Part Number: PMP20946 Why LCC topology is applied as the isolated DC-DC stage of the PMP20946 design? Where should I pay extra attention to on using the UCC25630x LLC controller for wide output voltage power supply design like PMP20946?
Hi Mrinal,
You should have a diode connected to the emitter Q6. Otherwise, you will be exceeding the breakdown voltage of both zener and base emitter voltage as Vcc is charged to 26V initially through HV pin.
See attached schematic:
PMP20946 Schemati…
Rock
1. Our customers asked whether UCC28780 +PFC can achieve 200W?
While we do not have any reference design at this power level, PFC+UCC28780 should be able to work at this power level
2. Is there any other recommended solution? PFC+LLC, PFC+Flyback,…
Part Number: UCC256301
Hi Sir,
I saw TI has LCC power topology reference design use PMP20946 on the web, but just provide test reports and performance. so, could you help us to provide design guidelines in LCC power topology to my email? such as LCC tank…
Hi Luca,
PMP20946 uses UCC256301 LLC controller which has integrated gate drivers. PMP4317 uses an external gate driver + gate drive transformer. PMP20946 does not need an auxiliary supply to provide bias power on the primary side. PMP4317 uses UCC28610…
Hi Milind
The PMP20946 shows how the UCC28180 and UCC25630 can combined together
www.ti.com/.../PMP20946
I also noticed that they are powering the UCC28180 from the RVCC pin of the UCC25630 which does not work all the time as the min voltage from the…
Hi Yue,
Is the input voltage AC or DC? Normally we see applications that have a PFC front end, UCC28180, to converter the AC to a 400V regulated DC bus and then at this power level customers use the LLC topology to converter the 400V DC to the output…
Jim
Can you provide a specific reference design that has PFC but does not include this information? Do you have a specific design in mind that has an input current shaping requirement?
Typically our test reports for designs with PFC include THD and…
Hi Mohitha,
Do you have your LEDs connected to the flyback output? The flyback regulates output voltage. It does not regulate output current however. It is capable of supporting up to 1.2A output but the exact output current will depend on how much the…