RT7306 Evaluation Board

Transcription

1 RT7306 Purpose The RT7306 is a constant current LED driver with active power factor correction. It supports high power factor across a wide range of line voltages, and it drivers the converter in the Quasi-resonant mode to achieve high efficiency. This document explains the function and use of the RT7306 evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements. Table of Contents Purpose... 1 Introduction... 2 Key Performance Summary Table... 3 Schematic & Electrical Characteristics... 3 Bill of Materials(BOM) & PCB Layout... 5 More Information Important Notice for Richtek EVB_RT November

2 Introduction General Product Information The RT7306 is a constant current LED driver with active power factor correction. It supports high power factor across a wide range of line voltages, and it drivers the converter in the Quasi-resonant mode to achieve high efficiency. By using primary side regulation(psr), the RT7306 controls the output current accurately without a shunt regulator and an opto-coupler at the secondary side. RT7306 is compatible with analog dimming. The output current can be modulated by the DIM pin. An in-house design high voltage(hv) start-up device is integrated in the RT7306 to minimize the power loss and shorten the start-up time. The RT7306 embeds comprehensive protection functions for robust designs, including LED open-circuit protection, LED short-circuit protection, output diode short-circuit protection, VDD under-voltage lockout(uvlo), VDD over-voltage protection(ovp), over-temperature protection, and cycle-by-cycle current limitation. Product Feature Tight LED current regulation No opto-coupler and TL431 required Power factor correction(pfc) Compatible with analog dimming Built-in HV start-up device Quasi-resonant Maximum/Minimum switching frequency clamping Maximum/Mimimum on-time limitation Wide VDD range (up to 34V) THD optimization Input-voltage feed-forward compensation Multiple protection features LED open-circuit protection LED short-circuit protection Output diode short-circuit protection VDD UVLO VDD OVP Over-temperature protection Cycle-by-cycle current limitation EVB_RT November

3 Key Performance Summary Table Key Features Number: PCB028_V1 Input Voltage 90~300Vac LED Output Current 920mA LED Output Voltage 36~46V Efficiency > 88% Power factor(pf) > 0.9 Default Marking & Package Type, SOP-8 THD < 10% Other Specifications Current Harmonics (IEC Class C) EMI Conduction/Radiation (EN-55015) Protection LED Open-Circuit Protection LED Short-Circuit Protection Schematic & Electrical Characteristics EVB Schematic Diagram EVB_RT November

4 Electrical Performance Load: LED Series Line filter on Frequency Vac [V] Pin [watt] Vout[V] Iout[mA] Pout [watt] Total Eff. [%] PF Value THD [%] 60Hz % Hz % Hz % Hz % Hz % Hz % Hz % Hz % Hz % Hz % Hz % current regulation = 0.87% Effiency = 1.93% Maximum PFC = Minimum PFC = Load: LED Series Line filter on Frequency Vac [V] Pin [watt] Vout[V] Iout[mA] Pout [watt] Total Eff. [%] PF Value THD [%] 60Hz % Hz % Hz % Hz % Hz % Hz % Hz % Hz % Hz % Hz % Hz % current regulation = 0.97% Effiency = 1.65% Maximum PFC = Minimum PFC = Key Components Temperature Test condition: Burn-in 30min., Ta=25 90Vac/60Hz input 300Vac/50Hz input LX1 CMC, T12.7x7.9x4.9, 45mH 37.8 LX1 CMC, T12.7x7.9x4.9, 45mH 28.1 LX3 DR1016, 2.2mH 66 LX3 DR1016, 2.2mH 37.7 BD1 KBP308G 68.5 BD1 KBP308G 45.1 C1 Film-cap, 0.22uF/500V 58 C1 Film-cap, 0.22uF/500V 51 C6 1206, 1nF/1kV 54.7 C6 1206, 1nF/1kV 53.9 R11,R11A 1206, 300k ohm 57.9 R11,R11A 1206, 300k ohm 57 Q1 MMFT70R380 (With HS) 57.9 Q1 MMFT70R380 (With HS) 81.9 R4A 2W, 0.39 ohm 61.6 R4A 2W, 0.39 ohm 57.2 U1 RT U1 RT T1 (core) PQ-2620, 389uH, D=0.37mm*2, 49.1 T1 (core) PQ-2620, 389uH, D=0.37mm*2, 50.2 T1 (wire) 30Ts, with copper 52.2 T1 (wire) 30Ts, with copper 54.3 EC1 E-cap, 33uF/50V, ZLH 44.4 EC1 E-cap, 33uF/50V, ZLH 48.7 D1 SF56 (R=20//20, C7=220pF) 68.6 D1 SF56 (R=20//20, C=220pF) 68.1 EC2,EC4 E-cap, 220uF/63V, KY 36 EC2,EC4 E-cap, 220uF/63V, KY 35.8 R , 51k ohm 38.9 R , 51k ohm 35.6 Note: The temperature of Q1 could be reduced by using larger heat sink or better spec. EVB_RT November

5 Start-up Time CH4: Vin(AC), CH1: V-LED, CH3: I-LED Condition: input 90Vac/60Hz,output: 46V/920mA Condition: input 300Vac/50Hz,output: 46V/920mA 90Vac/60Hz input, Full load output, Turn on delay time 198ms 300Vac/50Hz input, Full load output, Turn on delay time 135ms Bill of Materials(BOM) & PCB Layout BOM Location Qty Part number Description Package Manufacture BD1 1 KBP308G Bridge, 800V/3A KBP TS CX1, CX2 2 CTX224K310VP15 X1 cap, 0.22uF/310Vac 17Wx15.5Hx7.5Tx15P Cheng Tung CY1, CY2 2 JD102KY5PY1 Y1 cap, 1000pF/400Vac, ±10%,Y5P 12Dx9.5Fx6T Cheng Tung C1 1 FMPP500V224J10S Film cap, 0.22uF/500V, ±5% 13Wx12Hx7.5Tx10P Sungho C B105K250CT 0805, 1uF/25V, ±10%, X7R C0805 Walsin C B104K500CT 0805, 0.1uF/50V, ±10%, X7R C0805 Walsin C B223K500CT 0805, 22nF/50V, ±10%, X7R C0805 Walsin C B220K500CT 0805, 22pF/50V, ±10%, X7R C0805 Walsin C B102K102CT 1206, 1nF/1KV, ±10%, X7R C1206 Walsin C7, C B221K102CT 1206, 220pF/1KV, ±10%, X7R C1206 Walsin D1 1 SF56G Super fast diode, 400V/5A DO-210AD(DO-27) Formosa D2 1 FR107 Fast diode, 1000V/1A DO-41 Formosa D3 1 1N4148W Diode, 100V/150mA SOD-123F Formosa D4 1 BAV21W Diode, 200V/200mA SOD-123F Formosa EC1 1 EKY-630E330MF11D E-cap, 33uF/63V, KY 6.3x11mm NCC EC2, EC4 2 EKY-630E221MJ20S E-cap, 220uF/63V, KY 10x20mm NCC F1 1 MST3.15A300V Fuse, 3.15A/300V 8.35x7.7mm Conquer LX1 1 ACM M LX2 1 MCD M CM choke, 50mH, 0.25mm, 90Ts, 15000ui Drum core inductor, 2.2mH, ±20% T12.7x7.9x4.9 DR1016 Abliss Mag.Layers EVB_RT November

6 Location Qty Part number Description Package Manufacture LX3 1 ACM Y-3A CM choke, 500uH, 0.4mm, 9.5Ts, 12000ui T9x5x3 Abliss Q1 1 MMFT70R380P N-MOSFET, 700V/11A, 0.38 ohm TO-220FT Magna For Q1 1 Heat sink, AL 20Lx13W mm For Q1 1 Screw, M3x6, PHM M3x6 mm R1 1 1/4W, 10K ohm Resistor, 1/4W, 10K ohm, F 1/4W DIP R9 1 1/4W, 97.6K ohm Resistor, 1/4W, 97.6K ohm, F 1/4W DIP R4A 1 2W, 0.39 ohm Resistor, 2W,0.39 ohm, F, S-size 2W DIP RX K ohm Resistor, 1206, 5.1K ohm, F R1206 R2 1 0 ohm Resistor, 0805, 0 ohm, J R0805 R ohm Resistor, 0805, 150 ohm, F R0805 R4 1 2 ohm Resistor, 1206, 2 ohm, F R1206 R K ohm Resistor, 0805, 1.33K ohm, F R0805 R6, R ohm Resistor, 0805, 10 ohm, F R0805 R K ohm Resistor, 0805, 9.31K ohm, F R0805 R11, R11A 2 300k ohm Resistor, 1206, 300K ohm, F R1206 R12, R12A 2 20 ohm Resistor, 1206, 20 ohm, F R1206 R K ohm Resistor, 1206, 51K ohm, F R1206 U1 1 RT7306 PSR dimmable LED driver controller with active PFC SOP-8 T1 1 PQ-2620 XFMR, PQ2620, 380uH PQ-2620 Ricktek EVB_RT November

7 Transformer specification (T1) EVB_RT November

8 Headers Description and Placement Top view Bottom view Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or us at Test Points The EVB is provided with the input/output terminals listed in the table below. Terminal Signal Comment (expected waveforms or voltage levels on test points) L, N Input voltage LED+, LED- Output voltage Input voltage range = 90Vac to 300Vac Input frequency = 50/60Hz Output voltage range = 36V to 46V Output current = 920mA EVB_RT November

9 EVB Layout Top View Bottom View EVB_RT November

10 More Information Over Voltage Protection Condition: input 90Vac/60Hz,output: 46V/920mA CH4: V-LED,CH1: Vdd Condition: input 300Vac/50Hz,output: 46V/920mA OVP level=56.8v OVP level=56.1v Short Circuit Protection Condition: input 90Vac/60Hz,output: 46V/920mA CH4: V-LED,CH1: Vdd, CH3: I-LED Condition: input 300Vac/50Hz,output: 46V/920mA EVB_RT November

11 Current Harmonics Vin=110Vac / 60Hz IEC ITHD 4.261% Order Class C Class D Measured % 78.36% 1.054% % 43.79% 2.489% % 23.05% 1.980% % 11.52% 1.547% 80% % 8.07% 1.265% 70% % 6.83% 1.002% 60% % 5.92% 0.732% % 5.22% 0.523% 50% % 4.67% 0.371% 40% % 4.23% 0.205% 30% % 3.86% 0.149% 20% % 3.55% 0.078% % 3.29% 0.069% 10% % 3.06% 0.039% 0% % 2.86% 0.027% % 2.69% 0.045% % 2.54% 0.063% % 2.40% 0.131% % 2.27% 0.140% Class C Class D Measured Vin=230Vac / 50Hz ITHD 5.147% IEC Order Class C Class D Measured % 78.36% 3.223% % 43.79% 1.930% % 23.05% 1.729% 80% % 11.52% 0.891% 70% % 8.07% 0.803% Class C Class D Measured 60% % 6.83% 1.121% 50% % 5.92% 1.098% % 5.22% 0.772% 40% % 4.67% 0.427% 30% % 4.23% 0.266% % 3.86% 0.432% 20% % 3.55% 0.406% 10% % 3.29% 0.295% 0% % 3.06% 0.163% % 2.86% 0.125% % 2.69% 0.133% % 2.54% 0.106% % 2.40% 0.034% % 2.27% 0.139% EVB_RT November

12 EMI Conduction 110Vac/60Hz, Line your power partner. 110Vac/60Hz, Neutral 230Vac/50Hz, Line 230Vac/50Hz, Neutral EVB_RT November

13 EMI Radiation 110Vac/60Hz, Vertical your power partner. 110Vac/60Hz, Horizontal RT Vac/50Hz, Vertical 230Vac/50Hz, Horizontal EVB_RT November

14 RT7306 For more information, please refer to the related datasheets or application notes from Richtek website Important Notice for Richtek THIS DOCUMENT IS FOR REFERENCE ONLY, NOTHING CONTAINED IN THIS DOCUMENT SHALL BE CONSTRUED AS RICHTEK S WARRANTY, EXPRESS OR IMPLIED, UNDER CONTRACT, TORT OR STATUTORY, WITH RESPECT TO THE PRESENTATION HEREIN. IN NO EVENT SHALL RICHTEK BE LIABLE TO BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES. EVB_RT November