• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 362 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LP5907: The PSRR

chentsu chung
Mastermind 6180 points
Part Number: LP5907


Hi Team,

The PSRR of LP5907 is 82 dB at 1 kHz.

1. What kind of application needs LDO has good PSRR at 1kHz?

2. For 1kHz PSRR, what kind of noise will be blocked?

Best regards,

C.T.

  • 0
    TI__Mastermind 37155 points

    Hi Chentsu,

    PSRR is important for many various applications.

    At 1KHz you would be more interested in audio frequency applications, to filter out noise which can be heard by the human ear.

    At 100KHz you can make quality comparisons between LDO's of different manufacturers, so this is a good frequency to review this metric.
    Additionally, motor driver circuits tend to operate in the dozens of KHz, so PSRR at 100KHz would be a good metric for these applications.

    For switching converter applications you would want PSRR anywhere from the low hundreds of KHz to even as high as 2MHz.

    The noise which is blocked by the LDO in the PSRR spec is conducted noise.

    If I have answered your question, please click the "Resolved" link.

    Thanks,

    - Stephen