CDB1500

Power Management CS1500 Digital PFC Controller Ultra high efficiency power factor correction IC NC CS1500 8-Pin SOIC (actual size: 5 mm x 5 mm) DIGITAL TELEVISIONS AC Mains IAC NC CS1500 FB VDD STBY GND GD OVERVIEW FEATURES The CS1500 is a high-performance Variable Frequency •• Ultra High Efficiency Discontinuous Mode, active digital power factor •• Digital EMI Noise Shaping correction (PFC) controller. It features Cirrus Logic’s •• Digital Over-Current Protection EXL Core™ technology that brings digital energy •• Variable Frequency DCM for Light Load Efficiency control innovation which elevates performance and •• Comprehensive On-Chip Protection solves system design challenges in power supplies used in notebook adapters, digital TVs and PCs. Notebook Adapters The unique digital architecture of the CS1500 technology platform at the heart of Cirrus Logic’s commitment to the lowest PFC system costs available. develop innovative solutions that the EMI noise spectrum, thus reducing the conducted EMI filtering size and cost. The feedback loop is closed Cirrus Logic, Inc. through an integrated compensation network within the 2901 Via Fortuna IC, eliminating the need for additional external United States T +1-512-851-4000 Toll-Free +1-800-888-5016 Sales Support North America +1 800-625-4084 Asia Pacific +852 2376-0801 Japan +81 (3) 5226-7757 Europe/UK +44 (90) 1628-891-300 learn more at www.cirrus.com The EXL Core is a digital need for numerous passive components, delivering used to achieve close to unity power factor and shaping Austin, Texas 78746 EXL CORE TECHNOLOGY enables reduced-size EMI filters and eliminates the Variable on-time / variable frequency algorithm is PC Power Supplies Regulated DC Output components. Protection features (such as overvoltage, overpower, open and short circuit protection, overtemperature, and brownout) help protect the device during abnormal transient conditions. help our customers cost effectively create smarter, greener energy products Power Management | C S15 0 0 D i g i ta l P o w e r Fa c t o r C o r r e c t i o n CS1500 uses a proprietary digital control algorithm Conducted EMI Comparison to shape conducted EMI emissions, resulting in significantly reduced EMI filter requirements. 90 CS1500 Digital PFC Leading Analog PFC Digital EMI Noise Shaping consists of three major 75 components: dBuV •• Variable switching frequency °° The average switching frequency is varied with respect to the line voltage spreading EMI Limit 60 45 energy over a wide frequency band. °° The switching frequency is highest at the peak of the input voltage which minimizes peak currents 30 •• Digital Spread Spectrum 100 300 Frequency (kHz) °° Shapes colored noise eliminating EMI noise spikes •• Peak current amplitude spreading 500 Reference Design 90W CS1500 + LLC °° Provides additional spreading and further reduces EMI peaks. Demonstrating ultra high efficiency, the CS1500+LLC reference design provides the best efficiency and smallest EMI filter for power levels Key Values up to 300 W. The Digital EMI Noise Shaping is •• Digital noise shaping dramatically decreases utilized to shape both PFC and 2nd differential the size and cost of the EMI filter and common mode EMI noise. Efficiencies for this •• Variable frequency DCM enables superior design are ~90% with unmatched performance efficiency under all load conditions under all load conditions with considerable power •• Low external component count dissipation advantages under light load and no •• Comprehensive on-chip protection °° Under Voltage Lockout °° Brownout load conditions. This solution can be referenced °° Open Loop °° Over Voltage °° Over Power Reference Design 90W CS1500 + Flyback for the development of high end laptop adaptors, CS1500 Digital PFC + Flyback second stage PC Power, and low profile DTV Power. demonstrates the expected performance of Cirrus Evaluation Modules and Reference Designs •• CDB-CS1500- 100W PFC Only •• CRD-CS1500-FB 75 W Notebook Adapter Reference Design •• CRD-CS1500-LLC 90 W Notebook Adapter Reference Design •• CRD-CS1500-LLC 250 W TV/PC Power Logic new digital energy controller. The combined Reference Design 230W CS1500 + LLC solution allows a simple one layer board and world This reference design demonstrates CS1500’s class efficiencies under all load conditions. unique ability to mitigate EMI noise, even at higher CS1500’s Digital EMI Noise Shaping enables rated power level. Typical power supply designs the simplification and reduction of EMI filter for power levels > 200 W previously required more components allowing for smaller more efficient expensive Continuous Conduction Mode (CCM) designs at any power level. technology, but with Cirrus Logic’s Digital EMI Noise Shaping technology, cost effective Reference Design Discontinuous Conduction Mode (DCM) topologies can scale up to 300 W. Cirrus Logic EXL Core technology enables the optimization of switching -40 to +125 9/6 √ voltages, and load conditions, thus providing users with the optimal energy controller for any PFC Package 7.9 – 17.0 Internal Feedback Compensation 1.9 Gate Driver (Source/Sink) [Ω] √ TJ Op. Range [°C] IC Supply Current [mA] √ VDD Range [V] Peak Current Spreading CS1500 VF-DCM 70 Frequency Spereading Max fSW [kHz] Control Method Part Number frequency and duty cycle, for all power levels, line SOIC-8 enabled product. For the full datasheet, visit www.cirrus.com/support. ©2010 Cirrus Logic, Inc. All rights reserved. Product information is subject to change without notice. Cirrus Logic, Cirrus, the Cirrus Logic logo designs, EXL Core, and the EXL Core logo design are trademarks of Cirrus Logic, Inc. Other brand and product names may be trademarks or service marks of their respective owners. Product Bulletin 823106-0610-PB