DN05022/D Low-Cost LED Dimming with Output Capacitor http://onsemi.com DESIGN NOTE Table 1. DEVICE DETAILS Device Application Input Voltage Topology I/O Isolation NSIC2050B, NSI50010Y AC LED, Dimmable 100−127 Vac Bridge + CCR and PWM Sensing No Circuit Description current through the LEDs. The NSI50010Y 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 resistors) needs to be equal to the threshold voltage when the input voltage to the circuit is at the dimmer’s minimum conduction angle. Also, some dimmers may require more than 10 mA of loading current, so the NSI50010Y may be replaced with another CCR such as the NSIC2020B (20 mA CCR), though power consumption will increase. This circuit can be thought of as having two separate portions. There is an LED management portion and a dimmer management/PWM Signal portion. The LED management portion charges the output capacitor to run the LEDs in a “DC” state. The dimmer management portion provides loading current for the TRIAC 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 NSIC2050B Constant Current Regulators regulate the 2 × NSIC2050B 2 × BAS21SL Vin 100 W 2W 3.3 mF 250 V 60 V 1.5 kW 1/4 W NSI50010Y 3 × Cree MX−6S MTD6N20E BAV23CL 11 kW 1/2 W BZX84C15L Figure 1. LED Lighting with CCRs, Dimmable Interface © Semiconductor Components Industries, LLC, 2013 October, 2013 − Rev. 2 1 Publication Order Number: DN05022/D DN05022/D Key Features • PF = 0.8 • THD = 53.8% • High Light Output • Dimming a Function of the Dimmer’s Range • Low BOM Cost • Dimmable Table 2. CIRCUIT DATA Circuit Data VRMS(IN) 100 VRMS 127 VRMS IRMS(IN) 112 mA 118 mA PF 0.847 0.800 THD 44.2% 53.8% P(in) 9.53 W 12.1 W Table 3. DIMMERS TESTED Manufacturer Serial Number Lutron 500−15591A Lutron TGCL−153PH Lutron CTCL−153PDH Pass & Seymour 450 W – CFL/LED 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. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: [email protected] N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5817−1050 http://onsemi.com 2 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative DN05022/D