1
Application Note AN1553
ISL62881CGPUEVAL2Z Evaluation Board User Guide
Hardware Description
The ISL62881CGPUEVAL2Z evaluation board
demonstrates the performance of the ISL62881C
single-phase synchronous-buck PWM GPU V
CORE
controller implementing Intel IMVP-6.5 protocol. The
ISL62881C features Intersil's Robust Ripple Regulator
(R
3
™) technology. An on-board dynamic-load generator
is included for evaluating the transient-load response. It
applies a 300µs pulse of approximately 0.2
Ω
load across
V
O
and PGND.
Contents of this document include:
• Design Criteria
• Recommended Test Equipment
• Interface Connections
• Switch Descriptions
• DIP Switch Descriptions
• Jumper Descriptions
• Test Point Descriptions
• Evaluation Board Documentation
- Bill of materials
- Schematic
- Silk-screen plots
- Board layer plots
Recommended Equipment
• (Qty. 1) Adjustable 25V, 10A Power Supply
• (Qty. 1) Fixed 5V, 100mA Power Supply
• (Qty. 1) Fixed 12V, 100mA Power Supply
• (Qty. 1) Adjustable Constant Current Electronic Load
• (Qty. 1) Digital Voltmeter
• (Qty. 1) Four-Channel Oscilloscope
Interface Connections
• V
IN
: Input Voltage to the Power Stage
- J5: V
IN
Positive Power Input
- TP31: V
IN
Positive Voltage Sense
- J6: V
IN
Return Power Input
- TP32: V
IN
Return Voltage Sense
• V
O:
Regulated Output Voltage
- J12: V
O
Positive Power Output
- J14: V
O
Return Power Output
• +5V: +5V Input Voltage
- TP29: +5V Positive Input
- TP30: +5V Return Input
• +12V: Input Voltage for the Dynamic-load Generator
- TP3: 12V Positive Input
- TP2: 12V Return Input
Test Set-Up
FIGURE 1. TEST SET-UP
Switch Descriptions
• S3: Enable
- OFF: Short the VR_ON pin to GND (disable PWM)
- ON: Allow the VR_ON pin to pull-up to +5V
(enable PWM)
• S2: Dynamic Load
- OFF: On-board dynamic load disabled
- ON: On-board dynamic load enabled
TABLE 1. DC/DC DESIGN CRITERIA
PARAMETER
VALUE
UNITS
V
IN
4.5 to 20
VDC
V
O
0 to 1.5
VDC
Full-load
26
ADC
PWM Frequency
300
kHz
1
0
U2
ISL62881CGPUEVAL2Z
on
off
0
1
TP37
TP29
TP30
VID0
VID1
VID2
VID3
VID4
VID5
VID6
Vin
+
_
TP18 TP14
VSEN
RTN
J10
VCORE
on
off
S3
S2
TP3
TP2
5V
+
_
J12
VCORE
J14
PGND
S1
D
P
RSL
PVR
+3.3V
+5V
PGND
J6
PGND
J5
VIN
D1
J16
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.
March 24, 2010
AN1553.0
Author: Jia Wei
