LM26003 Evaluation Board National Semiconductor Application Note

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

LM26003 Evaluation Board National Semiconductor Application Note

Datasheet Thumbnail

Top Searches for this datasheet

LM26003 Evaluation Board
LM26003 Evaluation Board
National Semiconductor Application Note 1884 Frederik Dostal August 2008
LM26003 evaluation board designed demonstrate capabilities LM26003 switching regulator. LM26003 board, schematic shown Figure configured provide output 3.3V from input range 38V. nominal operating frequency synchronized from +30% -20% nominal using SYNC connection post. evaluation board designed operate ambient temperatures 75°C. Typical evaluation board waveforms performance curves shown Figure through Figure Figure Figure show trace layout. design evaluation dc/dc buck converters based LM26003 regulator, evaluation board re-configured different output voltages operating frequencies. Test points also provided enable easy connection monitoring critical signals. more information about device function circuit design, refer LM26003 datasheet.
with single resistors respectively. However, large changes default settings require other changes inductor, output capacitor compensation network. Several optional component pads have been provided application flexibility. provided additional ceramic output capacitor, This capacitor used filter noise output line prevent noise from coupling into Vbias line when supplied Vout. Vbias function used, necessary. phase lead capacitor which installed increase phase gain margin. compensation section datasheet more detailed information. resistor used injection point loop stability measurement. populated with resistor. higher resistor value used this location build filter combination with bypass capacitor.
Jumper Settings
FPWM jumper used disable sleep mode function. normal operation, select `off' which connects FPWM GND. FPWM operation (sleep mode disabled), select `on'. Vbias jumper connects VBIAS Vout. When Vout greater than VBIAS function will activated improved efficiency. disable VBIAS, Vout less than jumper `GND'.
Powering
Before powering LM26003 evaluation board, external connections should verified. power supply input must turned connected with proper polarity posts. load should connected between VOUT post post. Both VOUT connections should post closest VOUT. Output voltage monitored with oscilloscope VOUT post. Once connections have been verified, input power applied. load startup. post left open, output voltage will ramp when applied.
Optional Components
Before changing default components, please refer product datasheet information regarding component selection. Output voltage frequency easily adjustable
AN-1884
30074201
FIGURE Evaluation Board Schematic
2008 National Semiconductor Corporation
300742
www.national.com
AN-1884
TABLE LM26003 Bill Materials VOUT 3.3V, Value ceramic ceramic ceramic ceramic ceramic ceramic 6.3V ceramic ceramic installed installed Schottky 5.0A WE-PD 56.2 33.2 12.1 LM26003 12x12mm 0603 (inch) 0603 (inch) 0603 (inch) 0603 (inch) 0603 (inch) 0603 (inch) 0603 (inch) 0603 (inch) TSSOP-20 Footprint 1206 (inch) 0603 (inch) 0603 (inch) 0603 (inch) 0603 (inch) 0603 (inch) 5.3x5.3mm 1206 (inch) 1812 (inch) 10.3x10.3mm Supplier Nippon Chemi-Con Panasonic Central Semiconductor Wurth National Semiconductor Part Number C3216X5R1A106M C1608X7R1H104K C1608SL1A223J VJ0603A221JXQCW1BC VJ0603Y472JXQCW1BC C1608X7R1H104K APXE6R3ARA121ME61G C3216X5R1A106M C4532X7R1H685M EEE-FK1J101P CMSH 5-40 744770115 CRCW060356K2FKEA CRCW060333K2FKEA CRCW060312K1FKEA CRCW0603200KJNEA CRCW0603124KFKEA CRCW060310K0JNEA CRCW06030000Z0EA CRCW060320R0JNEA LM26003MH
www.national.com
AN-1884
Performance Characteristics
Unless otherwise specified, 12V, 25°C
30074205
30074206
FIGURE Load Transient Response (IOUT 0.4A step)
FIGURE Efficiency IOUT (VBIAS VOUT)
30074207
FIGURE Sleep Mode Threshold Load Current Input Voltage
www.national.com
AN-1884
Board Layout
30074208
FIGURE Side Layout
30074209
FIGURE Bottom Side Layout
www.national.com
AN-1884
www.national.com
LM26003 Evaluation Board
Notes
more National Semiconductor product information proven design tools, visit following sites
Products Amplifiers Audio Clock Conditioners Data Converters Displays Ethernet Interface LVDS Power Management Switching Regulators LDOs Lighting PowerWise Serial Digital Interface (SDI) Temperature Sensors Wireless (PLL/VCO) www.national.com/amplifiers www.national.com/audio www.national.com/timing www.national.com/adc www.national.com/displays www.national.com/ethernet www.national.com/interface www.national.com/lvds www.national.com/power www.national.com/switchers www.national.com/ldo www.national.com/led www.national.com/powerwise www.national.com/sdi www.national.com/tempsensors www.national.com/wireless WEBENCH Analog University Notes Distributors Green Compliance Packaging
Design Support www.national.com/webench www.national.com/AU www.national.com/appnotes www.national.com/contacts www.national.com/quality/green www.national.com/packaging www.national.com/quality www.national.com/refdesigns www.national.com/feedback
Quality Reliability Reference Designs Feedback
CONTENTS THIS DOCUMENT PROVIDED CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. NATIONAL MAKES REPRESENTATIONS WARRANTIES WITH RESPECT ACCURACY COMPLETENESS CONTENTS THIS PUBLICATION RESERVES RIGHT MAKE CHANGES SPECIFICATIONS PRODUCT DESCRIPTIONS TIME WITHOUT NOTICE. LICENSE, WHETHER EXPRESS, IMPLIED, ARISING ESTOPPEL OTHERWISE, INTELLECTUAL PROPERTY RIGHTS GRANTED THIS DOCUMENT. TESTING OTHER QUALITY CONTROLS USED EXTENT NATIONAL DEEMS NECESSARY SUPPORT NATIONAL'S PRODUCT WARRANTY. EXCEPT WHERE MANDATED GOVERNMENT REQUIREMENTS, TESTING PARAMETERS EACH PRODUCT NECESSARILY PERFORMED. NATIONAL ASSUMES LIABILITY APPLICATIONS ASSISTANCE BUYER PRODUCT DESIGN. BUYERS RESPONSIBLE THEIR PRODUCTS APPLICATIONS USING NATIONAL COMPONENTS. PRIOR USING DISTRIBUTING PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING OPERATING SAFEGUARDS. EXCEPT PROVIDED NATIONAL'S TERMS CONDITIONS SALE SUCH PRODUCTS, NATIONAL ASSUMES LIABILITY WHATSOEVER, NATIONAL DISCLAIMS EXPRESS IMPLIED WARRANTY RELATING SALE AND/OR NATIONAL PRODUCTS INCLUDING LIABILITY WARRANTIES RELATING FITNESS PARTICULAR PURPOSE, MERCHANTABILITY, INFRINGEMENT PATENT, COPYRIGHT OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS PRIOR WRITTEN APPROVAL CHIEF EXECUTIVE OFFICER GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices which intended surgical implant into body, support sustain life whose failure perform when properly used accordance with instructions provided labeling reasonably expected result significant injury user. critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness. National Semiconductor National Semiconductor logo registered trademarks National Semiconductor Corporation. other brand product names trademarks registered trademarks their respective holders.
Copyright© 2008 National Semiconductor Corporation
AN-1884
most current product information visit www.national.com
National Semiconductor Americas Technical Support Center Email: support@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Technical Support Center Email: europe.support@nsc.com German Tel: 5010 English Tel: 4288 National Semiconductor Asia Pacific Technical Support Center Email: ap.support@nsc.com National Semiconductor Japan Technical Support Center Email: jpn.feedback@nsc.com

LM26003 Evaluation Board National Semiconductor Application Note

Top Searches for this datasheet

Other recent searches