ISL78100_15 Datasheet, PDF (18/19 Pages) Intersil Corporation – High Power LED Driver

ISL78100
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
Schottky must be added in series with the input supply
• A 500 current limit resistor must be inserted in series
with the VBAT pin
• The fault protection NFET must be specified to handle
100V VDS conditions.
Automotive Boost Application Diagram
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.
V_BAT
R_LIM
500
TEMP
SENSOR
EN
V_LEVEL (0V TO 2.5V)
VIN
VHI
FAULT SWD1
VBAT
SWD2
VDC
OVP
TEMP
SWS1
TMAX
SWS2
EN/PWM ENL
MODE
FB
LEVEL
GND
BUCK/BOOSTN
FIGURE 39. AUTOMOTIVE BOOST MODE APPLICATION DIAGRAM
Automotive Minimum BOM Boost Application Diagram
V_BAT
EN
V_LEVEL (0V TO 2.5V)
VIN
VHI
FAULT SWD1
VBAT
SWD2
VDC
OVP
TEMP
SWS1
TMAX
SWS2
EN/PWM ENL
MODE
FB
LEVEL
GND
BUCK/BOOSTN
FIGURE 40. AUTOMOTIVE MINIMUM BOM BOOST MODE APPLICATION
18
FN6626.1
December 24, 2013