How to power 70 laser diodes without one laser failure causing all to stop emitting light

I forgot to state the obvious: "with consideration of fewest parts and lowest cost"

hello Cyrus

May I ask the application here?

The input power supply is 120AV/240Vac? So basically the system structure should be 120AV/240Vac input --> AC-DC converter--> laser diode driver. Do I understand this correctly?

Hello Mason and thanks for your reply.

The application is Low-Level Light Therapy (see FDA medical device description).

Yes you understood correctly.

hello Cyrus

Based on your requirement, we need to choose either multi-chip solution or multi-channel solution. RGB device which can support multi-channel LEDs may do it. Let me further check and get back to you.

Very kind of you Mason.

Hi Ives,

Tremendously helpful reply. Thank you very much.

I requested samples from TI.

feel free for more discussion. I will close the thread at this moment.

Hi Ives,

I need some clarification, please.

1) You said each CS can supply 100mA, but the "LP5868 8 × 18 LED Matrix Driver With 8-Bit Analog and 8-/16-Bit PWM Dimming datasheet" specifies Ics max as 50mA for Vcc>3.3V

2) Am I correct that Vled must be a constant voltage supply with minimum current = 144 * 50 mA  = 7.2 Amps?

Thanks.

also,

3) Why can I not find documentation on the "T" part (LP5868T )?

Hi，

The LP5868T will release on next year 2Q-3Q，now we have LP5868，the difference is the output current of LP5868 is 50mA and LP5868T is 100mA.

Thanks！

Hi，

For your question2，we only have 18 current sink and it is based on matrix topology，for LP5868 we have 8 scan FET，so it can drive 18*8 LED dots，but the total current is 50mA*18

Thanks！