ON Semiconductor

Demoboard DN05042/D

200-265 Vac Low Ripple Buck LED Driver

Topology: Buck
Input Voltage (min.): 200.00 V
Input Voltage (max.): 265.00 V
Output 1: 156.00 V / 0.020 A

Original publication on 2013-05-14, revision 1 on


High voltage LEDs such as Philips-Lumileds LuxeonH50−2 offer the opportunity to use a cost effectivenon-isolated topology such as the NCL30002 based CrM LED driver. This design note shows a compelling implementation for a very simple driver for a string of 3 high voltage LED’s with a nominal forward voltage of 50 V per LED. The basic architecture is scalable to higher current LEDs and can support other HV−LEDs on the market.This makes the CrM buck topology an excellentarchitecture as an LED driver for the following reasons: Low RMS Current Stress on the FET and Output Diode since the Current is Much Lower for the HV LEDs and the Duty Cycle is Relatively High Low Current Stress Allows the Use of Smaller FETS and Diodes Leading to Optimum Bill-of-material (BOM) Cost Standard Mass Produced Inductors Can Also Be Used which Further Supports a Cost Effective Design Low Output Current Ripple


  • Operation of the NCL30002 CrM controller for buckoperation is detailed in AND9094D. While that application note describes how the device can be used to implement a high power factor buck implementation, this design note will describe a low ripple configuration.


  Order Code SPEC Product series L
RDC max.
RDC typ.
7447462152 PDF WE-TI Radial Leaded Wire Wound Inductor 1500 0.19 8 6.54 1.4