Application Note 1521 ISL6445 Evaluation Board User Guide Hardware Description VIN The ISL6445EVAL3Z evaluation board is designed to demonstrate the performance of the ISL6445. LOAD LOAD The ISL6445 is a high-performance, dual-output PWM controller optimized for converting wall adapter, battery or network intermediate bus DC input supplies into the system supply voltages required for a wide variety of applications. Each output is adjustable down to 0.8V. The two PWMs are synchronized 180° out-of-phase reducing the RMS input current and ripple voltage. 5.6V TO 24V ISL6445 Reference Design The ISL6445 evaluation board illustrates the operation of the IC. The design criteria is listed in Table 1. FIGURE 1. POWER AND LOAD CONNECTIONS FOR 5.6V TO 24V INPUT VOLTAGE TABLE 1. DESIGN CRITERIA 3.3V Output current (IOUT1) 3A Output voltage (VOUT2) 2.5V Output current (IOUT2) 3A Power and Load Connections If using an input supply ranging from 5.6V to 24V, connect the supply to VIN (P1) and GND (P2) posts as shown in Figure 1. ISL6445 has an internal +5V linear regulator which can be used to bias the IC. When using a 5V ±10% input supply, connect the negative polarity to GND (P2) post and connect the positive polarity of the power supply to both VIN (P1) post and the VCC5 (TP1) post. This will disable the internal LDO and the chip will be powered by the input power supply (see Figure 2). CAUTION: Ensure that the +5V terminal is not connected to when applying voltages >7V. This can damage the IC. 1 LOAD Output voltage (VOUT1) January 15, 2010 AN1521.0 VIN 5V±10% PACKAGE LOAD PARAMETERS FIGURE 2. POWER AND LOAD CONNECTIONS FOR 5V±10% INPUT VOLTAGE Test-point and Terminals Descriptions TABLE 2. ISL6445EVAL3Z TEST POINT DESCRIPTION TEST POINTS AND TERMINALS SIGNALS TP1 PGOOD TP2 VCC5 TP3 GND P1 VIN P2 GND P3 VOUT2 P4 GND P5 VOUT1 P6 GND 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 1521 Typical Performance Curves 95 95 VIN = 12V 90 90 VIN = 12V 85 80 VIN = 18V 75 VIN = 24V 70 65 60 55 50 EFFICIENCY (%) EFFICIENCY (%) 85 80 75 VIN = 18V 70 65 60 55 50 45 45 40 40 0.3 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 OUTPUT CURRENT (A) 1.2 1.5 1.8 2.1 2.4 2.7 3.0 2.505 3.300 VIN = 12V VIN = 18V VIN = 24V OUTPU VOTLAGE (V) 3.305 3.290 0.9 FIGURE 4. EFFICIENCY FOR VOUT2 (VOUT1 IS DISABLED) 3.310 3.295 0.6 OUTPUT CURRENT (A) FIGURE 3. EFFICIENCY FOR VOUT1 (VOUT2 IS DISABLED) OUTPU VOTLAGE (V) VIN = 24V 2.500 2.495 2.490 VIN = 18V 2.485 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 OUTPUT CURRENT (A) FIGURE 5. VOUT1 (3.3V) REGULATION VIN = 12V VIN = 24V 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 OUTPUT CURRENT (A) FIGURE 6. VOUT2 (2.5V) REGULATION VOUT1 VOUT1 VOUT2 VOUT2 PGOOD FIGURE 7. OUTPUT RIPPLEs AT FULL LOAD (20BW); INPUT VOLTAGE = 12V 2 FIGURE 8. SOFT-START WAVEFORMS AN1521.0 January 15, 2010 Application Note 1521 VOUT1 VOUT1 VOUT2 VOUT2 IOUT1 IOUT2 FIGURE 9. LOAD TRANSIENT: INPUT VOLTAGE = 12V, IOUT1 = 0A <-> 3A, IOUT2 = 3A FIGURE 10. LOAD TRANSIENT: INPUT VOLTAGE = 12V, IOUT1 = 3A, IOUT2 =0A <->3A VOUT1 VOUT1 VOUT2 VOUT2 IOUT1 IOUT2 FIGURE 11. LOAD TRANSIENT: INPUT VOLTAGE = 18V, IOUT1 = 0A <-> 3A, IOUT2 = 3A FIGURE 12. LOAD TRANSIENT: INPUT VOLTAGE = 18V, IOUT1 = 3A, IOUT2 =0A <->3A VOUT1 VOUT1 VOUT2 VOUT2 IOUT1 IOUT2 FIGURE 13. LOAD TRANSIENT: INPUT VOLTAGE = 24V, IOUT1 = 0A <-> 3A, IOUT2 = 3 3 FIGURE 14. LOAD TRANSIENT: INPUT VOLTAGE = 24V, IOUT1 = 3A, IOUT2 =0A <->3A AN1521.0 January 15, 2010 ISL6445EVAL3Z Schematic P1 1 VIN 1 VIN C20 10uF 2 TP3 P2 1 GND 1 Q1 1 1 JP2 C27 DNP 1 SS2 9 0.1uF OCSET2 10 R13 60.4k 11 2 C25 2 R18 12 ISEN2 PGOOD VCC5 SD2 SS2 OCSET2 PGND SD1 SS1 SGND OCSET1 FB2 FB1 VIN BIAS TP1 1 PGOOD R2 R3 806 18 17 SS1 1 0.1uF 15 OCSET1 R4 14 60.4k 1k R14 JP1 R16 0 13 PGOOD 11.5k C28 1uF 2 C15 2.2uF C2 270pF R15 10k 1 C23 1uF 1 GND 35.7k C26 DNP C5 10uF P6 R17 2 C10 16 C1 330pF VOUT1 C6 1uF 2 0 0 20 ISEN1 19 1 2 R11 2 0.1uF 1 C7 PHASE1 R8 C16 220uF 2.2 2 21 1 1 ISEN1 22 UGATE1 R12 2 PHASE1 0 2 2 R20 PHASE2 VIN 0 11.5k 2 C14 330pF UGATE1 R7 1 8 2 24.3k C4 270pF DNP C13 7 BOOT1 UGATE2 LGATE1 23 BOOT1 1 P5 VOUT1 1 2 VCC5 1 R19 2 R21 1k 1 2 1 4.7uF PGOOD 6 Vout=3.3V @3A 2 1 2 C21 806 BOOT2 24 1 2.2 1 2 GND C24 1uF PHASE2 4 ISEN2 5 R1 2 1 2 P4 0 LGATE1 1 1 2 R5 C17 220uF C8 10uF C22 0.1uF UGATE2 3 R10 ISL6445IAZ 2 1 1 2 1 C9 1uF 0 U1 LGATE2 L1 1.5uH C3 DNP Application Note 1521 VOUT2 L2 1.5uH 1BOOT2 2 1 R9 IRF7902PBF P3 LGATE2 1 1 Vout=2.5V @3A 0 2 1 2 R6 BAT54HT D1 2 2 2 IRF7902PBF BAT54HT D2 C11 1uF Q2 1 C12 1uF 1 1 2 4 C18 10uF 1VOUT2 2 C19 10uF VCC5 VIN 1 VIN TP2 AN1521.0 January 15, 2010 Application Note 1521 ISL6445EVAL3Z Rev. A Bill of Materials ID REFERENCE QTY PART NUMBER PART TYPE DESCRIPTION PACKAGE VENDOR 1 U1 1 ISL6445IAZ Dual PWM Controller IC, Dual PWM Controller 24 Ld QSOP Intersil 2 Q1, Q2 2 IRF7902PBF MOSFET, Dual Dual 30V N-channel MOSFET SO-8 International Rectifier 3 D1, D2 2 BAT54HT1G-T Diode, Schottky 30V, 200mA SOD-323 On Semi 4 L1, L2 2 FP3-1R5-R Inductor 1.5µH, 20%, 6.2A SMD Coiltronics CAPACITORS 5 C1, C14 2 Capacitor, Ceramic, X7R 330pF, 10%, 50V SM_0603 Various 6 C2, C4 2 Capacitor, Ceramic, X7R 270pF, 10%, 50V SM_0603 Various 7 C5, C8 2 Capacitor, Ceramic, X5R 10µF, 10%, 16V SM_1206 Various 8 C6, C9, C11, C12, C23, C24, C28 7 Capacitor, Ceramic, X5R 1µF, 10%, 25V SM_0603 Various 9 C7, C10, C22, C25 4 Capacitor, Ceramic, X7R 0.1µF, 10%, 50V SM_0603 Various 10 C15 1 Capacitor, Ceramic, X5R 2.2µF, 20%, 25V SM_805 Various 11 C16, C17 2 Capacitor, POSCAP 220µF, 20%, 6.3V, 0.018Ω Case D2E SANYO 12 C18, C19, C20 3 Capacitor, Ceramic, X7R 10µF, 10%, 25V SM_1210 Various 13 C21 1 Capacitor, Ceramic, X5R 4.7µF, 10%, 16V SM_0805 Various 14 C3, C13, C26, C27 6TPE220MI Do not populate RESISTORS 15 R1,R3 2 Resistor, Film 806Ω, 1%, 1/10W SM_0603 Panasonic/Generic 16 R2 1 Resistor, Film 10kΩ, 1%, 1/10W SM_0603 Panasonic/Generic 17 R4, R13 2 Resistor, Film 60.4kΩ, 1%, 1/16W SM_0603 Panasonic/Generic 18 R5, R12 2 Resistor, Film 2.2Ω, 1%, 1/10W SM_0603 Panasonic/Generic 19 R6, R7, R8, R9, R10, R11, R16, R18 8 Resistor, Film 0Ω, 1/10W SM_0603 Panasonic/Generic 20 R14 1 Resistor, Film 35.7kΩ, 1%, 1/10W SM_0603 Panasonic/Generic 21 R15, R20 2 Resistor, Film 11.5kΩ,1%,1/10W SM_0603 Panasonic/Generic 22 R17, R21 2 Resistor, Film 1kΩ, 1%, 1/10W SM_0603 Panasonic/Generic 23 R19 1 Resistor, Film 24.3kΩ, 1%, 1/10W SM_0603 Panasonic/Generic Terminal post, through hole, PTH 1/4 inch OTHERS 23 P1 - P6 6 1514-2 Turrett Post 24 TP1, TP2, TP3 3 5002 TEST POINT vertical, white PC test jack 25 JP1, JP2 2 68000-236-1X2 Header 5 PTH Keystone Keystone 1X2 Break Strip GOLD AN1521.0 January 15, 2010 Application Note 1521 ISL6445EVAL3Z Printed Circuit Board Layers FIGURE 15. ISL6445EVAL3Z - TOP LAYER (SILKSCREEN) FIGURE 17. ISL6445EVAL3Z - LAYER 2 FIGURE 19. ISL6445EVAL3Z - BOTTOM LAYER (SOLDER SIDE) FIGURE 16. ISL6445EVAL3Z - TOP LAYER (COMPONENT SIDE) FIGURE 18. ISL6445EVAL3Z - LAYER 3 FIGURE 20. ISL6445EVAL3Z - BOTTOM LAYER (SILKSCREEN) 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 6 AN1521.0 January 15, 2010