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BL4S200 Digital Output misbehavior

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We are working on implementing your BL4S200 board inside our systems.

We have found a strange issue with them. When powering both the card and the outputs(+Kx) with the same supply, and wiring Kx and a single output:

- Using 24VDC/0.5A power supplies, both for DC output and +Kx, there is a voltage drop of around 4.5 Volts between +Kx and the onboard output when the output is set to "1". Jumpers are set to +Kx.

- This difference is around 0,5V when using 12V supplies (same card and load).

- This difference only happens using onboard digital outputs. Digital IO expansion board and Hi-Current output shows no measurable drop.

This behaviour makes the used LED lamps (rated at 24V) to slightly brighten when the output is deactivated. As far as I can see in the manual, Kx goes through a BJT and a diode, so around 1,5V drop would be reasonable.

Is there anything we are missing?

Best regards,
asked Apr 3, 2018 in Rabbit by lvinolas New to the Community (2 points)
recategorized Apr 3, 2018 by LeonidM

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