Part Number: UCC28C54 Hello,
I'm using UCC28C54 with an input voltage of 1000V max.
I used a resistors voltage divider so the VDD input voltage is 20V.
I'm currently investigating the situation of reverse polarity connection in the HV input. I couldn…
Part Number: UCC28C54
Tool/software:
Hi,
I would like to ask about EMI tests. I have cca 100W flyback without pfc, with UCC28C54 and Synchronious rectifier. Switching frequency cca 95 kHz. I tried to handle peaks caused by switching frequency by dumping…
Part Number: UCC28C54 Hi
I used the WEBench designer for an AC/DC design using the UCC28C54, and got the design in the attached PDF. I built it according to the design, but the UCC28C54 does not start. Digging into the details I notice two things. First of…
Hi Thomas,
The first waveforms that you showed me shows the converter switching correctly. This means that something is wrong with the feedback resistor divider and the output voltage reflected value. Please, verify your FB divider resistor.
Thank yo…
Part Number: UCC28C54-Q1 Other Parts Discussed in Thread: UCC28C54 Hi
I read the article on common mistakes in flyback power supplies (linked below) with great interest and took special notice about the OVP and OCP functionality. Then I dove into the UCC28C54…
Part Number: UCC28C54-Q1 Hi
In the datasheet page 35 a crossover frequency of 625 Hz is selected for the typcial application design exemplified in the datasheet, and then the error amplifier mid-frequency gain is determined to 14,6 V/V. How do I choose…
Part Number: UCC28C54-Q1
Hi
I have an AC/DC flyback converter designed for 240V AC --> 12V 84W DC. It's based mainly off a webench design and the datasheet typical application design. With a small load it outputs 12.2 volts. With 10 W load it outputs…
Part Number: UCC28C54 Other Parts Discussed in Thread: PMP21098
Hello
Out of WEBENCH I got a design for an AC/DC 240VAC --> 12VDC 7A converter. It uses the UCC28C54. It also uses a custom transformer with a "turn/ratio" of about 10 turns Np:Ns, 146…
Part Number: UCC28C54 Other Parts Discussed in Thread: UCC28C42
As shown in the figure above, when I used UCC28C54 for simulation, the following error occurred. May I ask what caused it?
Part Number: UCC28C54 Other Parts Discussed in Thread: UC2844 , UCC28C44 , TL431 Hi Teams,
What's this resistor's function? Can the converter work without this resistor?
How to design this resistor's value?
BRS,
Marsh