Circuit Advice Needed

J

Jim Thompson

Guest
Please suggest circuitry and power MOSFETs to do the following:

Control voltage > +100mV, turn on P-channel device to +24V (1 Amp *)

Control voltage < -100mV, turn on N-channel device to -24V (1 Amp *)

-100mV <= Control voltage <= +100mV, both MOSFETS OFF.

Speed required <= 1uS (Voltage *)

Thanks!

(*) Load is 20ohm in series with 2.5mH

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Harry Dellamano wrote:

Winner may bring a
Hibachi if your outdoor grill is too small for four people.

Jim grills _people_? I knew he's got a rep as a conservative, but this
Click to expand...
is way beyond "conservative"!

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
Jim Thompson <thegreatone@example.com> wrote:

Please suggest circuitry and power MOSFETs to do the following:

Control voltage > +100mV, turn on P-channel device to +24V (1 Amp *)

Control voltage < -100mV, turn on N-channel device to -24V (1 Amp *)

-100mV <= Control voltage <= +100mV, both MOSFETS OFF.

Speed required <= 1uS (Voltage *)
Click to expand...

+24v
-----------o----------------.
| |
.-. |
| |1k |
| | |
'-' |
| |
36k_ o-------------||-+
---|___|----o ||->
3k9_ | | ||-+
-|___|-o-o-o--. z 10v |
| | | | A |
=== | V - | |
GND | - ^ | |
IN ___ | | | || |
-----|___|------)---o--o-----|+\ |
56k | | >--o---o--- | OUT
| .----------|-/ | | | o-----
| | || | V - |
10k | | 56k | | - ^ |
-|___|-)-o--|___|----|----| |--| |
| | | | |
=== | z === |
GND | A10v GND |
| | |
| 36k_ | ||-+
'----|___|----o ||<-
o-------------||-+
| |
.-. |
| |1k |
| | |
'-' |
-24v | |
-----------o-----------------
(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)

? Needs a fast low power amp like a TLE2081 maybe and probably a little +ve
feedback around the amp for hysteresis.

I anyone tries simulating this don't expect any sense unless the opamp
model accurately models supply currents.
 
Jim,

Winner may bring a
Hibachi if your outdoor grill is too small for four people.

Jim grills _people_? I knew he's got a rep as a conservative,
but this is way beyond "conservative"!

I have a 4-burner grill, plus a smoker big enough to handle a
human, whole ;-)
Click to expand...
I'm not worried until you say you're having a walk-in microwave
oven installed.

--Mike
 
On Mon, 29 Nov 2004 21:35:18 GMT, Mike Engelhardt wrote:

Jim,

Winner may bring a
Hibachi if your outdoor grill is too small for four people.

Jim grills _people_? I knew he's got a rep as a conservative,
but this is way beyond "conservative"!

I have a 4-burner grill, plus a smoker big enough to handle a
human, whole ;-)

I'm not worried until you say you're having a walk-in microwave
oven installed.
Click to expand...
Why? Then we could cook both Dr. Slick and lemonjuice real quick
like.
--
Best Regards,
Mike
 
On Mon, 29 Nov 2004 20:39:51 +0000, nospam wrote:
I anyone tries simulating this don't expect any sense unless the opamp
model accurately models supply currents.
Click to expand...
Can anyone tell us how to check the model to find out?

What manufacturers' models are known to do this?
--
Best Regards,
Mike
 
In article <4d15e4705dtonyw@ledelec.demon.co.uk>,
Tony Williams <tonyw@ledelec.demon.co.uk> wrote:

+----------------+-------+-- +24v
| | |
[330R] | |
| |/e |
+--------------|pnp |
| |\ |
_| | |--+
+------|- \ +---||p-type
| | >----+---+ | |--+
Click to expand...

Clamping Vgs to 12v max would be a nice touch.........

--
Tony Williams.
 
In article <1nperdi03eiul.dlg@news.individual.net>,
Active8 <reply2group@ndbbm.net> wrote:

Can anyone tell us how to check the model to find out?

What manufacturers' models are known to do this?
Click to expand...
See the thread "TL081/Tl084 Model that actively models
Power Supply Cuurent ?", in s.e.d.

Mike Englehardt posted some interesting information.

--
Tony Williams.
 
On Tue, 30 Nov 2004 13:51:08 +0000 (GMT), Tony Williams wrote:

In article <1nperdi03eiul.dlg@news.individual.net>,
Active8 <reply2group@ndbbm.net> wrote:

Can anyone tell us how to check the model to find out?

What manufacturers' models are known to do this?

See the thread "TL081/Tl084 Model that actively models
Power Supply Cuurent ?", in s.e.d.

Mike Englehardt posted some interesting information.
Click to expand...
Crap. I saw that before anyone replied and blew right on by later.
Thanks.
--
Best Regards,
Mike
 
In article <1Fard.5752$Hk6.5086@trnddc05>,
HARRY DELLAMANO <harry_td@verizon.net> wrote:

I posted my circuit in ABSE and included Vgs independent of
power rails. I also used two op-amps or comparators but in a
different configuration such that I can easily control slewing
speeds with no power resistors.

Spank me with your keyboards,
Click to expand...
:)

I'm not subscribed to abse atm Harry, but spank away.

--
Tony Williams.
 
"Fred Bloggs" <nospam@nospam.com> wrote in message
news:41ADDB63.5010901@nospam.com...
I posted my circuit in ABSE and included Vgs independent of power rails.
I also used two op-amps or comparators but in a different configuration
such that I can easily control slewing speeds with no power resistors.

Spank me with your keyboards,
Harry

It looks like you risk avalanching the EB junctions of your Q3/Q4
transistors at turn-off- the idea is basically good though.
Click to expand...
Hey Fred,
Not sure of what you speak. The EB junctions on Q3,4 get back biased 4.3V
for 10us then 0VDC continuously. Is this a problem?

Harry
 
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