Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Slide 13 Slide 14 Slide 15 Slide 16 Product List
poe
Both high speed and transistor output optocouplers can be used in PoE applications. The power sourcing unit might have an I2C bus or some other interface between the controller chip and the power control chipset which requires isolation. The data rates used require high-speed optocouplers. Isolating the address line from the controller chip doesn’t require high speed, and standard transistor output optocouplers can be used. In the powered device, such as an IP phone, there can be a DC/DC converter in the feedback loop and isolation can be accomplished with transistor output optocouplers.
PTM Published on: 2009-02-26