UCC28910: Single Live Wire Switch

Hey Allan,

TI does have a reference design that uses the UCC28910 that has low standby power designed to minimize input current, less than 500uA for loads less than 4mA.
Link: PMP9742

TI also has a training video on no-neutral setups from the High Voltage Interactive (HVI) training series. This video overviews how the no-neutral setup works and the fundamental problems and solutions that come with the no-neutral setup.
Link: training.ti.com/no-neutral-wire-application-smart-buildings-and-home-automation

Another solution is with the use of the UCC28730, which is an ultra low standby power device. It works with the UCC24650 to switch as low as 32Hz, achieving low standby power.

Can you provide more info about the PI-3V3-B4? I searched and saw that it is a 3.3V, 200mA regulator. Is that correct?

Regards,
Davit

Hi Davit,

Thanks for your reply. I don't find English version of datasheet PI-3V3-B4. Yes, it's a power module 13-380Vdc to 3.3V/200mA. The implementation of PI-3V3-B4 looks like below, refer from . 

Hi Davit,
We checked out the training video but customer don't prefer neither stealing power from Earth nor having parallel resistor with load. Their most concern is about how to not flick LED visible. Do you have another way to overcome the potential issue or EVM/reference design can share to customer for evaluation?

Thanks.
Allan

Hey Allan,

The current consumption during the LED off time has to be low enough to not cause flickering. This is dependent on LED itself. You will have to test with a range of LEDs in order to build some confidence with the design. It is not easy to say whether a no-neutral design will work with one LED compared to another because one LED may flicker during the off time but another will not.

Is there a reason they do not prefer to steal from earth?

Regards,
Davit

Hi Davit,

Noted. They don't prefer to steal from earth because in some places the plug may don't have it to connect.

Regards,

Allan