LM27761EVM

User's Guide SNVU506 – December 2015 LM27761EVM User's Guide 1 Introduction The Texas Instruments LM27761EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LM27761 switched capacitor inverter. The EVM contains one LM27761 regulated switched capacitor inverter (See Table 1). For more details and electrical characteristics of this device, see the LM27761 device data sheet (SNVSA85). Table 1. Device and Package Configurations 2 FLASH LED DRIVER IC PACKAGE U1 LM27761 WSON (8 pins) Setup This section describes the jumpers and connectors on the EVM as well as how to properly connect, set up, and use the LM27761EVM. 2.1 Input/Output Connector Description VIN / GND: These are the power input pins for the driver. The pins provides a power (VIN) and ground (GND) connection to allow the user to attach the EVM to a cable harness. EN: This is the jumper used to enable the boost converter (EN pin). The driver will be enabled when the EN pin is high (+) and disabled when it is low (–). VOUT: This is the output pin for the LM27761EVM. Currents up to 250 mA can be drawn from this pin when the input voltage is higher than 2.7 V and lower than 5.5 V. Figure 1. Enable Jumper Settings SNVU506 – December 2015 Submit Documentation Feedback LM27761EVM User's Guide Copyright © 2015, Texas Instruments Incorporated 1 Setup 2.2 www.ti.com Input Voltage The input voltage range for the LM27661 device is 2.7 V to 5.5 V. 2.3 Jumper Configuration For proper operation of the LM27761EVM, the jumpers must be properly configured. The recommended setting, using shorting blocks is: EN to + In this configuration, the device powers up when an input voltage is applied. Once running, current can be pulled from the VOUT connector. Test points are provided for voltage measuring when current is drawn from the LM27761EVM. 2.4 Output Voltage Setting The output voltage of the LM27761EVM is externally configurable. The value of R1 and R2 determines the output voltage setting. The output voltage can be calculated using Equation 1: VOUT = –1.2 V × (R1 + R2)/R2 3 (1) Board Layout Figure 2 and Figure 3 show the board layout for the LM27761EVM. The EVM offers capacitors and jumpers to enable the device and to configure it as desired. The LM27761 dissipates power, especially during high current and high input voltage operation. The EVM layout is designed to minimize temperature rise during operation. Figure 2. Top Assembly Layer 2 LM27761EVM User's Guide SNVU506 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Board Layout www.ti.com Figure 3. Bottom Assembly Layer SNVU506 – December 2015 Submit Documentation Feedback LM27761EVM User's Guide Copyright © 2015, Texas Instruments Incorporated 3 Schematic 4 www.ti.com Schematic Figure 4. LM27761EVM Schematic 4 LM27761EVM User's Guide SNVU506 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Bill of Materials www.ti.com 5 Bill of Materials DESIGNATOR PCB DESCRIPTION MANUFACTURER PART NUMBER Printed Circuit Board Any SV601203 C1 CAP, CERM, 10 µF, 10 V, +/- 20%, X5R, 0603 TDK C1608X5R1A106M C2 CAP, CERM, 1 µF, 25 V, +/- 10%, X5R, 0402 TDK C1005X5R1E105K050BC C3 CAP, CERM, 2.2 µF, 6.3 V, +/- 10%, X5R, 0603 C4 CAP, CERM, 1 µF, 10 V, +/- 10%, X5R, 0402 MuRata C5 CAP, CERM, 10 µF, 10 V, +/- 20%, X5R, 0603 TDK CPOUT GND Taiyo Yuden JMK107BJ225KAHT GRM155R61A105KE15D C1608X5R1A106M Test Point, Miniature, Black, TH Keystone 5001 Test Point, Multipurpose, Black, TH Keystone 5011 J1 Header, 100mil, 3x1, Gold, TH J2 Standard Banana Jack, Insulated, Red J3 BANANA JACK, 15A, Insulated, Nylon,Yellow Samtec Keystone Emerson Network Power 6091 108-0907-001 J4 Standard Banana Jack, Insulated, Black R1 RES, 249 k, 1%, 0.1 W, 0603 Vishay-Dale CRCW0603249KFKEA R2 RES, 499 k, 1%, 0.1 W, 0603 Vishay-Dale CRCW0603499KFKEA SH-J1 Shunt, 100mil, Gold plated, Black Keystone TSW-103-07-G-S 3M 969102-0000-DA TP6 Test Point, Multipurpose, Black, TH U1 Low-Noise Regulated Switched-Capacitor Voltage Inverter, DSG0008A VIN Test Point, Multipurpose, Red, TH Keystone 5010 Test Point, Multipurpose, Yellow, TH Keystone 5014 VOUT Keystone 6092 Texas Instruments SNVU506 – December 2015 Submit Documentation Feedback 5011 LM27761DSGR LM27761EVM User's Guide Copyright © 2015, Texas Instruments Incorporated 5 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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