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Apologies for the confusion @Tony, I forgot to mention that the supply is driving a LED string which is PWM'ed at a lower frequency to dim it. See attached the waveform of the simulation showing the zoomed out waveform and a zoomed in PWM "burst". Green curve is the primary MOSFET drain, red is...
You make a good point, the 10 pF values for C6/C7 was a simulation estimate before the transformer prototype was made. Just measured the actual values on the transformer pins and it's 65 pF. Could this make such a big difference, you think?
I should also mention that at the time of prototype PCB...
Thanks for the feedback friends, that helped me a lot!
I've made some progress. It turns out that there was a footprint error in the footprint of Q2 on the PCB prototype, which shorted the gate and source together. This caused the output driver to be nearly shorted to ground (through the 0.22...
Thanks for the reply, that's hugely helpful! Indeed I now see I forgot the flyback/snubber network, so will add that.
The coupled inductor is a custom transformer with Lp = 15 µH and Ls = 40 µH on a TDK B66421U0160K187 core. I don't know how to measure the leakage inductance, unfortunately...
Hi everyone,
I'd like some input and/or second opinion from those among you who are experienced with switched mode DC/DC converters, please!
I'm working on a LED driver that runs strings of LEDs at 72 V with a forward current of 600 mA, designed to run from a 24 V DC supply. See circuit and...
Hi all,
I need to find/improvise an adapter cable for the serial output of an instrument.
Documentation only mentions it's a LEMO connector, picture attached, but no part number for a mating connector is mentioned.
And as we all know, there are a quadrillion different LEMO connectors... Don't...
Thank you kindly for sharing your thoughts, I've had a look at the various ICs on Digikey, and the absence of inductors on the PCB narrows down the list significantly because it must be a linear topology rather than a buck/boost/SEPIC one, so filtering on SOIC-8 as package and linear regulation...
I have attached a schematic of the entire circuit. LEDs are in parallel in pairs, and 36 pairs in series. The 1952-LF drivers are in parallel to each other, 4 populated and 2 NC. Note that the double C1 designators in the schematic is not an error, it's also duplicate on the actual PCB.
Brian...
Hi all,
I have a LED panel that started flickering, and I'm trying to diagnose the problem. Picture attached. The circuit is extremely simple: 220V AC is passing through a 2.2 ohm resistor into a small bridge rectifier. Varistor across the rectifier inputs, a small capacitor and 2M resistor...
Hi everyone,
I'm in the design phase of an automation project, in which my team will be in charge of the control electronics and software, and another team will be doing the mechanical design. Due to time, budget, and resource limitations, electronics, software and mechanical design must...
Hi all,
I have a defective KUKA LBR IIWA robotic manipulator, with suspected angular encoder failure in one of the joints. After disassembly of the motor unit which contains BLDC, brake, and angular encoder, I managed to retrieve the encoder board shown in attachment. Unfortunately I can't...
Lasso Loop Recycling is a start-up company near San Francisco, California, with only one objective: keep recyclable materials out of landfills and oceans by applying smart sensing and AI to closed loop recycling. Lasso is looking to expand their young engineering team with additional expertise...
Hi all,
I'm looking for a USB hub controller (how many ports exactly doesn't matter, can work around that) that has status output pins indicating the state of the port. Ideally I'm looking for an output indicating if a device is connected, if that device is initialised, and if communication is...
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