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MOSFET driver for controlling common cathode LEDs
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Topic: MOSFET driver for controlling common cathode LEDs (Read 74 times)
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Remark
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MOSFET driver for controlling common cathode LEDs
«
on:
Yesterday
at 04:31:55 pm »
Hello,
I have encountered a problem controlling 24V LEDs using a transistor. According to the common cathode LEDs configuration, I finished my design with N-channel and P-channel MOSFET drivers for high-side switching, where the MOSFET is turned on with a low signal and turned off with a high signal. However, when simulating the schematics, I noticed some voltage across the simulated 'LED' when the 'driver' is switched off. Could I ask where this voltage comes from and why it isn't zero or near zero when switched off?
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tooki
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Re: MOSFET driver for controlling common cathode LEDs
«
Reply #1 on:
Yesterday
at 04:57:03 pm »
Quote from: Remark on
Yesterday
at 04:31:55 pm
Ummm… take a closer look at the “some voltage”: it’s 5.8ᴇ-5.
You
do
know how to read scientific notation, right?
That means 5.8 x 10
-5
V = 5.8/100000 V = 0.000058 V = 58 microvolts.
That’s very much “near zero” in the context of 24V.
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Yesterday
at 05:02:35 pm by tooki
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MOSFET driver for controlling common cathode LEDs
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