Datasheet > A6271

A6271

更新时间： 2024-11-06 01:19:47

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
36页	654K
描述
Automotive, High-Current LED Controller

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A6271 数据手册

A6271

Automotive, High-Current LED Controller

FEATURES AND BENEFITS

• Automotive AEC-Q100 qualified

• Constant-current LED drive

DESCRIPTION

The A6271 is a DC-DC converter controller, providing a

programmable constant-current output for drivinghigh-power

LEDs in series. The controller is based on a programmable

fixed-frequency, peak current-mode control architecture. The

DC-DC converter can be configured in a myriad of different

switching configurations including boost, buck-boost, and

buck (ground-referenced switch).

• 4.2 to 50 V supply

• 53.3 V maximum LED string voltage

• Boost, buck-boost, and buck switching converters

• Programmable switching frequency 70 to 700 kHz

• PWM-controlled PMOS driver allows accurate LED

current control at low duty cycles

TheA6271 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 accurately modulated using

a current reference input (analog control). External PWM

dimmingispossibleviathePWMINinput,whichalsoprovides

ashutdownmode.Asanalternative,aninternalPWMdimming

circuit can be used by programming the PWMIN and DR pins.

Either PWM scheme controls the PWMOUT output which

drives an external p-channel MOSFET connected in series

with the LED string. This MOSFET is also used to isolate the

load during certain fault conditions, including output shorts

to ground.

• Dimming via external PWM, internal PWM and/or

analog dimming

• Frequency dither scheme for effective spread spectrum to

reduce EMI

• Comprehensive fault protection and fault flag

PACKAGES:

16-Pin eTSSOP (LP)

with Exposed Thermal Pad

Continued on next page...

APPLICATIONS

• Automotive high-power LED lighting systems

• Fog lights, reversing lights, daytime running lights,

position lights, headlights

Not to scale

56 µH

VBAT

4.7 µF

150 Ω

1.35 Ω

47 nF

VIN

PWMOUT

OVUV

VREG

GND

1 µF

2.7 kΩ

FAULTn

LED1

4.3 k

A6271

4.4 µF

12 Ω

PWMIN

IREF

PWM Control

R11

LED14

240 kΩ

OSC

DITH

COMP

1.3 kΩ

39 Ω

22 pF

R10

75 mΩ

110 kΩ

73.2 kΩ

22 nF

680 nF

GND

Boost Switcher Driving 14 LEDs at 150 mA

A6271-DS, Rev. 5

December 2, 2016

12 3 4 5 6 7...36

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