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Secondary Side Switch-Mode Power Supply Control Slide 16

The SEA05L is a part derived from the SEA05. It is a CV/CC controller but also features a very efficient LED pilot lamp driver. Other features include a wide operating range of 3.5 to 36 V, low quiescent current consumption of 250 µA, and an internal voltage reference of 2.5 V. This provides a voltage control loop accuracy of plus or minus 0.5%, and a current sense threshold of 50 mV. The current loop accuracy is plus or minus 4%, and a low external component count is enabled with an open drain output stage. The device is available in a SOT23-6L package. Typically, to implement a circuit like this a power supply designer would source a voltage reference, a couple of op-amps, then design and implement a low-power LED pilot lamp driver and connect them all together. With the SEA05L just the one IC is necessary. ST has combined all the functions into one package and make the design simpler in addition to giving the user the application information on how to apply it most effectively.

PTM Published on: 2015-04-06