UPDATE (2021-Jan-16) - All working as expected - Project link for anyone to build or do as they please.
PAM2804, I've been trying to use this chip for a single Li-ion cell flashlight project, but it does not work for me. I've designed 2 PCBs so far, but both failed.
I'm driving a Cree X-Lamp XML @ 1A.
I can see voltage on the output, but the LED does not light.
1st PCB was a 2 layer; 2nd PCB was a 4 layer with 2 inner ground layers.
Anyone kindly point out what I might be doing wrong please?
My schematics: **
- For testing I have only solder the PAM2804 side. For now ignore reset of the circuitry please.
- Direct power injected from a charged Li-ion battery at C1.
- Sorry I have no oscilloscope at the moment. It's on it's way. **
My 2nd PCB:
U1 Pin 1 - 4.092v
U1 Pin 2 - 3.258v strange this is GND
U1 Pin 3 - Starts at 3.3v and goes down to 3.089v and stables.
U1 Pin 4 - 4.092v (same as C1 voltage)
U1 Pin 5 - Starts at 3.475v and goes down to 3.369v and stables.
C1 - 4.092v
C7 - Starts at 3.3v and goes down to 3.085v and stables.