LMR10530YSDEVM/NOPB

User's Guide SNVU192A – October 2012 – Revised April 2013 AN-2280 LMR10530 Evaluation Module 1 Introduction The LMR10530 evaluation module is designed to provide the power supply design engineer with a fully functional regulator design using the LMR10530 3MHz switching regulator in an WSON-10 package. The evaluation module is configured to provide an output of 1.2V at up to 3A from an input voltage range of 3V to 5.5V. The printed circuit board consists of 4 layers of copper on FR4 material. The middle layers are solid ground layers with the first middle layer having a small polygon cut out for the VIN node. The intermediate ground layer helps in minimizing the AC current loop. The LMR10530 is thermally tied to the other layers by thermal vias directly underneath the device. This user's guide contains the evaluation module schematic, a quick setup procedure, and a Bill-of-Materials (BOM). For complete circuit design information, see LMR10530 SIMPLE SWITCHER 5.5Vin, 3.0A Step-Down Voltage Regulator in WSON-10 (SNVS814). The module has a Cff capacitor footprint reserved for applications requiring higher VOUT. The Cff cap also helps to minimize the output voltage overshoot during sluggish startup. For suggested cap values, see the LMR10530 datasheet (SNVS814). The module also has a reserved footprint for an additional output cap, Co2, for certain applications requiring more capacitance. The performance of the evaluation board is: • Input Range: 3 to 5.5V • Output Voltage: 1.2V • Output Current: 0 to 3A • Frequency of Operation: 3000 kHz • Board Size: 2.016 × 1.08 inches (51.2 × 27.43 mm) 2 Evaluation Board Schematic VIN Rinc Ren Cin Cinc U1 9 VIND 10 VIND EN 2 EN 1 VINC SW SW 8 SW 7 5 FB 4 NC 11 DAP 3 SGND PGND 6 LMR10530YSD L1 VOUT SW Rfbt Cff Co1 Co2 AN-2280 LMR10530 Evaluation Module 1 D1 Rfbb GND Figure 1. LMR10530 Evaluation Module Schematic All trademarks are the property of their respective owners. SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Powering and Loading Considerations 3 www.ti.com Powering and Loading Considerations Read this entire section prior to attempting to power the evaluation board. 3.1 Quick Start Procedure Step 1: Set the bench power supply current limit to 3A. Set the power supply voltage to 4V. Turn off the power supply output. Connect the power supply to the LMR10530 demo board. Positive connection to VIN and negative connection to GND. Step 2: Connect a load, as high as 3A, to the VOUT terminal. Positive connection to VOUT and negative connection to GND. Step 3: The EN pin should be left open for normal operation. Step 4: Turn on the bench power supply with no load applied to the LMR10530. The VOUT would be in regulation at a nominal 1.2V output. Step 5: Slowly increase the load while monitoring the output voltage, VOUT should remain in regulation as the load is increased up to 3 Amps. The LMR10530 is designed to skip some pulses at very light loads to maintain output voltage regulation. Depending on load levels, the circuit may operate in either discontinuous or continuous conduction mode. Step 6: Slowly sweep the input voltage from 3 to 5.5V, VOUT should remain in regulation with a nominal 1.2V output. 3.2 Starting Up By default, VINC is connected to VIN through a low pass filter to remove any high frequency noise present at the input. EN is connected to VINC through a 100kΩ resistor. A separate logic signal at the EN terminal can be used, if startup and shutdown need to be controlled. The EN pin is tied to VIN to simplify start-up. The pull-up resistor allows the power supply design engineer to toggle EN independently, if desired, and observe the start-up behavior of the LMR10530. 3.3 Adjusting the Output Voltage The output voltage is set using the following equation where Rfbb is connected between the FB pin and GND, and Rfbt is connected between VOUT and FB. VOUT = VFB(1 + (Rfbt/Rfbb)) (1) The feedback voltage VFB is regulated at 0.60V typically. Adjusting the output voltage will affect the performance of the LMR10530. In addition, output capacitors might not be rated for the new output voltage. For more information, see LMR10530 SIMPLE SWITCHER 5.5Vin, 3.0A Step-Down Voltage Regulator in WSON-10 (SNVS814). 2 AN-2280 LMR10530 Evaluation Module SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Powering and Loading Considerations www.ti.com 3.4 Typical Test Setup Figure 2. Efficiency Measurements Oscilloscope VOUT GND Co Figure 3. Voltage Ripple Measurements SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback AN-2280 LMR10530 Evaluation Module Copyright © 2012–2013, Texas Instruments Incorporated 3 Powering and Loading Considerations www.ti.com I I I VIN I I I I I I I I I GND VOUT A B C D E F GND 6 VOUT SENSE+ 5 VOUT SENSE - 4 SPARE 3 VIN SENSE+ 2 EN 1 Figure 4. Edge Connector Schematic 4 AN-2280 LMR10530 Evaluation Module SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Board Images www.ti.com 4 Board Images Figure 5. Top Side SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback AN-2280 LMR10530 Evaluation Module Copyright © 2012–2013, Texas Instruments Incorporated 5 Board Images www.ti.com Figure 6. Bottom Side 6 AN-2280 LMR10530 Evaluation Module SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Typical Performance Characteristics www.ti.com 5 Typical Performance Characteristics Efficiency vs Load Current VOUT = 1.2V Startup 81 VIN = 5.5V 1V/Div EFFICIENCY (%) 78 75 VOUT = 1.2V 500 mV/Div 72 69 Vin = 3.0V Vin = 3.5V Vin = 4.0V Vin = 4.2V Vin = 4.6V Vin = 4.8V Vin = 5.2V Vin = 5.5V 66 63 60 57 IOUT = 3A 2A/Div 100 Ps/DIV 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 IOUT(A) Steady-state (CCM Mode) VIN = 3V, IOUT = 3A Steady-state (DCM Mode) VIN = 5.5V, IOUT = 0.025A VSW VSW 2V/Div 2V/Div VOUT = 1.2V VOUT = 1.2V 20 mV/Div 20 mV/Div 200 ns/DIV 200 ns/DIV Load Transient VIN = 5.5V, IOUT = 0.3A to 3A IOUT 500 mA/Div VOUT = 1.2V 100 mV/Div 100 Ps/DIV SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback AN-2280 LMR10530 Evaluation Module Copyright © 2012–2013, Texas Instruments Incorporated 7 Bill of Materials 6 8 www.ti.com Bill of Materials Part ID Part Value Part Number Manufacturer U1 3MHz 3.0A buck regulator, WSON-10 LMR10530 Texas Instruments L1 1.2µH, 4.6A 7447745012 Wurth Elektronik eiSos Cin 47µF, 10V, X5R, 1206 C3216X5R0J226M TDK Cinc 0.22µF, 25V, X7R, 0603 06033D224KAT2A AVX Co1 47µF, 10V, X5R, 1210 GRM32ER61A476KE20L Murata D1 Schottky, 30V, 3A, 3-4E1A CMS01 Toshiba Rfbt 2.00kΩ, 1%, 1/8W, 0603 CRCW06032K00FKEA Vishay Rfbb 2.00kΩ, 1%, 1/8W, 0603 CRCW06032K00FKEA Vishay Rinc 10.0Ω, 1%, 1/8W, 0603 CRCW060310R0FKEA Vishay Ren 100kΩ, 1%, 1/8W, 0603 CRCW0603100KFKEA Vishay VIN Test Point Loop 5010 Keystone SW Test Point Loop 5012 Keystone GND Test Point Loop 5011 Keystone GND Test Point Loop 5011 Keystone VOUT Test Point Loop 5013 Keystone EN Test Point Loop 5014 Keystone AN-2280 LMR10530 Evaluation Module SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Layout www.ti.com 7 Layout Figure 7. Top Copper Figure 8. Top Overlay SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback AN-2280 LMR10530 Evaluation Module Copyright © 2012–2013, Texas Instruments Incorporated 9 Layout www.ti.com Figure 9. Internal Plane 1 Figure 10. Internal Plane 2 10 AN-2280 LMR10530 Evaluation Module SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Layout www.ti.com Figure 11. Bottom Overlay Figure 12. Bottom Copper SNVU192A – October 2012 – Revised April 2013 Submit Documentation Feedback AN-2280 LMR10530 Evaluation Module Copyright © 2012–2013, Texas Instruments Incorporated 11 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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