Driver LED PT4115

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I’m a beginner and I came across this drive, I intend to use it to control the light of some LEDs using PWM and I also want to make a voltage reduction in a microcontroller (ESP-32) using it too and I wanted to understand a little more about this circuit, because I have some doubts.

For example, I would like to have a:

  • Input: 24 V
  • Output: 12 V

Constantly, without using PWM, and after it add an AMS1117-3.3 to regulate the voltage that goes to the ESP ESP-32, as shown in the image below

But I can’t understand where it will be responsible for regulating the output voltage, because from what I see (Vin) goes straight to R 0.3 Ω and goes to output +, would the resistor be the item that will regulate the output voltage?

I did some tests with some resistors here at home, but the same input voltage, it was on the output, so I would like to know in detail how this drive works

PT4115 datasheet:

enter image description here

My circuit, I already saw that there are some things wrong, but this is more or less the idea I want to do:

enter image description here



edited 12 hours ago

winny's user avatar


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asked 13 hours ago

Leonardo's user avatar



 New contributor

  • Welcome! There are no LEDs in your schematic. Please add them. the LED driver will not regulate output voltage, only current. You can’t use the output of the LED driver to power your MCU without significant headache. There are plenty of switching regulators which will take your 24 V input to 3.3 V for your ESP-32. – winny 12 hours ago 
  • Wow thank you could you tell me some? so i might be searching, thank you again – Leonardo 12 hours ago
  • 1You might find my old test on PT4115 helpful: How can Rpi Python PWM GPIO pins control and dim LED strips of 1W 350mA? – RpiSE, Asked 1 year, 10 months ago, Viewed 892 times raspberrypi.stackexchange.com/questions/122187/… – tlfong01 12 hours ago  
  • 1@Leonardo 1. go to a reputable electronics component seller – digikey, mouser, farnell, rs components… 2. click through to the power control ICs, switch-mode converters 3. enter your requirements 4. Success. – Marcus Müller 10 hours ago

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