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LM5156H: 48Vin to 160Vout boost circuit with adjustable boost current control

Manie Coetzer
Prodigy 110 points
Part Number: LM5156H

Hope that someone could help me with which device is best to use for the following boost circuit application.

- input voltage is +48V with ±4V tolerance.

- output voltage is 160V

- Boost current should be firmware adjustable through analog voltage and should not exceed input current of 3A or 6A (two different configurations)

- Enable / Disable of boost circuit

- Small footprint and high efficiency will be nice.

The LM5156H device can do the boost function but it does not have any current limiting control. Are there any other devices that may have a current limiting control.

Thanks,

Manie

  • 0
    TI__Guru 58215 points

    Hello Manie,

    We do not have a boost converter which can go up to 160V and includes a input current limiting feature. 

    You might add a device like this one: https://www.ti.com/product/LMP8646 In the datasheet you find the connection to limit the output current, at the end you can use it as well to limit the input current.

    Best regards,
    Brigitte

  • +1 in reply to Brigitte
    Prodigy 110 points

    Hi Brigitte,

    Thank you for the suggestion. This is quite a neat trick to limit the current and will remember it for other applications.

    I have found an Analog device part LT3756 that has the current limit build in. Instead of driving an LED string, I use the LED current sense (ISP/ISN) on the input side and then rest as a pure boost circuit. The PWM output is left open as there is no LED string.

    Best regards,

    Manie