CPC9909EB Hi-Brightness, Off-Line LED Driver Evaluation Board User’s Guide INTEGRATED CIRCUITS DIVISION Specifications Parameter Input Voltage AC DC Load Current Efficiency Introduction Min Typ Max Unit - - 265 Vrms 15 - 375 VDC - 90 350 - mA % WARNING! This demonstration board must be powered through an isolation transformer before connecting any external AC instrumentation IXYS IC Division's CPC9909 Evaluation Board contains all the necessary circuitry to demonstrate all the features of CPC9909 High Brightness (HB), Off-Line LED driver. The CPC9909 IC architecture includes pulse frequency modulation (PFM) with a constant peak-current control scheme. This regulation scheme is inherently stable, allowing the driver to operate above 50% duty cycle without open-loop instability or sub-harmonic oscillations. This greatly increases the number of LEDs in series that can be driven by the CPC9909 and by this Evaluation Board. Linear LED dimming can be achieved either by adjusting the on-board potentiometer, RA1, or by adjusting the voltage at the LD pin. In addition, PWM dimming can be achieved with a user-applied TTL-level, low frequency, pulse-width-modulated square wave signal between JP1-1 (GND) and JP1-2 (connected to the PWMD pin of the CPC9909). Figure 1. CPC9909 Evaluation Board, Top View LED - 350mA max LED + VDD Monitor VIN RA1 - External Current Sense Threshold Adj. 90VAC to 265VAC External Power VIN JP1 - External PWMD Control Input UG-CPC9909EB-December 22, 2012 www.ixysic.com LD Monitor 1 INTEGRATED CIRCUITS DIVISION CPC9909 Evaluation Board User’s Guide 1. Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 CPC9909 Evaluation Board Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Demo Board Connection Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 CPC9909 Evaluation Board Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 3 4 2. Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 Typical Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. PC Board Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4. PC Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 www.ixysic.com December 22, 2012 CPC9909 Evaluation Board User’s Guide INTEGRATED CIRCUITS DIVISION 1. Setup 1.1 CPC9909 Evaluation Board Schematic FUSE F2 2A J2 R1 402kΩ BR1 VIN AC 265VAC (max) EXT. POWER AC VDD MONITOR + LD MONITOR DF04S VIN C1 0.1μF 400V D1 BYV26B NTC1 C2 22μF 400V 1 2 2 L1 4.7mH 3 1 Q1 IXTA8N50N J1 R2 51kΩ CPC9909 8-PIN SOIC 4 RT VIN CS LD PGND VDD GATE PWMD 3 8 7 5 R3 0Ω DUT1 LED+ LED CONNECTION LED- RA1 5kΩ 6 1 R4 0.56Ω JP1 2 C3 2.2μF 16V 3 C4 0.1μF 25V PWMD 1.2 Demo Board Connection Descriptions Name Description J1 LED+ LEDJ2 * VIN VIN VDD Monitor LD Monitor JP1 GND LED+ is connected to the anode end of the LED string LED- is connected to the cathode end of the LED string AC input: 265Vrms (max) - or - DC input: 15VDC to 375VDC (not DC polarity sensitive) AC input: 265Vrms (max) - or - DC input: 15VDC to 375VDC (not DC polarity sensitive) This pin is connected to the VDD pin of the CPC9909. The typical voltage regulator output is set at 7.8V, and can be used to provide bias voltage to external circuits. The LD monitor pin is connected to the wiper of the potentiometer, RA1. The CPC9909 has a preset voltage level VCS(high) which is typically set at 250mV. The LED drive current can be reduced in a linear fashion by adjusting RA1, thus pulling the LD pin down to below 250mV. External PWMD Control Input: • Jumper pins 1&2 to disable the CPC9909 and place it into a low-current, standby state. • Jumper pins 2&3 to enable the CPC9909; dimming is accomplished with the potentiometer, RA1. • No Jumper. Apply a TTL-level PWM signal in the 500Hz range to pin 2 to enable dimming under PWM control. The PWM signal’s duty cycle determines LED brightness. This pin is connected to the ground of buck LED driver. * Note that the demo board and the connected LED's are not isolated from line voltage, therefore an isolation transformer should be used to protect the user and all measuring instruments such as oscilloscope and multi-meters. December 22, 2012 www.ixysic.com 3 CPC9909 Evaluation Board User’s Guide INTEGRATED CIRCUITS DIVISION 1.3 CPC9909 Evaluation Board Bill of Materials 4 Designator Qty. Description BR1 C1 C2 C3 C4 D1 DUT1 F1 F2 J1 J2 JP1 1 1 1 1 1 1 1 1 1 1 1 1 IC, Rectifier Bridge, 400V, 1.5A Capacitor, Polarized, 0.5 WD, 22F, 400V Capacitor, Axial, 0.6 x 0.35, 0.1F, 400V Capacitor, 2.2F, 16V Capacitor, 0.1F, 25V BYV26B, 1A, 400V IXYS IC Division CPC9909 Fuse Holder, Thru-Hole, PC Mount Fuse, 2A, 250V 2-Position Terminal Block 2-Position Terminal Block 3-Position Jumper JP2 L1 NTC1 Q1 R1 R2 R3 R4 RA1 TP2 TP3 TP4 1 1 1 1 1 1 1 1 1 1 1 1 Wire Jumper, 0.3 Inductor, Axial, 4.7mH, 0.4A Thermistor, Inrush Current Limiter IXYS FET, With Aavid Thermalloy Heat Sink Resistor, Surface Mount, 402k Resistor, Surface Mount, 51k Resistor, Surface Mount, 0 Ohms Resistor, Surface Mount, 0.56 Variable Resistor, 5k Test Point Test Point Test Point www.ixysic.com Part Number DF04S EXXG401ELL22CMK20S B32652A4104J GRM21BR61C225KA88L GRM216F51E104ZA01D BYV26B-TR CPC9909 5600000100 37312000410 39544-3002 39544-3002 800-10-064-10-001000 w/shunt 929950-00 (Included) 5900-472-RC CL-130 IXTA8N50P w/heatsink 573100D00000 RC0805FR-07402KL RC0805FR-0751K1L RC0805JR-070RL RL1220S-R56-F 3314G-1-502E 10-138-2-01 10-138-2-01 10-138-2-01 December 22, 2012 CPC9909 Evaluation Board User’s Guide INTEGRATED CIRCUITS DIVISION 2. Performance 2.1 Typical Output Waveforms Input Voltage = 110VAC CH3: LED Current, 10mV = 100mA/div CH4: MOSFET drain voltage, 50V/div Frequency = 84kHz, positive duty cycle = 55.4% 3. PC Board Layout Considerations Proper PCB layout should include a short, thick trace from pin 4 of the CPC9909 internal gate driver to the gate of the external power MOSFET. In addition, the current sense resistor, connected to pin 2, and the one-shot programming resistor, connected to pin 8, should be placed as close as possible to pin 2 and pin 8 respectively to minimize any noise coupling to the CS and RT pins. December 22, 2012 Please note that in some cases, during turn-off transitions of the external power MOSFET, high current spikes from the external inductor can develop. In this case, the design may require placing a high voltage capacitor, 100nF or higher, between the LED+ and LED- terminals to filter these current spikes. www.ixysic.com 5 CPC9909 Evaluation Board User’s Guide INTEGRATED CIRCUITS DIVISION 4. PC Board Layout 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 or 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: UG-CPC9909EB-December 22, 2012 ©Copyright 2012, IXYS Integrated Circuits Division All rights reserved. Printed in USA. 12/22/2012 6 www.ixysic.com December 22, 2012