ISL6440EVAL1Z Intersil, ISL6440EVAL1Z Datasheet
ISL6440EVAL1Z
Manufacturer Part Number
ISL6440EVAL1Z
Description
EVALUATION BOARD FOR ISL6440
Manufacturer
Intersil
Specifications of ISL6440EVAL1Z
Main Purpose
DC/DC, Step Down
Outputs And Type
2, Non-Isolated
Voltage - Output
1.8V, 3.3V
Current - Output
2A, 2A
Voltage - Input
12V
Regulator Topology
Buck
Frequency - Switching
300kHz
Board Type
Fully Populated
Utilized Ic / Part
ISL6440
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Using the Evaluation Board
The ISL6440 is a high performance triple-output controller
offering control and protection features for 2 synchronous
buck PWMs.
The ISL6440 evaluation board highlights the operation of the
IC in an embedded DC/DC converter application. Table 1
shows the available evaluation board.
Recommended Test Equipment
• A 12V, 5A capable power supply
• An electronic load
• Four channel oscilloscope with probes
• Precision digital multimeters
Power and Load Connections
Input Voltage - To connect a +12V power supply to the
evaluation board, connect the positive lead of the power supply
to VIN (P1) post and the ground lead of the supply to the GND
(P2) post.
Output Adjustment
Change the respective output voltage feedback resistors to
modify the output voltage:
ISL6440EVAL1Z
V
OUT1
BOARD NAME
=
0.8
⋅
TABLE 1. EVALUATION BOARDS
⎛
⎜
⎝
1
+
R
------ -
R
5
6
⎞
⎟
⎠
ISL6440IAZ
®
1
IC
V
OUT2
Application Note
=
24 Ld QSOP
0.8
PACKAGE
⋅
⎛
⎜
⎝
1
+
R
------ -
R
7
8
(EQ. 1)
1-888-INTERSIL or 1-888-468-3774
⎞
⎟
⎠
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Using the ISL6440 Evaluation Board
Soft-start and Shutdown
The soft-start capacitors can be adjusted for sequencing of
the output voltages, PWM startup tracking, and/or to adjust
the startup current required to charge the output capacitors.
To independently shutdown the PWMs, the SD1 or SD2 pin
can be pulled to GND using the on board posts, P7 and P8
respectively.
Power Good
When both PWMs are within ±10% of their set value, the
PGOOD signal will go high. The open drain PGOOD pin is
pulled HIGH to VCC_5V on the board. The PGOOD circuitry
monitors the FBx pin of each regulated output to determine if
the outputs are in regulation. PGOOD can be monitored at
post P9.
Overcurrent Protection
The overcurrent thresholds can be adjusted on the ISL6440
evaluation board. The current sense resistors, I
set at 1.0k. The overcurrent set resistor is 95.3k. The
overcurrent trip point can be adjusted by modifying R
R3 and R4:
R
sense resistor, I
r
MOSFET. Refer to the ISL6440 datasheet for more
information on how to select the current sense and
overcurrent select resistors.
R
t
DS(ON)
SS PWM1
OCSET
OCSET
(
January 8, 2007
is the on resistance of the respective PWM’s lower
All other trademarks mentioned are the property of their respective owners.
is the overcurrent set resistor, R
=
)
|
------------------------------------ -
I
=
Intersil (and design) is a registered trademark of Intersil Americas Inc.
OC
C
7 R
⋅
5
OC
⋅
r
⋅
DS ON
0.8V
------------
5μA
Copyright © Intersil Americas Inc. 2006. All Rights Reserved
CS
is the desired overcurrent trip point, and
(
)
t
SS PWM2
(
CS
)
is the current
=
AN1219.1
C
SENSE
3
⋅
0.8V
------------
5μA
OCSET
(EQ. 2)
, are
(EQ. 3)
,
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ISL6440EVAL1Z Summary of contents
Page 1
... The ISL6440 evaluation board highlights the operation of the embedded DC/DC converter application. Table 1 shows the available evaluation board. TABLE 1. EVALUATION BOARDS BOARD NAME IC ISL6440EVAL1Z ISL6440IAZ Recommended Test Equipment • A 12V, 5A capable power supply • An electronic load • Four channel oscilloscope with probes • ...
Page 2
... ISL6440EVAL1Z Schematic ...
Page 3
... ISL6440EVAL1Z Bill of Materials ITEM REFERENCE QTY 1 P1-P9 9 1514 BAT54HT1G H1045-00105-6R3V10 C9, C10 2 10TPB220M 5 C1 C3225X7R1E106 6 L1 DO3316P-682ML H1045-00105-16V20 FDS6912A 9 C5, C6, C7 H1045-00104-25V10-T 10 R1, R2 ISL6440IAZ ISL6440EVAL1Z Layout TOP SILK 3 Application Note 1219 PART NUMBER PART TYPE Test Point Diode, Schottky ...
Page 4
... ISL6440EVAL1Z Layout (Continued) LAYER 2 LAYER 4 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 ...