1
®
AN1291.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL6228EVAL3Z User Guide
Introduction
The ISL6228EVAL3Z evaluation board demonstrates the
performance of the ISL6228 dual-channel PWM controller.
The ISL6228 features Intersil's Robust Ripple Regulator (R
3
)
technology. Channel-1 output voltage is 1.5V or 1.8V,
pending the state of switch S5. Channel-2 output voltage is
1.8V. Each channel has an on-board dynamic-load
generator included for evaluating the transient-load
response. It applies a 300µs pulse of 4.5A load across V
O1
and GND, and it applies a 300µs pulse of 5A load across
V
O2
and GND.
Contents of this document include:
• Recommended Test Equipment
• Interface Connections
• Switch Descriptions
• Test Point Descriptions
• Design Criteria
• Typical Performance
- Efficiency
- Start-up
- Shut-down
- Steady State, CCM
- Steady State, DCM
- Load-transient response
• Evaluation Board Documentation
- Bill of materials
- Schematic
- Silk-screen plots
- Board layer plots
Recommended Equipment
• (QTY 2) Adjustable 25V, 3A Power Supply
• (QTY 1) Fixed 5V, 100mA Power Supply
• (QTY 1) Fixed 12V, 100mA Power Supply
• (QTY 1) Adjustable 20A Constant Current Electronic Load
• (QTY 1) Digital Voltmeter
• (QTY 1) Four-Channel Oscilloscope
Interface Connections
• V
IN1
: Input voltage to the power stage of Channel-1
- J14: V
IN1
positive power input
- TP20: V
IN1
positive voltage sense
- J14: V
IN1
return power input
- TP21: V
IN1
return voltage sense
• V
IN2
: Input voltage to the power stage of Channel-2
- J1: V
IN2
positive power input
- TP9: V
IN2
positive voltage sense
- J2: V
IN2
return power input
- TP10: V
IN2
return voltage sense
• V
O1:
Regulated output voltage from Channel-1
- J9: V
O1
positive power output
- TP13: V
O1
positive voltage sense
- J10: V
O1
return power output
- TP14: V
O1
return voltage sense
• V
O2
: Regulated output voltage from Channel-2
- J7: V
O2
positive power output
- TP11: V
O2
positive voltage sense
- J8: V
O2
return power output
- TP12: V
O2
return voltage sense
• VCC: +5V input voltage
- TP1: 5V positive input
- TP2: 5V return input
• +12V: Input voltage for the dynamic-load generator
- TP15: 12V positive input
- TP16: 12V return input
TABLE 1. DC/DC DESIGN CRITERIA
PARAMETER
VALUE
UNITS
V
IN
3.3 to 25
VDC
V
O
0.6 to 5
VDC
Full-load
8
ADC
PWM Frequency
270, 300
kHz
Application Note
May 17, 2007
Author: Jia Wei
