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A6268KLPTR-T Datasheet(PDF) 1 Page - Allegro MicroSystems

Part # A6268KLPTR-T
Description  The A6268 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series.
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A6268KLPTR-T Datasheet(HTML) 1 Page - Allegro MicroSystems

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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,
optimum performance is achieved when driving up to 15 LEDs
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.
ThisDC-DCconvertercanbeconfiguredasaground-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
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.
A6268-DS, Rev. 1
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
▪ 10 μA shutdown current including LED leakage
Automotive High Current LED Controller
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Applications:
Typical Application Diagrams
Not to scale
A6268
Buck-Boost Mode
(Supply-referenced boost)
Boost Mode
▪ Automotive high power LED lighting systems
▪ Fog lights, reversing lights, daytime running lights
▪ Headlights
LN
LP
LF
SG
SP
SN
GND
LA
Fault
Flags
Power net
VREG
FF1
FF2
EN
IREF
CKOUT
OSC
Enable
A6268
VIN
VBAT 12 V or 24 V (50 V max)
GND
LA
VBAT 12 V or 24 V (50 V max)
LN
LP
LF
SG
SP
SN
Fault
Flags
Power net
FF1
FF2
EN
IREF
CKOUT
OSC
Enable
A6268
VREG
VIN
Boost Mode
VBAT(min)
(V)
Maximum
Quantity of
LEDs
58
610
712
813
915
Vf of each LED = 3.5 V,
D(max) = 85%
Buck Boost Mode
VBAT(min)
(V)
Maximum
Quantity of
LEDs
57
68
710
811
913
Vf of each LED = 3.5 V,
D(max) = 85%


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