herunterladen
1
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 1551
ISL9440AEVAL1Z: Triple PWM Step-Down
Synchronous Buck Controller and One LDO
ISL9440AEVAL1Z Evaluation
Board
The ISL9440AEVAL1Z evaluation board features the
ISL9440A. The ISL9440A is a a quad-output controller
that integrates three PWM synchronous buck controllers
and one low-dropout linear regulator controller. The
ISL9440A offers internal soft-start, independent enable
functions and integrates UV/OV/OC/OT protection. Its
current mode control architecture and internal
compensation network keep peripheral component
count minimal. Switching frequency of 600kHz
minimizes inductor size while the strong gate drivers
deliver up to 12A to each PWM channel.
Table 1 shows the difference in terms of ISL944xx family
features.
The ISL9440AEVAL1Z is easy to set up to evaluate the
performance of the ISL9440A. Please refer to the
“Electrical Specifications” table on page 2 for typical
performance summary.
TABLE 1. FEATURES OF ISL944xx FAMILY
PART
NUMBER
EARLY
WARNING
SWITCHING
FREQUENCY
(kHz)
SOFT-STARTING
TIME
(ms)
ISL9440 Yes 300 1.7
ISL9440A Yes 600 1.7
ISL9441 No 300 1.7
ISL9440B Yes 300 Programmable
ISL9440C Yes 600 Programmable
FIGURE 1. ISL9440AEVAL1Z EVALUATION BOARD
March 5, 2010
AN1551.0
Verzeichnis
