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how to measure break in current or current fall

SAMI AHMAD
Intellectual 520 points
Other Parts Discussed in Thread: LM5066I

I  have a LED driver that takes 50V  DC  and draws max 7.2A .  I want to detect if the power supply fails  but since this driver is PWM when I dim the LEDs the input current drops to 10mA . 

do you have a chip that can either detect the break in current or the current dropping below a certain limit.

or the other possibility is that if a chip can give me analog value related to the current I can read it in my micro controller and generate alerts.

thanks

  • 0
    TI__Genius 12621 points
    Hi Sami,

    You can check out these products for current sense amplifiers:
    www.ti.com/.../current-sense-amplifiers-12c-monitors-products.page

    There are "INA" devices which can report an analog current measurement or via I2C. Then there are more advanced devices such as:

    LM5066I (this is a hot swap controller and can turn on/off power between source and load, undervoltage/overvoltage shutdown, limit current or inrush current, has a power good output and can measure current, voltage, power, temperature, and can send out warnings based on programmable thresholds) or

    LM5056 (this is not a hot swap controller, so it just measures current, voltage, power, temperature, and can send out warnings based on programmable thresholds).

    I'm a bit confused about the application requirement though. If you need to detect if a power supply fails, would it be easier to check for voltage going to the LEDs instead of current?

    Thanks,
    Alex