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Part Number: TPS795
hi TI expert
now，used tps79501 convert 1.2V，at the power up,found the curve was not monotonou,has much step , could you give some support ,
the same issue was found at tps79318,refer the second data
thelike the picture
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In reply to fangyi jiang:
Best, Eric Preiss | Applications and Validation Engineer | Linear and Low Dropout Regulators | Texas Instruments
In reply to Eric.Preiss:
1V2's circuit for your information,1V2 and 1V8 have the same input 3v3 source.to test 3v3,the signa of power up is perfect,have no step, 1v2 and 1v8's load was ov2718,TPS79501 has 4 steps and TPS79318 has 1 step from the capture data,the below data is from PMP3782 Test Results down load from ti website
from this, can be found some step at timebase 100us.what my capture data was at 40us, can be seem exactly
1. Could you capture a scope shot showing 3.3 V, 1.8 V and 1.2 V together on one screen?
oscilloscope was borrowed by other guys, so i will test later
2. Do you have any other regulated voltages on your board?
sensor board has only two regulated voltage
3. Do you have any ESD diodes on the 3.3 V, 1.8 V or 1.2 V? Do you have any diodes connecting any of these nets?
4. Are you powering both the DOVDD and AVDD inputs to the OV2718 with the one TPS79318 1.8 V output?
5. Can you provide any details from the OV2718 datasheet on expected load current or power draw for each power rail? The product brochure does not provide details.
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