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IRL 520 Driver — Parallax Forums

IRL 520 Driver

Photon ArtistPhoton Artist Posts: 18
edited 2004-08-30 16:36 in General Discussion
Thanks to all who provided info and help with my schematics for the IRL 520 Driver!!!

I have put together a driver board, designed with ExpressPCB.

Would someone mind taking a look at the board layout for any mistakes?

Also, the booard will be driving solenoids using 12 volts.· How do I figure out what value resistor to use to power my indivator leds from the same 12 volt supply line?

THanks again for the help.

Rus
pcb
pcb
IRL520 6 Solenoid Driver Board with LED indicators.pcb
15K

Comments

  • NewzedNewzed Posts: 2,503
    edited 2004-08-23 15:05
    Looks like your board is all wrong.

    Pin 1 of the VR is Input, Pin 2 is ground and Pin 3 is output.· That's for a start.

    Use a 12 volt LED with a 220 ohm resistor.

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    Sid Weaver
    Pluggable Serial Backpack

    http://hometown.aol.com/newzed/index.html
    ·
  • Photon ArtistPhoton Artist Posts: 18
    edited 2004-08-23 21:46
    Hey Sid,

    There are no VRs on the board.· The transistors are IRL520 Mosfets.· Pin1 is gate, Pin2 is drain, Pin3 is is Source.

    Rus
  • NewzedNewzed Posts: 2,503
    edited 2004-08-23 22:08
    Sorry about that.· If I double click on them the screen tells me it is a TO-220, 7805.

    Sid
  • Photon ArtistPhoton Artist Posts: 18
    edited 2004-08-23 22:28
    Newzed said...

    Sorry about that.· If I double click on them the screen tells me it is a TO-220, 7805.

    Sid

    No Biggie Sid.· The IRL520 wan't in the parts.· So I just used anything with a TO-220 Package.

    I really should go in and change that part number.

    Rus
  • KenMKenM Posts: 657
    edited 2004-08-24 04:01
    Slightly modified pcb.

    Ken.

    See notes in the private message
    pcb
    pcb
    IRL520 6 Solenoid Driver Board with LED indicators.pcb
    15K
  • Photon ArtistPhoton Artist Posts: 18
    edited 2004-08-26 13:55
    I have made additional changes to the PCB for the IRL520 Driver Board.
    Rather than having to wire a stamp to it I have integrated the OEMBS2.
    I have also added an LM2940CT-12 voltage regulator (12vdc 1amp) to power both the stamp and the solenoids.· I added a 22pf Electrolytic Cap fromthe output to ground as suggested by the Vreg manufacturer spec sheets.· Should I also add a .47pf cap to the supply side of the Vreg? This will be powered by a wall wart.· The OEMBS2 has a regulator that would then regulate this down to the required 5volts.
    Do you foresee any problems designing the board this way?
    Should I stick with separate power supplies for the driver board and stamp?
    Attached is the PCB layout in ExpressPCB

    KenM said...
    Slightly modified pcb.

    Ken.

    See notes in the private message
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "My mind wanders...I'm just along for the ride!
    pcb
    pcb
    Rev3 - IRL520 6 Solenoid Driver Board with LED indicators.pcb
    17K
  • NewzedNewzed Posts: 2,503
    edited 2004-08-26 14:28
    If I remember correctly the Stamp on-board regulator will only handle about 50ma total.· Your regulator should be a 7805 if you want to supply 5VDC to the Vdd pin on the Stamp.

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    Sid Weaver
    Pluggable Serial Backpack

    http://hometown.aol.com/newzed/index.html
    ·
  • Photon ArtistPhoton Artist Posts: 18
    edited 2004-08-26 20:29
    Sid,

    I am supplying 12 volts to the Vss pin on the stamp and allowing the onboard stamp regulator to regulate it down to 5.

    Rus

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "My mind wanders...I'm just along for the ride!
  • nick bernardnick bernard Posts: 329
    edited 2004-08-28 00:25
    thats a bad idea.

    if you put a potential on the vss pin then you risk a reverse polarity situation.

    also you should take advantage of your board space and spread out you components.

    and lay out your components in a nice neat manner before you run your traces because you should make your end product look nice to random joes that dont know jack a/b pcbs. you can usually route your traces to suit any layout. i attached a petty example w/o traces...

    also, if your going with the proto service, put lots of silkscreen lables to make your design very user friendly



    rox on
    nick B
    pcb
    pcb
    suggestion.pcb
    2K
  • Photon ArtistPhoton Artist Posts: 18
    edited 2004-08-28 01:47
    NIck,

    How would you recommend powering the stamp?·

    RUs
    nick bernard said...

    thats a bad idea.

    if you put a potential on the vss pin then you risk a reverse polarity situation.

    also you should take advantage of your board space and spread out you components.

    and lay out your components in a nice neat manner before you run your traces because you should make your end product look nice to random joes that dont know jack a/b pcbs. you can usually route your traces to suit any layout. i attached a petty example w/o traces...

    also, if your going with the proto service, put lots of silkscreen lables to make your design very user friendly



    rox on
    nick B
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "My mind wanders...I'm just along for the ride!
  • nick bernardnick bernard Posts: 329
    edited 2004-08-28 04:51
    vss = ground <> 12v
    vdd = +5v or Vin = 16 to 24v

    rox on
    nick B
  • Photon ArtistPhoton Artist Posts: 18
    edited 2004-08-28 16:14
    Nick,



    Sometimes I'm jsut a moron.· I misspoke.

    For once I actually had it right.· On the Board Vin is connected to the external regulator 12+ output and Vss is to ground.

    Rus

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "My mind wanders...I'm just along for the ride!
  • nick bernardnick bernard Posts: 329
    edited 2004-08-30 16:36
    hehe

    just messin with ya dude
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