RT7304 Evaluate Report for Bulb Internal Power (Flyback) 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 PWM Controller and High PF LED Driver • 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 3.64% Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 9 CONFIDENTIAL Load regulation Load: LED Series Frequency 60Hz 50Hz Vac [V] 110 230 Vout(60V) Vout [V] Iout [mA] VLED+5% 63.14 124.9 VLED 60.2 125.3 VLED-5% 57.59 126.1 VLED+5% 63.76 125.4 VLED 60.95 126.1 VLED-5% 58.11 126.9 Load regulation 0.95% 1.18% 10 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL PCB layout Top Trace Bottom Trace 11 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Demo board photo Length Width Height 47mm 25mm 18mm PCB No : RT7304_15W_FLYBACK_V1 12 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL BOM Item Location Value Type 1 F1 1A/250V SS-5F-2P 2 LX1,LX2 5.5mH DR0612 3 T1 Lm=1440uH EE-16 4 BD1 TB6S DB-TB6S 5 VR1 7N471K DIP 6 D1 1N4148 SOD-323 7 D2 FFM-107-M SOD-123 8 D3 GS1M SMA 9 D4 ER2J SMB 10 IC1 RT7304 SOT23-6 11 Q1 2SK2623 TO-251 13 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL BOM Item Location Value Type 12 R1,R2 300KΩ 1206 13 R3 150Ω 0805 14 R4 2.7Ω 1206 15 R4A 3.9Ω 1206 16 R5 2KΩ DIP 17 R6 33KΩ 0805 18 R7 5.6KΩ 0805 19 R8 100Ω 0805 20 R9 150KΩ 1206 21 R11 47Ω 1206 22 R12 200KΩ 1206 14 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL BOM Item Location Value Type 23 RX1, RX2 20KΩ 1206 24 R10 100Ω 1206 25 CX1 0.047uF/275V 12.5X6-10MM 26 C1 0.1uF/275V CAP-3X10MM 27 C3 2.2uF/10V 0805 28 C5 2.2nF/1KV 1206 29 C6 100pF/1KV 1206 30 C7 1nF/1KV DIP 31 EC1 10uF/50V EC-5X11 32 EC2 68uF/100V EC-8X20 15 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Transformer 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 600 530 88.33% D1 600 376 62.66% Transient State Location Max rating (V) Measure De-rating Q1 600 530 88.33% D1 600 367 61.16% 17 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Start up waveform Vac_in = 90V T_start up =1.73s Vac_in = 264V T_start up =0.43s 18 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL LED open protection Vac_in = 90V Ch1:VCC ; Ch3:Vzcd ; Ch4:Vout Vac_in = 264V Ch1:VCC ; Ch3:Vzcd ; Ch4:Vout 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. 19 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL LED Short protection Vac_in = 90V Ch1:VCC ; Ch3:Vcs ; Ch4:Vout Vac_in = 264V Ch1:VCC ; Ch3:Vcs ; Ch4:Vout 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. 20 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 21 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 22 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Conduction-EMI 230V-LPass 230V-N Pass 23 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Conduction-EMI 110V-LPass 110V-N Pass 24 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 25 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 26 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.