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LMR36510: What is the difference between LMR36510ADDAR and LMR36510FADDAR?

PAVAN P
Prodigy 150 points
Part Number: LMR36510


Could you please let us know what is the difference between LMR36510ADDAR and LMR36510FADDAR?
As mentioned in one of TI's forum ,i.e., FPWM and non FPWM is the difference between them. Could you please let us know what is the difference between non-FPWM and FPWM device.

  • +1
    TI__Guru 74185 points

    Hello

    A device that does not use FPWM (Forced PWM mode) will operate in AUTO mode.

    In AUTO mode the device will automatically switch between PFM (Pulse frequency modulation) and PWM (Pulse width modulation) as the load

    current changes.  At light loads, the device will be in PFM.  This is a variable frequency mode that reduces the power loss at light loads

    and improves the efficiency.  At higher loads, the device enters constant frequency PWM mode.  This gives better transient response and smaller

    output voltage ripple.

    With a device that uses FPWM mode, the switching frequency will remain constant regardless of load current (within the normal operating range).

    This means that the efficiency will be poor at light loads, as compared to a device that uses AUTO mode.

    Thanks

  • 0 in reply to Frank De Stasi
    Prodigy 150 points

    Hello Frank,

    Thank you for detailed information on PWM and FPWM.

  • 0 in reply to Frank De Stasi
    Prodigy 150 points

    Hello Frank,

    Could you please let us know which part number is having PWM and FPWM. (LMR36510ADDAR and LMR36510FADDAR)

    Also, which operation PWM/FPWM has lower output ripple.

    Thanks

  • +1 in reply to PAVAN P
    TI__Guru 74185 points

    Hello

    The "F" device uses FPWM mode.  That mode would have the smallest output voltage ripple.

    Thanks