A8509GLBTR-T Просмотр технического описания (PDF) - Allegro MicroSystems

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A8509GLBTR-T

Wide Input Voltage Range, High Efficiency 4-Channel Fault Tolerant LED Driver

Allegro MicroSystems 

A8509

Wide Input Voltage Range, High Efficiency

4-Channel Fault Tolerant LED Driver

ELECTRICAL CHARACTERISTICS1 (continued) Valid at VIN = 12 V, TA = 25°C, indicates specifications guaranteed by design

and characterization over the full operating temperature range with TA = TJ = –40°C to 105°C; unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Boost Switch Gate Driver (continued)

Soft Start Boost Current Limit

Reference Voltage

VSWSS(LIM)

Reference voltage for boost switch current

limit during soft start

−

39

−

mV

Minimum Switch On-Time

Minimum Switch Off-Time

Oscillator Frequency

tSWONTIME

tSWOFFTIME

−

−

110

ns

−

−

85

ns

Oscillator Frequency

FSET/SYNC Pin Voltage

Synchronization

fSW

VFSET

RFSET = 7.5 kΩ

RFSET = 10 kΩ

RFSET = 20 kΩ

RFSET = 8.25 kΩ

725

800

875

kHz

540

600

660

kHz

−

300

−

kHz

−

1.00

−

V

Synchronized PWM Frequency

Synchronization Input

Minimum Off-Time

fSWSYNC

tPWSYNCOFF

300

−

800

kHz

150

−

−

ns

Synchronization Input

Minimum On-Time

tPWSYNCON

150

−

−

ns

LED Current Sinks

LEDx Accuracy

LEDx Matching

LEDx Regulation Voltage

ISET to ILEDx Current Gain

ISET Pin Voltage

Allowable ISET Current

LEDx Pin Short Detect

ErrLED

ΔLEDx

VLED

AISET

VISET

ISET

VLEDSC

ISET = 80 μA

ISET = 80 μA

VLED1 through VLED4 all equal, ISET = 80 μA

ISET = 80 μA

While LED sinks are in regulation, sensed

from LEDx pin to GND

–

0.7

–

%

–

0.8

2.5

%

−

650

−

mV

−

2320

−

A/A

−

1.000

−

V

34

−

130

μA

4.6

−

−

V

Soft Start LEDx Current Gain

PWM High to LED-On Delay

ILEDSS

tdPWM(on)

Current through each enabled LEDx pin

during soft start, RISET = 12.4 kΩ

Time between PWM enable and LEDx

current reaching 90% of maximum

−

88

−

A/A

−

0.5

1.1

μs

PWM Low to LED-Off Delay

tdPWM(off)

Time between PWM enable going low and

LEDx current reaching 10% of maximum

−

−

500

ns

Continued on the next page…

Allegro MicroSystems, Inc.

6

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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