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Old 02-24-2011, 08:38 PM #33
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Default Re: Building Tiny DDL Driver

Ah, alright, that makes sense. So what type of cap would you recommend for the input/output caps? I ordered 50 uF SMD caps from Mouser, I figured I would use those. Are those alright?


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Old 02-24-2011, 08:42 PM #34
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Default Re: Building Tiny DDL Driver

Quote:
Originally Posted by Wolfman29 View Post
Ah, alright, that makes sense. So what type of cap would you recommend for the input/output caps? I ordered 50 uF SMD caps from Mouser, I figured I would use those. Are those alright?
Ceramic caps are recommended as they have very low ESR ratings. Please post the link to the ones you got from mouser and Ill check them out.
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Old 02-24-2011, 08:46 PM #35
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Default Re: Building Tiny DDL Driver

I just realized I didn't give you the actual number of uFs they're capacitances are. They are 10uF caps, and I bought 50 of them.

Let me find the link.

Ah, here it is: C3216Y5V1A106Z/0.85 TDK Multilayer Ceramic Capacitors (MLCC) - SMD/SMT
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Old 02-24-2011, 09:06 PM #36
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Default Re: Building Tiny DDL Driver

Jib:
Thanks for the clarification - very much appreciated.
(Is it ok to address you as "Jib"? Lol, "Jib77" sounds so formal!)

I haven't been protecting the inputs of my LM1117 drivers with caps, just the outputs - so I need to correct that in future builds. I've been using a 10uF electrolytic radial cap for the output to diode. But truthfully, I don't really know if I should be using 1uF, 10uF, or 100uF. And does it need to be ceramic for the diode cap too? Or is it just the LDO IC that cares about low ESR?
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Old 02-24-2011, 09:06 PM #37
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Default Re: Building Tiny DDL Driver

Quote:
Originally Posted by Wolfman29 View Post
I just realized I didn't give you the actual number of uFs they're capacitances are. They are 10uF caps, and I bought 50 of them.

Let me find the link.

Ah, here it is: C3216Y5V1A106Z/0.85 TDK Multilayer Ceramic Capacitors (MLCC) - SMD/SMT
Those should work great.
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Old 02-24-2011, 09:12 PM #38
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Default Re: Building Tiny DDL Driver

Would you suggest 10uF for both input to driver and output to diode?
And since I'm a sucker for the low shipping costs on eBay, could I get away with:
Fujicon Electrolytic Cap 10uF 50V 105C LOW ESR x25pcs - eBay (item 320657250404 end time Mar-15-11 23:00:51 PDT)

?
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Old 02-24-2011, 09:23 PM #39
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Default Re: Building Tiny DDL Driver

Perfect! I can't wait to begin building my driver... I guess I will make a new thread for it once it's fully built with pictures and parts and stuff! Should be fun. Now I just have to wait until Saturday or next Monday to get my parts (I assume, because it is shipping within the US).
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Old 02-24-2011, 09:46 PM #40
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Default Re: Building Tiny DDL Driver

Quote:
Originally Posted by rhd View Post
Would you suggest 10uF for both input to driver and output to diode?
And since I'm a sucker for the low shipping costs on eBay, could I get away with:
Fujicon Electrolytic Cap 10uF 50V 105C LOW ESR x25pcs - eBay (item 320657250404 end time Mar-15-11 23:00:51 PDT)

?
I cant find their ESR rating anywhere, "LOW" in this case is a marketing term used to say its lower than the other guys, not an indication of its actual rating ... but my gut feeling is no. Only ceramic and very expensive tantalum caps have the low ESR needed. You can always parallel a small cheap ceramic (like a 0.1uF) with the electrolytic to keep the ESR down.
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Old 02-25-2011, 01:00 AM #41
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Default Re: Building Tiny DDL Driver

One other question - Do we have an LDO version of the LM338?

IE - the low dropout of the LM1117, with the higher current capabilities of the LM338, and the same pinout as all of the above?
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Old 02-25-2011, 01:53 AM #42
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Default Re: Building Tiny DDL Driver

LM1084 - National Semi
LT1084 - Linear Tech
LD1084 - ST Micro
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Old 02-25-2011, 02:10 AM #43
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Default Re: Building Tiny DDL Driver

1084 not 1085 ?
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Old 02-25-2011, 02:12 AM #44
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Default Re: Building Tiny DDL Driver

1084 is limited to 5A
1085 to 3A
and 1086 to 1.5A.
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Old 02-25-2011, 02:26 AM #45
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Default Re: Building Tiny DDL Driver

Yup ... LM338 is a 5A part, so 1084 is the 5A LDO equivalent. But 1085 can be used too if you dont need more than 3A. All have same pinout.
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Old 02-25-2011, 02:35 AM #46
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Default Re: Building Tiny DDL Driver

1085s ordered

Same resistor calculation too?
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Old 02-25-2011, 02:36 AM #47
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Default Re: Building Tiny DDL Driver

Probably.. yup!

... did you got the ADJ version, right?
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Old 02-25-2011, 02:39 AM #48
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Default Re: Building Tiny DDL Driver

Sure did
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