LMR14050SEVM

User's Guide SNVU468 – February 2015 LMR14050SEVM User's Guide The Texas Instruments LMR14050SEVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMR14050S wide-input Simple Switcher® buck regulator. This document describes the setup and the input / output connections of the EVM. Included are the board layout, schematic, and bill of materials. 1 2 3 4 Contents Introduction ................................................................................................................... Setup .......................................................................................................................... Board Layout ................................................................................................................. Schematic and Bill of Materials ............................................................................................ 2 2 3 6 Trademarks Simple Switcher is a registered trademark of Texas Instruments. SNVU468 – February 2015 Submit Documentation Feedback LMR14050SEVM User's Guide Copyright © 2015, Texas Instruments Incorporated 1 Introduction 1 www.ti.com Introduction The LMR14050S is a 40-V, 5-A step-down regulator with 40-μA quiescent current. With a wide-input range from 4 V to 40 V, it is suitable for a wide range of applications from automotive to industry for power conditioning from unregulated sources. The LMR14050SEVM evaluation board is designed to provide the design engineer with a fully functional power converter based on the buck topology to evaluate the LMR14050 series operation and performance. Figure 1. LMR14050SEVM Board • • • • • EVM Features 7 V to 40 V Input Voltage Range Jumper Selectable Output Options (5.0 V or 3.3 V) Up to 5 A Output Current Switching Frequency 400 kHz Internal Compensation The EVM contains one DC / DC converter (See Table 1) Table 1. Device and Package Configurations 2 CONVERTER EVM IC PACKAGE U1 LMR14050SEVM LMR14050S HSOIC-8 Setup This section describes the jumpers and connectors on the EVM and how to properly connect, set up and use the LMR14050SEVM. 2.1 Input/Output Connector Description VIN — Terminal TP1 – is the power input terminal for the converter. Adjacent to it is the GND reference ground. Use this terminal to attach the EVM to a cable harness. VOUT — Terminal TP3 – is the regulated output voltage for the converter. Adjacent to it is the GND reference ground. GND — Terminal TP2, TP4 – are the ground reference for the converter. Use these terminals to attach the EVM to a cable harness. 2 LMR14050SEVM User's Guide SNVU468 – February 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Setup www.ti.com EN — Jumper J1 – is used to enable the switch-mode converter. The device will be enabled when the respective jumper is high or floating, and disabled when low. EN turn off trip point also can be programmed by changing R1 or R2. Refer to LMR14050S datasheet for enable and adjustable undervoltage lockout. Figure 2. Enable Jumper Setting SYNC — Jumper J2 – is used to synchronize the switching frequency to external clock. Refer to data sheet for detail application information. Testpoint — TP6, TP7, TP8 – these are test points used for loop response measurements. 2.2 Adjusting the Output Voltage The default setting output voltage is 5.0 V. Open J3 will change output voltage from 5.0 V to 3.3 V. If other outputs need to be configured, then: open J3 and adjust the feedback resistors using the following equation. VOUT = VFB ( 1 + ( R5 / R6 ) ) (1) Where VFB is 0.75 V 3 Board Layout Figure 3 to Figure 6 show the board layout for the LMR14050SEVM. The PCB consists of a 4-layer design. 2-oz copper planes are applied on all four layers to dissipate heat with an array of thermal vias under the thermal pad to connect to all four layers. Figure 3. Top Layer SNVU468 – February 2015 Submit Documentation Feedback LMR14050SEVM User's Guide Copyright © 2015, Texas Instruments Incorporated 3 Board Layout www.ti.com Figure 4. Middle Layer 1 Figure 5. Middle Layer 2 4 LMR14050SEVM User's Guide SNVU468 – February 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Board Layout www.ti.com Figure 6. Bottom Layer SNVU468 – February 2015 Submit Documentation Feedback LMR14050SEVM User's Guide Copyright © 2015, Texas Instruments Incorporated 5 Schematic and Bill of Materials 4 www.ti.com Schematic and Bill of Materials Figure 7. LMR14050SEVM Schematic 6 LMR14050SEVM User's Guide SNVU468 – February 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Schematic and Bill of Materials www.ti.com Table 2. LMR14050SEVM Bill of Materials (BOM) Designator Description Part Number Footprint CAP, CERM, 47 μF, 16V, +/-20%, X5R, 1210 GRM32ER61C476ME15L 1206 2 C4 CAP, CERM, 0.1 μF, 16 V, +/- 10%, X7R, 0603 GRM188R71C104KA01D 0603 1 C7 CAP, CERM, 1 μF 25 V, +/- 10%, X7R, 0805 GRM21BR71E105KA99L 0805 1 C8 CAP, CERM, 0.027 μF, 100 V, +/- 10%, X7R, 0603 C0603C273K1RACTU 0603 1 C9 CAP, Alum-Poly, 56 μF, 63 V, +/-20%, 30 mohm, SMD EEHZA1J560P SM_RADIAL_10B MM 1 C1, C2 C10, C11 Quantity CAP, CERM, 4.7 μF, 50 V, +/-10%, X7R, 1210 GRM32ER71H475KA88L 1210 2 C12 CAP, CERM, 0.22 μF, 50 V, +/- 10%, X7R, 0805 GRM21BR71H224KA01L 0805 1 D1 Diode, Schottky, 60 V, 7 A, PowerDI5 PDS760-13 PowerDI5 1 J1, J2, J3 Header, 100 mil, 2x1, Gold, TH TSW-102-07-G-S TSW-102-07-G-S 3 L1 Inductor, 5.5 μF, 10 A, 0.0103 ohm 744325550 WE-HCI 1 R1 RES, 432 k, 1%, 0.1 W, 0603 CRCW0603432KFKEA 0603 1 R2 RES, 86.6 k, 1%, 0.1 W, 0603 CRCW060386K6FKEA 0603 1 R3 RES, 59.0 k, 1%, 0.1 W, 0603 CRCW060359K0FKEA 0603 1 R5 RES, 53.6k, 1%, 0.1 W, 0603 CRCW060353K6FKEA 0603 1 R6 RES, 15.8 k, 1%, 0.1 W, 0603 CRCW060315K8FKEA 0603 1 R7 RES, 49.9 ohm, 1%, 0.1 W, 0603 CRCW060349R9FKEA 0603 1 R8 RES, 23.7 k, 1%, 0.1 W, 0603 CRCW060323K7FKEA 0603 1 Shunt, 100 mil, Flash Gold, Black SPC02SYAN SPC02SYAN 2 Terminal, Turret, TH, Double 1502-2 Keystone1502-2 4 TP6 Test Point, TH, Multipurpose, Red 5010 Keystone5010 1 TP7 Test Point, TH, Multipurpose, Yellow 5014 Keystone5014 1 TP8 Test Point, TH, Multipurpose, Black 5011 Keystone5011 1 U1 IC, 40 V, 5 A, Low IQ, Current Mode, Buck Regulator LMR14050SDDAR HSOIC-8 1 PCB, FR4, 4 Layers, Size 3000 x 3000 mil, Thickness 62 mil SV601143 SH-J1, SH-J3 TP1, TP2, TP3, TP4 PCB SNVU468 – February 2015 Submit Documentation Feedback 1 LMR14050SEVM User's Guide Copyright © 2015, Texas Instruments Incorporated 7 IMPORTANT NOTICE FOR TI DESIGN INFORMATION AND RESOURCES Texas Instruments Incorporated (‘TI”) technical, application or other design advice, services or information, including, but not limited to, reference designs and materials relating to evaluation modules, (collectively, “TI Resources”) are intended to assist designers who are developing applications that incorporate TI products; by downloading, accessing or using any particular TI Resource in any way, you (individually or, if you are acting on behalf of a company, your company) agree to use it solely for this purpose and subject to the terms of this Notice. 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