I am a beginner in the field of MOSFET switching circuits, and I am currently designing a bidirectional MOSFET switch using N-channel MOSFETs connected in series back to back source mated. I am using a TLP250 driver as shown in the image below, and I am currently confused about how to connect the driver to the MOSFETs.
After searching for several references, I became confused and interpreted two different methods for connecting the MOSFET with the driver, the schematics are shown in Figures A and B below:
In schematic A, the gate pin of the MOSFET is pulled down to GND, while in schematic B, I connect the Source pin directly to GND ( Or should it be pulled down to GND? )

I am really confused and want to ask if anyone is familiar with this circuit, or if my interpretation is still incorrect?

 

It depends upon the voltage and polarity of the load/source signals you are trying to switch for circuit A.

Circuit B connects the signals to ground.
I assume that's not what you want.

 

It depends upon the voltage and polarity of the load/source signals you are trying to switch for circuit A.

Circuit B connects the signals to ground.
I assume that's not what you want.

my load just an LC connected in series and the source is Li-ion battery, but it need the switch to be able to transfer energy bidirectionally
And the idea for circuit B came from journal i found online that looks like picture below it is combination of A and B, but idk why they connect Source pin to the GND
And I still confused whether to connect the source pin to GND or not

 

my load just an LC connected in series and the source is Li-ion battery,

If the battery voltage is positive with respect to ground, than the gate voltage must be at least 10V (5V for a logic-level MOSFET) above the battery voltage to fully turn on N-MOSFETs.
If you don't have that high a control voltage available, the you should use P-MOSFETs, not N-MOSFETs for the switch.

Connect the sources to the gate connection with a 10kΩ resistor.

 

If the load doesn't have to have one terminal grounded then you could do low-side switching with N-MOSFETs.

 

You need to state exactly what You are trying to accomplish overall.

"If" what You want to do will actually work,
there are probably more than ~10 different ways to do it.

To create an isolated AC-Switch using N-FETs, hear's what I would suggest ........
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If the battery voltage is positive with respect to ground, than the gate voltage must be at least 10V (5V for a logic-level MOSFET) above the battery voltage to fully turn on N-MOSFETs.
If you don't have that high a control voltage available, the you should use P-MOSFETs, not N-MOSFETs for the switch.

Connect the sources to the gate connection with a 10kΩ resistor.

I am trying to create a battery voltage balancing circuit and have previously attempted to use P-channel MOSFETs. However, due to the switching frequency, there was noticeable switching loss that affected the circuit's performance. Therefore, I would like to try using N-channel MOSFETs now.
and about 10k ohm resistor between gate and sources, is it for the P-channel or N-channel configuration? or both? because i already implemented on my previous attempt with p-channel MOSFET and not sure about the N-channel configuration

You need to state exactly what You are trying to accomplish overall.

"If" what You want to do will actually work,
there are probably more than ~10 different ways to do it.

To create an isolated AC-Switch using N-FETs, hear's what I would suggest ........
.
.
.
View attachment 301703
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I remember I once asked the same question to you, but I didn't have the chance to provide details about my needs.
So, I am currently creating a battery voltage balancing circuit for a battery arranged in a series of 3, some kind of early DIY BMS, where I need a bidirectional MOSFET switch at each battery terminal which connect the source battery with the load of LC resonant tank. something that looks like image below. currently designing the mosfet switch as i asked earlier and already tried with P-channel mosfet but i have some issue with switching loss and want to try N-channel configuration. unfortunately i couldn't found any photovoltaic driver in my country and decided to use optocoupler driver and encounter this problem
View attachment 302029

 

How much Current do You expect to be handling with your charger ?

It is not worth the hours of trail-and-error design and testing that will be required
before You arrive at a reasonably functioning Circuit,
which is likely to only be capable of ~1 to ~2 Amps in a compact SMD design.

There are excellent, commercially available, Charger/Balancers, selling for ~1/2 the
amount of Money that You will ultimately be spending on creating your own design.

A High-Current "Brute-Force", fully Linear Charger/Balancer,
which is generally not commercially available,
and can be custom-built to handle serious Charging-Current,
is feasible, and not terribly expensive.
But it is also not "compact" by any standard,
because of the large Heat-Sinking/Cooling-Fan requirements.
This is the type of Charger that many R/C Hobbyists wish they could find.

If your charging needs are less than ~5-Amps or so,
I would suggest purchasing a commercially available Charger/Balancer,
it will save You some serious headaches.

Here's the Schematic for a very serious DIY Charger/Balancer ...........
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I am trying to create a battery voltage balancing circuit and have previously attempted to use P-channel MOSFETs. However, due to the switching frequency, there was noticeable switching loss that affected the circuit's performance. Therefore, I would like to try using N-channel MOSFETs now.

The switching speed of a P-MOSFET is not significantly slower than an N-MOSFET, so if switching speed is your problem, changing MOSFET types will likely not help.
MOSFET slow switching speeds, are usually from the gate drive not have sufficient current drive to rapidly charge and discharge the MOSFET gate capacitance to it's full ON and OFF voltages.