RT7304 Evaluate Report for Bulb Internal Power (Buck-Boost) ACDC BU / SLM Division Aug. 2015 http://www.richtek.com/LED CONFIDENTIAL RT7304 Brief introduction RT7304 is an active power factor correction controller specifically designed for using as a constant current LED driver. Supporting: Isolation: PSR mode Non-isolation: Buck-Boost mode Applications AC/DC LED lighting driver ……… 2 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL RT7304 Features Primary-Side Regulation LED Driver Controller with Active PFC • Primary Side Regulation(PSR) • Power Factor Correction(PFC) • Critical conduction mode(CRM) • Max/Min switch frequency clamping • Max/Min on time limitation 3 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL RT7304 Advantage • Universal input voltage. (90Vac~264Vac) • Good LED current regulation. • No shunt regulator and photo to achieve the 2 nd regulation. • Protection: a. Open-circuit protection b. Short-circuit protection c. Output diode short-circuit protection d. Vdd under/over voltage protection e. Over temperature protection f . Cycle-by-cycle current limitation g. Excellent PF and THD. Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 4 CONFIDENTIAL Circuit 5 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Electrical Performance 6 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Efficiency 7 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Power Factor 8 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Current regulation Limit in 0.76% Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 9 CONFIDENTIAL Load regulation Frequency 60Hz Vac [V] 110 Vout [V] Iout [mA] 57.06 133 60Hz 110 60.04 132 60Hz 110 63.08 132 50Hz 230 57.04 133 50Hz 230 60.20 131 50Hz 230 63.11 131 Load regulation 0.75% 1.50% 10 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL PCB layout Top silk Bottom Silk Bottom Trace 11 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Demo board photo LED+ N N L L LED- LED- LED+ PCB No : RT7304_BB_Bulb_V2 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 12 CONFIDENTIAL BOM Item Location Value Type 1 F1 T1A/300V SS-5F-2P 2 CX1 0.047uF 12.5X6-10MM 3 L1 6.5mH LD-D8 4 U1 TB8S DB-TB6S 5 C1 0.1uF/450V CF-P10 6 R1 390kohm 1206 7 R2 390kohm 1206 8 EC1 10uF/50V CE-D6.3 9 R15 10ohm 0805 10 D2 FR107 SOD-123 11 C5 2.2uF/25V 0805 12 U3 RT7304 SOT23-6 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 13 CONFIDENTIAL BOM Item Location Value Type 13 R14 120kohm 0805 14 R16 16.9kohm 0805 15 C3 22pF/50V 0805 16 Q1 4A/600V TO-251 17 D5 1N4148 SOD323 18 R8 150ohm 0603 19 R10 1.43ohm 1206 20 R11 3kohm R1WR_P5 21 T1 EE-13 EE-13 22 D3 ES-1J D-SMA 23 R7 33.2ohm 1206 24 C7 220pF/1kV 1206 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 14 CONFIDENTIAL BOM Item Location Value Type 25 EC2 82uF/100V 8X18-H1 26 C4 4.7n/1kV 1206 Total: 26pcs 15 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Optional component Item Location Value Type 1 RV1 7N471K VR-7-5MM 2 R9 0ohm 1206 3 D4 0ohm 0805 4 JP1 7.5mm W7-5 5 C6 2.2nF/1kV 1206 6 R6 150kohm 1206 7 D6 FM4007 SOD-123 Total: 7pcs 16 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Transformer 17 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Power Component Stress Voltage Test condition: 90Vac input / 60V, 130mA output Stead state Location Max rating (V) Measure De-rating Q1 600 253 42.2% D1 600 157 26.2% Transient State Location Max rating (V) Measure De-rating Q1 600 256 42.7% D1 600 162 27.0% 18 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Power Component Stress Voltage Test condition: 264Vac input / 60V, 130mA output Stead state Location Max rating (V) Measure De-rating Q1 600 508 84.7% D1 600 364 60.7% Transient State Location Max rating (V) Measure De-rating Q1 600 512 85.3% D1 600 370 61.7% 19 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL LED open protection Vac_in = 90V Ch2:Vout ; Ch3:Vzcd ; Ch4:Vdd Vac_in = 264V Ch2:Vout ; Ch3:Vzcd ; Ch4:Vdd When LED open , the output keeps rising and causing the VZCD rising accordingly. If Vzcd trigger the protected level(2.9V~3.3V), the IC latch down. IC will be auto-restarted when the output is recovered. 20 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL LED Short protection Vac_in = 90V Ch2:Vout ; Ch3:Vgate ; Ch4:Vcs Vac_in = 264V Ch2:Vout ; Ch3:Vgate ; Ch4:Vcs When LED short , the output level is 0V and the Vcs will rise to trigger the protected function. IC will be auto-restarted when the output is recovered. 21 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Harmonic(IEC61000-3-2) 110V input Class C : Pass Class D : Pass 22 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Harmonic(IEC61000-3-2) 230V input Class C : Pass Class D : Pass 23 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Conduction-EMI 230V-LPass 230V-N Pass 24 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Conduction-EMI 110V-LPass 110V-N Pass 25 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Radiation-EMI 230V-V Pass 230V-H Pass 26 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Radiation-EMI 110V-V Pass 110V-H Pass 27 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.