Datasheet > A6284KLPTR-T-1

A6284KLPTR-T-1

更新时间： 2024-01-13 20:25:33

品牌	Logo	应用领域
急速微 - ALLEGRO		开关
页数	文件大小	规格书
24页	564K
描述
IC LED DRVR LINEAR 120MA 20TSSOP

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技术参数
数据手册

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A6284KLPTR-T-1 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	,
Reach Compliance Code：	compliant	风险等级：	1.72
模拟集成电路 - 其他类型：	SWITCHING CONTROLLER	湿度敏感等级：	2
峰值回流温度（摄氏度）：	NOT SPECIFIED	处于峰值回流温度下的最长时间：	NOT SPECIFIED
Base Number Matches：	1

A6284KLPTR-T-1 数据手册

Linear Current Regulator and Controller

for Automotive LED Arrays

A6274, A6274-1

A6284, A6284-1

used, the LED string short faults B and C will be disabled.

Operation without External P-Channel MOSFET

An external P-channel MOSFET should be used to minimize

power dissipation in the IC; however, the A6274/84 can be used

without an external MOSFET for low-power applications, as

shown in Figure 17. The IC will detect but not be able to protect

external components in case of A, D, and E faults. See Fault

Table for more details.

Binning Resistor Arrangement

An external binning resistor can be connected in series with the

ISETx pins as shown in Figure 19, to set appropriate current

through various LED batches.

Connect the GATE and COMP pins to VIN when an external

PMOS is not connected. When the PMOS preregulator is not

COMP

GATE

VIN

OUT

LED1

LED2

LED3

LED4

LED5

LED6

EN1

EN2

BIAS

VTH

DIM

COMP

FULL

GATE

OUT

LED1

LED2

LED3

LED4

LED5

LED6

GND

A6274-84

VIN

EN1

EN2

EN1

EN2

FFn

BIAS

VTH

PWMIN

0.1 µF

A6274-84

R8a

R9a

R9b

ISET1

ISET2

FFn

GND

R8b

PWMIN

LED Module

ISET1

ISET2

Figure 19: Application Circuit for Binning

Current-setting resistor can be placed on LED board for different

bins of LEDs.

Figure 17: Operation without External P-Channel MOSFET

Connect COMP and GATE pins to VIN when external PMOS not used.

DIM

COMP

FULL

GATE

VIN

OUT

LED1

LED2

LED3

LED4

LED5

LED6

GND

1 MΩ

DIM

EN1

EN2

From MCU

EN1

EN2

BIAS

VTH

COMP

FULL

GATE

VIN

OUT

LED1

LED2

LED3

LED4

LED5

LED6

GND

A6274-84

EN1

EN2

BIAS

VTH

FFn

PWMIN

A6274-84

ISET1

ISET2

FFn

PWMIN

Figure 20: Application Circuit to Protect Microcontroller

ISET1

ISET2

in Case of Accidental VIN Short to EN1

EN1 and VIN pins are close to each other. EN1 pin is rated for full

supply voltage but external driving microcontroller may be damaged

with VIN short. Adding a zener clamp will protect MCU.

Figure 18: Floating Gate Protection

Add 1 MΩ resistor across MOSFET gate-source to prevent Q1 turn on

in case of floating GATE pin.

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

1...18 19 202122 23 24

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