IX9908 Triac-Dimmable Evaluation Board User’s Guide INTEGRATED CIRCUITS DIVISION 1. Introduction WARNING! This demonstration board must be powered through an isolation transformer before connecting any external AC instrumentation IXYS Integrated Circuits Division’s IX9908 Evaluation Board contains all the necessary circuitry to demonstrate the features of the IX9908 single-stage flyback controller in a triac dimmable, high power factor LED driver. The IX9908 IC architecture includes quasi-resonant primary control with an integrated high voltage startup cell. This evaluation board features high power factor, high efficiency and outstanding dimming performance. 1.1 Features: • • • • • • • • TRIAC dimmer compatible, no output flicker or pop-on Fast startup High efficiency >85% Low cost, low component count Open string protection High power factor > 0.9 Digital soft-start Cycle-by-cycle peak current control Figure 1. IX9908 Evaluation Board, Top View 2. Power Supply Specifications Parameter Input Voltage Input Frequency Output Voltage Output Current Efficiency Power Factor IX9908-UG_R01 Symbol Range Units VIN 90-135 VAC f-line Vout Iout 60 Hz 19-26 V 450-600 mA 85-86 % 0.92 min - www.ixysic.com 1 2 SOD323 MM3Z15VT1G D4 J1-2 www.ixysic.com F1 10 NTC R2 E2 E3 R10 82.5k E1 2 E4 2 1 2 R17 5.11k 1 VCC AC INPUT J1-1 1 2 1k 1mH R12 L2 1k 2 1mH R15 L3 2 SOD323 MM3Z4V7T1G D2 1 1 R11 162k 2 1 0.1 C1 1 2 1 C11 0.01 0603 R4 523k 1 BAS16 SOD323 2 Q1 BC857B SOT23 C 3 C13 4.7 R9 12.4k 1 1 B 3 1 2 2 1 D3 R5 523k E2 2 C3 0.033 1/4W-up 510 R1 4 L1 C6 0.22 2 2 ZCV VR CS GD R18 10 C9 330P 0603 1 2 3 4 1 2 1 2 1 R8 20.0k 8 7 6 5 C4 0.22 R7 3.32k GND VCC NC HV U1 1/4W-up 270 R3 1mH 1 VCC 2 + VCC 1 G 2 1 4 2 1 S3 D2 T1-B T1-A 4 3 1 C10 0.1 0603 R19 10 2 1 1 2 T1PIN5 T1-C T1PIN6 D7 BAS16 SOD323 Q2 IPD60R1K4C6 DPAK R16 1.21 R6 221k C7 22 5MM-TH R13 10 1 D1 1N4007GP D0-41 C8 1.5n 1206 2 1 C5 1000pF 10X2.5mm D5 STPS3150U SMB 2 C12 1.0n R14 20k C14 + 0.1 0603 J2-1 C2 330µF 10MM-TH J2-2 LEDs IX9908 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION Figure 2. IX9908 Evaluation Board Schematic R01 IX9908 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION 3. Circuit Description The IX9908 is configured to drive an external MOSFET in a quasi-resonant flyback converter power stage providing a constant current output to a LED string while maintaining high power factor. 3.1 Input Filtering: Fuse F1 provides input overcurrent protection. Diode bridge D3 rectifies the AC line and C4 provides decoupling for the input to the buck converter. L1, L2, L3, C3 and C4 form a 2 stage conducted EMI filter. R12 and R15 provide damping for any resonances between the input inductors, capacitors and the AC line impedance. Damping networks R1-C1 and R3-C6 provide damping of the filter when the circuit is connected to a TRIAC based dimmer. Otherwise the high dv/dt when the TRIAC turns on would create large oscillations in the line current that would commutate the TRIAC before the next zero crossing of the AC line cycle. 3.2 Power Stage: Q2, T1, D5 and C2 form a flyback converter power stage. The IX9908 drives the gate of MOSFET Q2. Current is sensed with R16 and the signal fed back into the IX9908. The IX9908 provide leading edge blanking of the current signal, eliminating the need for an external R-C filter. The AC input voltage is sensed through R4, R5 and R9 and applied to the base of transistor Q1, the emitter of which is connected to the VR pin of the IX9908. The peak current in the primary winding is approximately proportional to the voltage on the VR pin of the IX9908. This causes the input line current to be shaped in a sinusoidal fashion and therefore high power factor is achieved. Line regulation is achieved by the circuitry formed by R18, D6, C13 and R11, as well as the internal foldback correction function of the IX9908. D6 and C13 rectify the bias winding of transformer T1 to produce a negative voltage proportional to the rectified input voltage. This negative voltage is summed into the voltage on the base of Q1 through R11. This stabilizes the voltage at the VR against variations in line voltage. In order to prevent the voltage on VR from going too low, R10, R17 and D4 add a DC offset to the base of Q1. The internal foldback correction circuit senses the input voltage through R8 and the bias winding of the transformer T1. This means that the primary winding current will decrease as the input voltage increases. The amount of the reduction in primary current is adjusted by varying R8. 3.3 Performance Data R01 Number of LEDs in Output String LED String Current LED String Voltage LED String Power Input Power Factor Efficiency 6 7 8 0.568 0.528 0.49 19.34 22.385 25.35 11.0 11.8 12.42 0.948 0.953 0.957 85.3 85.7 85.9 www.ixysic.com 3 IX9908 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION 4. Evaluation Board Bill of Materials 4 Ref. Des. Qty. Description C11 C10, C14 C9 C12 C13 C8 C7 C2 C1 C4, C6 C3 C5 J1, J2 D3 D6, D7 D5 D1 D4 D2 F1 E1, E2, E3, E4 L1, L2, L3 Q2 R2 R13, R18, R19 R9 R11 R8 R7 R4, R5 R10 R16 R17 R12, R15 R14 R6 R3 R1 Q1 U1 T1 1 2 1 1 1 1 1 1 1 2 1 1 2 1 2 1 1 1 1 1 4 3 1 1 3 1 1 1 1 2 1 1 1 2 1 1 1 1 1 1 1 CAP CER 10000PF 50V 10% X7R 0603 CAP CER 0.1UF 50V 10% X7R 0603 CAP CER 330PF 50V 10% X7R 0603 CAP CER 1000PF 200V 10% X7R 0805 CAP CER 4.7UF 10V 10% X7R 0805 CAP CER 1500PF 500V 10% X7R 1206 CAP ALUM 22UF 25V 20% RADIAL CAP ALUM 330UF 35V 20% RADIAL CAP FILM 0.1UF 250VDC RADIAL CAP FILM 0.22UF 250VDC RADIAL CAP FILM 0.033UF 630VDC RADIAL CAP CER 1000PF 500VAC 20% RADIAL CONN TERMINAL BLOCK 2POS 5.08MM RECT BRIDGE GPP 600V 0.8A MBS DIODE SWITCHING 75V 0.2A SOD323 DIODE SCHOTTKY 150V 3A SMB DIODE GEN PURPOSE 1000V 1A DO41 DIODE ZENER 15V 200MW SOD323 DIODE ZENER 4.7V 200MW SOD323 FUSE SLOW 250VAC 1.25A RADIAL STANDOFF HEX 1.00"L 4-40THR NYL INDUCTOR 1000UH .15A RADIAL MOSFET N-CH 600V 3.2A TO252-3 CURRENT LIMITER INRSH 10 OHM RAD RES 10.0 OHM 1/10W 1% 0603 SMD RES 12.4K OHM 1/10W 1% 0603 RES 162K OHM 1/10W 1% 0603 SMD RES 20K OHM 1/10W 1% 0603 SMD RES 3.32K OHM 1/10W 1% 0603 SMD RES 523K OHM 1/10W 1% 0603 SMD RES 82.5K OHM 1/10W 1% 0603 SMD RES 1.21 OHM 1/8W 1% 0805 RES 5.11K OHM 1/8W 1% 0805 SMD RES 1K OHM 1/4W 1% 1206 SMD RES 20K OHM 1/4W 1% 1206 SMD RES 221K OHM 1/4W 1% 1206 SMD RES 270 OHM 1W 5% AXIAL RES 510 OHM 1W 5% AXIAL TRANSISTOR PNP 45V 100MA SOT323 IC LED DRIVER SOIC8 TRANSFORMER Manufacturer KEMET YAGEO YAGEO YAGEO TAIYO YUDEN SAMSUNG ELECTRO-MECHANICS AMERICA, INC NICHICON PANASONIC ELECTRONIC COMPONENTS PANASONIC ELECTRONIC COMPONENTS PANASONIC ELECTRONIC COMPONENTS VISHAY BC COMPONENTS VISHAY BC COMPONENTS MOLEX CONNECTOR CORPORATION COMCHIP TECHNOLOGY ON SEMICONDUCTOR STMICROELECTRONICS MICRO COMMERCIAL CO ON SEMICONDUCTOR ON SEMICONDUCTOR BEL FUSE INC KEYSTONE ELECTRONICS RENCO ELECTRONICS INFINEON TECHNOLOGIES EPCOS INC YAGEO STACKPOLE ELECTRONICS INC PANASONIC ELECTRONIC COMPONENTS PANASONIC ELECTRONIC COMPONENTS PANASONIC ELECTRONIC COMPONENTS YAGEO PANASONIC ELECTRONIC COMPONENTS STACKPOLE ELECTRONICS INC PANASONIC ELECTRONIC COMPONENTS PANASONIC ELECTRONIC COMPONENTS PANASONIC ELECTRONIC COMPONENTS VISHAY DALE PANASONIC ELECTRONIC COMPONENTS PANASONIC ELECTRONIC COMPONENTS NXP SEMICONDUCTORS IXYS ICD RENCO ELECTRONICS www.ixysic.com Mfr. P/N C0603C103K5RACTU CC0603KRX7R9BB104 CC0603KRX7R9BB331 CC0805KRX7RABB102 LMK212B7475KG-T CL31B152KGFNNNE UPW1E220MDD6 EEU-FM1V331 ECQ-E2104KB ECQ-E2224JB BFC233920333 VY1102M35Y5UQ63V0 39544-3002 B6S-G BAS16HT1G STPS3150U 1N4007GP-TP MM3Z15VT1G MM3Z4V7T1G RST 1.25 1902E RL-5480-2-1000 IPD60R1K4C6 B57153S0100M000 RC0603FR-0710RL RMCF0603FT12K4 ERJ-3EKF1623V ERJ-3EKF2002V ERJ-3EKF3321V RC0603FR-07523KL ERJ-3EKF8252V RMCF0805FT1R21 ERJ-6ENF5111V ERJ-8ENF1001V ERJ-8ENF2002V CRCW1206221KFKEA ERG-1SJ271 ERG-1SJ511 BC857BW,115 IX9908N RLIX-1000 R01 IX9908 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION 5. Operating Waveforms 5.1 Output Current with 6 LED string 200mA/DIV 5.2 Drain to source voltage - 6 LEDs R01 www.ixysic.com 5 IX9908 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION 5.3 Output Current with 7 LED string 200mA/DIV 5.4 Drain to source voltage - 7 LEDs 6 www.ixysic.com R01 IX9908 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION 5.5 Output Current with 8 LED string, 200mA/DIV 5.6 Drain to source voltage - 8 LEDs R01 www.ixysic.com 7 IX9908 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION 5.7 Dimming Waveforms using 7 LED string 8 5.7.1 Dimmer full on, upper trace= line voltage, lower trace = LED current 500mA/DIV. 5.7.2 Dimmer on for 6 msec, upper trace= line voltage, lower trace = LED current 500mA/DIV. www.ixysic.com R01 IX9908 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION R01 5.7.3 Dimmer on for 4 msec, upper trace= line voltage, lower trace = LED current 500mA/DIV 5.7.4 Dimmer on for 2 msec, upper trace= line voltage, lower trace = LED current 500mA/DIV www.ixysic.com 9 IX9908 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION For additional information please visit www.ixysic.com IXYS Integrated Circuits Division makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses nor indemnity are expressed or implied. Except as set forth in IXYS Integrated Circuits Division’s Standard Terms and Conditions of Sale, IXYS Integrated Circuits Division assumes no liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. The products described in this document are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to support or sustain life, or where malfunction of IXYS Integrated Circuits Division’s product may result in direct physical harm, injury, or death to a person or severe property or environmental damage. IXYS Integrated Circuits Division reserves the right to discontinue or make changes to its products at any time without notice. Specification: IX9908-UG_R01 Copyright © 2013, IXYS Integrated Circuits Division All rights reserved. Printed in USA. 9/17/2013 10 www.ixysic.com R01