Led step-up converter identification help

[jerryk]

I have a board that has two led outputs that are driven by the attached circuit layout below.  U10 is marked RY6SA and appears to be a dc/dc step-up led driver of sorts.  The voltage at each led is 34V and the input voltage is 12V.  I would like a look at the datasheet for U10 but keep coming up dry on which IC it is.  Any suggestions?

Another question is - Can this step-up converter be driven without the load of the led?  I'm worried I might have messed up by turning it on without a load.

Jerry

[fzabkar]

SY7301, Silergy, High Current Boost LED Driver, 2.8V - 40Vin, 2A, marking RYxyz, TSOT23-6:
https://uploadcdn.oneyac.com/attachments/userfile/20/c5/1596011741476_5635.pdf

[jerryk]

Thanks for the datasheet. I'm still amazed what you can find.  I spent hours on that and came up empty.  It does appear that I can enable the boost converter without a load but there is a problem.  The capacitors hold their charge without the leds connected.  My goal is to reverse engineer the input from the microcontroller to the enable pin.  The enable pin is connected directly to the microcontroller pin so the only way to isolate it would be to remove the boost converter which I would like to avoid.  If I connect the leds they draw too much current for this 3cell battery simulator I made and it causes the input voltage to oscillate.

So the goal now is to put an alternate load across the led+/- pins to have the circuit still work but at a much lower current draw.  I am trying to measure the flashing sequence timing with an oscilloscope so I can attempt code this into a replacement microcontroller.  There is a real chance that I'm doing this the hard way.

Any ideas appreciated.

Jerry

[fzabkar]

The current draw would be set by the current sense resistor on the FB pin. ISTM that you could use resistors in place of the LEDs.

BTW, I've been staring at Silergy chips and datasheets over the past month, so I immediately recognised the ABxyz format.

Then I searched for ...

https://www.google.com/search?q=filetype%3Adoc+OR+filetype%3Apdf+"absolute%20maximum"+silergy+RYxyz