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Hi, thanks for your reply.
Yes, the negative transients only last for about 300-500ns. A negative transient is also present on the SL_x pin (at low FET source), though to a lesser degree (-3.5V instead of -8V relative to gate driver GND). I have attached a scope shot of the transients, which...
Hi, looking for help on my gate driver + FET circuit.
The issue is that the node between the FETs of the half-bridge drops to about -8V relative to the GND of my gate driver when the top FET turns off. I believe that this is largely due to the parasitic inductance of the circuit in combination...
Yes I see now, through the body diode.
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Also, I suppose turn-on and turn-off time can be adjusted by changing the resistor values R1 and R2 of the diagram in post#10. It is quite a simple circuit.
The 80Ohm bypass is required to power the MCU and other electronics when the switches are turned off to both batteries (which is the starting condition). Note that when turned on, the switch will carry over 100A. For the 12V supply, I found the TPS7A4001 (up to 80V input). From this 12V supply...
Thanks for the replies. I think I have found a simpler solution (note that I have flipped the NFETs). In this design however, there cannot be a >6V difference across the switch. Unless perhaps if I put in a seperate 3V/12V supply and gate driver (and level shifter for BATT_ENABLE signal) for the...
Hi, looking for some advice here. My system has two independent batteries connected, each with their own power-disconnect switch. Since current cannot be allowed to flow either way through the switch when off, two MOSFETs are used in a source-to-source configuration to create a bi-directional...
Hello, I'm an EE but a little out of element with power supply design, so I'm looking for some suggestions.
I need to charge a 14S LiPo as fast as possible from a standard 120V/20A wall plug. A fully charged pack is 4.2V * 14 = 58.8V. With the AC circuit able to supply up to 20A at 120Vrms...
Hi, I would like to measure the individual cell voltages of a 14S LiPo battery pack with high accuracy. I am currently using voltage dividers to accomplish this, but since the highest voltage is 14*4.2=58.8V, I need to divide it down quite a bit to sample it with the 3.3V 12-bit ADC in my MCU...
Hi, when moving a wired component in OrCAD PCB Designer 16.0, there are three options for what to do with the etch: (1) do nothing, which leaves the etch alone and just moves the component, (2) Rip up etch, which deletes all etch that was connected to the components, or (3) Stretch etch which...
Yes, and it's a pretty funny looking waveform. Without the LC filter, the LEDs pulsate quite badly. With the filter, it still pulsates but only slightly.
MPPT charge controllers aren't too cheap...
https://www.amazon.com/Morningstar-Sunsaver-TrackStar-Charge-Controller/dp/B006H9VPL6
So probably not worth investing in unless you get up to the 300W PV range.
You might get an extra 30% out of the PV modules with it.
Another option of course, is to use the NPN to disconnect ground from the EEPROM :)
This site might be helpful in seeing the two options, and selecting Rb (scroll about 2/3 the way down):
https://electronicsclub.info/transistorcircuits.htm
I looked into MOSFETs for this purpose, but the package type you've chosen (through-hole) and low gate Vgs requirement (circuit needs to run down to 2V) really cuts down the suitable parts. I think the BC557 as godfreyl suggested is a good choice.
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