LT3420 as HV power supply. 

I need a HV (250-300V) power supply to bias an avalanche photo-diode (current ~1 mA max).  The spec sheet of the LT3420 says it can be used as a supply but there are no details.  Is it possible to have it always charging?  And not have the charging block turn on and off.  Or should I try another IC?  (LT3750?)  Or something like figure 13 from here.

http://www.analog.com/media/en/technical-documentation/application-notes/AN118fb.pdf 

Thank you,

George  

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  • Hi Victor, thanks for the response.   I’ve mostly just started the design, so specs are a bit fluid at the moment.

    For the APD, I’ll need fairly low ripple… I’m thinking less than 100mV, but I’m not really sure.  I’ve been looking at a different flyback controller chip. The LTC3803.  That one looks more useful.  As far as the input voltage.  Yeah I don’t really like the max input to the LT3402 (and it’s kin) 24V might be a better input voltage.

    George

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  • Hi Victor, thanks for the response.   I’ve mostly just started the design, so specs are a bit fluid at the moment.

    For the APD, I’ll need fairly low ripple… I’m thinking less than 100mV, but I’m not really sure.  I’ve been looking at a different flyback controller chip. The LTC3803.  That one looks more useful.  As far as the input voltage.  Yeah I don’t really like the max input to the LT3402 (and it’s kin) 24V might be a better input voltage.

    George

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