Mr16 Emc Compliant Reference Design

As a supplement to DN86, this design note aims at depicting the essential EMC tests for a stand- alone MR16 lamp with up to three power LEDs in series at 350mA. The LED Driver is simply implemented by a switching buck Regulator employing the ZXLD1350 hysteretic current controller with the ZXSBMR16PT8 dedicated and new full bridge/freewheeling combo extremely low leakage Schottky Diodes Throughout the compliant verification, the driver was operated from a 12Vac source by means of a typical linear step down transformer directly connected to AC mains. For the demonstration purpose, the application circuit diagram along with the part list is presented as a ready-to-use reference design tool. Circuit description In MR16 lamp applications, the hysteretic converter is more preferable than the fixed frequency PWM converter because of the reduced component count and its lower switching frequency that minimizes the radiated emissions. Furthermore, an EMI Filter along with frequency dithering is adequate for conducted emission attenuation as well as better immunity. The LED Driver is simply implemented by a switching buck Regulator employing the ZXLD1350 integrated controller with the ZXSBMR16PT8 dedicated and full bridge/freewheeling combination extremely low leakage Schottky Diodes The controller has an internal Switch that greatly reduces both the PCB size and the component count. Two input energy storage SMD tantalum capacitors; C1+C2, of total value 300uF have been optimized as the minimum capacitance in terms of efficiency and LED current accuracy.
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System diagram of ZXLD1350 MR16 lamp solution with an EMI filter
System diagram of ZXLD1350 MR16 lamp solution with an EMI filter



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