High output 4066?

[simon]

Anyone help please?

I'm after a solid state IC (like the 4066 transition gate) whereby I can
use a microcontroller output to switch a higher voltage output say, up
to 20v DC, bi-directionally, and is able to pass up to 200mA.

Does such a product exist? Solid state relays are a little too expensive
for my application.

Any advice would be appreciated.

Simon

 

[Rich Grise]

On Fri, 26 Nov 2004 12:18:41 +0000, simon wrote:

Anyone help please?

I'm after a solid state IC (like the 4066 transition gate) whereby I can
use a microcontroller output to switch a higher voltage output say, up
to 20v DC, bi-directionally, and is able to pass up to 200mA.

Does such a product exist? Solid state relays are a little too expensive
for my application.

Any advice would be appreciated.

Is an ordinary reed relay out of the question?

Thanks,
Rich

 

[Winfield Hill]

simon wrote...

I'm after a solid state IC (like the 4066 transition gate) whereby
I can use a microcontroller output to switch a higher voltage output
say, up to 20v DC, bi-directionally, and is able to pass up to 200mA.

Does such a product exist? Solid state relays are a little too
expensive for my application.

You can easily roll you own using a pair of small complementary
20V to 60V MOSFETs. Presumably you're using other '4000 series
CMOS gates already? If you're using a 20V logic supply, simply
add an inverter to get the gate signals for your N- and P-channel
pair. If you're using +/-10V supplies, and need complementary
+/-10V logic swings for the MOSFET gates, use two '4053 switches
on the rails - the '4053 has convenient built-in level-shifters.

If you need advice for small complementary MOSFETs, get back to
us, but with some of your other constraints spelled out, such as
do you prefer SMT packages? Etc.


--
Thanks,
- Win

 

[Ken Smith]

In article <4d8fq01phfs4r2bslvgeiv8mvbmfccu4s4@4ax.com>,
Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote:
[...]

How would you connect regular discrete MOSFETs with no access to the
substrates or body diodes?

+drive
-----------
! !
----- -----
- - - - - - N chan
! ! !s s! ! !
! -------- !
! !
--------+ +----------
! !
! -------- !
! ! !s s! ! !
- - - - - - P chan
----- -----
! !
-----------



You could use just a pair of N-channel devices and one of the photovoltaic
opto-isolators.

--
--
kensmith@rahul.net forging knowledge

 

[Jim Thompson]

On Fri, 26 Nov 2004 22:40:46 +0000 (UTC), kensmith@green.rahul.net
(Ken Smith) wrote:

In article <4d8fq01phfs4r2bslvgeiv8mvbmfccu4s4@4ax.com>,
Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote:
[...]
How would you connect regular discrete MOSFETs with no access to the
substrates or body diodes?

+drive
-----------
! !
----- -----
- - - - - - N chan
! ! !s s! ! !
! -------- !
! !
--------+ +----------
! !
! -------- !
! ! !s s! ! !
- - - - - - P chan
----- -----
! !
-----------



You could use just a pair of N-channel devices and one of the photovoltaic
opto-isolators.

--

If you have gate drive well in excess of signal you only need one sex.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Pooh Bear]

simon wrote:

Anyone help please?

I'm after a solid state IC (like the 4066 transition gate) whereby I can
use a microcontroller output to switch a higher voltage output say, up
to 20v DC, bi-directionally, and is able to pass up to 200mA.

Does such a product exist? Solid state relays are a little too expensive
for my application.

200 mA ?

Even discrete jfet's will have trouble there. You might get Ron down to
about 10 ohms. I suppose you could parallel some devices. More complicated
drive with jfets though. You would need a highish voltage to turn them off.

What are you switching ?

Does it need to have a linear 'resistor like' characteristic ?


Graham

 

[Rolavine]

Subject: Re: High output 4066?
From: Pooh Bear rabbitsfriendsandrelations@hotmail.com
Date: 11/26/04 5:21 PM Pacific Standard Time

Anyone help please?

I'm after a solid state IC (like the 4066 transition gate) whereby I can
use a microcontroller output to switch a higher voltage output say, up
to 20v DC, bi-directionally, and is able to pass up to 200mA.

Does such a product exist? Solid state relays are a little too expensive
for my application.

200 mA ?

Even discrete jfet's will have trouble there. You might get Ron down to
about 10 ohms. I suppose you could parallel some devices. More complicated
drive with jfets though. You would need a highish voltage to turn them off.

What are you switching ?

Does it need to have a linear 'resistor like' characteristic ?

Check out Supertex at the obvious dot com, their HV20220 or other switch

products may be just what you need.

Good Luck!

Rocky

 

[Winfield Hill]

Spehro Pefhany wrote...

Or even a 10-cent MAC97A4 and a resistor, if you want to be like that.

Awkk!


--
Thanks,
- Win

 

[simon]

Thanks to all in this thread. I'm still weighing up suggestions but it
looks like I'll settle for a solid state relay after all.

Cheers,
Simon