Re: PWM [or ANY OTHER] chip that can drive an H bridge?

On Fri, 07 Oct 2005 19:47:16 GMT, Ignoramus30105
<ignoramus30105@xxxxxxxxxxxxxxxxxxxx> wrote:

>On Fri, 07 Oct 2005 18:48:15 GMT, Ignoramus30105 <ignoramus30105@xxxxxxxxxxxxxxxxxxxx> wrote:
>> Gentlemen, I greatly appreciate your help. You helped me with so many
>> decisions already. I would not be where I am without it. However, I am
>> somewhat confused by something.
>>
>> I am not really asking for very much. I cannot believe that I have to
>> go to great lengths or create esoteric solutions. I suspect (and hope)
>> that we are missing something simple.
>>
>> Let me make it very clear as to what I want.
>>
>> I want a IC chip that has the following characteristics:
>>
>> 1. Generates pulsed, square wave, preferably at 5V above ground
>> alternating with ground.
>>
>> 2. Can have its frequency controlled by a separate pot and able to
>> function around 30-1000 Hz
>>
>> 3. Can have its "duty cycle" (percentage of time it spends in the HIGH
>> section) controlled by another, separate pot.
>>
>> 4. Preferably use about 18VDC power.
>>
>> 5. Preferably is a DIP.
>>
>> It may be called PWM or something else. Let's not get stuck on
>> designation here. What matters is that it does what I want.
>>
>> Is it really true that such chips are nonexistent?
>>
>> MAX038 does almost what I want, but it is a little expensive, requires
>> a different power supply compared to the gate driver and also
>> amplification of its output. Otherwise it is great.
>
>I think that I finally found what I am looking for.
>
>XR2206
>
> http://www.exar.com/product.php?ProdNumber=XR2206&areaID=7
>
>$3.59 at Jameco. It fits the bill perfectly.
>
>i

I was going to suggest an LM339 circuit but, if you're happy, I'm
happy ;-)

...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.
.

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