AnsweredAssumed Answered

LT8330

Question asked by K1MGY on Feb 23, 2018
Latest reply on Feb 23, 2018 by ARad

According to the constraints specified in the data sheet for the LT8330, the SEPIC inverting converter voltage output can be no greater than half that of the non-inverting boost converter.  At least, this is what I read considering the limits that can be used in the FBX voltage divider resistors.

I need to generate -48V (from +12 in) and it need not supply much current - it's used in an electrostatic application.  I've already configured a design for its opposite, a +48V boost, which fits into the FBX range without any worries.  

Oddly, the LT Spice model, using the standard values on the data sheet for a -24V converter, achieves only -14.5V.

Can the LT8330 be extended to -48V out by exceeding the FBX limits and achieve a reasonably stable voltage?  (+-0.1v is fine here, plus noise).  Or, are there better solutions?

Outcomes