LMR62014,LMR64010 Application Note 2183 LMR62014/LMR64010 Demo Board Literature Number: SNVA500 National Semiconductor Application Note 2183 Marc Davis-Marsh September 22, 2011 Introduction Shutdown Operation The LMR62014 and LMR64010 are high frequency switching boost regulators which offer small size and high power conversion efficiency. The parts operate at a 1.6MHz switching frequency. The primary difference between the LMR62014 and LMR64010 is that the LMR62014 has a higher current internal switch FET (with lower breakdown voltage), while the LMR64010 has a higher voltage FET which handles less current. The LMR64010 targets applications with higher output voltages, while the LMR62014 is intended for applications requiring higher load currents at lower output voltages. This application note describes the demo board supplied to demonstrate the operation of these parts and give information on its usage. The demo board includes a pull-up resistor R3 to enable the device once VIN has exceeded 1.5V. Use the EN post to disable the device by pulling this node to GND. A logic signal may be applied to the post to test startup and shutdown of the device. Features Feedforward Compensation • • The feedforward capacitor CF should be selected to set the compensation zero at approximately 8 kHz. The value of CF is calculated using: • • • • 2.7V to 12V Input Voltage Range 12V Output Voltage, and 450mA Output Current from 5V input supply (LMR62014) 24V Output Voltage, and 125mA Output Current from 5V input supply (LMR64010) Switching Frequency of 1.6 MHz Minimal Component Count Small Solution Size (12mm x 17mm) Adjusting the Output Voltage The output voltage can be changed from 12V/24V to another voltage by adjusting the feedback resistors using the following equation: VOUT = VFB(1+(R1/R2)) Where VFB is 1.23V. LMR62014/LMR64010 Demo Board LMR62014/LMR64010 Demo Board CF = 1 / (2 x π x 8k x R1) The value of CF is calculated after R1 is selected for the output voltage needed for the specific application. For more information on component selection and features see the LMR62014/LMR64010 datasheet. 30171503 30171502 Bottom View Top View FIGURE 1. LMR62014/LMR64010 Demo Board AN-2183 © 2011 National Semiconductor Corporation 301715 www.national.com AN-2183 30171501 FIGURE 2. LMR62014 Demo Board Schematic Bill of Materials (BOM) LMR62014 ID Part Number Type Size U1 LMR62014XMF-ADJ Boost Regulator SOT-23 L1 NR6045T100M Inductor SMD D1 CRS08 Diode C1 GRM21BR71C225KA12L C2 Parameters Qty Vendor 1 NSC 10uH, 2.5A, 0.061 ohm, 1 Sumida S-Flat Schottky, 30V, 1.5A 1 Toshiba Capacitor 0805 Ceramic, 2.2uF, 16V, X7R 1 Murata GRM32ER71H475KA88L Capacitor 1210 Ceramic, 4.7uF, 50V, X7R 1 Murata CF C0603C221J5GACTU Capacitor 0603 Ceramic, 220pF, 50V, C0G/NP0 1 Kemet CHF GRM188R71H223KA01D Capacitor 0603 Ceramic, 0.022uF, 50V, X7R 1 Murata R1 CRCW0603115KFKEA Resistor 0603 115 kΩ 1 Vishay R2 CRCW060313K3FKEA Resistor 0603 13.3 kΩ 1 Vishay 0603 R3 CRCW06031M00JNEA Resistor 1.0 MegΩ 1 Vishay EN 5014 Test Point Loop Yellow 1 Keystone VIN 5010 Test Point Loop Red 1 Keystone VOUT 5013 Test Point Loop Orange 1 Keystone GND 5011 Test Point Loop Black 2 Keystone www.national.com 2 AN-2183 30171501 FIGURE 3. LMR64010 Demo Board Schematic Bill of Materials (BOM) LMR64010 ID Part Number Type Size U1 LMR64010XMF-ADJ Boost Regulator SOT-23 L1 NR6045T100M Inductor SMD D1 CRS04 Diode C1 GRM21BR71C225KA12L C2 Parameters Qty Vendor 1 NSC 10uH, 2.5A, 0.061 ohm, 1 Sumida S-Flat Schottky, 40V, 1.0A 1 Toshiba Capacitor 0805 Ceramic, 2.2uF, 16V, X7R 1 Murata GRM32ER71H475KA88L Capacitor 1210 Ceramic, 4.7uF, 50V, X7R 1 Murata CF C0603C121J5GACTU Capacitor 0603 Ceramic, 120pF, 50V, C0G/NP0 1 Kemet CHF GRM188R71H223KA01D Capacitor 0603 Ceramic, 0.022uF, 50V, X7R 1 Murata R1 CRCW0603243KFKEA Resistor 0603 243 kΩ 1 Vishay R2 CRCW060313K3FKEA Resistor 0603 13.3 kΩ 1 Vishay 0603 R3 CRCW06031M00JNEA Resistor 1.0 MegΩ 1 Vishay EN 5014 Test Point Loop Yellow 1 Keystone VIN 5010 Test Point Loop Red 1 Keystone VOUT 5013 Test Point Loop Orange 1 Keystone GND 5011 Test Point Loop Black 2 Keystone 3 www.national.com AN-2183 Test Setup Step Demonstration Board Quick Setup Procedures LMR62014 1 Connect a power supply to VIN terminals Notes 2 Connect a load to VOUT terminals 3 EN terminal should be left floating for normal operation. Short this to ground to shutdown the part 4 Set VIN = 5V, with 0A load applied, check VOUT with a voltmeter Nominal 11.9V 5 Apply a 450mA load and check VOUT Nominal 11.9V Step Demonstration Board Quick Setup Procedures LMR64010 Notes 1 Connect a power supply to VIN terminals 2 Connect a load to VOUT terminals 3 EN terminal should be left floating for normal operation. Short this to ground to shutdown the part 4 Set VIN = 5V, with 0A load applied, check VOUT with a voltmeter Nominal 23.7V 5 Apply a 125mA load and check VOUT Nominal 23.5V Efficiency Measurements Edge Connector Schematic 30171505 Voltage Ripple Measurements 30171507 30171506 www.national.com 4 AN-2183 Typical Performance Characteristics Efficiency vs. Load Current LMR62014, VOUT = 12V Efficiency vs. Load Current LMR62014, VOUT = 12V 85 95 80 75 85 EFFICIENCY (%) EFFICIENCY (%) 90 80 75 70 0.0 65 60 55 50 65 60 70 45 VIN =5.0V 40 0.1 0.2 0.3 0.4 LOAD CURRENT (A) 0.5 0.00 VIN =3.3V 0.05 0.10 LOAD CURRENT (A) 30171508 30171517 Efficiency vs. Load Current LMR64010, VOUT = 24V 95 95 90 90 85 85 EFFICIENCY (%) EFFICIENCY (%) Efficiency vs. Load Current LMR64010, VOUT = 24V 80 75 70 65 60 80 75 70 65 VIN =12.0V 60 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 LOAD CURRENT (A) 0.000 VIN = 5.0V 0.025 0.050 0.075 0.100 LOAD CURRENT (A) 0.125 30171509 30171518 Load Transient Waveforms LMR62014 IOUT = 33 to 330mA Load Transient Waveforms LMR64010 IOUT = 13 to 125mA 30171510 30171511 5 www.national.com AN-2183 Switching Node and Output Voltage Waveforms LMR62014 Switching Node and Output Voltage Waveforms LMR64010 30171512 30171513 Startup Waveform 30171514 www.national.com 6 AN-2183 Layout 30171515 Top Layer 30171519 Top Overlay 7 www.national.com AN-2183 30171516 Bottom Layer 30171520 Bottom Overlay www.national.com 8 AN-2183 9 www.national.com LMR62014/LMR64010 Demo Board Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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