Powering an Arduino/stepper driver system with one DC input
hi all,
i designing pcb , stuck on how best distribute power. wonder if people here can help, please?
the board i'm building should accept 24v dc in, need power sparkfun stepper driver. on pcb arduino mega, usb host shield, , lcd display. i'd drop voltage down to, say, 9v , feed arduino , usb host shield. idea power 1 24v input , drop voltage on pcb, rather have 2 dc inputs 2 ac/dc adaptors. latter doesn't seem elegant solution.
i've built test rig arduino , lcd. tried powering 9v 1a ldo (digi-key ba09cc0wfp-e2tr-nd) gets way hot when feed 24v, heat sink. looked board-mount switching supplies. best find tdk-lambda accepts 18 36v , delivers 12v (digi-key: 445-2493-nd). 12v more i'd want, though, find regulators on arduino , host-shield can rather hot @ voltage. 1 possibility feed 12v 9v ldo , have power arduino , host-shield. won't produce less heat on all, @ least can make sure ldo soldered large ground plane , attach heat sink also. however, on test rig 12v input heat sink on ldo above hot touch. i'm not particularly happy tdk-lambda 9v ldo solution.
can think of better mix of components or better approach problem?
thanks!
edit: estimate i'd need 400 ma @ 9v. arduino plus lcd consume 250 ma, i'd need bit usb host shield plus usb peripheral it's feeding.
i designing pcb , stuck on how best distribute power. wonder if people here can help, please?
the board i'm building should accept 24v dc in, need power sparkfun stepper driver. on pcb arduino mega, usb host shield, , lcd display. i'd drop voltage down to, say, 9v , feed arduino , usb host shield. idea power 1 24v input , drop voltage on pcb, rather have 2 dc inputs 2 ac/dc adaptors. latter doesn't seem elegant solution.
i've built test rig arduino , lcd. tried powering 9v 1a ldo (digi-key ba09cc0wfp-e2tr-nd) gets way hot when feed 24v, heat sink. looked board-mount switching supplies. best find tdk-lambda accepts 18 36v , delivers 12v (digi-key: 445-2493-nd). 12v more i'd want, though, find regulators on arduino , host-shield can rather hot @ voltage. 1 possibility feed 12v 9v ldo , have power arduino , host-shield. won't produce less heat on all, @ least can make sure ldo soldered large ground plane , attach heat sink also. however, on test rig 12v input heat sink on ldo above hot touch. i'm not particularly happy tdk-lambda 9v ldo solution.
can think of better mix of components or better approach problem?
thanks!
edit: estimate i'd need 400 ma @ 9v. arduino plus lcd consume 250 ma, i'd need bit usb host shield plus usb peripheral it's feeding.
http://www.ebay.com/itm/dc-to-dc-converter-step-down-module-7v-9v-12v-24v-to-5v-usb-output-power-adapter-/251278536206?pt=lh_defaultdomain_0&hash=item3a815e2e0e
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quote
feature:
modules nature: non-isolated buck
rectification: non-synchronous rectification
input voltage: dc 7- 24v
output voltage: dc 5v
output current: 3a (max)
conversion efficiency: 96% (max)
switching frequency: 340khz
output ripple: 30mv (max)
load regulation: ± 0.5%
voltage regulation: ± 2.5%
operating temperature: -40 ° c +85 ° c
with overcurrent protection
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Arduino Forum > Using Arduino > Project Guidance > Powering an Arduino/stepper driver system with one DC input
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