LTC1144 Simple Conversion of 15V to -15V Supply
post-172863
Thread Starter
Post #1 of 7

braillediver

Headphoneus Supremus
Joined
Jun 9, 2002
Messages
4,547
Reaction score
20
Joined
Jun 9, 2002
Posts
4,547
Likes
20
Cleaning up here at work I found some LTC1144 “Switched-Capacitor Wide Input Range Voltage Converter with Shutdown”. The Data sheet claims “Simple Conversion of 15V to -15V Supply”.

http://www.linear.com/prod/datasheet.html?datasheet=246

Has anyone ever used these? Seems like an easy way to get + and – from a single source?

I’m gonna play with these this weekend.
 
     Share This Post       
post-172982
Post #2 of 7

aeberbach

Headphoneus Supremus
Joined
Sep 20, 2001
Messages
1,807
Reaction score
11
Location
Melbourne, Australia
Joined
Sep 20, 2001
Location
Melbourne, Australia
Posts
1,807
Likes
11
I've used a Cosel ZW30515 - similar thing except that this one needs no external caps. 5V in, +- 15V out. Headroom use the same component in a couple of their designs. Keep it as far away from other components as physically possible and make sure everything is grounded/shielded as appropriate, they use an osciallator internally. The ZW30515 comes in a can so it shields itself somewhat.
 
     Share This Post       
post-173071
Post #3 of 7

jasong

Head-Fier
Joined
Jul 25, 2002
Messages
56
Reaction score
10
Joined
Jul 25, 2002
Posts
56
Likes
10
Seems like a bit of a communication problem here...the datasheet for LTC1144 says that it takes 15v (for instance) and converts to
-15 v, not 15 to +-15.

> It performs supply voltage conversion from positive to negative from an input range of 2V to 18V, resulting in complementary output voltages of -2V to -18V<


-jasong
 
     Share This Post       
post-173111
Post #4 of 7

CaptBubba

Not dumb enough fora custom title...so he thought.
Joined
Jun 30, 2001
Messages
1,615
Reaction score
11
Joined
Jun 30, 2001
Posts
1,615
Likes
11
yeah, and look at that graph at the bottom. The output voltage will be all over the place when using an amplifier, because the current drawn isn't constant. I don't see that as being a good thing. Or maybe I am wrong and just seeing problems where none exist.
 
     Share This Post       
post-173112
Post #5 of 7

braillediver

Headphoneus Supremus
Joined
Jun 9, 2002
Messages
4,547
Reaction score
20
Joined
Jun 9, 2002
Posts
4,547
Likes
20
Thanks this input will save me some time.

I also found some OP27's. The data sheet has a phono pre-amp schematic. The best part is the References at the end

http://www.analog.com/productSelection/pdf/OP27_a.pdf

Jung, Lip****z I haven't read the books but the names are familiar.


 
     Share This Post       
post-173528
Post #6 of 7

tangent

Top Mall-Fi poster. The T in META42.
Formerly with Tangentsoft Parts Store
Joined
Sep 27, 2001
Messages
5,969
Reaction score
55
Joined
Sep 27, 2001
Posts
5,969
Likes
55
That's what the power capacitors are for -- to smooth out the current demand on the power supply.
 
     Share This Post       
post-173553
Post #7 of 7

Joobu

Head-Fier
Joined
Aug 25, 2001
Messages
64
Reaction score
0
Joined
Aug 25, 2001
Posts
64
Likes
0
Capacitors can smooth out transients but in terms of switchers, inductor-less (capacitor) voltage converters typically have poor load regulation. Load variations over several mA can seriously affect the voltage. The way I see it, all switchers are a headache unless absolutely necessary (weight, size).
 
     Share This Post       

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top