Part Number: UC3823A Other Parts Discussed in Thread: UC1825 , UC1823 Short description: Unable to obtain PWM duty cycle of less than 30% with UC3823A.Case details or comments:
When error amplifier output voltage (pin 3) is lowered, the duty cycle reduces…
Part Number: UC3823A Other Parts Discussed in Thread: UC3825A Hi Team,
Customer is asking if we can provide UC3823A or 3825A spice model?
Thanks!
Andrew
Part Number: UC3823A Other Parts Discussed in Thread: UC3823 , UC3823B Hi Team,
Could any expert help to check if we have any temp related characterization data for pin 9?
Etther UC3823/UC3823A/UC3823B is ok.
Customer is asking, thanks!
Andrew
Part Number: UC2825B Other Parts Discussed in Thread: UC3823A , UC3825A , UC2825
I am searching for ways to set up the UC2825B for a flyback converter DC to DC; however, the its datasheet is very generic without pointing into how to set up the circuitry…
Part Number: UC2825B Other Parts Discussed in Thread: UC3823A , UC3825A , UC2825 Team,
My customer has been using this PWM Controller UC2825BN in a flyback converter for 20+ years. They are changing a few parts around this circuitry, especially the switching…
Other Parts Discussed in Thread: UC2825A , TL431 Hello,
I'm using the UC2825a for a voltage-controlled halfbridge converter. I need help for the isolated feedback. Because of the 1.25-V-Ramp-offset and the comparator-offset, the output of the integrated…
Other Parts Discussed in Thread: UC3823A , UC3823 I am considering using the UC3823 PWM controller but I noticed that there is a UC3823A version also available. I would consider using the A version except that I will be driving SiC FETs so I need 20 volts…
Hello Now when I'm testing, I gets some problems. The the duty cycle gets low very fast. It goes from about 60% to about 5% when the input voltage goes from 22-30V. When the duty cycle get to low, the regulator stops. It seems that the mosfet does not…
Other Parts Discussed in Thread: UC3823A Using the circuit in Figure 10 on Page 9 of the UC3823A spec sheet does not work on the bench or in simulation at 19.5 kHz unless replacing 39pF with 4700pF, 120 ohms with zero and 22 ohms with 16 ohms. Using Rt…
When increasing power FET current to test the ILIM function I find that the output goes low as it should when ILIM is exceeded, but a single 5 usec pulse appears at the output about 800 usec after the ILIM comparator trips. Soft start C = 10uF, Rt = 42…
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