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TPS92210: 0-10V dimming ratio

Part Number: TPS92210
Other Parts Discussed in Thread: PMP6023


I noted that the 0-10V dimming ratio is 9:1. what does this mean?

are there many methods of 0-10V dimming or is it always an isolated interface using an opto-coupler to transfer the signal to control the reference voltage?

is the 0-10V dimming circuitry integrated in our 0-10V dimming devices or always external system level circuitry?