A6268
Automotive High Current LED Controller
Features and Benefits
▪ AEC Q100 Grade 0 Automotive Qualified
▪ Constant current LED drive
▪ 5 to 50 V supply
▪ Boost or buck-boost modes
▪ Drives up to 15 LEDs in series
▪ Programmable switching frequency 100 to 700 kHz
▪ Open LED overvoltage indication and protection
▪ Single and multiple LED short indication
▪ LED short to ground and supply protection
▪ PWM dimming control
Description
The A6268 is a DC-to-DC converter controller, providing a
programmable constant current output for driving high power
LEDs in series. Driving the LEDs in series ensures identical
currents and uniform brightness. For automotive applications,
optimumperformanceisachievedwhendrivingupto15LEDs
at currents up to 1 A.
TheA6268 provides a cost-effective solution using an external
logic-level MOSFET and minimum additional external
components. The maximum LED current is set with a single
external sense resistor and can be modified using a current
reference input. Direct PWM control is possible via the Enable
input, which also provides a shutdown mode.
▪ 10 μA shutdown current including LED leakage
Applications:
ThisDC-DCconvertercanbeconfiguredasaground-referenced
boost converter or as a supply-referenced boost converter
providingbuck-boostcapability.Thebuck-boosttopologyused
ensures that there is no leakage path through the LEDs when
in shutdown and no inrush current at power-up.
▪ Automotive high power LED lighting systems
▪ Fog lights, reversing lights, daytime running lights
▪ Headlights
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Integrated diagnostics and two fault outputs give indication of
VIN and VREG undervoltage, chip overtemperature, output
open circuit, LED short circuit and LED undercurrent, and can
be configured to provide short to supply and short to ground
protection for the LED connections, LED overcurrent and
shorted LED string protection. A unique feature is the ability
to detect one or more shorted LEDs.
Thedeviceisprovidedina16-pinTSSOPpackagewithexposed
thermal pad (suffix LP). It is lead (Pb) free, with 100% matte
tin leadframe plating.
Not to scale
Typical Application Diagrams
(50 V max)
12 V or 24 V
V
(50 V max)
12 V or 24 V
V
BAT
BAT
Power net
Power net
VIN
VIN
VREG
VREG
LN
LP
LN
LP
Buck Boost Mode
VBAT(min) Maximum
Boost Mode
VBAT(min)
Maximum
Quantity of
LEDs
FF1
FF2
FF1
FF2
(V)
Quantity of
LEDs
(V)
Fault
Flags
Fault
Flags
5
6
7
8
9
7
5
6
7
8
9
8
LF
LF
A6268
A6268
8
10
12
13
15
EN
EN
Enable
Enable
10
11
13
SG
SP
SG
SP
IREF
CKOUT
IREF
CKOUT
Vf of each LED = 3.5 V,
D(max) = 85%
Vf of each LED = 3.5 V,
D(max) = 85%
SN
LA
OSC
GND
OSC
GND
SN
LA
Buck-Boost Mode
(Supply-referenced boost)
Boost Mode
A6268-DS, Rev. 1
5秒后页面跳转
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