Hi All,
Our customer has evaluated TPS7A4001 and they are performing 800MHz noise immunity test at their PCB. Then they confirmed that Vout is dropped linearly when noise source (antenna) is located closely. I'd like to have your comment for following questions to find workaround.
- Condition
- Vin = 55V
- Vout = 3.3V
- Iout = less than 10mA
- Question
- Do you know such output voltage drop linearly due to RF noise?
- Is the strength of noise immunity depend on devices? For example is there possibility that this behavior is solved by replacing other device with the same PCB layout?
- I guess that the FB line is affected due to bad PCB layout. Then is adding capacitor between FB pin and GND effect to noise immunity?
Your comment will be appreciated.
Best Regards,
Sonoki / Japan Disty