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ISL62383LOEVAL1Z Datasheet PDF : 14 Pages
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ISL62383 Triple-Output Evaluation
®
Board User Guide
Application Note
July 31, 2008
AN1398.0
Introduction
The ISL62383 evaluation board demonstrates the
performance of ISL62383 triple-output controller. The
ISL62383 controller includes two pulse-width modulation
(PWM) controllers featured with Intersil’s patented R3
technology, adjustable from 0.6V to 5.5V, and one linear
regulator LDO5, which generates a fixed 5V output and can
deliver up to 100mA.
The evaluation board includes two independent Enable
switches, two LED Power-Good indicators and various test
points. Included with each switching channel is an on-board
dynamic load generator for evaluating the transient-load
response. There are two different evaluation boards which
provide flexible evaluation options. Table 1 shows a brief
description of the evaluation boards.
TABLE 1. EVALUATION BOARDS DESCRIPTION
EVALUATION BOARD CHANNEL-1 CHANNEL-2 OCP
ISL62383LOEVAL1Z
3.3V/8A
5V/8A
~10A
ISL62383HIEVAL1Z
1.05V/15A
1.5V/15A ~20A
What’s Inside
The Evaluation Board Kit contains the following materials:
• ISL62383xxEVAL1Z Evaluation Board
• ISL62383 Datasheet
• ISL62383 Evaluation Board User Guide (this document)
What’s Needed
The following materials will be needed in order to perform
testing:
• Adjustable +25V, 30A Power Supply
• +12V, 100mA Power Supply
• Precision Digital Multimeter
• 3 Electronic Loads
• 4-Channel Oscilloscope
Enable Control
The evaluation board provides flexible control logic to enable
or disable the outputs, and to program the two PWM
channels’ start-up sequence. For start-up timing sequence,
please refer to the ISL62383 datasheet waveforms. Table 2
is the Enable controller truth table.
EN1
Low
Low
Float
Float
Low
High
High
Float
High
TABLE 2. ENABLE TRUTH TABLE
EN2
START-UP SEQUENCE
Low Both Channels outputs OFF simultaneously
Float Both Channels outputs OFF simultaneously
Low Both Channels outputs OFF simultaneously
Float Both Channels outputs OFF simultaneously
High Channel-1 OFF, Channel-2 ON
Low Channel-1 ON, Channel-2 OFF
High Both Channels outputs ON simultaneously
High Channel-1 enabled after Channel-2 is in regulation
Float Channel-2 enabled after Channel-1 is in regulation
Resistor Current Sense Configuration
The Evaluation Board is pre-configured with inductor DCR
current sense. For more precise overcurrent protection, it
also provides the option of resistor current sense. Figure 1
shows the configuration for resistor current sense.
PHASEx
L
RSENSE IL
VO
+
_
VRSENSE
ISL62383
CO
10µA
ROCSET
OCSETx
_
+
VROCSET
RO
ISENx
FIGURE 1. RESISTOR CURRENT SENSE CIRCUIT
For Channel-1, the ISL62383 monitors the OCSET1 pin and
the ISEN1 pin voltages. Once the OCSET1 pin voltage is
higher than the ISEN1 pin voltage for more than 10µs, the
ISL62383 declares an overcurrent fault. For a chosen
overcurrent set point IOC and current sense resistor RSENSE,
the value of ROCSET is determined by Equation 1:
ROCSET
=
I--O-----C-----•--R-----S----E----N----S----E--
10 μ A
(EQ. 1)
Where:
- ROCSET (Ω) is the resistor used to program the
overcurrent setpoint
- IOC is the output current threshold that will activate the
OCP circuit
- RSENSE is current sense resistor (R3 for Channel-1;
R25 for Channel-2)
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. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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