGSHUCHUDIANLIUFANGDA1.2BEIBIMIANYINICHUODIANZUWUCHASHISHUCHUDABUDAOSHIJIXUYAO  ;   

官方彩票app100MVSHIIC  ISENCANKAODIANYA。




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