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Old 28th December 2011, 10:52 AM   #2231
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Default Old SMHV shunt regulator

I'm doing in a quanghao board the old SMHV, it uses irf9610 for CCS, MJE350 and irf8410.

Vin is 285VDC and I only get 0Vout, LED's are all ligthning so I think IRF9610 is OK but I don't know how I have to start to fix the issue.

Thanks for help
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Old 28th December 2011, 11:05 AM   #2232
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Check vgs on both mosfets. Should be ~4V. Also check the Jfet.
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Old 28th December 2011, 11:33 AM   #2233
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IRF9610 9.3V
IRF840 3.5V
2SK170BL 0.59V
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Old 28th December 2011, 11:57 AM   #2234
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Are you sure its 9.3V for 9610 between G & S (outer pins)?
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Old 28th December 2011, 12:04 PM   #2235
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Now 9.5V, see pic
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Old 28th December 2011, 12:16 PM   #2236
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Looks much. But maybe because you got very large Vin-Vout right now. Can be bust. Check all your orientations, check if the system draws any current, change the easy ones, like MJE, FET, first.
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Old 28th December 2011, 12:20 PM   #2237
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OK i will start with sk170, mje350 and let you know. Thanks for help Nick.

N.B. SK170BL I have 6.60-6.78 range and 8.16-8.98 range, wich range will be better?

Last edited by merlin el mago; 28th December 2011 at 12:24 PM.
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Old 28th December 2011, 12:25 PM   #2238
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Low range.
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Old 28th December 2011, 01:46 PM   #2239
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220R gate resistor IRF9610 fired
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Old 28th December 2011, 01:52 PM   #2240
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You got a problem there. Change the Mosfet, its gate resistor, keep you rectification smoothing capacitor near input.
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