Hello,
On the e2e we give advice on circuit design and debugging designs. We also help the engineer debug simulations issues. So I will not be able to run a simulation for you. If you can tell me what errors you are seeing we can give guidance on how…
Hello,
6 to 1 is quite a large variation in input voltage. You might be better designing with a DCM flyback converter that uses variable frequency. You can do this with a primary side regulated UCC28704 or a UCC28742.
The following link will bring you…
Part Number: UCC28704
I am currently testing Conductive Immunity/Susceptibility (IEC 61000-4-6) on a product using the UCC28704 and the supply voltage collapses at levels 3(10Vrms) and level 2(3Vrms).
Once the field is removed the supply returns to normal…
Part Number: UCC28704 Hi,
Hope you are doing good.
We are trying to run the simulation model of ucc28704 based on the webench provided report.
The output is falling to zero and the VDD pin is reading 100V which is way too high from the datasheet.
I am…
Part Number: UCC28704 Hi,
I am working on flyback converter with the chip UCC28704. The chip turns-on well, producing 13V output. But a few msec later it sends pulses at 170kHz or more, with very short duty cycle, even though the max switching freq of…
Part Number: UCC28704 Other Parts Discussed in Thread: UCC24636 We are trying to design a AC to DC power generator design using the flyback controller UCC28704 IC. The simulation tool used is LTSpice which uses PSpice model files. Unfortunately, TI's…
Part Number: UCC28704 Hi,
I designed a flyback converter with the UCC28704. I am using the transformer 750811613. The output of the converter should provide one output of 12V and 1 output of 5V while the auxiliary output should be 20V. Unfortunately, the…
Hi Ulrich, I received an update from the customer as follows:
Ulrich Goerke said: Also, please remove the leaded probe resistor from the VS node. This 1~2K resistor was used by the customer to isolate the probe capacitance from VS, but the resistor itself…
Part Number: UCC28704EVM-724 Other Parts Discussed in Thread: UCC28704 , UCC28722 Tool/software: I would like to use the UCC28704EVM-724 design as a starting point for a high input voltage, isolated, DC-DC converter. Input voltage range = 200Vdc - 1200Vdc…
Hi Peter,
For now, we can only recommend controllers (external FET) at this power level. Here are some options:
1. Lowest solution cost - UCC28750
2. Lowest standby power - UCC28730
3. Best balance between cost and standby power - UCC28704
I hope this…
