LMR14203XMKDEMO/NOPB

User's Guide SNVA502B – November 2011 – Revised April 2013 AN-2185 LMR14203/LMR14206 Demonstration Board 1 Introduction The Texas Instruments LMR14203/06 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a variety of applications from automotive to power conditioning of unregulated sources. The LMR14203/LMR14006 demonstration board is designed to provide the design engineer with a fully functional power converter based on the buck topology to evaluate the LMR14203/06 series of buck regulators. The demonstration board comes populated with either the LMR14203XMK or LMR14206XMK, but can easily be modified to accommodate any of the LMR14203/06 regulator ICs. Top View Bottom View Figure 1. LMR14203/LMR14206 Demonstration Board All trademarks are the property of their respective owners. SNVA502B – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2185 LMR14203/LMR14206 Demonstration Board Copyright © 2011–2013, Texas Instruments Incorporated 1 Features 2 Features • • • • • 3 www.ti.com 4.5V to 42V Input Voltage Range 1.2V Output Voltage Up to 300/600 mA Output Current Switching Frequency of 1.25 MHz Internal Compensation Shutdown Operation The demonstration board includes a pull-up resistor to enable the device once VIN has exceeded 1.0V (typ). Using 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. 4 Adjusting the Output Voltage The output voltage can be changed from 1.2V to another voltage by adjusting the feedback resistors using the following equation: VOUT = VFB(1 + (RFBT/RFBB)) (1) Where VFB is 0.765V. For more information on component selection and features, see: • LMR14203 SIMPLE SWITCHER 42Vin, 0.3A Step-Down Voltage Regulator in SOT-23 (SNVS732) • LMR14206 SIMPLE SWITCHER 42Vin, 0.6A Step-Down Voltage Regulator in SOT-23 (SNVS733) 2 AN-2185 LMR14203/LMR14206 Demonstration Board SNVA502B – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated LMR14203 Demonstration Board Schematic www.ti.com 5 LMR14203 Demonstration Board Schematic CB EN REN U1 4 SHDN 5 VIN VIN VOUT L1 2 CB SW FB GND 1 D1 6 3 RFBT CIN CINHF COUTHF COUT RFBB GND GND Figure 2. LMR14203 Demonstration Board Schematic Table 1. Bill of Materials LMR14203 ID Part Number Type Size U1 LMR14203 Buck Regulator SOT-6 Parameters Qty Vendor 1 Texas Instruments L1 NR6045T150M Inductor NR6045 15 µH, 2.3A 1 Taiyo Yuden D1 B260A-13-F Diode SMA 60V, 2 A 1 Diodes Inc CIN GRM32ER72A225KA35L Capacitor 1210 2.2 µF, 100V 1 Murata CINHF, COUTHF C0603C223K3RACTU Capacitor 0603 0.022 µF, 25V 2 Kemet COUT GRM32ER61A476KE20L Capacitor 1210 47 µF, 10V 1 Murata CB C0603C224K4RACTU Capacitor 0603 0.22 µF, 16V 1 Kemet RFBT CRCW06036K04FKEA Resistor 0603 6.04 kΩ, 1% 1 Vishay RFBB CRCW060310K5FKEA Resistor 0603 10.5 kΩ, 1% 1 Vishay REN CRCW06031M00JNEA Resistor 0603 1.0 MΩ, 5% 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 SNVA502B – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2185 LMR14203/LMR14206 Demonstration Board Copyright © 2011–2013, Texas Instruments Incorporated 3 LMR14206 Demonstration Board Schematic 6 www.ti.com LMR14206 Demonstration Board Schematic CB EN REN U1 4 SHDN 5 VIN VIN VOUT L1 2 GND CB SW FB 1 D1 6 3 RFBT CIN CINHF COUTHF COUT RFBB GND GND Figure 3. LMR14206 Demonstration Board Schematic Table 2. Bill of Materials (BOM) LMR14206 4 ID Part Number Type Size U1 LMR14206 Buck Regulator SOT-6 Parameters Qty Vendor 1 Texas Instruments L1 NR6045T150M Inductor NR6045 15 µH, 2.3A 1 Taiyo Yuden D1 B260A-13-F Diode SMA 60V, 2 A 1 Diodes Inc CIN GRM32ER72A225KA35L Capacitor 1210 2.2 µF, 100V 1 Murata CINHF, COUTHF C0603C223K3RACTU Capacitor 0603 0.022 µF, 25V 2 Kemet COUT GRM32ER61A476KE20L Capacitor 1210 47 µF, 10V 1 Murata CB C0603C224K4RACTU Capacitor 0603 0.22 µF, 16V 1 Kemet RFBT CRCW06036K04FKEA Resistor 0603 6.04 kΩ, 1% 1 Vishay RFBB CRCW060310K5FKEA Resistor 0603 10.5 kΩ, 1% 1 Vishay REN CRCW06031M00JNEA Resistor 0603 1.0 MΩ, 5% 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 AN-2185 LMR14203/LMR14206 Demonstration Board SNVA502B – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Quick Setup Procedures www.ti.com 7 Quick Setup Procedures Step 1: Connect a power supply to VIN terminals. Step 2: Connect a load to VOUT terminals. Step 3 EN should be left floating for normal operation. Short this to ground to shutdown the part. Step 4:Set VIN = 24V, with 0A load applied, check VOUT with a voltmeter. Nominal 1.2V Step 5: Apply a 300mA load and check VOUT. Nominal 1.2V Measurements Ammeter A Ammeter A + VOUT GND GND + - Electronic Load - 8 Power Supply VIN Voltmeter V V Voltmeter Evaluation Board Figure 4. Efficiency Measurements Oscilloscope Vo GND Co1 Figure 5. Voltage Ripple Measurements SNVA502B – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2185 LMR14203/LMR14206 Demonstration Board Copyright © 2011–2013, Texas Instruments Incorporated 5 Measurements www.ti.com I I I VIN I I I GND I I I I I I VOUT 75 86 9 10 A B A C B D CE D F E H FJ K L SPARE 46 VOUT SENSE+ 53 VOUT SENSE - 42 VIN SENSE - 13 VIN SENSE+ 2 EN 1 Figure 6. Edge Connector Schematic 6 AN-2185 LMR14203/LMR14206 Demonstration Board SNVA502B – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Typical Performance Characteristics www.ti.com Typical Performance Characteristics Efficiency vs. Load Current LMR14203 80 Efficiency vs. Load Current LMZ14206 80 70 70 60 60 EFFICIENCY (%) EFFICIENCY (%) 9 50 40 30 20 10 0 0.0 50 40 30 20 12Vin 24Vin 0.1 0.2 LOAD CURRENT (A) 10 0.0 Switching Node and Output Voltage Waveforms SNVA502B – November 2011 – Revised April 2013 Submit Documentation Feedback 12Vin 24Vin 0 0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) 0.6 Startup Waveform AN-2185 LMR14203/LMR14206 Demonstration Board Copyright © 2011–2013, Texas Instruments Incorporated 7 Layout 10 www.ti.com Layout Figure 7. Top Layer Figure 8. Top Overlay 8 AN-2185 LMR14203/LMR14206 Demonstration Board SNVA502B – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Layout www.ti.com Figure 9. Bottom Layer Figure 10. Bottom Overlay SNVA502B – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2185 LMR14203/LMR14206 Demonstration Board Copyright © 2011–2013, Texas Instruments Incorporated 9 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. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 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