Why low stand-by in LED drivers?

LYTSwitch-2 simple circuitWhen Power Integrations announced its LYTSwitch-2 family of mains LED driver ICs last week, an interesting snippet emerged – the firm has designed the driver with stand-by power consumption down at 30mW.

It is designed for used in retrofit bulbs, retrofits for fluorescent tubes, and ballasts.

LYTSwitch-2 V-I graphIt turns out, the reason for the 30mW stand-by is that the ‘ballast’ catagory now includes wall plug power supplies where the switch is often after the power supply – table lamps, for example.

So, good idea Power Integrations. There are too many of these wall plug PSUs sitting there wasting a watt 24/7.

LYTSwitch-2 circuitBy the way, for a primary-side sensed supply, these things have an amazingly square V/I graph – take a look.



Tags: power consumption, power supply

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