1
Application Note 1946
ISL78268EVAL1Z
Evaluation
Board User Guide
Introduction
ISL78268 is an automotive grade synchronous buck controller
with the 2-A sourcing/3-A sinking Integrated MOSFET Drivers.
The device supports the wide input supply voltage range of 5V
to 55V for full operation and protected up to 60V when not
switching. The ISL78268EVAL1Z is a fully configured buck
converter evaluation board with ISL78268, MOSFETS, an
inductor, current sense resistors and other necessary
components. The evaluation board has been designed to
quickly evaluate the various features and performance of the
ISL78268.
Specification (Default Setting)
• V
IN
= 14V to 55V
• V
OUT
= 12V
• V
IN
overvoltage protection = 58V (rising threshold to trigger
hiccup or latch-off)
• Output overcurrent limit 1 (OC1: cycle-by-cycle) = 9.3A
• Output overcurrent limit 2 (OC2: hiccup/latch-off) = 12.4A
• Output average constant current limit = 4.05A (if activated)
• Switching frequency = 300kHz
• Peak efficiency > 95% (V
IN
= 15V/ I
OUT
= 4A)
Key Features
• Wide operational input voltage range up to 55V (switching),
withstand 60V (non-switching)
• Average output constant current limiting
• Selectable diode emulation mode or forced PWM mode
• Selectable switching clock source: internal or external
• Low shutdown current: I
Q
<10µA
• Selectable latch-off or hiccup mode fault response
• Comprehensive fault protections:
- Input and output overvoltage protection
- Cycle-by-cycle overcurrent limit (OC1) and
protection (OC2)
- Average current overcurrent protection
- Over-temperature protection
• Monitor test points for key signals
Reference
•
ISL78268
Datasheet
Ordering Information
PART NUMBER
DESCRIPTION
ISL78268EVAL1Z
ISL78268 Evaluation Board
HIC/LATCH : CONNECT TO
V
CC
FOR LATCH-OFF
MODE OR GND FOR
HICCUP MODE
ISL78268
VCC
BOOT
PH
FB
COMP
J1: VIN
LG
CLKOUT
PGOOD
UG
PGND
SS
PVCC
SLOPE
FSYNC
EN
VIN
ISEN1P
ISEN1N
PLL_COMP
ISEN2P
ISEN2N
HIC/LATCH
SGND
IMON/DE
VCC
VCC
VCC
IMON/DE:
V
CC
= FORCED PWM MODE
W/O ACL
GND = DE MODE W/O ACL
0V~2V = DE MODE W/ ACL
J2: GND
J12: VCC
J11: IMON/DE
J17: FSYNC
J7: COMP
J8: IMON/DE
J13: HIC/LATCH
J6: SS
J4
J28
J10: EN
J27: GND
J24
J21: PVCC
J26: VOUT
J19: CLKOUT
J14: PGOOD
J5: FB
J20: PHASE
J16
J9
J15
J18
J22
J23
FIGURE 1. ISL78268EVAL1Z BLOCK DIAGRAM
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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Copyright Intersil Americas LLC 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
July 7, 2014
AN1946.0
