• alternative of LTC6992?

    From Piyush Kamdi@21:1/5 to All on Tue Jul 19 04:37:49 2022
    can anyone tell me the alternative of the IC LTC6992

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to piyushkamdi21@gmail.com on Tue Jul 19 05:23:31 2022
    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to jlarkin@highlandsniptechnology.com on Tue Jul 19 09:05:07 2022
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Anthony William Sloman@21:1/5 to piyush...@gmail.com on Tue Jul 19 06:12:16 2022
    On Tuesday, July 19, 2022 at 9:37:53 PM UTC+10, piyush...@gmail.com wrote:
    can anyone tell me the alternative of the IC LTC6992

    Single chip microcontrollers can do the same job. You need an internal clock that runs faster than 1MHz to get the same frequency range, but some run up to 100MHz and faster (though they tend to be bit greedy with supply current).

    --
    Bill Sloman, Sydney

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jlarkin@highlandsniptechnology.com@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Tue Jul 19 07:54:32 2022
    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Mike Monett@21:1/5 to Piyush Kamdi on Tue Jul 19 14:17:10 2022
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to jlarkin@highlandsniptechnology.com on Tue Jul 19 14:26:01 2022
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Tue Jul 19 13:33:48 2022
    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!

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to John Larkin on Tue Jul 19 17:20:43 2022
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Tue Jul 19 15:51:29 2022
    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.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)