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Intersil ISL9440CEVAL1Z Application Note

Triple pwm step-down synchronous buck controller and one ldo
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®
ISL9440CEVAL1Z Evaluation Board
The ISL9440CEVAL1Z evaluation board features the
ISL9440C. The ISL9440C is quad-output controller that
integrates three PWM synchronous buck controllers and one
low-dropout linear regulator controller. The ISL9440C offers
programmable soft-start, independent enable functions and
integrates OV/OC/OT protection. The current mode control
architecture and internal compensation network keep
peripheral component counts minimized. 600kHz switching
frequency can minimize inductor size while the strong gate
driver is able to deliver 12A to each PWM channel.
Table 1 shows the difference in terms of ISL944xx family
features.
ISL9440CEVAL1Z: Triple PWM Step-Down
Synchronous Buck Controller and One LDO
Application Note
FIGURE 1. ISL9440CEVAL1Z EVALUATION BOARD
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
June 30, 2009
TABLE 1. FEATURES OF ISL944xx FAMILY
SWITCHING
PART
EARLY
FREQUENCY
NUMBER
WARNING
ISL9440
YES
ISL9440A
YES
ISL9441
NO
ISL9440B
YES
ISL9440C
YES
The ISL9440CEVAL1Z is easy to set up to evaluate the
performance of the ISL9440C. Please refer to the "Electrical
Specifications" for typical performance summary.
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
AN1482.0
SOFT-STARTING
TIME
(kHz)
(ms)
300
1.7
600
1.7
300
1.7
300
PROGRAMMABLE
600
PROGRAMMABLE

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Summary of Contents for Intersil ISL9440CEVAL1Z

  • Page 1 PROGRAMMABLE driver is able to deliver 12A to each PWM channel. The ISL9440CEVAL1Z is easy to set up to evaluate the Table 1 shows the difference in terms of ISL944xx family performance of the ISL9440C. Please refer to the “Electrical features.

  • Page 2: What's Inside

    The Evaluation Board Kit contains the following materials: 1. Ensure that the circuit is correctly connected to the supply and electronic loads prior to applying any power. Please • The ISL9440CEVAL1Z refer to Figure 2 for proper set-up. • The ISL9440B, ISL9440C datasheet 2.
  • Page 3 Application Note 1482 + VIN - FIGURE 2. PROPER TEST SET-UP 3. R27, R22 and R25 are 10kΩ resistors for discharging the MOSFET gates. 4. R26, R23 and R24 are current sensing resistors to monitor the load step. For accurate measurement, please use 5% tolerance sensing resistor or better.
  • Page 4 Application Note 1482 OPT. LOAD TRAN. FIGURE 4. LOAD TRANSIENT CIRCUIT FOR PWM1 Typical Evaluation Board Performance Curves = 12V, Unless Otherwise Noted. = 9VDC = 9VDC = 12VDC = 12VDC = 16VDC = 16VDC LOAD CURRENT (A) LOAD CURRENT (A) FIGURE 5.
  • Page 5 Application Note 1482 Typical Evaluation Board Performance Curves = 12V, Unless Otherwise Noted. (Continued) (AC), 50mV/DIV OUT3 (AC), 50mV/DIV OUT2 500ns/DIV 500ns/DIV FIGURE 9. PWM2 OUTPUT RIPPLE UNDER MAX LOAD FIGURE 10. PWM3 OUTPUT RIPPLE UNDER MAX LOAD = 12V, I = 6A, I = 4A, FULL = 12V, I...
  • Page 6 R8 107K TP14 Si4423DY Cf f 2 100p Enabled TP15 Css2 R9 21.5K LDOFB LDOFB Disabled 2.5V @ 1.0A CO41 CO42 100u TP16 4.0V 4TPE100MZB Title ISL9440CEVAL1Z EVALUATION BOARD Size Document Number <Doc> Date: Monday , May 11, 2009 Sheet...
  • Page 7 Generic 51Ω RESISTOR, SMD, 0603,1% Generic 20kΩ RESISTOR, SMD, 0603,1% Generic 107kΩ RESISTOR, SMD, 0603,1% Generic 21.5kΩ RESISTOR, SMD, 0603,1% Generic 10kΩ RESISTOR, SMD, 0603,1% Generic 34kΩ RESISTOR, SMD, 0603,1% Generic QUAD OUTPUT CONTROLLER ISL9440C Intersil AN1482.0 June 30, 2009...
  • Page 8 TP9, TP5, TP15, TP20 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.
  • Page 9 ISL9440CEVAL1Z PCB Layout FIGURE 16. TOP LAYER FIGURE 15. TOP COMPONENTS...
  • Page 10 ISL9440CEVAL1Z PCB Layout (Continued) FIGURE 18. THIRD LAYER FIGURE 17. SECOND LAYER (SOLID GROUND)
  • Page 11 ISL9440CEVAL1Z PCB Layout (Continued) FIGURE 19. BOTTOM LAYER (MIRRORED) FIGURE 20. BOTTOM COMPONENTS (MIRRORED)
  • Page 12 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Intersil ISL9440CEVAL1Z...