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TPS92518HV-Q1: TPS92518 HV dynamic response and driver ability

eric ma
Prodigy 15 points
Part Number: TPS92518HV-Q1
Other Parts Discussed in Thread: TPS92518

Hello TI expert,

I met with a technical problem with TPS92518 HV chip.   i use this chip to work with TPS92662 , realize matrix function.

when i set up the Tpk =40, Toff=40, the coill is 470uH, the TPS92518 chip output current is about 100mA.

Work with TPS92662,  i set the phase is 0, width is 40  for first LED, it can light up normally. set the phase is 10, width 40 to light up is ok, but the  led is dimming.  when set

phase is 20 width 40 to light up the third LED, the second led is off. , it seems that the dynamic problem.

I see the tps 92518 chip about shunt part, but don't know how to use it. could you pls. check and give me some suggestion?

thx a lot in advance.

  • 0
    TI__Mastermind 19075 points

    Hello Eric,

    Can you provide me with waveforms?  I need to see the SW node, the Inductor current, Vout during this condition and the other conditions where it isn't a "problem".  I also need to know all the register settings.  

    We may have to take this offline if we need to talk about the 662 because that is a gated item.  Lets start with the 518 operation then go from there.

    -Francis Houde