PT – LED Driver with Dimming. PTB89E Package SOT PT – LED Driver with Dimming Downloads. PT Datasheet. Description. LEDs need constant current, for example normal LED has mA constant current, but V varying voltage, this board do this kind of work. So I built a pt circuit to control my LEDs! it has a Ohm resistor so it should give me ~ma of current!.
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dc dc converter – PT LED driver – Electrical Engineering Stack Exchange
So I won’t destroy more circuits. Plus the heat and current problems. PT Led diver Ppt4115 to Thread. I made some pics. I lost one led because of this. Sep 17, 8, 1, That means that all current flows through it at its expense.
Feb 4, Tomorrow I’m gonna buy a few more. Now I just attach the pcb file.
Why are you using a resistor as the load? Quote of the day.
PT4115 Led diver
Last chance;] I’m just hoping, the problem was a DC supply. I didn’t connect it correctly. Spark around pins Below is the schematic and the PCB board: The SW pin of the device is a fast switching node, so PCB tracks should be kept as short as possible.
I have to turn it off and oon after a few secs.
PT4115 Datasheet PDF
It should help us to concerntrate to this problem. No, create an account now. It is very strange and confused me.
But last time I didn’t. A typical idea to save parts and money.
Why is that chip heating like that? Pad isnt soldered well? But the chip was burning, so I switched off. The sparks are inductor’s way to keep the current on if all pt41115 voltage drop routes are off.
To me it looks like there’s flux between the pins, and there’s current flowing through the flux.
But in truth the whole layout needs redone. I connected multimeter instead of led. Is it because I use lab power supply? Ill take a pic tomorrow.
That indicates that the problem is the flux. Oct 29, 6, 2, This is actually funny, but I burned the last chip Do you already have an account? I replaced the IC a couple of times.
Sign up using Email and Password. Assuming the diode is still good, the layout of the board is really bad. I’ve had ma through a garden lamp F pt411 pin chip, but that was pt115 accident testing an LED in circuit. Pt415 diode Ppt4115 is bidirectionally non-conductive or disconnected. I have some suspects, but I wanna see how you made it.
I checked every pin of the IC and didn’t find any short or something wrong. Can you add a picture of your circuit? PT with Vitamin E Posted by spinnaker in forum: Yes, my password is: It’s designed to drive an LED. The chip is rated up to 5 volts in battery power which it can double with charging input and discharge limiting.