LP5867: LP5867

Hi Eduard,

Yes, LP5867 can do it.

BR, Jared

Thanks for answering. 

I need 200 ma current pulses of up to 5 msec for leds. Maximum 3 leds together. Is it possible to use Matrix family devices?

If yes, how can I set this current in 50ma or 100ma matrix type devises?

Hi Eduard,

Could you please tell me what kind of LED matrix you want to use? I think you should know that the current is related to the matrix topology since you said you need 200mA current pulses for maximum 3 LEDs together.

If possible, please tell me your current requirement and how many LEDs you want to control. Then I will help to find a solution for you.

BR, Jared

Hi Jared,

I need to lighting ~30 leds with pulse of 5 msec or less, each time 3 leds together with 200ma(serial or parallel). I have 3.2v battery and I don't interesting to use boost converter to save energy and heat. Practically after pulse follow long "off" period about 10-12 times of on. The system controlled to be below 42C temperature, temperature regulation performed by increasing of "off" period.

Eddy

Hi Eduard,

One more question, since you are looking for matrix topology LED, can I understand that you need control each LED individually?

BR, Jared

Hi Jared,

I am not need each led control, but every 3 leds should lighting together, but all together about 30 leds. It could be 10x3 channels with pwm control. It could be easier if 3 leds will be in parallel(600ma), no need boost converter.

Eddy

Hi Eduard,

Actually, the maximum current of our LED driver is about 100mA per channel and based on my experience, I think the general RGB application doesn't need such high current. What I mean is that if you need 200mA per LED, it means our LED driver needs 200mA per channel or you need to connect 2 channel together for one LED dots.

Could you please tell me what's your end equipment?

Based on your description so far, I think you can use 4pcs TLC59116/TLC5911F to control all 30 LEDs.

BR, Jared

Jared,

We are not general RGB application, it is medical design. I must 200ma pulse. is it possible to set Rext of TLC59116/TLC5911 for 200 ma and control by pulse? If 2 channels connected to one led is working, it is also possible solution. 

Eddy

Hi Eduard,

Actually, I recommend TLC59116 since I consider the control by pulse. TLC59116 can control the frequency of output PWM dimming by internal register.

And I think 2 channels connected to one LED should be no problem.

BR, Jared