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Old 28th December 2017, 06:59 AM   #1321
feverdiy is offline feverdiy  Hong Kong
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Hi Salas,

I need two 1.2V for supply the DAM1021 CPU and bias the digital isolation transformer.
If I use one Reflektor-D at 5V output and connect to two LM317 (set both output to 1.25V).
Will Reflektor-D stable in this application ? and safe to do so (connecting the output to another 3pins regulator) ?

Thank you.
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Old 28th December 2017, 05:45 PM   #1322
Salas is offline Salas  Greece
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Connecting REF-D's output to distributed chip regulators is stable as many already use it in such a master reg's role.
Prefer low noise modern LDO than 317 if you can. Like LT1963A in DCQ package which is easy to solder by hand despite surface mount.

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Old 29th December 2017, 12:35 AM   #1323
feverdiy is offline feverdiy  Hong Kong
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Quote:
Originally Posted by Salas View Post
Connecting REF-D's output to distributed chip regulators is stable as many already use it in such a master reg's role.
Prefer low noise modern LDO than 317 if you can. Like LT1963A in DCQ package which is easy to solder by hand despite surface mount.

Click the image to open in full size.
Thank you for your advice.
Could you tell me the different between LT1963 and LT1963A ? Because I can get LT1963 easier than LT1963A.
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Old 29th December 2017, 01:17 AM   #1324
Salas is offline Salas  Greece
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TL1963ADCQT type is stable to ceramic output capacitor. Made by Texas its cheap enough in that package. The TPS7A4501DCQR is its alternative.
Bypass ceramics of high coefficient dielectrics have unstable characteristics vs bias voltage and temperature. But this is a concern in industrial grade.
You will use 10uF electrolytics of no more than 3 Ohm ESR very close to its input and output pins. You have to read the datasheet carefully anyway.
There is also the more expensive LT1963ET from Analog Devices/LT which is TO-220 and adjustable but not that tolerant to high coefficient ceramics.
Fixed output 3pin variety LT1963s don't come in lower preset than 1.5V unfortunately and are SMD only.
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Old 29th December 2017, 01:52 PM   #1325
wyan is offline wyan
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Hi, Salas, just want to say thanks for the wonderful design.

I like it so much that I had to make a version to accommodate Mundorf 4-pin cap as C2 capacitor to filter LEDs.

Also, it is very useful to keep those socket pins. Voltage can be changed to desire any time. Cheers.
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Old 29th December 2017, 02:55 PM   #1326
Salas is offline Salas  Greece
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Nice. What equipment does it power?
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Old 29th December 2017, 02:58 PM   #1327
wyan is offline wyan
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Hi, I am using three for DAM1121, two for DIYinHK USB to I2S board. And I shall use them to a ES9038Pro project. Just so easy to use and works so great! Thanks again.
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Old 2nd January 2018, 02:17 PM   #1328
pistollero is offline pistollero  Portugal
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Hello, is the quality of rx important as r6 for the 3.3v setting??
i going to use vishay var on r6 i donīt know if is need too for rx....
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Old 2nd January 2018, 03:02 PM   #1329
Salas is offline Salas  Greece
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Rx's importance is marginal. Just use a good 50ppm - 100ppm 1/4W metal film.
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Old 7th January 2018, 10:28 AM   #1330
pistollero is offline pistollero  Portugal
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Thanks Salas for you response.
can you explain me about the capacitors on reflektor-d...
for example i bought russian teflon 6800pf to use with r5 2.2ohm.
what do i need to measure or know about the specs for comparing it to the wima mkp10... or vishay 1837... how to i know they are better or not technically...

about the c2... i īve been reading some datasheets and i found values for ripple current and impedance at 100kh.. with increase of voltage the better the ripple current and impedance.. and what about esr?? should i measure the esr??
what are the important specs of the c2 to have in account when picking the c2 cap?

is the same aspects of c2 applied to cm?

best regards
Nuno
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