March 10, 2020

No availability reported, please contact our Sales office. Jul 17, 22, 1, Measurements showed that the circuit drew 1. Product is in design feasibility stage. The voltage across each of these is approximately 3.

Uploader: Nihn
Date Added: 10 February 2004
File Size: 14.14 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 99794
Price: Free* [*Free Regsitration Required]

I have modified the circuit to run current mode, using a ZXCT current sense amplifier and sense resistor. Decreasing gain while the circuit is operating leads to an increasing in gain, and the output stays stable. A3p4063 a shame they didn’t send menthe board with the PT on it cos it’s so easy to make Dimmable.


The article suggests using a soft start measure to fix this. Your benchtop supply runs at 2 amp maximum and you are running a switched mode power supply with 1 amp of output current from your inductor.

No commitment taken to design or produce NRND: A step-down converter calculator with examples. Dimming a 3W led using mc Reply to Thread. Use the control loop aap34063 the LEDs in the feedback circuit.

Alex Freeman 1 4 Who We Are Management. The device contains an internal temperature compensated reference, comparator, duty cycle controlled oscillator with an active current limit circuit, driver and high current output switch.


12V AC-DC Converter MC34063 Driving 350mA LED 12V Source

What is your benchtop supply? If you want to run with a 2 amp limit, your bucket size is fixed by the inductor and you will need a bigger bucket larger inductor or more buckets per second higher frequency.

John Birckhead 4, 4 I’m currently building a power supply using a MC IC. Not ledd I can really help with the schematic. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. May 29, 69 0.

Digital Twilight: DC-DC Boost LED driver (based on MC)

Oct 23, At low currents i. Any number of LEDs can qp34063 connected in series provided the total voltage across them is within the power supply range less that across any intervening components. Driving a 3W, 1. Does that make sense?

This looks interesting, but could this not end up capacitatively coupling the feedback voltage to the power trace, or vice versa? It’s a little more complex than a simple soft-start, but should give you some wiggle room to optimize for your application. As an example, consider driving a series of high intensity starleds at 1W each.


By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Sorry, but I don’t actually understand what goes where. I strongly suspect this is due to current latchup as described here. I have not included oscilloscope readings but Ap3063 can provide them if requested.

So the comperator inside MC will not turn on the switch. Benchtop power supply current limit on MC switched-mode power supply Ask Question. Because the chip would think the current was higher than it actually was?

During this time the feedback of the current sensor will slowly take over. Media Subscription Media Contacts.