Description
The A6265 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 between
2 and 10 LEDs at currents up to 1 A.
The A6265 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.
A6265-DS, Rev. 6
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 between 2 and 10 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 A 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
A6265
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
V
BAT
12 V or 24 V
Power net
(50 V max)
VREG
FF1
FF2
EN
IREF
CKOUT
OSC
Enable
6265
VIN
GND
LA
V
BAT
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
6265
VREG
VIN
Boost Mode
V
BAT
(min)
(V)
Maximum
Quantity of
LEDs
712
813
915
V
f
of each LED = 3.5 V,
D(max) = 85%
Buck Boost Mode
V
BAT
(min)
(V)
Maximum
Quantity of
LEDs
710
811
913
V
f
of each LED = 3.5 V,
D(max) = 85%
