Datasheet > A6284

A6284

更新时间： 2024-01-05 01:13:46

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
24页	608K
描述
Linear Current Regulator and Controller for Automotive LED Arrays

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中文翻译

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技术参数
数据手册

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A6284 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	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	1.7
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

A6284 数据手册

Linear Current Regulator and Controller

for Automotive LED Arrays

A6274, A6274-1

A6284, A6284-1

FUNCTIONAL DESCRIPTION

Powering Up

COMP

The A6274/84 can be enabled either by ENx inputs or by input

voltage as shown in Figure 3 and 4 respectively. In both cases, the

IC starts when the internal bias circuit voltage, V_BIAS, rises above its

starting level, V_BIASSTART. Any existing latched fault is cleared.

GATE

VIN

OUT

LED1

LED2

LED3

LED4

LED5

LED6

GND

EN1

EN2

BIAS

VTH

The IC shuts down when input voltage or both ENx inputs fall such

that the internal bias circuit voltage, V_BIAS, drops below its stopping

A6274-84

level, V_BIASSTOP

3.3 kΩ

EN1 is the active-high-enable input for LED1-3 while EN2 is the

active-high-enable input for LED4-6. To drive all the LED strings

with common EN input, connect EN1 and EN2 together. EN1 and

EN2 pins are high-voltage tolerant and can be directly connected to a

power supply.

FFn

PWMIN

ISET1

ISET2

Refer to Figure 3 for startup with ENx. Once ENx goes high,

the BIAS regulator is allowed to start after a few microsec-

onds internal delay (A to B), and the IC powers up when

V_BIAS> V_BIASSTART(at C). Once the IC powers up, it will

check LEDx pin voltage to identify if any LEDx pin is used,

unused, or shorted to ground.

Figure 2: Channel-select setup using LED1-4; LED5-6 un-

used. LED5-6 connected through 3.3 kΩ resistor to GND.

All unused pins must be connected with a resistor connected from

LEDx to ground, as shown in Figure 2. LEDx pins source I_LEDsrd

current. Voltage on an LEDx pin, when connected through resis-

After startup, for the time period of t_LEDdet(C to D), the IC

detects unused LED sink pins by injecting current I_LEDsrcto

LEDx pins and measures voltage on the LEDx pins. If the LEDx

voltage is equal to V_LEDx(NULL), the IC detects it as an unused

channel and disables the corresponding LEDx channel. The inter-

nal current source, I_LEDsrc, is removed after t_LEDdettime period

and disabled strings will be removed from the regulation loop.

The unused pin, with the pull-down resistor, will be taken out of

regulation at this point and will not contribute to the series-pass

regulation loop or fault detection. The FFn pin remains high dur-

ing the t_LEDdetperiod. The enabled strings will be continuously

monitored, and can be treated as a fault after the t_LEDdetperiod.

tor, will be V_LEDx(NULL)

FULL and DIM Mode

When the DR pin voltage is above V_DRDC(MAX), the LEDs

operate with 100% duty cycle (FULL mode). In FULL mode,

the LEDs turn on with 100% duty cycle regardless of internal

or external PWM mode. When the DR pin voltage is lower than

V_DRDC(MAX), the LEDs operate with PWM dimming (DIM

mode). PWM frequency and duty cycle in DIM mode is con-

trolled by the PWMIN and DR pins.

Table 1: LED Detection Voltage Thresholds

LED Pin Voltage Level

LED Pin

Action

V_LED(SC)(<160 mV)

Indicates short-to-ground

FFn goes low after t_LEDdettime period.

V_LEDx(NULL)

(>180 mV, <340 mV)

Unused LEDx is removed from regulation loop. Related sink remains disabled and

latched until it is re-enabled.

Not used

_{LEDx(NULL,max)}(>400 mV)

LED pin in use

None

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

1...5 6 789 10 11...24

中文翻译

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