A6267KLPTR-T

Part No.:
A6267KLPTR-T
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Description:
The A6267 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series.
File Size:
349 K
Page:
17 Pages
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Maker:
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
PCB Prototype

July 19, 2018:

A6E-0104

A-70216-0246

A-70400-0186

A-70475-2177

A-A71395-0164

ACE724

AD006-00

AD7492CB

AD8013

AD8048AR-REEL7

AD8325ARU-REEL

ADAU1979

PCB Datasheet:1PCB Datasheet:1PCB Datasheet:1
A6267
Automotive High Current LED Controller
Features and Benefits
AEC Q100 Grade 0 Automotive Qualified
Constant current LED drive
6.5 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
10
μA
shutdown current including LED leakage
Description
The A6267 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,
optimum performance is achieved when driving up to 15 LEDs
at currents up to 1 A.
The A6267 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.
This DC-DC converter can be configured as a ground-referenced
boost converter or as a supply-referenced boost converter
providing buck-boost capability. The buck-boost topology used
ensures that there is no leakage path through the LEDs when
in shutdown and no inrush current at power-up.
Integrated diagnostics and two fault outputs give indication of
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. A unique feature is the ability to detect one
or more shorted LEDs.
The device is provided in a 16-pin TSSOP package with exposed
thermal pad (suffix LP). It is lead (Pb) free, with 100% matte
tin leadframe plating.
Applications:
Automotive high power LED lighting systems
Fog lights, reversing lights, daytime running lights
Headlights
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Not to scale
Typical Application Diagrams
V
BAT
12 V or 24 V (50 V max)
Power net
VIN
V
BAT
12 V or 24 V (50 V max)
Power net
VIN
LN
LP
Buck Boost Mode
V
BAT
(min)
Maximum
(V)
Quantity of
LEDs
7
10
8
11
9
13
V
f
of each LED = 3.5 V,
D(max) = 85%
VREG
Fault
Flags
FF1
FF2
A6267
Enable
EN
IREF
CKOUT
OSC
GND
LF
SG
SP
Boost Mode
V
BAT
(min)
Maximum
(V)
Quantity of
LEDs
7
12
8
13
9
15
V
f
of each LED = 3.5 V,
D(max) = 85%
VREG
Fault
Flags
FF1
FF2
LN
LP
A6267
Enable
EN
IREF
CKOUT
OSC
GND
LF
SG
SP
SN
LA
SN
LA
Buck-Boost Mode
(Supply-referenced boost)
A6267-DS, Rev. 3
Boost Mode