Application Note 1523 Author: Jifeng Qin ISL78010EVAL1Z Evaluation Board User’s Guide The ISL78010EVAL1Z evaluation board is used to demonstrate the performance of the ISL78010 IC used for automotive grade TFT-LCD power supply solution. The top side and the bottom side of ISL78010EVAL1Z are shown in Figures 1 and 2, respectively. This board consists of power and load connectors for source and load side, external passive components, and the place holders reserved for the following applications: 1. Place holder for second stage positive charge pump for high voltage application at VON rail. 2. Place holder for additional external compensation. 3. Place holder for snubber circuits to improve EMI performance. The input voltage range is from 3V to 5V, and the maximum output voltage on main boost rail is 20V. Reference Documents • ISL78010 Data Sheet (FN6501) Key Features • 2A current FET • 3V to 5V input • Up to 20V boost output • 1% regulation on boost output • VLOGIC-VBOOST-VOFF-VON or VLOGIC-VOFF-VBOOST-VON sequence control • Programmable sequence delay • Fully fault protected • Thermal shutdown • Internal soft-start • 32 Ld 5x5 TQFP packages • Pb-free plus anneal available (RoHS compliant) Recommended Equipment The following materials are recommended to perform testing: • 0V to 10V Power Supply with at least 5A source current capability • Electronic Loads capable of sinking current up to 5A • Digital Multimeters (DMMs) • 100MHz quad-trace oscilloscope FIGURE 1. TOP VIEW OF ISL78010EVAL1Z Quick Setup Guide 1. Set power source to be 5V and with 0.5A current limiting. 2. Apply 5V to the input: J1 (VIN+) is input+, J2 (VIN-) is input-. Check the power source to make sure that no current limiting occurs. 3. Release the input power source’s current limiting to 5A. 4. Turn off the input power source. Set the electronic load to constant current load of 100mA, connect the electronic load to the VBST output: J6 (VBST) is output+, J8 (PGND) is output-. 5. Turn on the input power source, verify the output voltage is around 12V for VBST (J6, J8). 6. Verify that the ripple voltage (about 1MHz frequency) for the VBST voltage is around 50mV. 7. Verify the voltage at VON rail (between J3 and J7) is 20V. 8. Verify the voltage at VLOGIC rail (between J4 and J7) is 2.5V. FIGURE 2. BOTTOM VIEW OF ISL78010EVAL1Z January 14, 2010 AN1523.0 1 9. Verify the voltage at VOFF rail (between J5 and J7), is -8V. CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1523 Quick Start to Measure the Boost Output Voltage The evaluation board can be evaluated simply. Figure 3 shows the quick configuration to measure the boost rail output voltage. After powering on the input power supply, the oscilloscope probes can be placed at VBST pin to check the output voltage, and at LX pin to check the phase node voltage. FIGURE 4. EFFICIENCY MEASUREMENT SET UP Output Ripple/Noise Measurement FIGURE 3. QUICK SET UP TO MEASURE THE VBST VOLTAGE Efficiency Measurement Figure 4 shows the efficiency measurement set up for the ISL78010EVAL1Z Eval Board. The voltage and current meter can be used to measure input/output voltage and current. In order to obtain an accurate measurement and prevent the voltage drop of PCB or wire trace, the voltage meter must be close to the input/output terminals. The total noise is equal to the sum of the ripple and noise components. Simple steps should be taken to assure that there is minimum pickup noise due to the high frequency events, which can be magnified by the large ground loop formed by the oscilloscope probe ground. This means that even a few inches of ground wire on the oscilloscope probe may result in hundreds of millivolts of noise spikes when improperly routed or terminated. This effect can be overcome by using the short loop measurement method to minimize the measurement loop area for reducing the pickup noise. The short loop measurement method is shown in Figure 5. For ISL78010EVAL1Z evaluation board, the output ripple/noise measurement point is located at the C9 terminal. The efficiency equation is shown in Equation 1: ( V OUT • I OUT ) P OUT Output Power Efficiency = ------------------------------------ = ---------------- = ---------------------------------------P IN ( V IN • I IN ) Input Power (EQ. 1) As shown in Figure 4, the measuring point for the input voltage meter is at the C10 terminal, and the measuring point for the output voltage meter is at the C9 terminal. FIGURE 5. OUTPUT RIPPLE/NOISE MEASUREMENT 2 AN1523.0 January 14, 2010 ISL78010EVAL1Z Eval Board Application Diagram 3 Application Note 1523 AN1523.0 January 14, 2010 Application Note 1523 ISL78010EVAL1Z Eval Board Bill of Materials (BOM) DEVICE # DESCRIPTION Cp, C0, C8 CAP, SMD, 0603, 1000pF, 16V, 10%, X7R, RoHS VENKEL C0603X7R160102KNE TDK C1608X7R1H104K CAP, SMD, 0603, 1800pF, 50V, 10%, X7R, RoHS MURATA GRM39X7R182K050AQ CAP, SMD, 0603, 220pF, 50V, 10%, X7R, RoHS MURATA GRM188R71H221KA01D CAP, SMD, 0603, 0.022µF, 25V, 10%, X7R, RoHS MURATA GRM39X7R223K025AQ CAP, SMD, 0603, 0.22µF, 16V, 10%, X7R, RoHS TDK C1608X7R1C224K CAP, SMD, 0805, 4.7µF, 16V, 10%, X5R, RoHS MURATA GRM21BR61C475KA88L C9, C11, C12, C14, C22, C24, CAP, SMD, 0603, 0.1µF, 50V, 10%, X7R, C25, C41 RoHS C23 C4 C16 C7 C6, C10 C1, C2, C3 MANUFACTURER PART NUMBER MANUFACTURER CAP, SMD, 1206, 10µF, 25V, 10%, X5R, RoHS VENKEL C1206X5R250-106KNE C20 CAP, SMD, 1206, 0.47µF, 25V, 10%, X7R, RoHS PANASONIC ECJ-3YB1E474K C31 CAP, SMD, 1206, 4.7µF, 16V, 10%, X7R, RoHS MURATA GRM31CR71C475KA01L C15 CAP, SMD, 1210, 1µF, 50V, 10%, X7R, RoHS VENKEL C1210X7R500-105KNE COIL-PWR INDUCTOR, SMD, 7.3X6.8mm, 6.8µH, 20%, 2.8A, RoHS TDK RLF7030T-6R8M2R8 CONN-TURRET, TERMINAL POST, TH, RoHS KEYSTONE 1514-2 L1 J1-J8 TP1-TP3 CONN-MINI TEST POINT, VERTICAL, WHITE, KEYSTONE RoHS 5002 DIODE-SCHOTTKY, SMD, SOT23, 3P, 30V, 200mA, DUAL DIODE FAIRCHILD BAT54S D1 DIODE-SCHOTTKY, SMD, POWERMITE, 20V, 1A, RoHS ON SEMI MBRM120ET1G U1 IC-TFT-LCD POWER SUPPLY, 32P, TQFP, 5x5, INTERSIL RoHS ISL78010ANZ Q1 TRANSIST-MOS, P-CHANNEL, SMD, SUPERSOT3, -20V, -2.4A, RoHS FAIRCHILD FDN304P Q2 TRANSISTOR-NPN, SMD, SOT-23, 40V, 200mA, 350mW, RoHS FAIRCHILD MMBT3904 Q3 TRANSISTOR-PNP, SMD, SOT-23, 40V, 200mA, 350mW, RoHS FAIRCHILD MMBT3906 Q4 TRANSIST-MOS, P-CHANNEL, SMD, SUPERSOT3, -30V, -2A, RoHS FAIRCHILD FDN360P Q5 TRANSISTOR, PNP, SMD, SOT23, -30V, -1A, 500mW, RoHS FAIRCHILD FMMT549 R102, R104 RES, SMD, 0603, 1Ω, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-1R00FT RES, SMD, 0603, 10Ω, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-10R0FT RES, SMD, 0603, 0Ω, 1/10W, TF, RoHS CR0603-10W-000T D11, D21 R6 R10, R14, R101, R111 R7, R8 R9 4 VENKEL RES, SMD, 0603, 10k, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-1002FT RES, SMD, 0603, 1M, 1/10W, 1%, TF, RoHS CR0603-10W-1004FT VENKEL AN1523.0 January 14, 2010 Application Note 1523 ISL78010EVAL1Z Eval Board Bill of Materials (BOM) (Continued) DEVICE # DESCRIPTION MANUFACTURER MANUFACTURER PART NUMBER R22 RES, SMD, 0603, 165k, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-1653FT R11, R21, R41 RES, SMD, 0603, 20k, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-2002FT R42 RES, SMD, 0603, 21.5k, 1/10W, 1%, TF, RoHS VENKEL 9C06031A2152FKHFT R23 RES, SMD, 0603, 3.01k, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-3011FT R12 RES, SMD, 0603, 316k, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-3163FT RES, SMD, 0603, 46.4k, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-4642FT RES, SMD, 0603, 499Ω, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-4990FT R1 RES, SMD, 0603, 4.99k, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-4991FT R13 RES, SMD, 0603, 6.98k, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-6981FT R4 RES, SMD, 0603, 75.0k, 1/10W, 1%, TF, RoHS VENKEL CR0603-10W-7502FT BUMPONS, 0.44inW x 0.20inH, DOMETOP, BLACK 3M SJ-5003SPBL BAG, STATIC, 5x8, ZIP LOC INTERSIL 212403-013 R2 R43 Bottom four corners. Place assy in bag. CS1, C5, C13, C42, C102, C103 Do Not Populate Or Purchase (DNP) D12 Do Not Populate Or Purchase (DNP) Q111 Do Not Populate Or Purchase (DNP) RS1, R5, R100, R103, R105, Do Not Populate Or Purchase (DNP) R114 5 AN1523.0 January 14, 2010 Application Note 1523 ISL78010EVAL1Z Board Layout FIGURE 6. TOP COMPONENTS FIGURE 7. TOP LAYER ETCH 6 AN1523.0 January 14, 2010 Application Note 1523 ISL78010EVAL1Z Board Layout (Continued) FIGURE 8. BOTTOM LAYER COMPONENTS (MIRROR) FIGURE 9. BOTTOM LAYER ETCH (MIRROR) 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 7 AN1523.0 January 14, 2010