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Old 19th June 2004, 12:30 AM   #1
sss is offline sss  Israel
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Default UC2825 smps controller

does anybody used this chip before?
i'm using it right now for my car smps and its great
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Old 19th June 2004, 08:44 AM   #2
2pist is offline 2pist  United States
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I'm using a NE556 dual timer. Cheap and works great. I use 1/2 as an oscillator and the other 1/2 as pwm with a 30v zener tied from the negative rail to pin 11 on the 556 for regulation.
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Old 22nd June 2004, 06:53 AM   #3
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Default Re: UC2825 smps controller

Quote:
Originally posted by sss
does anybody used this chip before?
i'm using it right now for my car smps and its great
hi sss
put your full working schematic here with thanks
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Old 22nd June 2004, 06:56 AM   #4
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Quote:
Originally posted by 2pist
I'm using a NE556 dual timer. Cheap and works great. I use 1/2 as an oscillator and the other 1/2 as pwm with a 30v zener tied from the negative rail to pin 11 on the 556 for regulation.
hi 2pist

you also put here your NE556 based schematic please
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Old 24th June 2004, 11:10 AM   #5
sss is offline sss  Israel
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hi himanshuraval
i'll put a schematic when i'll finish it
gotta design more things like remote and stuff like that
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Old 30th June 2004, 03:04 AM   #6
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Default UC 2825 PWM IC

Hi SSS,

Unitrode's (now TI's) numbering of chips goes something like this:

UC1XXX - Mil-Spec (-55C to +125C)
UC2XXX - Industrial (-40C to + 105C)
UC3XXX - Consumer (0C to +70C)

Hence, the UC 2825 is the industrial version of the UC3825. The Mil-Spec version would be the UC1825.

Basically, this series of PWM chips is pin-for-pin compatible with Motorola's (Now ON's) MC34025 (0C to +70C) and MC33025 (-40C to +105C) dual-ended PWM IC with 1MHZ oscillator. Good for off-line and DC-DC push-pull, half- and full-bridge topologies. Good bandwidth on the error amp, too. Can be used as either voltage-mode or current-mode.

Great chip! I have used them in 42-14V DC-DC Convcerters. A BIG improvement over the SG1525/2525/3525 (400kHz max) voltage mode-only PWM ICs.

Hope this insight helps!


'73,

Steve, N8XO
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Old 30th June 2004, 12:08 PM   #7
agent.5 is offline agent.5  United States
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I found this SMPS schematic using UC3825 (the military version of 2825). It looks very clean and quite low in part counts.

What does he mean when he say

"Transformer: 4.5 + 4.5 turns : 120 turns (that's core-specific of course)"

?
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Old 30th June 2004, 03:30 PM   #8
sss is offline sss  Israel
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4.5+4.5 turns mean 4.5 turns centre tap and another 4.5 turns
(2 primary coils with 4.5 turns each-push pull design)
i gues 120 is the number of turns for the secondary
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Old 1st July 2004, 01:37 AM   #9
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Default UC3825

agent.5,

I think you have it backward: the UC3825 is the consumer (commercial) version of the UC2825. And, the UC1825 is the Mil-Spec version. As for the schematic, I would be interested in seeing it.

Steve
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Old 1st July 2004, 02:16 AM   #10
agent.5 is offline agent.5  United States
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Schematic

http://www.klausmobile.narod.ru/proj...carpower_e.htm

And I think you are right , the UC1825 is the military version.
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