Part Number: UC3843 Hi,
My customer want to confirm how much pulse width "D" varies as Vfb varies. Is there any equation related between the two?
Thank you in advance.
Regards, May
Part Number: UC3843 Dear Sir,
We are working of bring up and testing of DC-DC (Flyback) Converter (VIN: 32 to 75V DC and output 24V and 15W) based on UC3843, We are getting multiple pulses on Gate (Magenta Line in the waveform) and MOSFET Drain to Source…
I talked to another engineer, he said the temperature rise depended on the layout, cupper trace area, and ambient temperature, air flow, as so on. Typical temperature rise is from 25C to 35C. The key point is to make sure the junction temp is below the…
Part Number: UC3843
Input voltage range: 32-80V
Output voltage: 12V
Application: For Electric Vehicle controllers.
Hi, i am using this flyback circuit for designing controllers in electric vehicle. I am using the same circuit since 2-3 years and found…
Part Number: UC3843 Hi Team,
Please suggest a suitable controller for synchronous rectification Buck circuit and could you provide the reference design? Thanks!
A: Input voltage: 400V~800VDC
B: Output voltage: 300VDC
C: Output current: 10A
D: Non-iso…
Thanks for sharing test data. The power loss is doubled between 24Vin and 12Vin. Also, the thermal resistance of SOIC 8 is much higher than 14 pin. There is no doubt the temperature rise of 8-pins is much higher than 14 pin. You may measure what is actual…
Part Number: UC3843 Hello Forum Members,
I have got a UC 3843AN based laptop SMPS. The pin 2 (FB) is grounded. The supply is out of order with a fuse, bridge, MOSFET, Rs all damaged. Is there any reason for UC 3843AN pin 2 (FB) being connected to supply…
Part Number: UC3843 Other Parts Discussed in Thread: UC3825 Hi ，Have a good day.
we got a special power requirement that we hope to complete a flyback power supply with a wide voltage output to achieve adjustable output from 0V-250V, and the maximum power…
Part Number: UCC24630 Other Parts Discussed in Thread: UC3843 , , UCC24636 I am working with a power supply which input is 28V and output is +5V and -5V . Each channel of the output is 12A. I am planing to use the fly-back with two output windings. The…
Part Number: UC3843 Hi Team,
I see there is amplitude peak to peak voltage 1.7V typical for RT/CT pin in datasheet, just want to check the max positive side and min negative side voltage on RT/CT pin. 1.7V should be Vpositive-Vnegative. Thanks.
BRs
G…
