TPS92515AHV-Q1: difference with TPS92515HV-Q1

Hello Dongbao,

The TPS92515HV has a turn-on calibration which will make the current regulation set-point more accurate.  The downside to this is during power on, on some devices near the 5 mV threshold it can be set to one current or another, basically a bit changing in the turn-on calibration.  This will cause a 5 mV change in the current sense regulation point.  At full current this is fairly insignificant.  If deep analog dimming it can become noticeable during power cycles.

The TPS92515AHV removes this calibration circuit so it will always power on at the same set-point.  The set-point accuracy will we lower with this part since it is not calibrating during turn-on.  The advantage for this is at low dimming, while not as accurate, it will not change during a power cycle.  Look at the regulation accuracy between the two parts in the datasheet.

It depends on what is preferred for their design.  The good thing is the layout is the same for both so they can both be tested.  Note that the bit changing during power on is a small percentage of parts where the IC operation is near a bit change during turn-on, most parts will not do this.

Best Regards,