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WEBENCH® Tools/TPS61170: TPS61170

Doug Hauck
Prodigy 90 points
Part Number: TPS61170

Tool/software: WEBENCH® Design Tools

I'm using Webench to develop a step-up converter with Vin = 4.8V to 16V; Vout = 16V @ 50mA.

I like the TPS61170 because it is a simple, small circuit.  When I tell Webench to create a circuit that has the same inputs as above, but with 100mA output, it recommends the TPS61170.  It shows efficiency curves output from <10mA to 100mA, which tells me it must be stable throughout that range of output current levels.

However when I tell Webench that my output is going to be only 50mA, it tells me "Design update failed. This design is not stable due phase margin either smaller than 35 or greater than 120."  I have downloaded the simulation into TINA, but I don't understand where to look at the phase margin.

I have read through slva319c.pdf but I don't have MathCad.  My question is: would it be advisable to use the circuit that Webench comes up with for 100mA output, even though I intend to use this circuit with a 25mA to 50mA nominal load?

Thanks!

DLH