LM3444 (dimmable) Bench Circuit I 1 I 4 I 3 I 2. LED Board. 120V AC Power Supply. LM3444 MR16 LED Driver. Transformer ( Electronic ) Triac Dimmer V 4

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1 ,2,3 2 5,6, 7, LM3444 (dimmable) VAC_1 12VAC Input VAC_2 D6 R D1 B340A-13-F D2 B340A-13-F D3 B340A-13-F D4 B340A-13-F R15 15k D10 D11 R k D12 2.7V D13 1 C8 1nF R k Q3 1 D14 2.7V 1 Q4 R13 1R0 Q5 R2 5.49k D7 1 11V Q1 D9 C3 22µF U1 1 ASNS FLTR1 DIM FLTR2 LM3444MM R3 L1 MSS1278T-563MLB 56µH 24.9k BLDR VCC GATE ISNS COFF R k R k Q2 R D5 B340A-13-F R6 open R D8 43V R C5 4.7µF C6 330µF LED+ LED- C9 0.1µF C10 1µF C4 330pF R k Bench Circuit I 1 I 2 I 3 I 4 120V AC Power Supply LINE NEUTRAL V 1 Triac Dimmer V 2 Vp Vp Transformer ( Electronic ) Vs Vs V 3 VIN VIN LED+ LM3444 MR16 LED Driver LED- V 4 LED Board 1

2 Measurement Results Input Voltage Input Current (ma) Input Voltage (V) LED Current (ma) LED Voltage (V) Efficiency (%) 12V DC V AC Osram ET-A60 (220V AC) Remarks: 1. 12V DC Power is supplied by Agilent E3634A 2. 50Hz AC Power is supplied by Kikusui PCR 500LA 3. Efficiency is measured by Agilent 34401A (Measured Power Supply as input, LEDs as output. All system included bridge & LM3492) 2

3 Compatibility Score Card AR-111 LED Lamp score card, on 220VAC LAMP UNDER TEST: LM3444AR111 (BOM120208) Measured full input power: 15W Performance on conduction duty cycle Dimmer E-Transformer 10% 20% 30% 40% 50% 60% 70% 80% 90% 80% 70% 60% 50% 40% 30% 20% 10% Remark Philips ETK50, 50W L L L L L L L L L L Philips ET-E60, 20~60W L L L L L L L L L L F Rio RT50M, 20~50W L L L L L L L L L L L L L L Kengo DET-60T, 10~60W L L L L L L L L L L L L JUNON BTB04-600SL NVC ET60E, 60W L L L L L L L L L L L L F OSRAM ET-PARROT 105, 35~105W L L L L L L L F F F L L L L L L L OSRAM ET-P60 L L L L F F L F F L L L L L F OSRAM HTM 105, 35~105W L L L L L L L F L F L L L L L L L Tridonic VIPER, 60W L L L F L L L F L L L L Wipo ET 105, 35~105W F F L L L L F L F L F L L L L L F Philips ETK50, 50W L L L L L L L L L L Philips ET-E60, 20~60W L L L L L L L L L L F L Rio RT50M, 20~50W L L L L L L L L L L L L L L L Kengo DET-60T, 10~60W L L L L L L L L L L L CLIPSAL KB31RD400 NVC ET60E, 60W F L L L L L L L L L L L L L F OSRAM ET-PARROT 105, 35~105W F L L L L L L L L L L L F OSRAM ET-P60 L L F L L F L L F L L L OSRAM HTM 105, 35~105W L L L L L L L L L L L L L Tridonic VIPER, 60W L L L L L L L L L F F Wipo ET 105, 35~105W L L L L L L L L L L L L L L L Philips ETK50, 50W L L L L L L F L L L L Philips ET-E60, 20~60W L L L L L L L L L L F Rio RT50M, 20~50W L L L L L L L L L L L L L Kengo DET-60T, 10~60W L L L L L L L L L L L L Hager XP515 P60 series NVC ET60E, 60W L L L L L L L L L L L L OSRAM ET-PARROT 105, 35~105W L L L L L F L F L L L L L L L OSRAM ET-P60 L L L F F F F F F F L L L L L OSRAM HTM 105, 35~105W L L L L L L L F L F L L L L L L L Tridonic VIPER, 60W F L F F F L L F L L F L Wipo ET 105, 35~105W F F L L L L L L L L L L L L L F L MEANS "NOT LIGHT UP" MEANS "LIGHT UP WITHOUT FLICKER" MEANS "FLICKERING" SCORE 11/30 3 3

4 Output LED Current (ma) Output Current Linearity % 20% 30% 40% 50% 60% 70% 80% 90% Conduction Duty Cycle (ms) 4

5 LM3492 (Boost + 2 ch. linear LED driver) Integrated boost power switch Integrated 2 ch. linear current regulator Automatic voltage headroom control Wide input voltage range 4.5V-6V 5

6 LM3492 (dimmable) Green color route (quiet ground related) should be kept short. FB net needs to be quiet, keep it away from the SW net. Mind the kelvin sense connection of RL1. 6

7 LM3492 (dimmable) Performance with12vac Specs LM3492 BOOST 6 LEDs Units V IN 12 VAC P IN 6.9 W V OUT VDC I LED A P OUT 5.47 W Efficiency 79.2 % Specs LM3492 BOOST 6 LEDs Units V IN 220 VAC P IN 7.28 W V OUT VDC I LED A P OUT 5.12 W Efficiency 70.3 % Performance with electronic transformer (Philips ETK50) Performance with electronic transformer (RIO RT50M) Specs LM3492 BOOST 6 LEDs Units V IN 220 VAC P IN 7.27 W V OUT VDC I LED A P OUT 5.3 W Efficiency 72.8 % 7

8 LM3492 (dimmable) Electronic Transformer Waveform (RIO RT50M) Electronic Transformer Waveform (Philips ETK50) ILED= 287mA ILED= 278mA V 50Hz AC Power is supplied by Kikusui PCR 500LA 2. Rio RT50M E-Transformer CH1: LED Voltage CH2: LED Current CH3: Output Current from Transformer CH4: Output Voltage from Transformer (100mV * 200 = 20V/div) 8

9 Operation principles of the LM3492 MR16 solution 9

10 Operation principles of the LM3492 MR16 solution Boost LED driver stage 10

11 Operation principles of the LM3492 MR16 solution Current sensor for constant input current regulation and AC dummy load circuit 11

12 Operation principles of the LM3492 MR16 solution Electronic transformer detection and IOUT reference adjustment circuit 12

13 Q&A? 13