Ronotte's amazing TPU experiments.

[Jdo300]

Hi Everyone,

Just thought I would post the datasheet for the MOSFET driver. Ronotte is definitely correct about using this chips. The TTL output from the Flip-Flop chip is not strong enough to drive the gate of the IRF840 when it is driving a load (I tried it myself and it just chokes).

I'll be working on a nice board layout this weekend for the circuit if anyone wants it. I'm going to cut mine out on a board prototyping machine here where I work so it'll be guaranteed to work right :-). I'm also going to try to make it small enough to embed the entire chip inside the TPU. One recomendation is that you do not solder the MOSFETs to the board, using the Terminal Blocks like Ronote did is an excellent thought. That way, if you burn one up, it'll be easy to replace.

Here's the link to the MIC4426 Datasheet:

http://www.ortodoxism.ro/datasheets/Micrel/mXsvxzr.pdf

I managed to get a couple of these chips from an Engineer at work so I'll be ready to roll soon .

God Bless,
Jason O

[Jdo300]

Hi Ronotte,

Quick question. What IC chip number corresponds to the the Flip-Flop you are using? From your document, I gather that it is a CMOS SR latch. For my 'pre' control circuit board, I used a 74LS73 JK FlipFlop IC and just tied the J and K inputs to V+ to switch it correctly.

God Bless,
Jason O

[nong]

Hi Everyone,

Just thought I would post the datasheet for the MOSFET driver. Ronotte is definitely correct about using this chips. The TTL output from the Flip-Flop chip is not strong enough to drive the gate of the IRF840 when it is driving a load (I tried it myself and it just chokes).

I'll be working on a nice board layout this weekend for the circuit if anyone wants it. I'm going to cut mine out on a board prototyping machine here where I work so it'll be guaranteed to work right :-). I'm also going to try to make it small enough to embed the entire chip inside the TPU. One recomendation is that you do not solder the MOSFETs to the board, using the Terminal Blocks like Ronote did is an excellent thought. That way, if you burn one up, it'll be easy to replace.

Here's the link to the MIC4426 Datasheet:

http://www.ortodoxism.ro/datasheets/Micrel/mXsvxzr.pdf

I managed to get a couple of these chips from an Engineer at work so I'll be ready to roll soon .

God Bless,
Jason O

Yes, please. 

[Jdo300]

Hi Ronotte,

Another question. What did you use to power the ICs on your board? Did you use the same power supply that ran the FETs or did you use something separate?

God Bless,
Jason O

[CTG Labs]

Hi Jason,

I think he uses a 4027 JK.


Dave.