• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 65 subscribers
  • Views 208 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

LMZM33604: INTERNAL LDO

Shibuya
Intellectual 2985 points
Part Number: LMZM33604

Hello

1. Internal LDO

Could you tell me how muc efficency imporve if the internal LDO is used?

Best regards,

Tetsuro

  • 0
    TI__Mastermind 19891 points
    Hello Tetsuro-san,

    The overall efficiency improvement will depend on the operating conditions (switching frequency, input voltage, output voltage).
    Can you please provide the application conditions?

    Cheers,
    Denislav
  • 0
    TI__Expert 8130 points

    Hi Tetsuro,

    Powering the internal LDO through the external BIAS_SEL pin will increase the efficiency as much as a couple of percentage points. It will all come down to what your operating conditions are.

    Can you provide me with the following info: What is your input voltage, output voltage and output current? Are you tying your BIAS_SEL to Vout or an external power source? If an external power source, then what is the voltage?

    Regards,
    Alejandro

  • 0 in reply to iAlejandro
    TI__Intellectual 2985 points
    Hello Denislav and Alejandro

    Thank you for you comment. Here is application condition.

    Input Voltage: +24V
    Output Voltage: +5V
    Output Current: 4A(max)

    Best regards,
    Tetsuro
  • 0 in reply to Shibuya
    TI__Expert 8130 points

    Tetsuro,

    The image attached below demonstrates typical bench test data  from an EVM for your application conditions. At a max load (4A) there is about a 1% efficiency increase when BIAS_SEL is connected to an external power source. Notice that at lower loads applying an external power source to BIAS_SEL can increase efficiency about 3%.

    Regards,
    Alejandro