Datasheet > A6268KLPTR-T

A6268KLPTR-T

更新时间： 2022-04-08 10:37:30

品牌	Logo	应用领域
急速微 - ALLEGRO		转换器驱动控制器
页数	文件大小	规格书
19页	369K
描述
The A6268 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series.

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A6268KLPTR-T 数据手册

A6268

Automotive High Current LED Controller

ELECTRICAL CHARACTERISTICS¹(continued) Valid at T_J= –40°C to 150°C, V_IN= 5 to 40 V; unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Diagnostics and Protection (continued)

LED String Short Voltage

V_SCL

V_SCO

350

150

475

225

600

300

Non-Reference LED Short Offset

Voltage

Reference LED Short Offset Voltage

LED Open Voltage

V_SCOR

V_OCL

I_LF

350

475

5.5

600

LF Bias Current (BB mode)³

LA Bias Current (BB mode)³

LF Bias Current (B mode)³

LF = LA = VIN + 1.7 V

–

μA

I_LA

LF = LA = VIN + 1.7 V

LF = 1.7 V

–

I_LF

–

LA Bias Current (B mode)³

I_LA

LA = 1.7 V

–

LED Undercurrent Voltage Difference⁶

LED Overcurrent Voltage Difference⁷

V_UCL

V_OVCL

–

LED Sense Resistor Negative

Overcurrent Threshold⁸

V_NOCL

V_NOCL= V_LP– V_LN

–

–200

–

Open Fault Time-Out

t_OTO

T_JF

f_OSC= 350 kHz

–

170

–

ºC

Overtemperature Warning Threshold

Overtemperature Hysteresis

Temperature increasing

Recovery = T_JF– T_Jhys

T_Jhys

¹For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.

²Function is correct but parameters are not guaranteed below the general limit (5 V).

³BB mode = buck-boost (supply-referenced) mode, B mode = boost (ground-referenced) mode.

⁴Parameters guaranteed by design.

⁵Fault Blank timer not enabled for open-LED condition.

⁶Undercurrent when V_SENSEL< V_IDL– V_UCL, where V_SENSELis the voltage across the LED current sense resistor R_SL

⁷Overcurrent when V_SENSEL> V_IDL+V_OVCL, where V_SENSELis the voltage across the LED current sense resistor R_SL

⁸Protection only provided in buck-boost mode with LED cathode (LP) connection shorted to ground.

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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