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LM2842XMK-ADJEV/NOPB

LM2842XMK-ADJEV/NOPB

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    -

  • 描述:

    EVAL BOARD FOR LM2842XMK-ADJ

  • 数据手册
  • 价格&库存
LM2842XMK-ADJEV/NOPB 数据手册
User's Guide SNVA377D – March 2009 – Revised April 2013 AN-1908 LM2842 Evaluation Board 1 Introduction The LM2842 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V to 42V, it is suitable for a wide range of applications from automotive to power conditioning from unregulated sources. The LM2842 evaluation board is designed to provide the design engineer with a fully functional power converter based on the buck topology to evaluate the LM2842 series of buck regulators. The evaluation board comes populated with the LM2842XMK-ADJL but can easily be modified to accommodate any of the LM2842 regulator ICs. 2 Features • • • • • • • 3 4.5V to 42V Input Voltage Range 3.3V Output Voltage Up to 600 mA Output Current 89% Efficiency at 300 mA Switching Frequency of 550 kHz Frequency Foldback Current Limit of 1A Internal Compensation Shutdown Operation The evaluation board includes a 3 pin header and a jumper to select whether the device is on or off. Placing the jumper in the "ON" position ties SHDN to VIN and enables the device. Placing the jumper in the "OFF" position ties SHDN to GND and disables the device. The jumper may be removed and a logic signal may be applied to the center pin to test startup and shutdown of the device. 4 Adjusting the Output Voltage The output voltage can be changed from 3.3V to another voltage by adjusting the feedback resistors using the following equation: VOUT = VFB(1+(RFB1/RFB2)) (1) Where VFB is 0.76V. All trademarks are the property of their respective owners. SNVA377D – March 2009 – Revised April 2013 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated AN-1908 LM2842 Evaluation Board 1 Evaluation Board Schematic 5 www.ti.com Evaluation Board Schematic VIN ON 1 2 3 SW OFF CBOOT VOUT L1 VIN LM2842 VIN 5 4 2 CIN VIN CB SHDN SW FB GND 1 30080901 3 RFB1 U1 CIN2 D1 6 COUT COUT2 RFB2 CFB GND1 GND2 Figure 1. LM2842 Evaluation Board Schematic 6 Bill of Materials Table 1. Bill of Materials (BOM) ID Part Number Type Size U1 LM2842 Buck Regulator SOT-6 Qty Vendor 1 Texas Instruments L1 DO3308P-153MLD Inductor 3308 15 µH, 2.0A 1 Coilcraft D1 MA2YD2600L Diode SOD-123 60V, 800 mA 1 Panasonic CIN GRM31CR71H225KA88 Capacitor 1206 2.2 µF, 50V 1 Murata Capacitor 1210 47 µF, 6.3V 1 Murata CIN2 OPEN COUT GRM32ER60J476ME20 COUT2 OPEN CFB OPEN CBOOT VJ0805Y154KXXA Capacitor 0805 0.15 µF 1 Vishay/Vitramo n RFB1 CRCW08053K40FKEA Resistor 0805 3.4 kΩ 1 Vishay RFB2 CRCW08051K02FKEA Vishay ON/OFF 2 Parameters Resistor 0805 1.02 kΩ 1 1X3 header HDR1X3 0.100 Spacing 1 ON/OFF* 382811-6 Shunt VIN, VOUT, GND1, GND2, SW 1502-2 Test Post AN-1908 LM2842 Evaluation Board TP 1502 1 Tyco/Amp 5 Keystone SNVA377D – March 2009 – Revised April 2013 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Typical Performance Characteristics www.ti.com 7 Typical Performance Characteristics VIN = 12V, VOUT = 3.3V, IOUT = 200 mA Top Trace: VOUT, 10 mV/div, AC Coupled Bottom Trace: SW, 5V/div, DC Coupled T = 1 µs/div 100 VIN = 12V EFFICIENCY (%) 80 VIN = 36V 60 VIN = 24V 40 20 0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 LOAD (A) Figure 2. Efficiency vs. Load Current Figure 3. Switching Node and Output Voltage Waveforms VIN = 12V, VOUT = 3.3V, IOUT = 200 mA to 300 mA Top Trace: VOUT, 20 mV/div, AC Coupled Bottom Trace: IOUT, 100 mA/div, DC Coupled T = 200 µs/div VIN = 12V, VOUT = 3.3V, IOUT = 50 mA Top Trace: VOUT, 1V/div, DC Coupled Bottom Trace: SHDN, 2V/div, DC Coupled T = 40 µs/div Figure 4. Load Transient Waveforms Figure 5. Startup Waveform SNVA377D – March 2009 – Revised April 2013 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated AN-1908 LM2842 Evaluation Board 3 Layout 8 www.ti.com Layout Figure 6. Top Layer and Top Overlay Figure 7. Bottom Layer and Bottom Overlay 4 AN-1908 LM2842 Evaluation Board SNVA377D – March 2009 – Revised April 2013 Submit Documentation Feedback Copyright © 2009–2013, 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. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily performed. TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or endorsement thereof. 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TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of non-designated products, TI will not be responsible for any failure to meet ISO/TS16949. 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LM2842XMK-ADJEV/NOPB 价格&库存

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