RT7304 Evaluate Report for T8 Edge Version (Buck-Boost) ACDC BU / SLM Division Apr . 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 : EMI part 5 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Circuit : Controller part CONFIDENTIAL Electrical Performance 7 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Efficiency 8 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Power Factor 9 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Current regulation 10 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Load regulation 11 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL PCB layout : EMI part Top View Bottom View 12 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL PCB layout : Controller part Top View Bottom View CONFIDENTIAL Demo board photo N LED- L LED+ EMI part Controller part LED+ L LED- N RT7304_Buck-Boost_V1 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 14 CONFIDENTIAL BOM Item Location Value Type 1 F1 T2A/275V SS-5F-2P 2 VR1 TVR10471 VR-10-5MM 3 VR2 TVR10471 VR-07-5MM 4 LX1 5mH LD-D9 5 LX2 5mH LD-D9 6 BD1 TBS10 TB-6S 7 IC1 RT7304GE SOT23-6L 8 Q1 ISD04N60A TO-252 9 D1 WS1N4148 SOD-323 10 D2 BAV21 SOD-123 11 D3 1N4007 DO-41 12 D4 SFM28-M SMB Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 15 CONFIDENTIAL BOM Item Location Value Type 13 T1 1.1mH RM6 14 RX1,RX2 4.7KΩ 1206 15 R1,R2 300KΩ 1206 16 R3 150Ω 0805 17 R4 0.75Ω MOF 1/2W 18 R4A 20Ω 0603 19 R5 1.2KΩ 0805 20 R6 33KΩ 0805 21 R7 4.7KΩ 0805 22 R8 100Ω 0805 23 R9 150KΩ MF 1/2W 24 R11 47Ω 1206 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 16 CONFIDENTIAL BOM Item Location Value Type 25 R12 200KΩ 1206 26 CX1 0.1uF/275V X2 27 C1 0.1uF/450V CP-10MM 28 C3 2.2uF/10V 0805 29 C4 2.2nF/1KV 1206 30 C5 100pF/1KV 1206 31 C6 4.7nF/630V 1206 32 EC1 10uF/50V 5X11.5-H1 33 EC2 68uF/100V 8X18-H1 17 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Transformer 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/50Hz input , 60V/270mA output Stead state Location Max rating (V) Measure De-rating Q1 600 514 85.67% D1 600 335 55.83% Transient State Location Max rating (V) Measure De-rating Q1 600 520 86.67% D1 600 340 56.67% 19 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: V-ZCD, Ch4: V-OUT Vac_in = 264V CH1:VCC, CH3: V-ZCD, Ch4: V-OUT 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 CH1:VCC ,CH3:V-CS ; CH4:V-OUT Vac_in = 264V CH1:VCC ,CH3:V-CS ; CH4:V-OUT 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 24 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Conduction-EMI 230V-N Pass 25 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Conduction-EMI 110V-LPass 26 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Conduction-EMI 110V-N Pass 27 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 28 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 29 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. CONFIDENTIAL Surge (IEC61000-4-5) Surge Line to Line 3.5KV 4 phase Pass 30 Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.