MIL-STD-1275E surge stopper with input range 7-36V & output 36V.

Question

Hi, 
 I require a MIL-STD-1275E surge stopper with input range 7-36V & output 36V. This will be conencted into a MAX25240 to regulate final output to 12V 2-3A as it is very efficient. 
 My circuit needs to continually operate during input distortions. 
 Reviewed: 
 www.analog.com/.../high-voltage-surge-stoppers-ease-mil-std-1275d-compliance.html 
 DN534 
 These solutions similar to what I need for my power input section BUT: 
 1. I'd like to replace the Reverse Polarity diode D1 with the solution in LTC4366 datasheet Figure 8. Is this a workable change? 
 2. Operate 7-36V nominally 
 3. Output 36V maximum. - Can I simply adjust the FB resistors? 
 4. Should I be looking at the LTC7860 instead?

Ashapiro · Accepted Answer

PaulCarson said: 1. I'd like to replace the Reverse Polarity diode D1 with the solution in LTC4366 datasheet Figure 8. Is this a workable change? 
 Looking through the article, the purpose of D1 is to block a -250V spike for 1us on the input. The circuitry in figure 8 is for blocking reverse DC inputs. I don't think it would be effective at blocking transients. 
 PaulCarson said: 2. Operate 7-36V nominally 
 This is a problem. The min input voltage for the LTC4366 is 9V. At this voltage range, you don&rsquo;t need the LTC4366&rsquo;s floating topology. Substitute with a different linear surge stopper. 
 PaulCarson said: 3. Output 36V maximum. - Can I simply adjust the FB resistors? 
 Yes, that should do it. 
 PaulCarson said: 4. Should I be looking at the LTC7860 instead? 
 You'd move to the LTC7860 if the load current was large (~10A), which doesn't seem to be the case in your application. If you want ideal diode and surge stopper functionality in one IC, consider the LTC4364. 
 -Aaron)

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MIL-STD-1275E surge stopper with input range 7-36V & output 36V.

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