Application Note 1646 ISL97649A, ISL97649B Evaluation Board Manual Description Quick Setup Guide The ISL97649AIREVALZ and ISL97649BIREVALZ are evaluation boards for the ISL97649A and ISL97649B, respectively. The ISL97649A, ISL97649B are DC/DC voltage regulators for TFT-LCD displays, with screen sizes up to 20". The devices integrate a boost converter, logic LDO (for ISL97649A only), VON slice circuit, supply monitor circuit, and a high performance VCOM amplifier with DCP (Digital Controlled Potentiometer). Some key features and capabilities of the ISL97649A, ISL97649B devices and evaluation boards are: Step 1: Connect the power supply between headers of VIN and PGND. The positive output of the power supply should be connected to VIN header. Set the power supply voltage between 2.5V and 5.5V, and current limit at 4A. 1. Deliver up to 450mA current for the TFT-LCD AVDD supply used by various ICs including the source/column driver ICs. 2. Use an LDO to generate a low voltage needed by external digital circuitry (ISL97649A only). 3. Generate VON (gate high) and VOFF (gate low) voltages used by the TFT-LCD panel row/gate driver ICs. 4. Generate a modulated VGH_M output for the gate high voltage, with desired delay time and discharge slope controlled by the VON slice circuit. Step 2: Connect the positive and negative inputs of the electronic load to AVDD header and AVDD_GND, respectively. The load current should not exceed the maximum output current in Table 1. Step 3: Connect JP5 to tie FREQ pin to VIN to set 1.2MHz switching frequency. Disconnect JP5, FREQ is internally pulled to ground to set 600kHz. Step 4: Connect pin 2 of JP6 to pin 1 to tie EN pin to VIN (default setting) or VLOGIC to enable the part. Connect pin 2 of JP6 to pin 3 to pull EN pin to ground through R21 to disable the IC. Step 5: Connect pin 2 of JP7 to pin 1 to tie VIN pin of IC to board VIN, or connect pin 2 of JP7 to pin 3 to tie VIN pin of IC to LDO_VIN. 5. VCOM voltage calibration for setting the TFT-LCD pixel common bias voltage. The DCP uses an I2C interface and has EEPROM to store the final value. An integrated high performance amplifier drives the calibrated TFT-LCD VCOM voltage. Step 6: Connect JP4 to connect LDO_VIN to VIN, or connect headers of LDO_VIN to a separate power supply. Set the power supply voltage between 2.5V and 5.5V. 6. Assert/de-assert a RESET signal at power-ON/OFF Step 8: Connect an electronic load between headers of VON and VIN_GND. The positive input of the electronic load should be connected to VON header, the negative input of the electronic load should be connected to VIN_GND. Connect the electronic load between headers of VOFF and VIN _GND. The positive input of the electronic load should be connected to VIN_GND header, the negative input of the electronic load should be connected to VOFF. Set the load current values in the electronic load. The values of VON and VOFF at different loadings are shown in Table 2. The ISL97649AIREVALZ and ISL97649BIREVALZ evaluation board provide jumpers that allow users to select either 600kHz or 1.2MHz switching frequency, and to enable or disable the IC. Related Documents ISL97649A, ISL97649B datasheet Ordering Information PART # DESCRIPTION ISL97649AIREVALZ Evaluation Board for ISL97649A ISL97649BIREVALZ Evaluation Board for ISL97649B Step 7: Connect JP2 to use AVDD boost output as the external charge pump input. Step 9: Connect pin 2 of JP3 to pin 1 to connect VDIV to a resistive divider between VIN and GND, or connect pin 2 to pin 3 to connect VDIV to a resistive divider between VLOGIC and GND. Step 10: Connect JP1 to connect VON to VGH. What is Needed The following instruments will be needed to perform testing: Step 12: Connect ISLUSBCEVAL1Z to the ISL97649 Evaluation Board at U2 location. Then, connect USB cable between Personal Computer’s USB port and ISLUSBCEVAL1Z for USB to I2C communication. • Power supplies • DC Electronic load (E-Load) • Multimeters Step 13: Make sure all connections to the Evaluation Board are correct, then turn on the power supply followed by the electronic load. The part will power-ON and start operating. • Oscilloscope • Resistors • Cables and wires April 4, 2013 AN1646.2 Step 11: Connect input from signal generator between headers of VFLK and SGND. Select square waveform with an amplitude of 3.3V and frequency of 50kHz. 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2012, 2013. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. Application Note 1646 AVDD Maximum Output Current The internal MOSFET typical peak current limit is 1.5A (Note 1). This limits the maximum AVDD continuous output current that the ISL97649A/B Boost Converter can deliver to the load. Maximum AVDD continuous output current in an actual application may vary depending on component variations. Feedback compensation parameters, input and output capacitance of the boost converter may need to be modified in order to achieve the stability with maximum peak inductor current of 1.5A. Table 1 shows the maximum AVDD continuous output current IOMAX at different VIN and AVDD voltages. TABLE 1. TYPICAL MAXIMUM OUTPUT CURRENT AVDD (V) IOMAX (mA) (Note 1) 3.3 8 450 3.3 12 310 5.0 8 730 5.0 12 460 1. Typical peak current and maximum continuous output current values are based on 1.2MHz boost switching frequency and 10µH inductor. The ISL97649AIREVALZ and ISL97649BIREVALZ evaluation board generates VON and VOFF voltages using unregulated charge pumps. The VON and VOFF voltages generated are based on the AVDD output. Table 2 shows different values of VON and VOFF with different AVDD voltages, loading conditions, and charge pump (CP) configurations for 1.2MHz switching frequency. TABLE 2. TYPICAL VON AND VOFF FOR DIFFERENT LOADING VOFF (V) AVDD = 8V AVDD = 8V AVDD = 12V SINGLE DUAL SINGLE STAGE CP STAGE CP STAGE CP AVDD = 8V AVDD = 12V 1 15.2 23.4 23.8 4.3 4.4 5 15.1 23.2 23.3 4.3 4.3 10 14.7 23.0 23.2 4.2 4.3 2 • WinXP or newer with 512MB of RAM • 10MB of free hard disk space • An unused USB port Notes This application note contains screenshots of the GUI at the time this user guide was written. Subsequent GUI versions may appear differently. Software Installation VON and VOFF at Different Loading Conditions (mA) Computer Requirements The GUI software was developed on a 32-bit Windows XP platform. Because the GUI software registers as a Human Interface Device (HID) and uses standard HID calls, it should also work on other XP or later Windows operating systems (32-bit and 64-bit), including Windows 7. NOTES: ILOADING The next section explains how to install the graphical user interface (GUI) software, which is used to configure the ISL97649A/B register and EEPROM. • Administrator privileges VIN (V) VON (V) ISL97649A/B Evaluation Software The following steps explain how to install the ISL97649AIREVALZ, and ISL97649BIREVALZ software to a PC. The ISL97649A and ISL97649B software installation steps are the same (the following examples show ISL97649A) and will install the drivers and user interface. Step 1: Download the installer file to the PC. The installer file is named “ISL97649A_Installer_vX.Y”, where “X.Y” is the version number (e.g., v1.2). The installer file may be provided from Intersil on a CD with the evaluation kit, or as an email attachment. Step 2: Run the installer file Step 3: Follow the installation wizard to install the evaluation software to the PC AN1646.2 April 4, 2013 Application Note 1646 When the installer file is run, the window in Figure 1 will appear. Read the License Agreement, and accept or not accept. To move on with installation, the user has to accept to the License Agreement, and click Next to proceed to Select Destination Location (Figure 3). FIGURE 1. INSTALLER WINDOW Choose Next to proceed to the License Agreement (Figure 2). FIGURE 3. SELECT DESTINATION LOCATION The default directory is C:\Program Files\Intersil\ISL97649A HID. To specify a directory different from the default location, click the Browse button. Click Next to continue to the Select Start Menu Folder (Figure 4). FIGURE 2. LICENSE AGREEMENT FIGURE 4. SELECT START MENU FOLDER 3 AN1646.2 April 4, 2013 Application Note 1646 To specify a folder different from the default, click the Browse button. Click Next to create the Intersil folder in the Start menu and proceed to the Ready to Install window (Figure 5). USB Module Installation When the ISLUSBCEVAL1Z-REV.A USB module is initially connected to the PC, Windows XP may display the Found New Hardware pop-up messages (Figure 8). FIGURE 5. READY TO INSTALL Click Install to complete the installation. When Install is clicked, the following Setup dialog box (Figure 6) will prompt the user to either select to install or not install some required ActiveX controls required by the GUI. Depending on the Windows operating system and controls already installed, these may or may not be required. Click Yes to install the controls during the software installation, or No to only install the software. These controls can always be installed later by re-running the installer. FIGURE 8. FOUND NEW HARDWARE The messages mean the USB module has been identified and is registering itself as a HID on your computer. The process should complete within a few seconds. On XP systems, the following pop-up message may appear, displaying the status of the USB module hardware (Figure 9). FIGURE 9. HARDWARE INSTALLED NOTIFICATION FIGURE 6. SETUP HID USB Module If a Found New Hardware window appears asking for the location of device drivers, please contact Intersil for a new USB module. The ISL97649AIREVALZ, ISL97649BIREVALZ board will be shipped with an Intersil HID USB Module - ISLUSBCEVAL1Z REV.A (Figure 7). FIGURE 7. HID USB MODULE 4 AN1646.2 April 4, 2013 Application Note 1646 Using the Software OPEN/RUN THE SOFTWARE Once the software is installed on the PC, go to the location where the Start Menu folder was installed (default location is: Start Menu\Programs\Intersil\ISL97649A HID) and launch the program. Prior to loading/opening the main Graphical User Interface (“GUI”) form, the software will check that an Intersil HID USB module is connected to the PC. If the module is not connected a dialog box will pop-up (Figure 10) to indicate that the board is not found. Check that the USB cable and an Intersil HID USB module are properly connected. Choose Retry to try again. If the connection is good, the GUI form will be opened (Figure 11). However, the GUI can be opened without the USB module attached. To do this, choose Cancel in the dialog box. Once the GUI form opens, the HID Module Status button (labeled “CONNECT”) will be GREEN in color if the HID USB module is connected, or RED if it is not connected. Note, if a new module is connected, or a module is unplugged and then reconnected after launching the software, the button color will not change dynamically. The software does not continuously poll to check for the USB module connection. If connection is lost, to re-establish, click the CONNECT button. FIGURE 10. USB CONNECTION ISL97649A GUI ISL97649B GUI FIGURE 11. ISL97649A, ISL97649B GUI WINDOWS 5 AN1646.2 April 4, 2013 Application Note 1646 SOFTWARE FEATURES AND BUTTONS The ISL97649A/B software has various features and options making it flexible and easy to use for evaluation of the ISL97649. The following is a list of the software interface features, buttons, and options and how to use them effectively. Read from Data Register: Click on this button, a dialog box will pop-up to prompt selection of reading from WR or reading from IVR. The software allows selection between the 8-bit register and 7-bit register. The controls of the GUI operate as follows (refer to Figure 11 to identify the controls). Display Mode: Choose the Display Mode for the register value/data by clicking on the radio button. HEX = hexadecimal, DEC = decimal. 7/8-bit Mode (ISL97649A only): Choose if DCP/calibration operation is 127 step (7-bit) or 256 step (8-bit) resolution. DCP Register Slider: Adjusting this slider will automatically send an I2C transaction to change the WR register value only (not EEPROM) - when the value is changed, the “Write to EEPROM” button will begin to flash indicating that the new register value differs from the EEPROM. To directly move the vertical slider position: • Click on the Up/Down arrows of the vertical slider bar to increment the count by 1. The new code is reflected in the DCP Value text box. • Click-hold on the vertical slider bar and drag it to a new position. The new code is reflected in the DCP Value text box. • Click anywhere on the vertical slider bar. Clicking above the current bar level will increment the value by 16dec (0x10). Clicking below the current bar level will decrement the value by 16dec (0x10). FIGURE 12. INDICATE TYPE OF READ OPERATION Click “Yes” to read directly from WR register value only; click “No” to load IVR (EEPROM) to the WR then read the value; click “Cancel” to abort. HID Module Status: Click this button to check the USB connection. If the connection is good, the button turns GREEN, if not it will turn RED. DCP Calculator: The calculator tool allows finding the expected calibration range and POS voltage based on known resistor values, or finding resistor values based on a desired calibration range. The calculator determines a theoretical voltage at the POS pin, actual VCOM output may vary slightly due to amplifier offset. Help: Clicking “?” will open a dialog box with additional information about how to use the IC and GUI. To directly change the DCP text box value (i.e., DCP register code) click in the text box to put focus in the box. Then, either highlight the digit to be changed, or highlight and change all digits. The software pauses briefly between each keyboard key stroke to make sure nothing more will be entered, then it accepts the value to the software. The new code is reflected on the vertical slider position. Press “Enter” on the PC keyboard to send the I2C transaction. Also, once focus has been put on the slider or text entry box (by clicking), there are keyboard commands that quickly make deterministic adjustments to the value: • Page Up key: increments the DCP value by 16dec (0x10) • Page Down key: decrements the DCP value 16dec (0x10) • Up Arrow key: increments the DCP value by 1 • Down Arrow key: decrements the DCP value by 1 Write to EEPROM: Click on this button will write the existing DCP register value into IVR (i.e., EEPROM). 6 AN1646.2 April 4, 2013 Application Note 1646 Evaluation Board Design Schematic JP5 VIN JP6 AVDD 2 C6 C5 C410uF/25V C7 JP7 C20 MBRM120T3 PGND C3 C2 C1 OPEN 10uF/6.3V 10uF/6.3V 15nF R12 5.5K 0.1uF OPEN VIN 1 10uH C27 10uF/25V 10uF/25V 2 L1 LX 73.2K Vin 0 R19 C32 0.1uF/6.3V OPEN D1 OPEN R1 R28 0 R29 C34 LX AVDD R2 8.06K OPEN 1 10K C30 C29 OPEN 3 3 R21 C36 0.1uF/6.3V 24 C21 22nF 23 25 27 26 28 LDO_VIN AVDD GND JP4 LDO_VIN C25 SS FREQ FB COMP VIN 1 LX EN U1 L_IN 22 CD2 1uF/25V C26 2 CE 100pF 4 100K RE JP1 RESET VGH VGH_M D3 BAT54S C24 U2 19 RESET 6 ADJ VGHM VDIV VFLK NEG 18 OPEN 85K C17 1nF/16V RSET POS SDA 1 VIN VOUT R22 22K R8 133K R9 10K R13 100K OPEN SDA SCL I2C Interface Board GPM_LO MMBT3906 1 R6 1k C16 1uF/16V AVDD 1 D4 BAT54S JP3 RSET C22 3 2 R7 83K 100KR26 C15 0.1uF/25V Q1 VDIV R27 0 2 R15 115K C18 0.47uF/25V C11 0.1uF/25V 15 14 VFLK 10 13 C8 47nF/25V R3 C23 OPEN VOUT 39K R14 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 C35 R18 17 ISL97649A SCL C10 47nF/25V 12 LX VDPM C12 VON 1uF/25V 3 3 8 C9 1uF/25V 11 C33 0.1uF/25V AVDD 7 GPM_LO 1500pF 2 9 1 10 2 R17 82.5K 10K C13 1 AVDD VLOGIC_GND VLOGIC 2.2uF/10V RESET R16 5 OPEN L_OUT 20 3 R5 R4 D2 BAT54S 21 1nF 3 1 JP2 CD2 C14 0.1uF/50V C28 VGH PGND AVDD 2 1 2 0 R30 SGND C19 0.47uF/25V R10 VOFF OPEN R11 OPEN Z1 MMSZ5231B VIN VIN SDA SCL SDA R24 OPEN SCL C31 Z2 R25 OPEN OPEN Title OPEN Size Number Revision B Date: File: Layout Recommendation The device performance (including efficiency, output noise, transient response and control loop stability) is dramatically affected by the PCB layout. PCB layout is critical, especially at higher switching frequency. Here are some general guidelines for layout: 1. Place the external power components (input capacitors, output capacitors, boost inductor and output diodes, etc.) in close proximity to the device. Traces to these components should be kept as short and wide as possible to minimize parasitic inductance and resistance. 2. Place VIN bypass capacitors close to the pins. 3. Shorten the trace length from the LX pin to the FB pin. Place the L1 inductor and D1 diode as close as possible to the LX pin in order to minimize the voltage noise and current loop on large AC amplitude and fast slew rate signal at the LX node. 14-Jun-2012 Sheet of C:\YT\Project\Display\ISL97649EVA\EVAL Drawn Board\ISL97649AEVA.d By: 6. The exposed die plate should be soldered to an equivalent area of metal on the PCB. This contact area should have multiple via connections to the back of the PCB as well as connections to intermediate PCB layers, if available, to maximize thermal dissipation away from the IC. 7. To minimize the thermal resistance of the package when soldered to a multi-layer PCB, the amount of copper track and ground plane area connected to the exposed die plate should be maximized and spread out as far as possible from the IC. Especially, the top and bottom areas of the PCB should be maximized to allow thermal dissipation to the surrounding air. 8. Minimize feedback input track lengths to avoid switching noise pick-up. The ISL97649AIREVALZ, ISL97649BIREVALZ layout beginning on page 8, is provided to illustrate the proper layout implementation. 4. The feedback network should sense the output voltage directly from the point of load, and should be placed close to the IC but as far away from the LX node as possible. 5. The power ground (PGND) plane and signal ground (SGND) plane should be connected at only one point on the PCB near the device. 7 AN1646.2 April 4, 2013 Application Note 1646 ISL97649AIREVALZ, ISL97649BIREVALZ Layout FIGURE 13. EVALUATION BOARD ASSEMBLY LAYER FIGURE 14. TOP LAYER 8 AN1646.2 April 4, 2013 Application Note 1646 ISL97649AIREVALZ, ISL97649BIREVALZ Layout (Continued) FIGURE 15. BOTTOM LAYER 9 AN1646.2 April 4, 2013 Application Note 1646 TABLE 3. BOM FOR ISL97649AIREVALZ, ISL97649BIREVALZ EVALUATION BOARD PART TYPE DESIGNATOR FOOTPRINT 73.2k R1 0603 8.06k R2 0603 10 R3 0603 OPEN R4, R24, R25, R28 0603 100k R5, R10, R11, R13, R26 0603 1k R6 0603 83k R7 0603 133k R8 0603 10k R9, R16, R21 0603 5.5k R12 0603 85k R14 0603 115k R15 0603 82.5k R17 0603 39k R18 0805 0 R19, R27, R29, R30 0603 22k R22 0603 10µF/6.3V C1, C2 0805 OPEN C3 0805 10µF/25V C4, C5, C6 1210 0.1µF C7 0603 47nF/25V C8 0603 1µF/25V C9, C12 0603 47nF/25V C10 0603 0.1µF/25V C11, C15 0603 1500pF C13 1206 100pF C14 0603 1µF/16V C16, C17 0603 0.47µF/25V C18 0603 0.47µF/25V C19 0805 15nF C20 0603 22nF C21 0603 OPEN C22, C23, C27, C29, C30, C31, C34, C35 0603 2.2µF/10V C24 0603 1µF/25V C25 0603 1nF C26 0603 0.1µF/50V C28 1210 0.1µF/6.3V C32, C36 0603 0.1µF/25V C33 0603 MBRM120T3 D1 Case475 BAT54S D2 SOT-23 10 AN1646.2 April 4, 2013 Application Note 1646 TABLE 3. BOM FOR ISL97649AIREVALZ, ISL97649BIREVALZ EVALUATION BOARD (Continued) PART TYPE DESIGNATOR FOOTPRINT BAT54S D3 SOT-23 BAT54S D4 SOT-23 JUMPER JP1, JP2, JP4, JP5 JUMPER-2PIN JUMPER JP3, JP6, JP7 JUMPER-3PIN 10µH L1 RLF7030 MMBT3906 Q1 SOT-23 ISL97649 U1 QFN28 4X5MM MMSZ 5233B Z1 SOD-123 OPEN Z2 SOD-123 AVDD AVDD POWERPOST AVDD_GND AVDD_GND POWERPOST CD2 CD2 POWERPOST GPM_LO GPM_LO POWERPOST LDO_VIN LDO_VIN POWERPOST PGND PGND POWERPOST RESET RESET POWERPOST RSET RSET POWERPOST SCL SCL POWERPOST SDA SDA POWERPOST SGND SGND POWERPOST VDIV VDIV POWERPOST VFLK VFLK POWERPOST VGH VGH POWERPOST VGH_M VGH_M POWERPOST VIN VIN POWERPOST VLOGIC VLOGIC POWERPOST VLOGIC_GND VLOGIC_GND POWERPOST VOFF VOFF POWERPOST VON VON POWERPOST VOUT VOUT POWERPOST Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com 11 AN1646.2 April 4, 2013