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 Slide 17 Slide 18 Slide 19 Slide 20 Slide 21 Slide 22 Slide 23 Slide 24 Slide 25 Slide 26 Slide 27 Slide 28 Slide 29 Slide 30 Slide 31 Slide 32 Slide 33 Slide 34 Product List
Secondary Side Switch-Mode Power Supply Control Slide 17

Target applications for the SEA05L are AC adapters or battery chargers with an LED pilot lamp, and switch mode power supplies with an LED pilot lamp. Beyond the obvious CV/CC circuit implementation, a benefit of the device is the LED pilot lamp power consumption is reduced by 77.5% to meet low standby consumption requirements. This is accomplished by pulse driving the LED, using a 12.5% duty cycle in which the LED is being driven. To the eye, it appears to be constantly lit. By doing this, the circuit is not dropping power across a series resistor from the output of the power supply, constantly dissipating lost power. A reasonably bright output is made by pulse width modulating the output of the LED, an advantage where more stringent power supply requirements mean it is necessary to reduce the no-load power consumption.

PTM Published on: 2015-04-06