TPS61158EVM-565

User's Guide SLVU966 – October 2013 TPS61158EVM-565 User’s Guide The Texas Instruments TPS61158EVM-565 evaluation module contains a TPS61158 integrated circuit (IC), helping designers evaluate the operation and performance of the TPS61158, which is a WLED driver providing integrated solutions for single-cell Li-ion battery powered backlight for small and media form factor LCD Display. 1 2 3 4 5 6 7 Contents Introduction .................................................................................................................. 1 Jumper and Connector Setup ............................................................................................. 2 Operation ..................................................................................................................... 3 Board Layout ................................................................................................................ 8 Schematics ................................................................................................................. 11 Bill of Materials ............................................................................................................. 12 Related Documentation From Texas Instruments ..................................................................... 12 List of Figures 1 USB Interface Adapter ..................................................................................................... 4 2 GUI Interface of EasyScale Dimming .................................................................................... 5 3 Operation of EasyScale Dimming......................................................................................... 5 4 Bit Rate Change............................................................................................................. 6 5 Efficiency vs Dimming Cycle, 6 LEDs .................................................................................... 7 6 Efficiency vs Dimming Cycle, 7 LEDs .................................................................................... 7 7 Efficiency vs Dimming Cycle, 8 LEDs .................................................................................... 7 8 Top Assembly .............................................................................................................. Top Layer Routing .......................................................................................................... Bottom Layer Routing ..................................................................................................... TPS61158EVM-565 Schematic.......................................................................................... 8 9 10 11 9 10 11 List of Tables 1 1 Device and Package Configurations ..................................................................................... 1 2 Performance Specification Summary..................................................................................... 2 3 Final Jumper Settings ...................................................................................................... 3 4 TPS61158EVM-565 BOM ................................................................................................ 12 Introduction The EVM contains one DC / DC converter (See Table 1). Table 1. Device and Package Configurations Converter IC Package U1 TPS61158 QFN 2 x 2 6L - DRV Windows is a registered trademark of Microsoft Corporation. All other trademarks are the property of their respective owners. SLVU966 – October 2013 Submit Documentation Feedback TPS61158EVM-565 User’s Guide Copyright © 2013, Texas Instruments Incorporated 1 Jumper and Connector Setup 1.1 www.ti.com Performance Specification Summary The EVM is designed to operate from an input voltage source ranging from 2.7 V - 5.5 V, and provides a 30 mA maximum output current for the LED string. For each single channel, there can be 6 to 8 LEDs in series due to customer’s application. Table 2 provides a summary of the TPS61158EVM-565 performance specifications. All specifications are given for an ambient temperature of 25°C. Table 2. Performance Specification Summary Specification CONDITION VIN supply MIN 2.7 IOUT Number of LEDs in series as the load 2 TYP MAX 5.5 20 JP3 shorted 6 JP4 shorted 7 JP5 shorted 8 UNITS V mA Jumper and Connector Setup This section describes the jumpers and connectors on the EVM and how to properly connect, set up and use the TPS61158EVM-565. 2.1 Input/Output Connector Description J1,J2 – Input are the power input terminals for the converter. The terminal blocks provide a power (VIN) and ground (GND) connection to allow the user to attach the EVM to a cable harness. J3 – USB-TO-GPIO is for the 10-pin ribbon cable that connects the EVM to the USB-TO-GPIO interface box. It is only used when the software is used to EasyScale dimming. JP1 – Output is the output terminal for the converter. The terminal block provides a connection for LED load and it allows the user to add a current meter between its two pins to measure the output current. JP2-CTRL is the jumper used to enable the device and do the dimming. Connecting pin1 and pin 2 will toggle the EN high and enable the device. Connecting pin 2 and pin 3 will toggle the EN low and disable the device. A PWM signal or a controlled digital signal to pin 2 can set the device in dimming mode. JP3, JP4, JP5 – Function has been described in Table 2. 2.2 Hardware Requirements This EVM requires an external power supply capable of providing 2.7 V to 5.5 V at 0.5 A. To change the default current value (that is, implement dimming), the user can apply either a PWM signal to JP2-pin2 or digital control signal to JP2-pin2. 2.2.1 Normal Operation Wthout Dimming Control No additional hardware is required. 2.2.2 PWM dimming A function generator capable of driving the PWM pin with 1.2 V to VIN amplitude and 20-kHz to 100-kHz PWM signal is required for PWM-controlled dimming. 2 TPS61158EVM-565 User’s Guide SLVU966 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Operation www.ti.com 2.2.2.1 One-wire Digital EasyScale The user also can implement EasyScale dimming by using a digital control signal. The EVM kit includes a PC software compact disk(CD) and USB-TO-GPIO interface box which, when installed on a personal computer (PC) and connected to the EVM, allows the user to communicate with the EVM via a GUI interface. The minimum PC requirements are: • Windows® 2000 or Windows™ XP operating system • USB port • Minimum of 30 MB of free hard disk space (100 MB recommended) • Minimum of 256 MB of RAM 2.3 Test Setup The input voltage range for the converter is 2.7 volts to 5.5 volts. A load should be applied to the output terminal for proper operation. 3 Operation 3.1 Non-Dimming Operation (default configuration) For non-dimming operation of the TPS61158EVM-565, JP1, JP2 should be properly configured. The recommended setting using shorting blocks are shown in Table 3. The configuration for JP3 to JP5 is determined by the specific application. Table 3. Final Jumper Settings Reference Designator Setting on Board JP1 Short pin1 and pin2 JP2 Short pin1 and pin2 In this default configuration, the device will power up when power is applied. 3.2 PWM Dimming Operation Remove the jumper on JP2 of default configuration, connect the appropriately configured function generator output between pin 2 and pin 3 (for GND connection) of JP2. The device powers up when VIN power the PWM signal are applied. The recommended PWM signal frequency is from 20 kHz to 100 kHz, and the PWM duty is from 1% to 100%. The regulated output current is directly proportional to the PWM signal duty cycle. 3.3 One-wire Digital EasyScale Dimming Remove the jumper on JP2, prepare a PC running the TPS61158EVM-565 Controller software and USBTO-GPIO interface box, and perform the following steps in any sequence: • Remove the jumper on JP2 of the default configuration. • Connect one end of the USB-TO-GPIO box to the PC using the USB cable and the other end to J3 of the TPS61158EVM-565 using the supplied 10-pin ribbon cable as shown in the following illustration. The connectors on the ribbon cable are keyed to prevent incorrect installation. • Connect the power supply between J1 and J2 and turn on the power supply. • Run the software as explained in the Software Installation and Operation section. SLVU966 – October 2013 Submit Documentation Feedback TPS61158EVM-565 User’s Guide Copyright © 2013, Texas Instruments Incorporated 3 Operation www.ti.com Figure 1. USB Interface Adapter WARNING This EVM has white LEDs that shine brightly. Protective eye wear and/or a diffuser to cover the white LED is recommended. 3.4 Software Installation and Operation If installing from a CD, insert the CD and run Setup.exe; follow all the prompts to install the software. If installing from the TI Web site, go to the URL – http://www.ti.com/product/tps61158 Click on the install button; the PC gives a security warning and asks the user to install this application. Select Install to proceed. If a pre-release or Beta version is currently installed the your PC, then uninstall this version of the software before installing the final version from either the CD or the TI Web site. With both types of installation, the software attempts to install the Microsoft Dot Net Framework 2.0 (if it is not already installed). This framework is required for the software to run. Immediately following installation, the software automatically runs. To run the software after installation, go to Start → all programs → Texas Instruments, Inc. → TPS61158 Controller EVM Software. At start-up, the software first checks the firmware version of the USB-TO-GPIO adapter box. If an incorrect firmware version is installed, the software automatically searches on the Internet (if connected) for updates. If a new update is available, the software notifies the user of the update, and downloads and installs the software. Note that after the firmware is updated, the user must disconnect and then reconnect the USB cable between the adapter and PC, as instructed during the installation process. The host PC software also automatically searches on the Internet (if connected) for updates. If a new update is available, the software notifies the user of the update, downloads and installs the update. 4 TPS61158EVM-565 User’s Guide SLVU966 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Operation www.ti.com NOTE: VeriSign™ Code Signing is used to prevent any malicious code from changing this application. If at any time in the future the binaries are modified, the code will no longer attempt to run. The TPS61158 IC has a 5-bit register that stores the feedback voltage to which the error amplifier will regulate the FB pin. In EasyScale dimming mode, a digital command should be sent to the IC via the CTRL pin to change this register to one of 32 discrete settings; thereby, changing the FB voltage. The software provides a GUI interface in Figure 2 after the software start-up. Figure 2. GUI Interface of EasyScale Dimming The user clicks on the “Enable IC” button to enable the IC and enter the EasyScale dimming mode. If the hardware has already been connected and powered on, moving the slider runs the dimming operation. See Figure 3. Figure 3. Operation of EasyScale Dimming SLVU966 – October 2013 Submit Documentation Feedback TPS61158EVM-565 User’s Guide Copyright © 2013, Texas Instruments Incorporated 5 Operation www.ti.com The default bit transmission rate is 100 kbps, but the software also supports other bit rate options between 10 kbps to 100 kbps. The user can easily change the bit rate directly by a drop-down box. See a screen shot of the software in Figure 4. Figure 4. Bit Rate Change 6 TPS61158EVM-565 User’s Guide SLVU966 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Operation www.ti.com 3.5 Test Results 100% 100% 95% 95% 90% 90% Efficiency (%) Efficiency (%) This section provides typical efficiency for the TPS611158EVM-565 board. 85% 80% 75% VINVin=3v = 3V VINVin = 4.2 V = 4.2 70% 0 20 40 60 80% 75% VINVin=3.6 = 3.6 V VINVin = 5=V5 80 85% 100 Dimming Duty Cycle (%) VINVin=3v = 3V VINVin = 4.2 V = 4.2 70% 0 20 60 80 Dimming Duty Cycle (%) C024 Figure 5. Efficiency vs Dimming Cycle, 6 LEDs 40 VINVin=3.6 = 3.6 V VINVin = 5=V5 100 C024 Figure 6. Efficiency vs Dimming Cycle, 7 LEDs 100% Efficiency (%) 95% 90% 85% 80% 75% VINVin=3v = 3V VINVin = 4.2 V = 4.2 70% 0 20 40 60 VINVin=3.6 = 3.6 V VINVin = 5=V5 80 100 Dimming Duty Cycle (%) C024 Figure 7. Efficiency vs Dimming Cycle, 8 LEDs SLVU966 – October 2013 Submit Documentation Feedback TPS61158EVM-565 User’s Guide Copyright © 2013, Texas Instruments Incorporated 7 Board Layout 4 www.ti.com Board Layout Figure 8, Figure 9 and Figure 10 show the board layout for the TPS61158EVM-565. The EVM offers resistors, capacitors and jumpers. Jumpers are provided to configure the device. The PCB provides 1 oz copper planes on the top and bottom to dissipate heat. Figure 8. Top Assembly 8 TPS61158EVM-565 User’s Guide SLVU966 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Board Layout www.ti.com Figure 9. Top Layer Routing SLVU966 – October 2013 Submit Documentation Feedback TPS61158EVM-565 User’s Guide Copyright © 2013, Texas Instruments Incorporated 9 Board Layout www.ti.com Figure 10. Bottom Layer Routing 10 TPS61158EVM-565 User’s Guide SLVU966 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Schematics www.ti.com 5 Schematics TP1 J1 Vin = 2.7 - 5.5 V 1 2 VIN SW 10uH C1 open J2 R1 10 C2 1uF U1 Vin_ic 1 2 GND 2 R2 PGND 1 5 C5 1uF PGND JP2 VIN CTRL LX VOUT 6 Vomax = 28V TP3 3 Ionom = 20mA Iomax= 30mA Vo 1 2 0 SH-JP2 TP2 L1 Vin GND PAD FB 4 D1 C3 1uF C4 open TPS61158DRV 1 2 3 D3 D4 D5 D6 LOAD PGND EN D2 1 2 PGND PGND D7 D8 JP1 1 2 1 2 SH-JP1 SH-JP3 DISA JP3 6 LED's JP4 7 LED's JP5 8 LED's PGND R3 4.7k 1 2 3 4 5 6 7 8 9 10 J4 1 2 3 4 J3 PGND R4 10.0 PGND PGND Figure 11. TPS61158EVM-565 Schematic SLVU966 – October 2013 Submit Documentation Feedback TPS61158EVM-565 User’s Guide Copyright © 2013, Texas Instruments Incorporated 11 Bill of Materials 6 www.ti.com Bill of Materials Table 4. TPS61158EVM-565 BOM Ref Des Qty Value J3 1 N2510-6002RB Description Package Reference Part Number Manufacturer Connector, Male Straight 2x5 pin, 100mil spacing, 4 Wall 0.338 x 0.788 inch N2510-6002RB 3M J4 1 Header, TH, 100mil, 4x1, Gold plated, 230 mil above insulator 4x1 Header TSW-104-07-G-S Samtec, Inc. JP2 1 Header, 100mil, 3x1, Tin plated, TH Header, 3 PIN, 100mil, Tin PEC03SAAN Sullins Connector Solutions L1 1 Inductor, Shielded Drum Core, Ferrite, 10uH, 1.25A, 0.2 ohm, SMD LPS4018 LPS4018-103MLB Coilcraft Thermal Transfer Printable Labels, 0.650" W x 0.200" H - 10,000 per roll PCB Label 0.650"H x 0.200"W THT-14-423-10 Brady 10uH LBL1 1 R1 1 10 RES, 10 ohm, 5%, 0.063W, 0402 0402 CRCW040210R0JNED Vishay-Dale R2 1 0 RES, 0 ohm, 5%, 0.063W, 0402 0402 RC0402JR-070RL Yageo America R3 1 4.7k RES, 4.7k ohm, 5%, 0.063W, 0402 0402 CRCW04024K70JNED Vishay-Dale R4 1 10.0 RES, 10.0 ohm, 1%, 0.063W, 0402 0402 CRCW040210R0FKED Vishay-Dale SH-JP1, SH-JP2, SHJP3 3 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M TP1, TP2, TP3 3 Red Test Point, TH, Multipurpose, Red Keystone5010 5010 Keystone U1 1 30V WLED Driver with Integrated Power Diode, DRV0006A DRV0006A TPS61158DRV Texas Instruments C1 1 open CAP, CERM, 1uF, 10V, +/-10%, X5R, 0603 0603 C1608X5R1A105K TDK C4 1 open CAP, CERM, 1uF, 50V, +/-10%, X7R, 0805 0805 GRM21BR71H105KA12L MuRata PCB 1 7 Any Related Documentation From Texas Instruments 30V WLED Driver with Integrated Power Diode data sheet (SLVSBR3) 12 TPS61158EVM-565 User’s Guide SLVU966 – October 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. 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