Driver chip...
Archiver
Posts: 46,084
Greetings!
I'm working on a low-power/low-voltage project using a BS1, and need a
H-bridge or just a driver with totempole output stage that can sink/source
50 - 100mA and operate at 3V...
Anyone know of such a chip?
:-)
Trygve
I'm working on a low-power/low-voltage project using a BS1, and need a
H-bridge or just a driver with totempole output stage that can sink/source
50 - 100mA and operate at 3V...
Anyone know of such a chip?
:-)
Trygve
Comments
>
> I'm working on a low-power/low-voltage project using a BS1, and need a
> H-bridge or just a driver with totempole output stage that can sink/source
> 50 - 100mA and operate at 3V...
>
> Anyone know of such a chip?
I was going to say the L293D would be perfect -until I saw the 3 volt
part.
Most semiconductors designed for 3 volt systems are going to be
difficult to get in small quantities and will almost certainly be
surface mount parts.
You may find making your own from discrete components a
practical alternative in this case.
Mark Hillier, VE6HVW
President, HVW Technologies Inc.
Canadian Distributors of Parallax Products and other Neat Stuff
Tel: (403)-730-8603 Fax: (403)-730-8903
http://www.HVWTech.com
** New Breadboard Voltage Regulator (BVR) -A plugable +5 Volt
power supply !
microstepping bipolar driver that runs at 3.0v to 5.5v logic supply
voltage. It's supplied in a 24-pin surface mount package.
Dennis
Original Message
From: Trygve Henriksen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Y4tz_esw6_OYxe9Wmhqpf4-uQjVAooDlX-w5EHvERUm1x7iJO1W78P--jX4WXdhsNG1o9cmZiYEtGCPikiOlP26Xaii7ZpA]trygve.henriksen@v...[/url
Sent: Thursday, March 06, 2003 11:26 PM
To: 'basicstamps@yahoogroups.com'
Subject: SV: [noparse][[/noparse]basicstamps] Driver chip...
Greetings!
So, there's no CMOS buffer/line driver chip that can deliver the power
needed, then?
*Sigh*
Seems like I have to double the size of the battery pack...
A pity for the BS1 runs very nicely at 3V.
:-)
Trygve
Opprinnelig melding
Fra: Mark Hillier [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=xK_m8gKkRCo__SnpqEPAmQte_28BlezpnHXy3RGOpHkf7JT6LnzYcBo_X-iOUiLVLupNZGAo]Mark@H...[/url
Sendt: 6. mars 2003 18:01
Til: basicstamps@yahoogroups.com
Emne: Re: [noparse][[/noparse]basicstamps] Driver chip...
> Greetings!
>
> I'm working on a low-power/low-voltage project using a BS1, and need a
> H-bridge or just a driver with totempole output stage that can
> sink/source 50 - 100mA and operate at 3V...
>
> Anyone know of such a chip?
I was going to say the L293D would be perfect -until I saw the 3 volt
part.
Most semiconductors designed for 3 volt systems are going to be
difficult to get in small quantities and will almost certainly be
surface mount parts.
You may find making your own from discrete components a
practical alternative in this case.
Mark Hillier, VE6HVW
President, HVW Technologies Inc.
Canadian Distributors of Parallax Products and other Neat Stuff
Tel: (403)-730-8603 Fax: (403)-730-8903
http://www.HVWTech.com
** New Breadboard Voltage Regulator (BVR) -A plugable +5 Volt
power supply !
To UNSUBSCRIBE, just send mail to:
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run off of 3 V, and you could build your own totem pole possibly.
Original Message
From: Trygve Henriksen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=AcHnryUoxYmuCfKmA4QF9rXKq5PCcIpJg-zP4Lj9--DlpU39aengw3uzJJfOdxuAXZj_cbTn0usBtdxycFRwrA9t1g]trygve.henriksen@v...[/url
Sent: Friday, March 07, 2003 2:26 AM
To: 'basicstamps@yahoogroups.com'
Subject: SV: [noparse][[/noparse]basicstamps] Driver chip...
Greetings!
So, there's no CMOS buffer/line driver chip that can deliver the power
needed, then?
*Sigh*
Seems like I have to double the size of the battery pack...
A pity for the BS1 runs very nicely at 3V.
:-)
Trygve
Opprinnelig melding
Fra: Mark Hillier [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=SICf4YHD8qu6nCNdfl2w3WYzJRflerksLX64bNHcxxcaEmKyO13drOxYs9BdpyYG_Ov_UZF0Bt7h]Mark@H...[/url
Sendt: 6. mars 2003 18:01
Til: basicstamps@yahoogroups.com
Emne: Re: [noparse][[/noparse]basicstamps] Driver chip...
> Greetings!
>
> I'm working on a low-power/low-voltage project using a BS1, and need a
> H-bridge or just a driver with totempole output stage that can
> sink/source 50 - 100mA and operate at 3V...
>
> Anyone know of such a chip?
I was going to say the L293D would be perfect -until I saw the 3 volt
part.
Most semiconductors designed for 3 volt systems are going to be
difficult to get in small quantities and will almost certainly be
surface mount parts.
You may find making your own from discrete components a
practical alternative in this case.
Mark Hillier, VE6HVW
President, HVW Technologies Inc.
Canadian Distributors of Parallax Products and other Neat Stuff
Tel: (403)-730-8603 Fax: (403)-730-8903
http://www.HVWTech.com
** New Breadboard Voltage Regulator (BVR) -A plugable +5 Volt
power supply !
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject
and Body of the message will be ignored.
Your use of Yahoo! Groups is subject to
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ZETEX ZHB6718 bipolar h bridge IC
ZETEX ZHB6790 bipolar H bridge IC
ZTX550 PNP
ZTX704 PNP
ZTX650 NPN
Here in the USA you can get them via www.digikey.com
www.didel.com also talks about using some European low voltage transistors
that I can't get
here in the USA. This is in the articles where they discuss how to program
MCU's to drive Switek brushless gear motors.
I have successfully run the ZHB6718 with 280 size cheap motors at 2.4 volts
(two NMH AA battery cells).
3 volts isn't a problem.
As a matter of fact I have a robot I'll be running at next week's
www.dprg.org Tabletop Robotics Competition, that is using that hbridge
circuit with two NMH battery cells for the motors.
The MCU brain is running off a 1.2v NMH cell (nice trick huh?). [noparse]:)[/noparse]
I used a cell phone DC-DC converter IC for this.
Original Message
From: Trygve Henriksen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=nm6__1dRHQ2lbHAXitGR-JGy0YPWIkaNQM0GDjtD1ca-rlJtHUHuJ8BEETIUHnap7-geWNNS9ucMJRmFmG4qCBe2b2qK]trygve.henriksen@v...[/url
Sent: Saturday, March 08, 2003 7:06 AM
To: 'basicstamps@yahoogroups.com'
Subject: SV: [noparse][[/noparse]basicstamps] Driver chip...
greetings!
Yes, that chip would be overkill...
I need to control two small DC motors; they're those vibrator types used in
pagers and cell-phones...
first I tried to connect one directly to two of the IO pins of the BS1 and
use that as a H-bridge...
By pulling one pin low and the other high, the motor ran in one direction,
and inverting the levels made it run the other way...
But...
That was when the motor was entirely without load.
As soon as I mounted anything on the driveshaft it drew too much power for
the BS1.
I really don't want to go to 5V because I'm trying to make the design as
small as possible, and intend to use a 3V 'button' type cell. (Won't give me
more than 15 - 30 minutes running time, but that's all that's needed :-)
What I'm making?
A 'MilliBot'...
Microbots are associated with those Transformers things and probably
trademarked)
Nanobots are sooooo overhyped...
(I'll put up a section on my website as soon as I get something to work)
Oh well, I'll check the Solarbotics site and see what they have of designs
and drivers.
:-)
Trygve
Opprinnelig melding
Fra: Dennis P. O'Leary [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=2vnh3mDJ8Xigop42SW2NQSWbi9RQbajuG4_dBc6426qcELY3eYLdMqOtvq2uOMnm0-mjmS8OqUADounPg7s]doleary@e...[/url
Sendt: 7. mars 2003 19:58
Til: basicstamps@yahoogroups.com
Emne: RE: [noparse][[/noparse]basicstamps] Driver chip...
It may be overkill for your application, but the Allegro 3967 is a
microstepping bipolar driver that runs at 3.0v to 5.5v logic supply
voltage. It's supplied in a 24-pin surface mount package.
Dennis
Original Message
From: Trygve Henriksen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=nm6__1dRHQ2lbHAXitGR-JGy0YPWIkaNQM0GDjtD1ca-rlJtHUHuJ8BEETIUHnap7-geWNNS9ucMJRmFmG4qCBe2b2qK]trygve.henriksen@v...[/url
Sent: Thursday, March 06, 2003 11:26 PM
To: 'basicstamps@yahoogroups.com'
Subject: SV: [noparse][[/noparse]basicstamps] Driver chip...
Greetings!
So, there's no CMOS buffer/line driver chip that can deliver the power
needed, then?
*Sigh*
Seems like I have to double the size of the battery pack...
A pity for the BS1 runs very nicely at 3V.
:-)
Trygve
Opprinnelig melding
Fra: Mark Hillier [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=kPQcqYaqdKadVb601r2prvXSUul0M4J8ssiBVukssfCKIxJcthNnXkHnCN875EL2bvpBIvIsFd4]Mark@H...[/url
Sendt: 6. mars 2003 18:01
Til: basicstamps@yahoogroups.com
Emne: Re: [noparse][[/noparse]basicstamps] Driver chip...
> Greetings!
>
> I'm working on a low-power/low-voltage project using a BS1, and need a
> H-bridge or just a driver with totempole output stage that can
> sink/source 50 - 100mA and operate at 3V...
>
> Anyone know of such a chip?
I was going to say the L293D would be perfect -until I saw the 3 volt
part.
Most semiconductors designed for 3 volt systems are going to be
difficult to get in small quantities and will almost certainly be
surface mount parts.
You may find making your own from discrete components a
practical alternative in this case.
Mark Hillier, VE6HVW
President, HVW Technologies Inc.
Canadian Distributors of Parallax Products and other Neat Stuff
Tel: (403)-730-8603 Fax: (403)-730-8903
http://www.HVWTech.com
** New Breadboard Voltage Regulator (BVR) -A plugable +5 Volt
power supply !
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject
and Body of the message will be ignored.
Your use of Yahoo! Groups is subject to
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The Zetex parts look like a good bet and could be driven right from a
pair of Stamp outputs with resistors in series with B1+B2 and B3+B4.
Zetex makes great superbeta transistors, and these in the ZHB6718
have gains of around 400, and the saturation collector voltages are
in the 10s of millivolt range. Most other h-bridge drivers have
darlington transistors outputs, but those are not at all suitable for
3 volt systems because of the 0.7 volt saturation voltage for each
transistor.
If you don't want to get the Zetex part, just look at its simple
circuit. You could get the same result with 4 PNP+ 2 NPN transistors
for your relatively small current requirements. The Zetex superbeta
transistors again would give the best performance at the lowest drive
current, but it would work even with 2n3904/2n3906.
Bipolar transistors are best for the 3v application. To use discrete
Mosfets at the low voltages, you would have to get special
low-threshold parts (Vgs-threshold<1 volt), for example, the Supertex
LP0701/TN0702 will turn on fully for 100 milliamps at 3 volts and are
available in TO92 packages.
-- Tracy
>These should give you ideas.
>ZETEX ZHB6718 bipolar h bridge IC
>ZETEX ZHB6790 bipolar H bridge IC
>ZTX550 PNP
>ZTX704 PNP
>ZTX650 NPN
>Here in the USA you can get them via www.digikey.com
>
>www.didel.com also talks about using some European low voltage transistors
>that I can't get
>here in the USA. This is in the articles where they discuss how to program
>MCU's to drive Switek brushless gear motors.
>
>I have successfully run the ZHB6718 with 280 size cheap motors at 2.4 volts
>(two NMH AA battery cells).
>3 volts isn't a problem.
>As a matter of fact I have a robot I'll be running at next week's
>www.dprg.org Tabletop Robotics Competition, that is using that hbridge
>circuit with two NMH battery cells for the motors.
>The MCU brain is running off a 1.2v NMH cell (nice trick huh?). [noparse]:)[/noparse]
>I used a cell phone DC-DC converter IC for this.
>
>
>
Original Message
>From: Trygve Henriksen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=s6JppswL7tn9KjGVAosazqnQN2CJNLqyowO25zQ4anycNzqvEHZi0Bz08JRZICkDM8yuz3szBJQpiDAbYWlchsTKTjtx4qM]trygve.henriksen@v...[/url
>Sent: Saturday, March 08, 2003 7:06 AM
>To: 'basicstamps@yahoogroups.com'
>Subject: SV: [noparse][[/noparse]basicstamps] Driver chip...
>
>
>greetings!
>
>Yes, that chip would be overkill...
>
>I need to control two small DC motors; they're those vibrator types used in
>pagers and cell-phones...
>
>first I tried to connect one directly to two of the IO pins of the BS1 and
>use that as a H-bridge...
>By pulling one pin low and the other high, the motor ran in one direction,
>and inverting the levels made it run the other way...
>
>But...
>That was when the motor was entirely without load.
>As soon as I mounted anything on the driveshaft it drew too much power for
>the BS1.
>
>I really don't want to go to 5V because I'm trying to make the design as
>small as possible, and intend to use a 3V 'button' type cell. (Won't give me
>more than 15 - 30 minutes running time, but that's all that's needed :-)
>
>What I'm making?
>A 'MilliBot'...
>Microbots are associated with those Transformers things and probably
>trademarked)
>Nanobots are sooooo overhyped...
>(I'll put up a section on my website as soon as I get something to work)
>
>Oh well, I'll check the Solarbotics site and see what they have of designs
>and drivers.
>
>:-)
>Trygve
>
>
> > Greetings!
> >
> > I'm working on a low-power/low-voltage project using a BS1, and need a
>
> > H-bridge or just a driver with totempole output stage that can
> > sink/source 50 - 100mA and operate at 3V...
> >
> > Anyone know of such a chip?