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IRS 2548 D LED Driver IC PFC and Half Bridge driver combo Peter Green IRS 2548 D LED Driver IC PFC and Half Bridge driver combo Peter Green – LED Group Mgr Energy Saving Products Business Unit April 2011 COMPANY CONFIDENTIAL

LED Lighting Introduction Small LEDs developed in 1960 s for indication High Brightness / LED Lighting Introduction Small LEDs developed in 1960 s for indication High Brightness / High Power LEDs now available Lumens per Watt better than Incandescent / Halogen lamps Lumens per Watt equal or better than Fluorescent or HID lamps HB/HP LEDs being adopted in general illumination Typical applications; bulb replacements, light fixtures, Street lamps LEDs have longer operating life, typically 50000 hours LEDs offer better reliability / durability LEDs are easier to control and dim LEDs offer reduced Lumen depreciation (less light output reduction over time) LEDs are normally DC driven LEDs are driven by constant current COMPANY CONFIDENTIAL

High Power LED Applications LED Street Light Typically 120 W per cobra head Example High Power LED Applications LED Street Light Typically 120 W per cobra head Example opposite uses 4 x 30 W LED panels One LED driver per cobra head Typically 1. 4 A output Single or multi channel output Optimize for efficiency (series LED connection) or redundancy (4 channel output) High Lumen output / directed light Controllable light output (PWM or linear dimming) Galvanically isolated low voltage outputs (safety) Open and short circuit protected Wide input voltage range 90 to 305 VAC High power factor and low THD COMPANY CONFIDENTIAL

Power Factor Control is Power Quality · “Power Factor” · Relationship between voltage and Power Factor Control is Power Quality · “Power Factor” · Relationship between voltage and current waveforms · Measure of “power quality” that affects transmission network efficiency · PFC regulations apply to: · China · Europe : IEC 1000 -3 -2 · Japan · : China Compulsory Certificate (CCC) : JIC C 61000 -3 -2 For products >75 W (>26 W for lighting applications) COMPANY CONFIDENTIAL 4

IRS 2548 D Critical conduction mode (Cr. CM) PFC Control THD reduction by on IRS 2548 D Critical conduction mode (Cr. CM) PFC Control THD reduction by on time modulation Variable frequency oscillator (current controlled) Half bridge driver PWM dimming input (ENN) also disables PFC Over current protection (PFC and Half bridge) Fixed internal 1. 6 u. S half bridge (HO and LO) dead time Internal bootstrap MOSFET Internal 15. 6 V zener clamp diode on VCC Micropower startup (250 u. A) Latch immunity and ESD protection Maximum half bridge offset voltage 600 V Gate drive output current (PFC, HO, LO) +/-0. 5 A 14 lead SOIC package For LED driver and SMPS applications (typically > 50 W) For wide AC input voltage range 90 to 305 VAC COMPANY CONFIDENTIAL

IRS 2548 D Target Applications Handheld LED Lamps OFF LINE LED LIGHT FIXTURES AUTOMOTIVE IRS 2548 D Target Applications Handheld LED Lamps OFF LINE LED LIGHT FIXTURES AUTOMOTIVE LCD Back Light Fluorescent Replacement Incandescent Replacement HID Replacement Handheld Devices COMPANY CONFIDENTIAL

Two Stage LED Driver IRS 2548 D PFC + Half Bridge Driver IC Combo Two Stage LED Driver IRS 2548 D PFC + Half Bridge Driver IC Combo IC Solution COMPANY CONFIDENTIAL

IRS 2548 D Typical Schematic Frequency Control Input Bus Voltage Feedback Half Bridge MOSFETs IRS 2548 D Typical Schematic Frequency Control Input Bus Voltage Feedback Half Bridge MOSFETs PFC MOSFET OPTO ISOLATOR (Feedback) Rectifier Diodes/MOSFETs Voltage and Current Feedback COMPANY CONFIDENTIAL

IRS 2548 D Demo Board IRPLLED 5 Features: High output current regulation 90 -305 IRS 2548 D Demo Board IRPLLED 5 Features: High output current regulation 90 -305 VAC universal input Dimmable with 1 -10 V DC input Non-latched shutdown against output over-voltage Using IRS 2548 DS LED control IC COMPANY CONFIDENTIAL

Test Results Load: 2 x Eco Lumens EPAD connected in series Pin (W) PF Test Results Load: 2 x Eco Lumens EPAD connected in series Pin (W) PF THDi (%) Fs (k. Hz) Vout (Vdc) Iout (Adc) Pout (W) Eff (%) 100 55. 1 0. 999 2. 3 42. 8 39. 2 1. 22 47. 8 86. 8 120 55. 4 0. 998 6. 4 42. 8 39. 1 1. 23 48. 1 86. 8 220 55. 0 0. 979 13. 1 42. 8 39. 1 1. 24 48. 5 88. 2 240 55. 1 0. 972 15. 6 42. 8 39. 1 1. 24 48. 5 88. 0 277 55. 5 0. 952 18. 3 42. 8 39. 1 1. 25 48. 9 Driving 32 x Samsung Sunnix 6 HPLED packs Total Power = 55 W 88. 1 VACin (Vrms) COMPANY CONFIDENTIAL

Output V-I Characteristic Green = LED Voltage Blue = LED Current Open circuit voltage Output V-I Characteristic Green = LED Voltage Blue = LED Current Open circuit voltage < 60 V Current ripple ~15% Short circuit current = 1. 5 A COMPANY CONFIDENTIAL

Multi Channel LED Concept IRS 2548 D Based Power Stage One main power converter Multi Channel LED Concept IRS 2548 D Based Power Stage One main power converter supplies 48 V isolated DC bus Wide input voltage range 90 to 305 VAC High power factor and low THD Output modules provide 2 x 700 m. A regulated current outputs COMPANY CONFIDENTIAL

IRS 2548 D IC Summary For LED driver and SMPS applications (typically > 50 IRS 2548 D IC Summary For LED driver and SMPS applications (typically > 50 W) For wide AC input voltage range 90 to 305 VAC High Power Factor and Low THD Resonant Half Bridge Topology / Soft Switching Efficiency better than 85% above 50 W Efficiency improves at higher power levels Suitable for isolated LED drivers > 50 W Efficiency and flexibility surpasses Flyback solution above 50 W Protected against short circuit in primary and secondary stages Enables regulated output current loop for LED driving Incorporates PWM dimming input, allows dimming to ~2% output COMPANY CONFIDENTIAL