Part Number: UCC256402 Hello,
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1244602/ucc256402-soft-start-issue?tisearch=e2e-sitesearch&keymatch=soft%20start%20UCC256402#
Further to our discussion soft…
Part Number: UCC256402 I would like to use an external driver to reduce the dissipation in the UCC256402 and reach higher frequencies.
According to the datasheet the HS pin is used as a reference for the dead time, so I assume that i should not connect…
Part Number: UCC256402 Other Parts Discussed in Thread: UCC24624 Hi,
I have a correctly working 72V to 14.5V LLC convertor design with UCC256402. Here is the output section of it.
Its output rectifiers get verry hot. So I added synchronous rectification…
Part Number: UCC256402 Hi,
Vbulk is the rectified bus voltage, Vin=170-300Vac.
When Vin=170-280Vac, it is good.
However, when Vin=290Vac~300Vac, the input voltage is energized for the first time and there is no output voltage; Then turn off and power…
Part Number: UCC256402 I'm currently working with 72VDC to 14.45VDC converter.
My previous design working well, instead output rectifiers heating. So I added a SR controller with MOSFETs.
My new design not working as expected. I checked my new rectification…
Part Number: UCC256402
Hi, I'm developing a 550W LLC resonant converter for converter 72VDC (IN) to 14.40VDC (OUT). and c22 c23 are the 2.2uf resonant caps. The resonant inductor is L1 0.6uH MPC075LR60C. trans primary winding is 7.7uH and Np/Ns = 2.5…
Part Number: UCC256402 Hi we are using UCC256402 LLC Controller for our 200W project(28V output) we are having problems with soft start. At initial condition the slope is very high it is rising upto 20V within very less time. we tried different combinations…
Hi Marcel,
Could you share the waveforms. Is the controller going into fault mode?
After you change the BMT values, are you seeing the issue at all loads or only at no load?
Regards
Manikanta P
Part Number: UCC256402 Hi,
Our team is currently in the process of designing a DC/DC converter utilizing the UCC256402 and incorporating GaN devices.
Our objective is to achieve a higher working frequency, exceeding 500kHz.
However, we encountered difficulties…
Part Number: UCC256402 Other Parts Discussed in Thread: UCC28180 , Hi, We are using UCC256402 LLC controller in combination with Boost PFC UCC28180 for 200W AC-DC converter. We are seeing repeated failure of LLC IC as below:
Case 1: During turn-on after…