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Discussion Groups | BasicX | Voltage Regulator
Discussion forum for the BasicX family of microcontroller chips.
Voltage Regulator - dani...@amberjacksolutions.com - Oct 13 8:31:16 2009
Hi everyone!
I'm working with a BX24 and I'm trying to use the 5V that come from the pin21 to supply a MAX146 that needs 2.7-3.3V.
For that I'm using the Voltage Regulator LM3940IT-3.3V
(http://pt.farnell.com/national-semiconductor/lm3940it-3-3/v-reg-ldo-3-3v-3940-to-220-3/dp/9494553?Ntt=949-4553)
My problem is that the output voltage from this voltage regulator is is almost the same as the input voltage (around 5V instead of 3.3V)
Anyone have any idea why this Voltage regulator inst working?
Or inst suppose to work in this application?
Best regards,
Daniel Antunes
------------------------------------
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
I'm working with a BX24 and I'm trying to use the 5V that come from the pin21 to supply a MAX146 that needs 2.7-3.3V.
For that I'm using the Voltage Regulator LM3940IT-3.3V
(http://pt.farnell.com/national-semiconductor/lm3940it-3-3/v-reg-ldo-3-3v-3940-to-220-3/dp/9494553?Ntt=949-4553)
My problem is that the output voltage from this voltage regulator is is almost the same as the input voltage (around 5V instead of 3.3V)
Anyone have any idea why this Voltage regulator inst working?
Or inst suppose to work in this application?
Best regards,
Daniel Antunes
------------------------------------
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Voltage Regulator - "Harry J. White" - Oct 13 10:01:04 2009
Daniel,
Check pins 1 and 3. Make sure you have the polarity correct. I can't think
of anything else that would cause that problem.
Harry
_____
From: b...@yahoogroups.com [mailto:b...@yahoogroups.com] On Behalf Of
d...@amberjacksolutions.com
Sent: Tuesday, October 13, 2009 8:31 AM
To: b...@yahoogroups.com
Subject: [BasicX] Voltage Regulator
Hi everyone!
I'm working with a BX24 and I'm trying to use the 5V that come from the
pin21 to supply a MAX146 that needs 2.7-3.3V.
For that I'm using the Voltage Regulator LM3940IT-3.3V
(http://pt.farnell.
com/national-semiconductor/lm3940it-3-3/v-reg-ldo-3-3v-3940-to-220-3/dp/9494
553?Ntt=949-4553)
My problem is that the output voltage from this voltage regulator is is
almost the same as the input voltage (around 5V instead of 3.3V)
Anyone have any idea why this Voltage regulator inst working?
Or inst suppose to work in this application?
Best regards,
Daniel Antunes
Dynatest Confidential
Note: This message and any attachment hereto is intended solely for the use of
the designated recipient(s) and their appointed delegates and may contain
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distribution of its contents is strictly prohibited. If you have received this
message in error, please destroy it and advise the sender immediately by phone,
email, or fax. Thank you for your cooperation
[Non-text portions of this message have been removed]
------------------------------------
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Check pins 1 and 3. Make sure you have the polarity correct. I can't think
of anything else that would cause that problem.
Harry
_____
From: b...@yahoogroups.com [mailto:b...@yahoogroups.com] On Behalf Of
d...@amberjacksolutions.com
Sent: Tuesday, October 13, 2009 8:31 AM
To: b...@yahoogroups.com
Subject: [BasicX] Voltage Regulator
Hi everyone!
I'm working with a BX24 and I'm trying to use the 5V that come from the
pin21 to supply a MAX146 that needs 2.7-3.3V.
For that I'm using the Voltage Regulator LM3940IT-3.3V
(http://pt.farnell.
com/national-semiconductor/lm3940it-3-3/v-reg-ldo-3-3v-3940-to-220-3/dp/9494
553?Ntt=949-4553)
My problem is that the output voltage from this voltage regulator is is
almost the same as the input voltage (around 5V instead of 3.3V)
Anyone have any idea why this Voltage regulator inst working?
Or inst suppose to work in this application?
Best regards,
Daniel Antunes
Dynatest Confidential
Note: This message and any attachment hereto is intended solely for the use of
the designated recipient(s) and their appointed delegates and may contain
confidential information. Any unauthorized use, disclosure, copying, or
distribution of its contents is strictly prohibited. If you have received this
message in error, please destroy it and advise the sender immediately by phone,
email, or fax. Thank you for your cooperation
[Non-text portions of this message have been removed]
------------------------------------
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Voltage Regulator - Tom Becker - Oct 13 10:08:45 2009
As Harry suggests, you might have it backwards - or the ground pin isn't
grounded, or the regulator has failed.
Tom
------------------------------------
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
grounded, or the regulator has failed.
Tom
------------------------------------
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Voltage Regulator - dani...@amberjacksolutions.com - Oct 13 10:18:17 2009
Sorry, guys
My mistake... I thought it would work without the capacitor connected to the output pin... As soon as I plugged a 47uF capacitor, it started to work.
Thanx for your help anyway!
Regards
Daniel
Hi everyone!
>
>I'm working with a BX24 and I'm trying to use the 5V that come from the pin21 to supply a MAX146 that needs 2.7-3.3V.
>For that I'm using the Voltage Regulator LM3940IT-3.3V
>
>(http://pt.farnell.com/national-semiconductor/lm3940it-3-3/v-reg-ldo-3-3v-3940-to-220-3/dp/9494553?Ntt=949-4553)
>
>My problem is that the output voltage from this voltage regulator is is almost the same as the input voltage (around 5V instead of 3.3V)
>
>Anyone have any idea why this Voltage regulator inst working?
>Or inst suppose to work in this application?
>
>Best regards,
>Daniel Antunes
>------------------------------------
------------------------------------
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
My mistake... I thought it would work without the capacitor connected to the output pin... As soon as I plugged a 47uF capacitor, it started to work.
Thanx for your help anyway!
Regards
Daniel
Hi everyone!
>
>I'm working with a BX24 and I'm trying to use the 5V that come from the pin21 to supply a MAX146 that needs 2.7-3.3V.
>For that I'm using the Voltage Regulator LM3940IT-3.3V
>
>(http://pt.farnell.com/national-semiconductor/lm3940it-3-3/v-reg-ldo-3-3v-3940-to-220-3/dp/9494553?Ntt=949-4553)
>
>My problem is that the output voltage from this voltage regulator is is almost the same as the input voltage (around 5V instead of 3.3V)
>
>Anyone have any idea why this Voltage regulator inst working?
>Or inst suppose to work in this application?
>
>Best regards,
>Daniel Antunes
>------------------------------------
------------------------------------
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )