It seems like the L2635 is still actually a pretty decent choice even though it is quite old. Is that crazy? Is there something more recent which is better?
EDIT: Ah it’s discontinued so yes it is crazy
Second Edit: It looks like the PD package is still in production, but I’d still love to find something a little more modern
For 48 volts you need something around 70 TO 80V to handle the spikes.
I’m not aware of any fully integrated driver going that high. DRV832x (DRV8323) go as high as 65, try that one? You’ll need a lot of protection to avoid spikes.
It is pretty high, but I don’t know if there are any better with high voltage in a small package. Single channel 5x6mm have much better specs, but of course take up twice as much space. This is the best high voltage one I found when I searched around a while back. 80V, 3.9mOhm. About a dollar each, so several times the price of the one you found, but still not bad in the grand scheme of things.
Yeah, that is a great find. It seems like a little bit of overkill for my application, but it might be worth it for something which is less likely to blow up.
MCACD60N06Y-TP looks pretty good too and it’s a double package…but it’s also a big package and almost twice the price so not much of a win there…and it seems to only be available in the US mostly.
That is the conundrum. I’m getting the impression that there are a lot of options which can be a bit overwhelming. I was hoping there was a community standard tested setup that I could hop on
LKS1D5005D looks like a SUPER interesting option. It’s so compact with very few external components needed. I can’t find much in english about it, but that looks worth exploring. Thanks for finding that! It’s wild that they got 500v rating, that’s so much higher than a lot of the other options out there.
Having to use 6x mode is not ideal since I need to drive two motors on the same board, but they’re being driven by an ESP32 so it should have the power.
The quality of Chinesium is getting pretty good these days!
And at $.75 it seems worth a shot!
I’m a little confused by what is going on here:
Do you have any thoughts on what VCCB and Rbst are? The notes section says to make sure that Rbst can handle the power, but I’m not seeing where that power is specified. The 15v seems like it’s an external source to drive the gate, right?
Edit: All I know about Rbst is that it is that at the grocery store it says that milk doesn’t contain it, so I’ll have to get it somewhere else
VCC Boost = 15V
R Boost (usually around 10 to 100 ohm).
Power probably mean you need to be able to supply around 1A 15V / 1A of gate voltage to the boost circuit. You can get away with much less if you have a big capacitor, say, 22uF next to the boost pin. The 1A is peak current, and the average is less, since the gates are charge / discharge only.
As a non-expert that seems frighteningly high…but maybe I’m not understanding something. LKS1D5007DT is slightly better at 1.1ohm.
The question then is what are the values of Cbst and Rcs. I asked the manufacturer, but until we hear back from them we’re kinda shooting in the dark.
Cbst -
It seems like this is for the charge pump and from what I’m reading the recommended Cbst values for different chips can range pretty widely from 0.01uF to 2uF. Some chips seem to indicate that anything over the recomended value is fine and others say that it can’t be above the recommended value.
I’m going to guess and place a 1uF X7R cap there and hope for the best
Rcs -
Truly no idea what this one does. It seems like it’s probably a current sense resistor, but the chip doesn’t seem to have OC protection or any current sensing capabilities. There is a note which says “In the figure, the sampling method shown is single resistor sampling. The sampling method can be selected
according to the actual situation.” which makes me think that maybe this is a sense resistor to be used by the MCU? Is it optional?
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