The DC working voltage of the whole machine is 12V, the maximum allowable safety voltage is 25V (peak), the impedance of the surge source is 50MΩ, and the interference waveform is square wave, TP=1MS, and the maximum peak current is 50A.
Select: 1. First select the maximum reverse working voltage VRWM from the working voltage 12V to 13V, then the breakdown voltage V(BR)==15.3V; 2. Select the maximum clamping voltage VC(MAX)=1.30 from the breakdown voltage value. ×V(BR)=19.89V, take VC=20V; 3. Calculate the square wave pulse power from the clamp voltage VC and the peak current IP: PPR=VC×IP=20×50=1000W4, calculate the conversion to TP=1MS exponential wave peak power, the factor K1=1.4, PPR=1000W÷1.4=715W can be found in the manual 1N6147A where PPR=1500W, displacement voltage VRWM=12.2V, breakdown voltage V(BR)= 15.2V, the maximum clamp voltage VC = 22.3V, the maximum surge current IP = 67.3A. Can meet the above design requirements, and leave a margin, regardless of square wave or exponential wave.
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