ISL78100 Intersil Corporation, ISL78100 Datasheet - Page 18

• Manufacturer Part Number: ISL78100
• Manufacturer: Intersil Corporation

Automotive Applications
The LED load and ISL78100 may be protected against load
dumps and other electrical faults in automotive supplies with
a minor addition to the standard application schematic:
• A reverse transient automotive-rated protection power
• A 500Ω current limit resistor must be inserted in series
• The fault protection NFET must be specified to handle
Automotive Boost Application Diagram
Automotive Minimum BOM Boost Application Diagram
Schottky must be added in series with the input supply
with the VBAT pin
100V VDS conditions.
V
V
BAT
BAT
R
500
LIM
18
FIGURE 40. AUTOMOTIVE MINIMUM BOM BOOST MODE APPLICATION
SENSOR
TEMP
V
V
LEVEL
FIGURE 39. AUTOMOTIVE BOOST MODE APPLICATION DIAGRAM
LEVEL
(0V TO 2.5V)
(0V TO 2.5V)
EN
EN
ISL78100
VIN
FAULT
VBAT
VDC
TEMP
TMAX
EN/PWM
MODE
LEVEL
BUCK/BOOSTN
VIN
FAULT
VBAT
VDC
TEMP
TMAX
EN/PWM
MODE
LEVEL
BUCK/BOOSTN
SWD1
SWD2
SWS1
SWS2
SWD1
SWD2
SWS1
SWS2
GND
OVP
ENL
GND
The protection circuit is applicable to buck, boost, and
supply-return load applications.
A small reduction in efficiency is caused by the drop in the
power Schottky.
Unless alternative transient protection is provided,
minimum BOM automotive applications must include the
circuit changes noted previously.
OVP
ENL
VHI
VHI
FB
FB
December 17, 2007
FN6626.0