can anyone tell me the alternative of the IC LTC6992

On Tue, 19 Jul 2022 04:37:49 -0700 (PDT), Piyush Kamdi
<piyushkamdi21@gmail.com> wrote:

>can anyone tell me the alternative of the IC LTC6992

You could make something out of cheap parts... depends on your exact
needs.

jlarkin@highlandsniptechnology.com wrote:
> On Tue, 19 Jul 2022 04:37:49 -0700 (PDT), Piyush Kamdi
> <piyushkamdi21@gmail.com> wrote:
>
>> can anyone tell me the alternative of the IC LTC6992

Yikes! $5 in onesies, $3 in reels for a glorified RC monostable?

> You could make something out of cheap parts... depends on your exact
> needs.

Such as an NE556D dual timer, with one side being an astable and the
other side a monostable with a variable threshold. Ten cents in any
quantity, direct from TI.

<https://www.ti.com/product/NE556/part-details/NE556DR>

A bit more design is required, of course--you have to take account of
the tolerances of the chip and timing components, especially if you want
to get duty cycles near 0.

OTOH if the OP uses a resistor to a higher supply rail (and a diode to
V+ for protection), the ramp will linearize pretty well. Extra points
for using a BJT current source. ;)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Piyush Kamdi <piyushkamdi21@gmail.com> wrote:

> can anyone tell me the alternative of the IC LTC6992

Depends on what you want to do. Check Octopart:

https://octopart.com/search?q=Voltage-Controlled+Pulse+Width+Modulator

--
MRM

On Tue, 19 Jul 2022 09:05:07 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>jlarkin@highlandsniptechnology.com wrote:
>> On Tue, 19 Jul 2022 04:37:49 -0700 (PDT), Piyush Kamdi
>> <piyushkamdi21@gmail.com> wrote:
>>
>>> can anyone tell me the alternative of the IC LTC6992
>
>Yikes! $5 in onesies, $3 in reels for a glorified RC monostable?
>
>> You could make something out of cheap parts... depends on your exact
>> needs.
>
>Such as an NE556D dual timer, with one side being an astable and the
>other side a monostable with a variable threshold. Ten cents in any
>quantity, direct from TI.
>
><https://www.ti.com/product/NE556/part-details/NE556DR>
>
>A bit more design is required, of course--you have to take account of
>the tolerances of the chip and timing components, especially if you want
>to get duty cycles near 0.
>
>OTOH if the OP uses a resistor to a higher supply rail (and a diode to
>V+ for protection), the ramp will linearize pretty well. Extra points
>for using a BJT current source. ;)
>
>Cheers
>
>Phil Hobbs

About the simplest voltage to duty cycle converter is a schmitt gate
oscillator and one added resistor. Real cheapskates can delete the
cap.

Fancier, use a dial opamp or comparator as a triangle oscillator +
comparator.

If Piyush can give us some details of the requirements, we could
design something with him. Group design is fun.

jlarkin@highlandsniptechnology.com wrote:
> On Tue, 19 Jul 2022 09:05:07 -0400, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> jlarkin@highlandsniptechnology.com wrote:
>>> On Tue, 19 Jul 2022 04:37:49 -0700 (PDT), Piyush Kamdi
>>> <piyushkamdi21@gmail.com> wrote:
>>>
>>>> can anyone tell me the alternative of the IC LTC6992
>>
>> Yikes! $5 in onesies, $3 in reels for a glorified RC monostable?
>>
>>> You could make something out of cheap parts... depends on your exact
>>> needs.
>>
>> Such as an NE556D dual timer, with one side being an astable and the
>> other side a monostable with a variable threshold. Ten cents in any
>> quantity, direct from TI.
>>
>> <https://www.ti.com/product/NE556/part-details/NE556DR>
>>
>> A bit more design is required, of course--you have to take account of
>> the tolerances of the chip and timing components, especially if you want
>> to get duty cycles near 0.
>>
>> OTOH if the OP uses a resistor to a higher supply rail (and a diode to
>> V+ for protection), the ramp will linearize pretty well. Extra points
>> for using a BJT current source. ;)
>>
>> Cheers
>>
>> Phil Hobbs
>
> About the simplest voltage to duty cycle converter is a schmitt gate
> oscillator and one added resistor. Real cheapskates can delete the
> cap.
>
> Fancier, use a dial opamp or comparator as a triangle oscillator +
> comparator.
>
> If Piyush can give us some details of the requirements, we could
> design something with him. Group design is fun.

Yeah, if the rep rate doesn't need to be constant you can do without a
lot of stuff. Simplifies the tolerances too.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

On Tue, 19 Jul 2022 14:26:01 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>jlarkin@highlandsniptechnology.com wrote:
>> On Tue, 19 Jul 2022 09:05:07 -0400, Phil Hobbs
>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>
>>> jlarkin@highlandsniptechnology.com wrote:
>>>> On Tue, 19 Jul 2022 04:37:49 -0700 (PDT), Piyush Kamdi
>>>> <piyushkamdi21@gmail.com> wrote:
>>>>
>>>>> can anyone tell me the alternative of the IC LTC6992
>>>
>>> Yikes! $5 in onesies, $3 in reels for a glorified RC monostable?
>>>
>>>> You could make something out of cheap parts... depends on your exact
>>>> needs.
>>>
>>> Such as an NE556D dual timer, with one side being an astable and the
>>> other side a monostable with a variable threshold. Ten cents in any
>>> quantity, direct from TI.
>>>
>>> <https://www.ti.com/product/NE556/part-details/NE556DR>
>>>
>>> A bit more design is required, of course--you have to take account of
>>> the tolerances of the chip and timing components, especially if you want
>>> to get duty cycles near 0.
>>>
>>> OTOH if the OP uses a resistor to a higher supply rail (and a diode to
>>> V+ for protection), the ramp will linearize pretty well. Extra points
>>> for using a BJT current source. ;)
>>>
>>> Cheers
>>>
>>> Phil Hobbs
>>
>> About the simplest voltage to duty cycle converter is a schmitt gate
>> oscillator and one added resistor. Real cheapskates can delete the
>> cap.
>>
>> Fancier, use a dial opamp or comparator as a triangle oscillator +
>> comparator.
>>
>> If Piyush can give us some details of the requirements, we could
>> design something with him. Group design is fun.
>
>Yeah, if the rep rate doesn't need to be constant you can do without a
>lot of stuff. Simplifies the tolerances too.
>
>Cheers
>
>Phil Hobbs

Schmitt gate inverter, one resistor, one thermistor. It's a PWM
temperature controller!

John Larkin wrote:
> On Tue, 19 Jul 2022 14:26:01 -0400, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> jlarkin@highlandsniptechnology.com wrote:
>>> On Tue, 19 Jul 2022 09:05:07 -0400, Phil Hobbs
>>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>>
>>>> jlarkin@highlandsniptechnology.com wrote:
>>>>> On Tue, 19 Jul 2022 04:37:49 -0700 (PDT), Piyush Kamdi
>>>>> <piyushkamdi21@gmail.com> wrote:
>>>>>
>>>>>> can anyone tell me the alternative of the IC LTC6992
>>>>
>>>> Yikes! $5 in onesies, $3 in reels for a glorified RC monostable?
>>>>
>>>>> You could make something out of cheap parts... depends on your exact
>>>>> needs.
>>>>
>>>> Such as an NE556D dual timer, with one side being an astable and the
>>>> other side a monostable with a variable threshold. Ten cents in any
>>>> quantity, direct from TI.
>>>>
>>>> <https://www.ti.com/product/NE556/part-details/NE556DR>
>>>>
>>>> A bit more design is required, of course--you have to take account of
>>>> the tolerances of the chip and timing components, especially if you want
>>>> to get duty cycles near 0.
>>>>
>>>> OTOH if the OP uses a resistor to a higher supply rail (and a diode to
>>>> V+ for protection), the ramp will linearize pretty well. Extra points
>>>> for using a BJT current source. ;)
>>>>
>>>> Cheers
>>>>
>>>> Phil Hobbs
>>>
>>> About the simplest voltage to duty cycle converter is a schmitt gate
>>> oscillator and one added resistor. Real cheapskates can delete the
>>> cap.
>>>
>>> Fancier, use a dial opamp or comparator as a triangle oscillator +
>>> comparator.
>>>
>>> If Piyush can give us some details of the requirements, we could
>>> design something with him. Group design is fun.
>>
>> Yeah, if the rep rate doesn't need to be constant you can do without a
>> lot of stuff. Simplifies the tolerances too.

>
> Schmitt gate inverter, one resistor, one thermistor. It's a PWM
> temperature controller!
>

For sufficiently permissive definitions of 'controller'. ;0

(It would be fairly challenging without at least one other resistor for
heating, unless you're just trying to control the temperature of the
thermistor.)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

On Tue, 19 Jul 2022 17:20:43 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>John Larkin wrote:
>> On Tue, 19 Jul 2022 14:26:01 -0400, Phil Hobbs
>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>
>>> jlarkin@highlandsniptechnology.com wrote:
>>>> On Tue, 19 Jul 2022 09:05:07 -0400, Phil Hobbs
>>>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>>>
>>>>> jlarkin@highlandsniptechnology.com wrote:
>>>>>> On Tue, 19 Jul 2022 04:37:49 -0700 (PDT), Piyush Kamdi
>>>>>> <piyushkamdi21@gmail.com> wrote:
>>>>>>
>>>>>>> can anyone tell me the alternative of the IC LTC6992
>>>>>
>>>>> Yikes! $5 in onesies, $3 in reels for a glorified RC monostable?
>>>>>
>>>>>> You could make something out of cheap parts... depends on your exact
>>>>>> needs.
>>>>>
>>>>> Such as an NE556D dual timer, with one side being an astable and the
>>>>> other side a monostable with a variable threshold. Ten cents in any
>>>>> quantity, direct from TI.
>>>>>
>>>>> <https://www.ti.com/product/NE556/part-details/NE556DR>
>>>>>
>>>>> A bit more design is required, of course--you have to take account of
>>>>> the tolerances of the chip and timing components, especially if you want
>>>>> to get duty cycles near 0.
>>>>>
>>>>> OTOH if the OP uses a resistor to a higher supply rail (and a diode to
>>>>> V+ for protection), the ramp will linearize pretty well. Extra points
>>>>> for using a BJT current source. ;)
>>>>>
>>>>> Cheers
>>>>>
>>>>> Phil Hobbs
>>>>
>>>> About the simplest voltage to duty cycle converter is a schmitt gate
>>>> oscillator and one added resistor. Real cheapskates can delete the
>>>> cap.
>>>>
>>>> Fancier, use a dial opamp or comparator as a triangle oscillator +
>>>> comparator.
>>>>
>>>> If Piyush can give us some details of the requirements, we could
>>>> design something with him. Group design is fun.
>>>
>>> Yeah, if the rep rate doesn't need to be constant you can do without a
>>> lot of stuff. Simplifies the tolerances too.
>
>>
>> Schmitt gate inverter, one resistor, one thermistor. It's a PWM
>> temperature controller!
>>
>
>For sufficiently permissive definitions of 'controller'. ;0
>
>(It would be fairly challenging without at least one other resistor for
>heating, unless you're just trying to control the temperature of the
>thermistor.)
>
>Cheers
>
>Phil Hobbs

It would drive a mosfet or an SSR or something.