LMR24220EVAL/NOPB

User's Guide SNVA495A – November 2011 – Revised April 2013 AN-2170 LMR24210/20 Evaluation Board 1 Introduction The LMR24210/20 Step Down Switching Regulator features all required functions to implement a cost effective, efficient buck power converter capable of supplying up to 1.0A or 2.0A. The Constant On-Time (COT) regulation scheme requires no loop compensation, results in a fast load transient response and simple circuit implementation, this allows low component count, and consequently very small overall board space. The regulator can function properly even with an all ceramic output capacitor network, and does not rely on the output capacitor’s ESR for stability. The LMR24210/20 has a wide input range from 4.5V-42V, making it suitable for a variety of applications from automotive to power conditioning of unregulated sources. The LMR24210/20 Evaluation Board is designed to provide the design engineer with a fully functional power converter to evaluate the LMR24210/20 series of buck regulators. 2 Features • • • • • • 3 4.5V to 42V Input Voltage Range 3.3V Output Voltage (default setting) Up to 2000 mA Output Current (LMR24220) Up to 1000 mA Output Current (LMR24210) Switching Frequency of 500 KHz (default setting) PCB size: 46.8mm x 27.4mm Enable Option Install R4, R5 and D1 to enable the part at a desider input voltage. A voltage higher than 1.26V on the EN pin will enable the device. 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. Leaving the EN pin open will enable the device at internal UVLO level. 4 Adjusting the Output Voltage The output voltage can be changed from 3.3V to another voltage by adjusting the feedback resistors using Equation 1: VOUT = VFB(1+(R1/R2)) (1) Where VFB is 0.8V. For more information on component selection and features, see the LMR24210 SIMPLE SWITCHER® 42Vin, 1.0A Step-Down Voltage Regulator (SNVS738) and LMR24220 SIMPLE SWITCHER 42Vin, 2.0A Stp-Dwn V-Reg in micro SMD (SNVS737) data sheets. SIMPLE SWITCHER is a registered trademark of Texas Instruments. All other trademarks are the property of their respective owners. SNVA495A – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2170 LMR24210/20 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 1 Adjusting the Output Voltage www.ti.com Figure 1. Top View Bottom View Figure 2. LMR24210/20 Evaluation Board 2 AN-2170 LMR24210/20 Evaluation Board SNVA495A – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Optional components www.ti.com ENABLE T5 Vin = 4.5V ± 42V VOUT VIN C9, C10 (opt) + C1 C8 (opt) R3 R4 (opt) LMR24220/10 T1 RON EN SS D1 (opt) C5 R5 (opt) L1 SW GND T2 C3 BST R1 FB VCC C7 (opt) Vo = 3.3V@2A (or 1A) C2 C6 C4 R2 GND GND T4 T3 Figure 3. LMR24210/20 Evaluation Board Schematic Table 1. Bill of Materials (BOM) LMR24210/20 5 Designation Description Size Manufacturer Part # Vendor C1 Cap 10µF 50V X5R C2 Cap 47µF 10V X5R 1210 UMK325BJ106MMT Taiyo Yuden 1210 GRM32ER61A476KE20L C3,C5,C6 Murata Cap 0.01µF 100V X7R 0603 06031C103MAT2A AVX C4 Cap 1µF 10V X5R 0603 C0603C105K8PACTU Kemet R1 RES, 31.6k ohm, 1%, 0.1W 0603 CRCW060331K6FKEA Vishay R2 RES, 10.2k ohm, 1%, 0.1W 0603 CRCW060310K2FKEA Vishay R3 RES, 49.9k ohm, 1%, 0.1W 0603 CRCW060349K9FKEA Vishay DR74-8R2-R Colitronics 28-ball DSBGA LMR24210/20 TI L1 Shielded Inductor 8.2µH 2.53A U1 IC LMR24210/20 R4,R5 optional C7,C8,C9,C10 optional D1 optional T1,T2 test point (orange) Keystone5013 T3,T4 test point (black) Keystone5011 T5 test point (yellow) Keystone5014 Optional components R4,R5 set the input voltage level at which the device is enabled. D1 is a zener diode that clamps the voltage on the EN pin. A 5.1V zener is suggested. C7 is an additional output capacitor. C8 is an input bulk capacitor. The bulk capacitor should be located near the Power-supply connection point. The purpose of the bulk capacitor is to overcome the inductive effects of bench wiring. C9,C10 are additional input capacitors. SNVA495A – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2170 LMR24210/20 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 3 Test Setup 6 www.ti.com Test Setup Table 2. Demonstration Board Quick Setup Procedures 4 Step Description 1 Connect a power supply to VIN terminals VIN range: 4.5V to 42V 2 Connect a load to VOUT terminals IOUT range: 0A to 2.0A (or 1A) 3 EN should be left floating for normal operation. Short this to ground to shutdown the part 4 Turn on VIN with 0A load applied, check VOUT with a voltmeter Nominal 3.3V 5 Apply a 2.0A (or 1A) load and check VOUT Nominal 3.3V AN-2170 LMR24210/20 Evaluation Board Notes SNVA495A – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Typical Performance Characteristics for LMR24210 www.ti.com 7 Typical Performance Characteristics for LMR24210 Load Regulation 100 0.5 95 0.4 90 0.3 85 0.2 80 75 70 4.5Vin 5Vin 9Vin 12Vin 24 Vin 36Vin 42Vin 65 60 55 50 ûVOUT(%) EFFICIENCY (%) Efficiency vs. Load Current 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 OUTPUT CURRENT (A) Load Transient Waveforms 300mA to 1A, 12VIN 4.5Vin 5Vin 9Vin 12Vin 24Vin 36Vin 42Vin 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 OUTPUT CURRENT (A) Switching Waveforms CCM, 1A, 12VIN VO ripple 5 mV/Div IL 500 mA/Div VO ripple 5 mV/Div VSW 5V/Div IO 500 mA/Div TIME (100 µs/DIV) TIME (1 µs/DIV) Switching Waveforms DCM, 50mA, 12VIN Startup Waveforms IL 500 mA/Div VIN 5V/Div VO 1V/Div VO ripple 10mV/Div IO 200 mA/Div VSW 5V/Div TIME (2 ms/DIV) TIME (5 µs/DIV) SNVA495A – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2170 LMR24210/20 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 5 Typical Performance Characteristics for LMR24220 8 www.ti.com Typical Performance Characteristics for LMR24220 Load Regulation 100 0.5 95 0.4 4.5Vin 5Vin 9Vin 12Vin 24Vin 36Vin 42Vin 0.3 90 0.2 85 80 75 4.5Vin 5Vin 9Vin 12Vin 24 Vin 36Vin 42Vin 70 65 60 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT CURRENT (A) Load Transient Waveforms 300mA to 2A, 12VIN ûVOUT(%) EFFICIENCY (%) Efficiency vs. Load Current 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT CURRENT (A) Switching Waveforms CCM, 2A, 12VIN IL 500 mA/Div VO ripple 10 mV/Div VO ripple 10 mV/Div VSW 5V/DIV IO 1A/Div TIME (100 µs/DIV) TIME (500 ns/DIV) Switching Waveforms DCM, 50mA, 12VIN Startup Waveforms IL 500 mA/Div VIN 5V/Div VO 1V/Div VO ripple 10 mV/Div IO 500 mA/Div VSW 5V/Div TIME (1 ms/DIV) TIME (5 µs/DIV) 6 AN-2170 LMR24210/20 Evaluation Board SNVA495A – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Layout www.ti.com 9 Layout Figure 4. Top Layer Figure 5. Top Silkscreen Figure 6. Mid Layer 1 SNVA495A – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2170 LMR24210/20 Evaluation Board Copyright © 2011–2013, Texas Instruments Incorporated 7 Layout www.ti.com Figure 7. Mid Layer 2 Figure 8. Bottom Layer Figure 9. Bottom Silkscreen 8 AN-2170 LMR24210/20 Evaluation Board SNVA495A – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated 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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