hi ssssss said:does anybody used this chip before?
i'm using it right now for my car smps and its great
put your full working schematic here with thanks
2pist said: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
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
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
Schematic
http://www.klausmobile.narod.ru/projects/pr_05_carpower_e.htm
And I think you are right , the UC1825 is the military version.
http://www.klausmobile.narod.ru/projects/pr_05_carpower_e.htm
And I think you are right , the UC1825 is the military version.
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