Hi Everyone,
I am just in the process of designing a circuit to run some high power LEDs and I am looking for some advice and feedback.
I have attached a schematic for one of the individual channels and the top/bottom layer of a 4 channel board.
For the schematic I have the following BOM (all from mouser):
D1 - CD1206-S01575
R1 - RK73H2BTTDD1000F (100ohm 1206 SMD)
C1 - VJ1206Y104KXAMC (0.1uf 1206 SMD)
C2 - C3216Y5V1H475Z (4.7uf 1206 SMD, not actually on the schematic, it sits between DRAIN and GND)
U4 - STCS1PHR (Power SO8)
Currently R2 will depend on the current output I want, I am looking at 950ma and 1450ma output so I will need to calculate them (I think the equation is 100/OUTPUT to get the resistor value).
I have built this schematic from the STCS1PHR datasheet and another sample I found on google, I am unsure if the components I have selected are correct or if I am way off.
With the PCB's I have combined 4 channels and laid out them out on a 7cm x 7cm board, the RJ45 socket will be used for PWM control from a microcontroller. This is my first PCB design so I am sure there will be some rookie mistakes there!
I am a little unsure with the PWM input though, from the datasheet it looks like the input needs to vary between 0 and the value to vcc (in my case vcc will be around 30v). I am used to PWM being between 0v and 5v and have used this on another setup I played with (using an OnSemi 1A chip, CAT4101).
For the PWM do I need to run a 0-5v input through a transistor or something to amplify it?
Any input would be greatly appreciated as I am pretty new to the design side of electronics but have played around alot in the past.
Cheers,
Dean
I am just in the process of designing a circuit to run some high power LEDs and I am looking for some advice and feedback.
I have attached a schematic for one of the individual channels and the top/bottom layer of a 4 channel board.
For the schematic I have the following BOM (all from mouser):
D1 - CD1206-S01575
R1 - RK73H2BTTDD1000F (100ohm 1206 SMD)
C1 - VJ1206Y104KXAMC (0.1uf 1206 SMD)
C2 - C3216Y5V1H475Z (4.7uf 1206 SMD, not actually on the schematic, it sits between DRAIN and GND)
U4 - STCS1PHR (Power SO8)
Currently R2 will depend on the current output I want, I am looking at 950ma and 1450ma output so I will need to calculate them (I think the equation is 100/OUTPUT to get the resistor value).
I have built this schematic from the STCS1PHR datasheet and another sample I found on google, I am unsure if the components I have selected are correct or if I am way off.
With the PCB's I have combined 4 channels and laid out them out on a 7cm x 7cm board, the RJ45 socket will be used for PWM control from a microcontroller. This is my first PCB design so I am sure there will be some rookie mistakes there!
I am a little unsure with the PWM input though, from the datasheet it looks like the input needs to vary between 0 and the value to vcc (in my case vcc will be around 30v). I am used to PWM being between 0v and 5v and have used this on another setup I played with (using an OnSemi 1A chip, CAT4101).
For the PWM do I need to run a 0-5v input through a transistor or something to amplify it?
Any input would be greatly appreciated as I am pretty new to the design side of electronics but have played around alot in the past.
Cheers,
Dean
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