Part Number: UCC28911 Customer used UCC28911 for the aux power for the AC-DC PSU. Now they were required to shut down UCC28911 if there was external power supply at the output. Thus, they needed to find a way to disable UCC28911 when required, like MCU…
Hi, Sean and Mike,
I am now designing a 15V/300mA high voltage buck with UCC28911, same topology as PMP10767, now it can only output 145mA at less than 80VDC input voltage, if I increase input voltage to >80VDC, then output voltage will drop, and keep dropping…
Part Number: UCC28911
Hello,
UCC28911 is used as follows:
VIN: 270V ~ 370VDC
VOUT: 14V/100mA x3 secondary outputs
Lp = 3.3mH
Lk = 31uH
NPA = 5.51
NPS = 6.96
Schematic is attached.
An Intermittent Operation is observed where the chip will work for a minute…
Hello,
The circuit is most likely shutting down due to OCP, OVP or input under voltage fault. The following link will bring you to an application note that describes what the issues with this fault sensing and how to resolve.
https://www.ti.com/lit/pdf…
Part Number: UCC28911 Hi team,
Referring to the application note of snva750, the Vbrownout = 43V at the equation (1). Could you give me comment on how to derive the value as 43V? The lowest input voltage looks to be came from 85Vac, and the datasheet…
One more questions about valley switch mechnisam. Below diagram is capture from UCC28911 datasheet.
Base on my understanding, when VDS drop nearby zero means MOSFET turn-on, and I marked three turn on cycle with red circle.
I don't understand what the…
Part Number: UCC28911 Other Parts Discussed in Thread: UCC28700-Q1 , UCC28700 We are developing a cost sensitive device that would be powered from a 48V/60V Lithium battery pack in an electric vehicle. Overall the main components of the device would have…
Part Number: UCC28911 Other Parts Discussed in Thread: LM5021 Hi team,
The parameters indicate that Vinmax=450V, but I could not see a confirmation of the limitation in the datasheet.
Is there any reason someone could not use this device up to 600V ? …
Part Number: UCC28911 Other Parts Discussed in Thread: UCC28730 , UCC28910 Dear TI Team
Our customers are looking for reference designs and devices that meet the following conditions: ・ AC85 ~ 264V input ・ 5V 0.5A output ・ Non-insulated type
I searched for…
Part Number: UCC28911 Hi,
My customer is considering using UCC28911 because they require small solution.
Conditions are below;
VIN=AC100V
VOUT=2V
IOUT=600mA
Do you think that UCC28911 can output 2V?
If no, what is the cause of the lower voltage limit…
