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tps53353 do not work,output is Triangular Wave

zan zhan
Prodigy 190 points
Other Parts Discussed in Thread: TPS53353, TPS53355

I use tps53353 to produce 3.3V on a 16 layer PCB. but it can not work, output is Triangular Wave.

Could you help me to check my schematic and PCB layout ? I am eager to make it clear, the progress of this Board  is halted by tps53353's problem.

Schematic is the following

Layout is the following

output wave test on C135 is the following

  • 0
    Prodigy 30 points
    Hello,
    I am facing the same issue. I have design using TPS53353/TPS53355 Vin- 12V , Vout -5V. This design works good for 10A load but as I increase the the load thre is some some sound and also the output becomes a triangular shape waveform. Vin i.e. 12V is stable, on probing VREG i found that there is periodic dip of arounfd 1.3V, and because of this it is failing. I ahve no clus why is it so. Decap is also placed closeby.