DN05021/D High Efficiency - Low Cost LED Dimming http://onsemi.com DESIGN NOTE Circuit Description needs to be that of the threshold voltage when the input voltage to the circuit is at the minimum conduction angle. Also some dimmers require 20 mA of loading current so the NSI50010 can be replaced with an NSI45020AT1G, but expect extra power losses. This circuit can be thought of as having two separate portions. There is a LED management portion and there is a dimmer management and PWM Signal portion. The LED management portion charges the output capacitor to a “DC” state. The dimmer management portion provides loading current for an SCR in a dimmer and provides a gate voltage to the series pass MOSFET. The gate drive of the series MOSFET PWMs the LEDs at their peak current rating. The NSIC2050 Constant Current Regulators provides over current and over voltage protection to the LEDs. The NSI5010 limits the power consumption of the dimmer management circuit. For optimal performance the gate voltage of the MOSFET (driven by the voltage divider of the 11 kW and 1.5 kW) Key Features Over 80% Efficiency Below 3.61 W Dimming a Function of the Dimmer’s Range Extremely Low BOM Cost Works with a Wide Variety of Dimmers Table 1. DEVICE DETAILS Device Application Input Voltage Output Power Topology I/O Isolation NSIC2050 NSI5010 AC LED Dimmable 100−127 Vac 6W Cap Drop and PWM Sensing No 270 kW, 0.25 W 1.6 mF, 200 V 2x BAS21SL 100 V−127 V 60 Hz NSIC2050 3.3 mF 250 V 100 W 2W 60 V MTD6N20ET4G 1.5 kW 0.25 W BAV23CL 11 kW 1/2 W BZX84C15LT1G NSI50010 Figure 1. CCR with Dimmable Interface Semiconductor Components Industries, LLC, 2013 January, 2013 − Rev. 1 1 Publication Order Number: DN05021/D DN05021/D Table 2. OTHER SPECIFICATIONS Output Unit Output Voltage 60 V Ripple 100 % Nominal Current 63 mA rms Max Current 106 mA Min Current 0 mA PFC (Yes/No) No Minimum Efficiency 80% Inrush Limiting/Fuse N/A (100 W, 2 W) IRMS(IN) 100 VRMS 127 VRMS 46.46 mA 55.09 mA PF 0.589 0.514 THD 43.97% 45.6% IRMS(OUT) 55 mA 63 mA P(in) 2.69 W 3.6 W Manufacturer Serial Number Notes Lutron 500−15591A Smooth Dim Below 40% Lutron TGCL−153PH Smooth Dim Below 5% Lutron CTCL−153PDH Smooth Dim Below 5% Pass & Seymour 450 W − CFL/LED Smooth Dim Below 5% Pass & Seymour 700 W Incandescent Small Dead Travel *This list is complied from a limited selection of Dimmers. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. 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