User Guide 035 ISL78171EVAL1Z Evaluation Board User Guide Description Key Features This quick start guide pertains to the ISL78171EVAL1Z Evaluation Board. This board is populated with 60 LEDs in 6P10S (six parallel strings, each string consisting of 10 LEDs in series) configuration to simplify evaluation and testing. The device can function with or without an I2C controller. If it is required to use I2C control for the ISL78171EVAL1Z board, use a generic I2C interface adapter (not supplied with the evaluation board kit) for the purpose of communication. Please note that the slave address on the ISL78171 is hexadecimal 58. Please refer to the quick setup guides for jumper settings and power-up instructions. • Integrated 40V boost converter Specifications • 6 Precision current sinks, up to 50mA each • Current matching ±0.7% typical • Dimming modes: DC, internal PWM, direct PWM, DC + Int/Dir PWM • Typical dimming ratio exceeding 60,000:1 for DC + Int/Dir PWM • Phase shift control for internal PWM dimming • 600kHz/800kHz/1.2MHz I2C selectable switching frequency • Dynamic headroom control This board has been configured and optimized for the following operating conditions: References • Input voltage: 4.5V to 26.5V ISL78171 Datasheet • Output voltage: 32V typical and 40V max Ordering Information • LED string current 20mA typical PART NUMBER PCB Details ISL78171EVAL1Z DESCRIPTION ISL78171 Evaluation Board Board dimension = 5.525x2.550inch Number of layers = 2 Type = FR4 Copper thickness = 2oz FIGURE 1. ISL78171EVAL1Z FRONT SIDE June 15, 2015 UG035.0 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 2015. 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. User Guide 035 Recommended Equipment The following equipment is recommended to perform testing: • 0V to 30V power supply with 5A source current capability • Digital Multimeters (DMMs) • 500MHz quad-trace oscilloscope • Signal generator for PWM pins Quick Setup Guide (Non I2C) 12. For I2C/SMBUS and DPST mode, in order to enable the board, write a hex 58 for slave address and write a hex 05 to register 01. 13. For DPST mode I2C dimming, write hex 01 to register 01 (see data sheet for more details). 14. For DPST mode with PWM dimming, write hex 03 to register 01. This will allow PWM dimming in DPST mode. TABLE 1. LED STRINGS CONFIGURATIONS WITH DIFFERENT JUMPER SETTINGS LED CONFIGUATRION 1. Ensure that the circuit is correctly connected to the supply. J6 2. Connect the VIN+ supply to both J1 = BOOST-VIN and TP9 = VIN_IN. J8 3. OPEN: Jumpers JP1, JP9, J9, J10, J12, J13, J15, J16, J18, J19, J21, J22, J24, J25, J26, J27 and J28. J11 4. CLOSE: Jumpers JP1A:1-2, JP2A:2-3, JP3A:2-3, JP4A:2-3, JP5A:2-3, J6, J8, J11, J14, J17, J20, J29, J30 and J31. J17 5. Apply 200Hz, 0-5V, 50% duty, square wave to TP13. 7. Note that the 6P10S LED strings are ON. J10 8. Apply 5V to TP13 and trim RA1 to set the LED current in CH0 to measure 20mA using a DMM in series with J8. J13 J19 Quick Setup Guide (I2C) J12 J15 2. Connect the VIN+ supply to both J1 = BOOST-VIN and TP9 = VIN_IN. J18 7. IC enable is shorted to VIN by connecting jumper JP2A:2-3, so that the EN is driven by TP9. 8. VLOGIC level for I2C can be generated from VDC by connecting jumper JP3A:2-3. VLOGIC can be driven from TP7 (VLOGIC) by shorting jumper JP3A:1-2. 9. The configuration of VIN (JP1A), EN (JP2A) and VLOGIC (JP3A) can be quickly found by referring to the table printed on the bottom of the evaluation board, as shown in Figure 6 on page 7. Short Open Open Open Short J9 1. Ensure that the circuit is correctly connected to the supply. 6. Set device address to 0x58. Open J22 J24 5. Connect an I2C controller bus to either J7 or J39. Short J16 10. Check that the current in J8 in step 9 varies from ~0mA to 20mA. Test complete turn OFF supplies. 4. CLOSE: Jumper JP1A:1-2, JP2A:2-3, JP3A:2-3, JP4A:1-2, JP5A:1-2, J6, J8, J11, J14, J17, J20, J30 and J31. 6P8S JJ20 J30 3. OPEN: Jumpers JP1, JP9, J9, J10, J12, J13, J15, J16, J18, J19, J21, J22, J24, J25, J26, J27, J28 and J29. 6P9S Short J14 6. Measure the voltage between J4 and J5. IT should read ~32V 9. Apply a square wave of 200Hz, 5V and vary the duty from 0% to 100% and check that the LED varies from OFF to 100% brightness. 6P10S J21 J23 15. The LED current can be programmed by varying POT RA1 using Equation 1: ILED = 410.5 R A1 + R 16 = 410.5 R 13 (EQ. 1) The measured current divided by six is the LED current per channel. For example, 120mA measured current will correspond to 20mA/channel. 16. The PWM dimming frequency can be adjusted by varying pot RA2 using Equation 2: 7 F PWM = 6.66 10 R A2 + R 12 (EQ. 2) 10. There are 4 different operation modes for ISL78171. The setting for each mode is shown on the other table printed on the bottom of the evaluation board, as shown in Figure 6 on page 7. 11. For I2C/SMBUS and DPST mode, connect the I2C interface board to the ISL78171EVAL1Z board. Submit Document Feedback 2 UG035.0 June 15, 2015 User Guide 035 SCHOTTKY DIODE, 60V, 3A L=15uH VIN = 4.5V TO 26.5V VIN 40V, 6 x 50mA* LX FAULT ISL78171 EN VDC REG OSC AND RAMP COMP FPWM =0 FET DRIVER LOGIC IMAX ILIMIT LED PWM CONTROL PGND CH0 COMP RSET OVP OVP FAULT/STATUS REGISTER GM AMP REFERENCE GENERATOR HIGHEST VF STRING DETECT OC, SC DETECT + - + - CH5 OC, SC DETECT *VIN > 12V FAULT/STATUS REGISTER AGND TEMP SENSOR SMBCLK/SCL SMBDAT/SDA PWM SMBUS/I2C INTERFACE AND PWM CONTROL LOGIC REGISTERS PWM BRIGHTNESS CONTROL DEVICE CONTROL FAULT/STATUS IDENTIFICATION DC BRIGHTNESS CONTROL CONFIGURATION + PWM/OC/SC FAULT/STATUS REGISTER DC FIGURE 2. ISL78171 BLOCK DIAGRAM PCB Layout Recommendation EMI Considerations The PCB layout is very important for normal functioning of the ISL78171, to ensure the system works with low EMI. The main power loop is composed of the input capacitor, boost inductor, the output capacitor, the LX pin and the PGND pin. It is necessary to make the power loop as small as possible and the connecting traces among them should be direct, short and wide. The switching node of the boost converter (LX pins) and the traces connected to the node are noisy, so keep the low level signals away from these noisy traces. The input capacitor should be placed as close as possible to the VIN and GND pins. The ground of input and output capacitors should be connected as close as possible. The heat of the IC is mainly dissipated through the thermal pad. Maximizing the copper area connected to the thermal pad is preferable. In addition, a solid ground plane is helpful for better EMI performance. It is recommended to add at least 6 vias ground connection within the pad for the best thermal conduction. Keep the PGND plane and AGND plane separate and connect them at the thermal pad. The LX node switches at the VIN potential so its capacitance to GND should be made minimized. This is achieved by keeping the LX copper island as small as possible and by opening the copper GND area directly below it. This prevents injection of the switching frequency noise directly into the GND, and reduces the conducted EMI for the system. The evaluation board also has an input LC filter option on it ie., L2/L2A and C23. These components are not populated on the PCB but can be soldered in for the purpose of EMI evaluation if needed. The snubber R3 and C21 helps to reduce the peak voltage seen on the LX pin. Submit Document Feedback 3 UG035.0 June 15, 2015 Submit Document Feedback ISL78171EVAL1Z Layout 4 User Guide 035 FIGURE 3. SILKSCREEN TOP UG035.0 June 15, 2015 Submit Document Feedback ISL78171EVAL1Z Layout (Continued) THIS TRACE IS A SHIELD DRAIN CONNECTION 5 User Guide 035 FIGURE 4. TOP LAYER UG035.0 June 15, 2015 Submit Document Feedback ISL78171EVAL1Z Layout (Continued) 6 User Guide 035 FIGURE 5. BOTTOM LAYER UG035.0 June 15, 2015 Submit Document Feedback ISL78171EVAL1Z Layout (Continued) 7 User Guide 035 FIGURE 6. SILKSCREEN BOTTOM UG035.0 June 15, 2015 L1A DNP 2 2 D1 1 OUT VOUT C6 C5 C4 4.7UF PMEG6030EP 4.7UF C2 J31A 0.10UF 1 4.7UF XAL6060-153ME C17 XAL6060-153ME C1 15UH 4.7UF OPEN L1 2 15UH 4.7UF JP1 1 C22 OPEN C3 L2 BOOST_VIN J1 R4 4.99 4.7UF L2A DNP C23 Submit Document Feedback ISL78171EVAL1Z Evaluation Board Schematic J4 Q1 PGND PGND J5 J2 E FDS4435BZ_F085 18 19 12 CH2 11 CH1 JP9 357K 10K IN IN IN CH0 IN TP14 RA2 R10 2 IN VDC IN 2 JP29 0 1 1M R12 1 R1 C9 CH3 R9 TP13 100PF C10 17 RSET 13 IN CH0 CH4 DNP TP11 1 CH5 14 2.21K 7 JP5A 1 J7 15 IN 3 PMBUS DONGLE CH2 CH1 EP PWM 2 STANDARD SMBDAT /SDA 4.7K R6 JP4A 4 CONNECTOR FOR 4.7K J39-1 R7 SDA_S TP10 PWM E CH3 16 10 21 CH4 ISL78171IRZ AGND 6 VDC 9 5 SDA_IC COMP 20 LX 4 CH5 /SCL VDC EN FPWM OUT 1UF C7 PWM 3 OVP U1 VIN SMBCLK VLOGIC EN FAULT SCL_IC TP8 JP3A 2 8 1 VIN FPWM FAULT User Guide 035 JP2A PGND 0.10UF EN_IN TP7 R2 IN RSET C19 R2A E 10K C21 220PF C20 R3 4.99 OPEN JP1A VIN_IN 0.033UF 390PF C18 TP9 E C8 E OPEN 8 AGND J3 SCL_S 2 SCL_S SDA_S DRAWN BY: RA1 5 1M 6 R16 4.99K TIM KLEMANN DATE: ENGINEER: DATE: UPDATED BY: DATE: DATE: THEJU BERNARD 05/04/2015 RELEASED BY: TITLE: ISL78171 OUT 0 7 8 RSET R14 DNP 4 R13 3 EVALUATION BOARD TP12 SCHEMATIC TESTER 9 10 MASK# HRDWR ID 22-05-3101 FILENAME: ~/ISL78171/ISL78171EVAL1ZA UG035.0 June 15, 2015 FIGURE 7. SCHEMATIC (PAGE 1) SHEET 1 O VOUT 1 J6 (Continued) 2 1 1 J14 J11 J17 J30 J20 D5 D6 D16 D7 D26 D27 1 1 D44 1 D53 1 D43 J19 J23 2 2 2 D34 D52 J22 D54 J24 D45 D55 D36 D46 D56 D37 D47 D57 D38 D48 D39 D49 D40 D50 D41 D51 User Guide 035 D35 1 D17 J16 J21 2 D24 D25 2 1 2 2 D15 D42 J18 2 2 J13 2 D14 D32 D33 1 1 D23 2 9 1 D13 J10 J15 1 D3 D4 D22 2 2 J12 2 D12 J9 1 2 1 D2 1 2 2 J8 1 1 1 1 IN 2 Submit Document Feedback ISL78171EVAL1Z Evaluation Board Schematic D8 D18 J26 D19 J27 D20 D28 D58 21 J25 D29 D59 12 D9 D30 D60 12 D10 D11 D21 D31 D61 C16 1000PF C15 1000PF C14 1000PF C13 1000PF C12 1000PF C11 1000PF 2 J28 CH0 OUT OUT CH1 CH2 OUT OUT DRAWN BY: CH3 CH4 TIM KLEMANN DATE: 05/05 RELEASED BY: DATE: UPDATED BY: DATE: OUT OUT CH5 TP6 TP5 TP4 TP3 TP2 TP1 T UG035.0 June 15, 2015 FIGURE 8. SCHEMATIC (PAGE 2) FILENA User Guide 035 Bill of Materials MANUFACTURER PART REFERENCE DESIGNATOR QTY UNITS ISL78171EVAL1ZREVAPCB 1 ea 06031A101JAT2A 1 ea C9 CAP, SMD, 0603, 100pF, 100V, 5%, NP0, ROHS AVX 06033A391FAT2A 1 ea C20 CAP, SMD, 0603, 390pF, 25V, 1%, C0G, ROHS C0603C33K3RACAUTO 1 ea C8 CAP-AEC-Q200, SMD, 0603, 0.033µF, 25V, 10%, KEMET X7R, ROHS CGA3E2X7R1H104K080AA 2 ea C2, C19 CAP-AEC-Q200, SMD, 0603, 0.1µF, 50V, 10%, X7R, ROHS TDK CGA5L3X7R1H475K160AE 2 ea C1, C17 CAP-AEC-Q200, SMD, 1206, 4.7µF, 50V, 10%, X7R, ROHS TDK CGA6M3X7S2A475K200AE 4 ea C3-C6 CAP-AEC-Q200, SMD, 1210, 4.7µF, 100V, 10%, TDK X7S, ROHS GCJ188R72A102KA01D 6 ea C11-C16 CAP-AEC-Q200, SMD, 0603, 0.001µF, 100V, 10%, X7R, ROHS ECJ-1VB2A221K 1 ea C21 CAP, SMD, 0603, 220pF, 100V, 10%, X7R, ROHS PANASONIC 0 ea C22 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS LMK107B7105KAHT 1 ea C7 CAP-AEC-Q200, SMD, 0603, 1.0µF, 10V, 10%, X7R, ROHS TAIYO YUDEN XAL6060-153MEC 2 ea L1, L2 COIL-PWR INDUCT, SMD, 15µH, 20%, 39.7mΩ, 11Mhz, 6.5X6.3mm, ROHS COILCRAFT 1514-2 5 ea J1-J5 CONN-TURRET, TERMINAL POST, TH, ROHS KEYSTONE 22-05-3101 1 ea J7 CONN-HEADER, TH, 10P, 2.54mm, R/A, FRICTIONLOCK, ROHS MOLEX 22-11-2042 1 ea J39 CONN-HEADER, 1X4, SOLID, 2.54mm, VERTICAL, FRICTION LOCK, GOLD MOLEX 5002 14 ea TP1-TP14 CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS KEYSTONE 68000-236HLF 5 ea JP1A-JP5A CONN-HEADER, 1x3, BREAKAWY 1X36, 2.54mm, ROHS BERG/FCI 69190-202HLF 27 ea J6, J8-J31, JP1, JP9 CONN-HEADER, 1X2, RETENTIVE, 2.54mm, 0.230X 0.120, ROHS BERG/FCI PMEG6030EP, 115 1 ea D1 DIODE-SCHOTTKY RECTIFIER, SMD, SOD128, 60V, 3A, ROHS NXP SEMICONDUCTOR LWY87C-T1U1-3K8L-Z 60 ea D2-D61 LED, SMD, 2P, 3X1.2, WHITE/DIFFUSED, 3.2V, 20mA, 420mcd, ROHS OSRAM ISL78171ARZ-T 1 ea U1 IC-6-CHANNEL LED DRIVER, 20P, QFN, ROHS INTERSIL FDS4435BZ_F085 1 ea Q1 TRANSISTOR-MOS, P-CHANNEL, 8P, SOIC, -30V, FAIRCHILD -8.8A, ROHS 3299W-1-105LF 2 ea RA1, RA2 POT-TRIM, TH, 1M, 0.5W, 10%, 3P, 3/8SQ, 25TURN, ROHS BOURNS CRCW06030000Z0EA 2 ea R10, R14 RES, SMD, AEC-Q200, 0603, 0Ω, 1/10W, TF, ROHS VISHAY CRCW060310K0FKEA 2 ea R2, R2A RES-AEC-Q200, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS VISHAY/DALE CRCW06032K21FKEA 1 ea R12 RES-AEC-Q200, SMD, 0603, 2.21k, 1/10W, 1%, VISHAY/DALE TF, ROHS Submit Document Feedback 10 DESCRIPTION PWB-PCB, ISL78171EVAL1Z, REVA, ROHS MANUFACTURER IMAGINEERING INC AVX MURATA UG035.0 June 15, 2015 User Guide 035 Bill of Materials MANUFACTURER PART (Continued) REFERENCE DESIGNATOR QTY UNITS DESCRIPTION MANUFACTURER CRCW0603357KFKEA 1 ea R1 RES-AEC-Q200, SMD, 0603, 357k, 1/10W, 1%, VISHAY/DALE TF, ROHS CRCW06034K70FKEA 2 ea R6, R7 RES-AEC-Q200, SMD, 0603, 4.7k, 1/10W, 1%, TF, ROHS CRCW06034K99FKEA 1 ea R16 RES-AEC-Q200, SMD, 0603, 4.99k, 1/10W, 1%, VISHAY/DALE TF, ROHS RC0805FR-074R99L 2 ea R3, R4 RES, SMD, 0805, 4.99Ω, 1/8W, 1%, TF, ROHS SJ-5003SPBL 4 ea Bottom four corners BUMPONS, 44inW x 20inH, DOMETOP, BLACK 3M 212403-013 1 ea Place assy in bag BAG, STATIC, 5X8, ZIPLOC, ROHS INTERSIL 0 ea C10, C18 (0603 AUTO-AEC-Q200) DO NOT POPULATE OR PURCHASE 0 ea DO NOT POPULATE OR PURCHASE C23 (CGA5L3X7R1H475 K160AE) 0 ea L1A, L2A (SRP1038A-150M) DO NOT POPULATE OR PURCHASE 0 ea R9, R13 (0603 AUTO-AEC-Q200) DO NOT POPULATE OR PURCHASE VISHAY/DALE YAGEO 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 document is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com Submit Document Feedback 11 UG035.0 June 15, 2015 User Guide 035 Typical Performance Curves 95 95 90 90 85 85 80 EFFICIENCY (%) EFFICIENCY (%) 12V 5V 75 24V 26.5V 70 65 80 70 65 60 55 55 0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 50 0.20 0 0.02 0.04 0.06 LED CURRENT (A) 90 12V EFFECIENCY (%) EFFICIENCY (%) 0.12 0.14 0.16 0.18 0.20 95 85 80 5V 75 0.10 FIGURE 10. EFFICIENCY vs LED CURRENT AT LX FREQUENCY = 600kHz AT 25°C vs VIN 24V 90 0.08 LED CURRENT (A) FIGURE 9. EFFICIENCY vs LED CURRENT AT LX FREQUENCY = 600kHz AT -40°C vs VIN 95 5V 26.5V 75 60 50 24V 12V 26.5V 70 65 -40°C 85 +25°C 80 +105°C 75 70 60 65 55 50 0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 60 0.20 0 5 10 15 95 95 90 90 12V 85 85 80 80 26.5V 70 5V 24V 65 55 0.04 0.06 0.08 0.10 0.12 0.14 0.16 LED CURRENT (A) FIGURE 13. EFFICIENCY vs LED CURRENT AT LX FREQUENCY = 1.2MHz AT -40°C vs VIN Submit Document Feedback 12 0.18 0.20 5V 26.5V 65 55 0.02 12V 70 60 0 30 24V 75 60 50 25 FIGURE 12. EFFICIENCY vs INPUT VOLTAGE AT LX FREQUENCY = 600kHz vs VIN EFFICIENCY (%) EFFICIENCY (%) FIGURE 11. EFFICIENCY vs LED CURRENT AT LX FREQUENCY = 600kHz AT +105°C vsVIN 75 20 VIN (V) LED CURRENT (A) 50 0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 LED CURRENT (A) FIGURE 14. EFFICIENCY vs LED CURRENT AT LX FREQUENCY = 1.2MHz AT +25°C vs VIN UG035.0 June 15, 2015 User Guide 035 Typical Performance Curves (Continued) 95 95 90 26.5V 90 -40°C 80 EFFECIENCY (%) EFFICIENCY (%) 85 12V 75 5V 24V 70 65 85 +25°C +105°C 80 75 70 60 65 55 50 0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 60 0.20 0 5 10 15 LED CURRENT (A) FIGURE 15. EFFICIENCY vs LED CURRENT AT LX FREQUENCY = 1.2MHz AT +105°C vs VIN 0.8 CHANNEL MATCHING (%) 0.6 0.4 20 25 30 0.1 1 VIN (V) FIGURE 16. EFFICIENCY VS INPUT VOLTAGE AT LX FREQUENCY = 1.2MHz vs VIN +25°C, 5V 12V 24V 26.5V +105°C, 5V 12V 24V 26.5V -40°C, 5V 12V 24V 26.5V 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 1 2 3 4 5 CHANNEL NUMBER FIGURE 17. CHANNEL-TO-CHANNEL CURRENT MATCHING, 600kHz vs VIN 1 1.2 NORMALIZED LED CURRENT CURRENT (mA) 1.0 0.8 4.5 VIN 0.6 12 VIN 0.4 0.2 0 0 2 1 3 4 5 PWM DIMMING DUTY CYCLE (%) FIGURE 18. CURRENT LINEARITY vs LOW LEVEL PWM DIMMING DUTY CYCLE vs VIN Submit Document Feedback 13 6 0.1 0.01 0.001 0.0001 0.00001 0.00001 0.0001 0.001 0.01 DIMMING FACTOR (PWM Reg Value x DC Reg Value) / (255 x 255) FIGURE 19. NORMALIZED LED CURRENT vs. DIMMING FACTOR, (MEASURED AT ILED = 20mA) UG035.0 June 15, 2015