911alertme
New Member
I would like to make some axillary LED lighting for my vehicle. There are several ready to go solutions but all the ones that I have been able to find are lowish power buck solutions. I don't really want to buy a bunch of buck drivers to power three LEDs each. That could get expensive as I'm looking to drive probably a couple hundred watts worth of high power LEDs (30 - 60 maybe. I don't know yet). The best solution I can find so far is an IC from Linear and use 2+ of them.
It is the LT3755 IC. In the datasheet, it has a typical applications section. One of the examples is a 50 watt automotive LED driver. It gives a schematic but that is about it. The example can be found on page 18. It is a typical schematic that labels parts as D1, M1, etc. It gives part numbers for these parts but a search for some of them doesn't give me anything.
The listed parts other than reistors and capacitors are:
L1 - "COILTRONICS DR127-220" **broken link removed**
M1 - "VISHAY SILICONIX SI7850DP" here
D1 - "DIODES INC. PDS5100" here
M2 - "VISHAY SILICONIX SI2308DS" here maybe. No stock. And here.
RT1 - "MURATA NCP18WM1045" I have no idea what it is. Google search brings up 4 results.
D2 - "IN4448HWT" again no idea. Few results.
Also, I have no experience with electronics design. I could probably design the PCB and there is a local shop that will make it. As for soldering, I think I have that down too. All parts that can't be hand soldered can be done on a hot plate.
Also, I would like to be able to dim the LEDs. The IC supports PWM but I don't know much about that. The PWM section metions duty cycle but I need it to be on all the time. The datasheet mentions analog dimming but there are no details on it. Whatever decision I decide on for dimming, I want it to be via an external pot. Its late and I'm sure I missed some stuff in this post but will answer questions tomorrow.
Also, if anybody else has a better solution, speak up please.
Thanks in advance,
Spencer
It is the LT3755 IC. In the datasheet, it has a typical applications section. One of the examples is a 50 watt automotive LED driver. It gives a schematic but that is about it. The example can be found on page 18. It is a typical schematic that labels parts as D1, M1, etc. It gives part numbers for these parts but a search for some of them doesn't give me anything.
The listed parts other than reistors and capacitors are:
L1 - "COILTRONICS DR127-220" **broken link removed**
M1 - "VISHAY SILICONIX SI7850DP" here
D1 - "DIODES INC. PDS5100" here
M2 - "VISHAY SILICONIX SI2308DS" here maybe. No stock. And here.
RT1 - "MURATA NCP18WM1045" I have no idea what it is. Google search brings up 4 results.
D2 - "IN4448HWT" again no idea. Few results.
Also, I have no experience with electronics design. I could probably design the PCB and there is a local shop that will make it. As for soldering, I think I have that down too. All parts that can't be hand soldered can be done on a hot plate.
Also, I would like to be able to dim the LEDs. The IC supports PWM but I don't know much about that. The PWM section metions duty cycle but I need it to be on all the time. The datasheet mentions analog dimming but there are no details on it. Whatever decision I decide on for dimming, I want it to be via an external pot. Its late and I'm sure I missed some stuff in this post but will answer questions tomorrow.
Also, if anybody else has a better solution, speak up please.
Thanks in advance,
Spencer