Switching from low to high voltage logic

[saint gillis]

I'm trying to convert a 0-5V signal to 0-12V .

- The 0-5V is a 33KHz PWM coming out from an MCU
- I want to control a 4066 switch with it

I tried to use a 40106 to convert it from 5 to 12V. But, maybe because of the speed , 5V is below the 40106 threshold, so it didn't work..
Then I tried to amplify it with fets or bipolar transistors, the speed was satisfying only when a lot of current goes through the transistor..
The best solution I found was to use an fast op amp (lm833, there are faster chips, I'll try them too), but it's still not perfectly following the signal.

Let's say I want my pwm to have a 1% resolution, it's still 0,3µs, so it's quite speed...

Any solutions, ideas?

 

[saint gillis]

Forgot to say that something that almost worked was to decouple the pulse with a capacitor and put a 4 or 5V offset at the input of the 40106.
Only problem is that when the duty cycle is 100%, the capacitor decoupling removes any DC, so 100% becomes equal to 0% ..

 

[saint gillis]

The CD4504 seems to be a possible solution

 

[Lampie519]

https://www.ti.com/lit/ds/symlink/c...=https%3A%2F%2Fwww.ti.com%2Fproduct%2FCD4050B
https://www.nxp.com/docs/en/supporting-information/High-Voltage-Logic-Family-QIC.pdf
https://assets.nexperia.com/documents/data-sheet/HEF4104B.pdf

 

[saint gillis]

Thanks, just to say that 4050/4049 didn't do the job either for this application

 

[Lampie519]

https://www.vishay.com/docs/84131/6n137a.pdf
Or a gate driver :

https://toshiba.semicon-storage.com/info/datasheet_en_20190617.pdf?did=16821

 

[AnalogPackrat]

MC14504B hex level shifter

 

[saint gillis]

MC14504B hex level shifter

Yes I've mentioned it, I'll try, it should do the job , thanks

 

[AnalogPackrat]

Yes I've mentioned it, I'll try, it should do the job , thanks

Missed that when I read through the thread...my bad.

 

[user 37518]

If you are using only a PWM square wave, why not use a comparator IC, you can control the swing levels and they should be faster than many op-amps.

Maybe you can find something here:

https://www.analog.com/en/parametricsearch/13007#/p2839=1.7|12

 

[saint gillis]

I've unsuccessfully tried several jellybean comparators, I had the best results when drawing a lot of current with their output transistor, it was still not great. I have the feeling that this CD4504B should do the job for a cheap price..

 

[madswitcher]

Off the top of my head, I would try a TTL to RS232C driver and put a diode on the output to catch it so as to stop it going more postive than 0.7V.

 

[saint gillis]

I've tried the CD4504, it works perfectly and seems unbeatable for half a euro..