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Allegro MicroSystems - High Current LED Controller

Numéro de référence A6266
Description High Current LED Controller
Fabricant Allegro MicroSystems 
Logo Allegro MicroSystems 





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A6266 fiche technique
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A6266
Automotive, Boost, High Current LED Controller
Features and Benefits
AEC Q100 Grade 0 Automotive Qualified
Constant current LED drive
5 to 50 V supply
Boost mode
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
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)
Description
The A6266 is a boost 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.
TheA6266 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.
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-pinTSSOPpackage with exposed
thermal pad (suffix LP). It is lead (Pb) free, with 100% matte
tin leadframe plating.
Not to scale
Typical Application Diagram
12 V or 24 V (50 V max)
Power net
Boost Mode
VBAT(min)
(V)
Maximum
Quantity of
LEDs
6 10
7 12
8 13
9 15
Vf of each LED = 3.5 V,
VBAT measured at VIN pin
D = 85%
Fault
Flags
Enable
VIN
VREG
LN
LP
FF1
FF2
A6266 LF
EN
SG
IREF
CKOUT
SP
OSC
GND
SN
LA
A6266-DS, Rev. 1
Datasheet pdf - http://www.DataSheet4U.net/

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