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LM5175EVM-HP: we need this EVM can support for 5V

Palanivelraj Ravisankar
Prodigy 10 points
Part Number: LM5175EVM-HP
Other Parts Discussed in Thread: LM5175

Hi

we need to boost 5v to 12V 12 AMP, whether this EVM support for 5V input

can I use this EVM for 5V input?

(The LM5175 is a synchronous 4-switch buck-boost controller capable of regulating the output voltage at, below, or above the input voltage. The wide input voltage of 3.5 V to 42 V supports a variety of applications. The output voltage is adjustable from 0.8 V to 55 V. The LM5175EVM-HP high power EVM is fully assembled and tested platform for evaluating the operation and performance of the LM5175 buck-boost controller. The LM5175EVM-HP has an input voltage range from 6 V to 36 V, the output voltage is set as 12 V using an external feedback resistor divider.)

/resized-image/__size/320x240/__key/communityserver-discussions-components-files/196/5265.LM5175.JPG

 

  • 0
    TI__Mastermind 19595 points

    Hello Palanivelraj,

    Welcome to the e2e forum.

    The LM5175EVM-HP high power EVM can handle lower input voltages.

    The resistor divider R13 (249K) and R18 (59K) defines that the UVLO threshold is set to about 6V.
    So these resistors could be modified for a lower threshold voltage.

    But this particular EVM makes your life even easier.
    There is a switch which allows you to disable the UVLO mechanism, so that the controller will work down to the lowest possible voltage:
    Just set switch S3 to position 3:

    2.2.2 S2 ENABLE
    This switch enables/disables LM5175 on the EVM, or it can be used to set adjustable VIN UVLO.
    • Switch in position 1 (EN pin tied GND), LM5175 disabled.
    • Switch in position 2 (EN pin tied to resistor divider network consist of R13 and R18), EN pin along the
    resistor divider network to set LM5175 UVLO threshold.
    • Switch in position 3 (EN pin tied VCC), LM5175 enabled.


    You wrote:
    > we need to boost 5v to 12V 12 AMP

    Please be careful.
    The maximum current rating for the LM5175EVM-HP high power EVM is 10A load current @ 6V input voltage.
    At 5V input voltage the load current will go down to about 8A.

    So, 12A load current @ 5V input voltage would be about 50% above the maximum rating.

    Best regards
    Harry