Part Number: UC2844A Other Parts Discussed in Thread: UC2844 , , UC2843 , UC2843A , UC2842A , UC2842 , UC2845 Hi Team,
May I know what the difference between UC2844A and UC2844 is?
In the datasheet of UC2844, I saw the Fosc = 2* Fsw.
In the datasheet…
Part Number: UC2844A Other Parts Discussed in Thread: UC2844 Hi,
Planning to make new SMPS design, previously had used UC2844 and external FET, in almost all of my Flyback converter design(20-60W) since last few years.
Input voltage range: 200VDC…
Part Number: UC2844A Hi Team,
May I ask if we have the value of UC2844A RT/CT pin threshold voltage for the device to start oscillate?
I cannot find such value in the datasheet.
Thanks.
Best Regards,
Livia
Part Number: UC2844A Other Parts Discussed in Thread: UCC28742 Is there any comparison table between UC2844A vs. PF6116? Is UC2844A good to compete with PF6116? What else?
Please find the below link for the PF6116. Thanks.
http://www.powerforest.com…
Other Parts Discussed in Thread: UC2844A , UC1844A , UC1843A , UC1845A , UC1842A We have question about UC2844A.
(UC2844ADTR)
Is NC pin connected to other pin or circuit inside the IC about UC2844ADTR?
We are concerned that the IC breaks out when…
Other Parts Discussed in Thread: UC2844A We have a question about UC2844A.
Please tell us the pin processing of NC pin.
Is this OPEN or connecting to other pins?
Best regards,
Takahiro Nishizawa
Part Number: UC2844A Other Parts Discussed in Thread: UCC28C44 Hi team,
A customer is using our UC2844A in their system, and they meet some issue of thermal now. 3 questions here, I found confused too, so I ask you for help:
1. According to junction…
Hello Bob,
The UC2844A is a fixed frequency controller and has a maximum duty cycle of 50%.
The switching frequency will not be changed based on duty cycle, it is fixed. The internal duty cycle clamp will not affect frequency accuracy.
Regards…
Hi Sharathkumar,
Adding the voltage regulator solved the frequency variation problem indicates the aux winding voltage was too high which damaged the internal VREF regulator and I suggest you to reduce the turns ratio to ensure the VCC rating is not…
Part Number: UC2844A Other Parts Discussed in Thread: UC3844A On the TI document "uc3844a.pdf" title "UCx84xA Current-Mode PWM Controller", Figure 8 have fsw=1.72/(Rt/Ct). Is this correct?
