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TPS40210, HV boost, Variable ?

D. Johnson
Intellectual 700 points
Other Parts Discussed in Thread: TPS40210

I have a customer that is interested in using the TPS40210 for a HV boost supply.  This will be a very low current output, 1-2mA, flyback topology (I believe) , Vout range of 150 to 350 VDC.  Vin nominal is in the 30V range.  A control to vary the output voltage (from 150 to 350) is desired/required, could be a DAC or even PWM drive.  They would like to stay with this controller because it does not have an internal thermal shutdown (a requirement).  They may ultimately target the –HT version of this device. 

 

Questions –

1) Is the flyback the best topology or would you suggest an alternative ?

2) Any suggestions on how to use this boost supply and have a variable control feature ?

 

Regards,

Dave Johnson

  • 0
    TI__Mastermind 35165 points

    Hi Dave,

    The flyback topology will be the simplest solution as it allows control over the operating duty cycle using the turns ratio of the transformer. This will allow them to avoid operating near the max duty cycle of the IC. For variable control the DAC is typically used to inject extra current through a series resistor into the bottom feedback resistor to vary the output voltage. By injecting current into the bottom feedback resistor the operating output voltage will decrease.

    Do you have a couple more details you can share on what this HV boost supply is needed to power?

    Best Regards,
    Anthony

  • 0 in reply to Anthony F
    Intellectual 700 points

    Anthony - please contact me directly for additional details

    Dave 

    dave.johnson@avnet.com