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  1. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    I've done the mathematicals with the values from the evaluation board where Rcomp is 2k and Gcs=0.0001 comes closest: (24.5 + 0.8) / 0.8 * (5000 * 0.000023 * 2 * 3.1416 / (440 * (1 - 0.714) * 0.0001)) = 1816~ or if i use an absolute value for GEA its 100: (24.5 + 0.8) / 0.8 * (5000 * 0.000023 *...
  2. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    It cant be that old, the datasheet date is 2016! One could test the equations with the component values on the evaluation board.
  3. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    I use windows calculator and dont bother trimming the extra digits of precision.
  4. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    As I mentioned above, see this post: https://www.electronicspoint.com/forums/threads/create-controlled-50v-pulse.290795/page-2#post-1783396 I'm using a 500mm diameter 250mm focal length(f0.5) precision Fresnel lens with an aluminium frame I made to hold the 172w led at just the right distance...
  5. CommanderLake

    Create controlled 50v pulse

    I prefer Sigma lenses of which I have 3 because one gets more for ones money and the sharpness and chromatic aberration performance are amazing from comparisons I've seen.
  6. CommanderLake

    Create controlled 50v pulse

    When I say I do all of the above that's excluding the optical trigger. Nice pictures, I should get a macro lens. On the subject of microcontrollers and programming, I started experimenting with making a boost converter regulator out of the pulse generator circuit and in turn optimizing the...
  7. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    The light isn't for the car itself I just want to be able to power it from a car efficiently and it's a great opportunity to learn more about switch mode power supplies, see this post: www.electronicspoint.com/forums/threads/create-controlled-50v-pulse.290795/page-2#post-1783396 I'm almost done...
  8. CommanderLake

    Create controlled 50v pulse

    I do all of the above but with a full frame Canon EOS 6D and a fast lens up close the plane of focus is probably a millimeter or 2 deep and the blades aren't all in the same plane. Anyway with continued development with the picaxe firmware I made an adjustable PWM output with a pulse...
  9. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    What does the compensation network do and do I really need to implement it?
  10. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    Thanks Harald, that makes sense, but what is the other resistor without a label connected to the CS pin for? Edit: the datasheet for the MP4008 evaluation board (EV4008) shows the unlabelled resistor connected to the CS pin is 100 ohms.
  11. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    I'm stuck on page 14 of the MP4008 datasheet... Assuming a 13.5v input, an inductor value of 10uH, an input current of about 14.2A and an inductor P-P ripple of 5.4A also assuming Rcs1 is the resistor from CS to the output of M1 and Rcs2 to ground (see page 16) I get an Rcs1 value of 0.014 and...
  12. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    I've chosen this instead: www.digikey.co.uk/product-detail/en/MP4008GS-Z/1589-1654-1-ND/9433420/?itemSeq=287357277 I'm trying to calculate the component values on page 14 but its so complicated, is there an easier way to design the circuit?
  13. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    I could use this: https://uk.farnell.com/richtek/rt8462gs/led-driver-1mhz-sop-14/dp/2377614 but the datasheet shows an LED current up to 400mA on page 8 and theres a 0.47 ohm Rsense resistor in series with the LED, could it be used for a higher current with a lower Rsense resistance?
  14. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    All impossible to solder by hand.
  15. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    Yes I've been looking for hours and cant find what I need, please suggest one.
  16. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    I would like to power one of these: http://uk.farnell.com/jsp/search/productdetail.jsp?sku=2816596&CMP=i-bf9f-00001000 from a car current regulated at up to 3.6A 50v, I've spent days searching for the most efficient solution but I cant find a boost converter controller in an easy to use package...
  17. CommanderLake

    Create controlled 50v pulse

    I got a 1GS/s Picoscope 2208B to analyse the final working prototype and the rise and fall times are <30ns. I just did a test at 1us of a 23cm desk fan rotating at 1960 RPM, thats a velocity of 23.6 M/s. Using a Canon EOS 6D and a Sigma 85mm f1.4, processed with DxO PhotoLab. The exposure is...
  18. CommanderLake

    Create controlled 50v pulse

    OMG I just realised I dont need the small MOSFET to switch the PWM signal on and off I can just use the enable pin on the UCC27524! I did have it working but accidentally connected the output of the 5v regulator to the output of the UCC27524 therefore burning it out, I was tired and its an easy...
  19. CommanderLake

    Create controlled 50v pulse

    Have you used one of these high power LED's, with small low voltage LED's that have a very narrow margin between vf and the current limit yes it does help to use current regulation but with this high power LED the margin between vf and full power is 11-12v that's plenty of room to find the right...
  20. CommanderLake

    Create controlled 50v pulse

    I'm sorry I didn't tell you more sooner but often if I give too much info too fast it adds confusion so I feel I owe you some pictures: 2:40PM, not the brightest day but day nonetheless, on the right is a very bright 35w Xenon torch, on the left... well you can guess: Here it is shining on...
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