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1、Electrolytic Capacitor Ripple Current Derating Test Method and Life Time EvaluationFrom:郭雪松Date： Oct-27-04一.SPEC1.电解电容零件工程规格书中之Standard Rating表格，其中规定 了不同规格的电解电容Rated Ripple Current值，例如：Sharp机种 PWPC C904（滤波电容）67L215L-820-15N （CNN 公司 KXG Series）V VDCVCap.uFCase size争D*Lmmtan 8L.C.uARated RippleCurrent
2、mA rms/105C1min5min120Hz100KHz4508218*35.50.24157676371517852.此电容用于电源输入端滤波，因此采用120Hz时的Rated RippleCurrent 规格 715mA。3.而用于评估电解电容Ripple Current之Spec要依据以下公式：SPEC=Spec （component） X频率系数（FM） X温度系数（TM）注：FM/TM取值方法见附表4.OTPV 评估电解电容 Ripple Current 的 Derating 规格为 85%, 因此 测试值SPECX85% 时判定OK。二.Test Method将电解电容接地端吸
3、开串联一导线，直接用电流计探头测试该导线电流的有效值（rms），测试时要调整输入电压值（90V264V）达 到纹波电流最大。见图示：OIrms三.附表（FM&TM取值方法）：NCC公司产品为例l. Multiplying Factors on KMG Series (radial lead type)Frequency MultipliersRange50Hz120Hz300Hz1KHz10KHz100KHz3.3uF0.651.001.351.752.302.504.7uF 33uF0.751.001.251.501.751.8047uF 1000uF0.801.001.151.301.40
4、1.502200uF0.851.001.031.051.081.08Temperature MultipliersTemp (C)55657585105Multipliers2.232.2321.7312. Multiplying Factors on KY SeriesFrequency MultipliersRange120Hz1KHz10KHz100KHz180uF0.400.750.901.00220uF 560uF0.500.850.941.00680uF 1800uF0.600.870.951.002200uF0.750.900.951.003900uF4700uF0.850.95
5、0.981.00Temperature MultipliersTemp (C)55657585105Multipliers2.232.2321.7313. Multiplying Factors on KXG SeriesFrequency MultipliersRange120Hz1KHz10KHz100KHz100uF1.001.752.252.5120uF1.001.671.752.25Temperature MultipliersTemp (C)55657585105Multipliers2.232.2321.731Temperature multipliers shows the g
6、uide limits of the maximum available ripple current at each of the temperature,of which the life time at the rated maximum operating temperature is expected.四.电解电容寿命评估测试方法1. Calculation Formula:电容寿命 Life Time= Life(spec) X 2(Ts-Tt)/ioLife(spec):指spec中标明的寿命值Ts：电容最高使用温度值 Tt：电容本体温度测试值2. 判定方法：以上计算得出之寿命值与整机MTBF目标值比较， 若大于目标值则判定OK。3. 例如:SHARP 机种 C904 Life (spec) =10000Hrs, Ts=105C,Tt=52.6C,。SHARP MTBF 目标 50000Hrs。Life Time= 10000 X 2(io5-52.6)/io=377917Hrs5OOOOHrsOK
