I'm trying to build a board capable of driving 12 V, single-channel, non-addressable strips with the WS2811 protocol for my project. In my case I want to be able to safely switch up to 5 A (but most times way less).
They both share the same schematics, and as you can see use pretty similar designs. They use two MOSFETs to drive the output: the WS2811 IC drives a small RJU003N03 or NX7002AKVL, which then drives a beefier NTD5867NLT4G to switch the high-current flow for the LEDs. Both of those I can't find on AliExpress (which is where I usually look for cheap small batches of electronics for hobby projects).
On hand I have a bunch of IRF3708, which after tinkering with the datasheets I've come think could be driven directly from the IC skipping the smaller MOSFET, but I'm not sure. Do you think it's a feasible equivalent?
Edit 1: looking at it more, shouldn't the 10 kΩ pull-up resistor be connected between OUTR and the 1 kΩ one? In the current configuration it acts as a voltage divider, which may not be ideal.
If it's not suitable, and I would need to keep the double MOSFET design, what components could I use? Since I will be soldering the components by hand, TO packages are preferred.
Also, what do you think about gate resistor values? One design uses 1 kΩ, the other 10 Ω. It's a big difference, what's more appropriate? 1 kΩ seems high, but 10 Ω too low to me. At 5 V, the current would be limited to 5 mA and 500 mA respectively. Given that the WS2811 is intended to be driving LEDs at a constant current of 18.5 mA, I'm a bit confused. 1 kΩ makes sense, if the current that it allows to flow is enough to make the gate switch fast enough for PWM. 10 Ω seems too low, but I'm guessing the small NX7002AKVL could be the limiting factor for appropriate values.
Edit 3: In the comments I mentioned the PWM frequency being 2 kHz, but after further research this may not be the case. From what I found online some sources state different values, but most seem to agree that for WS2811 chips the frequency is at least 400 Hz.