A8515 Ver la hoja de datos (PDF) - Allegro MicroSystems

Número de pieza

componentes Descripción

Lista de partido

A8515

Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver

Allegro MicroSystems 

A8515

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

ELECTRICAL CHARACTERISTICS1 (continued) Valid at VIN = 16 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.2

Max.

Unit

Oscillator Frequency

Oscillator Frequency

FSET/SYNC Pin Voltage

FSET Frequency Range

Synchronization

fSW

VFSET

fFSET

RFSET = 10 kΩ

RFSET = 20 kΩ

RFSET = 35.6 kΩ

RFSET = 10 kΩ

1.8

2

2.2

MHz

−

1

−

MHz

−

580

−

kHz

−

1.00

−

V

580

−

2500

kHz

Synchronized PWM Frequency

Synchronization Input

Minimum Off-Time

fSWSYNC

tPWSYNCOFF

580

−

2300

kHz

150

−

−

ns

Synchronization Input

Minimum On-Time

tPWSYNCON

150

−

−

ns

SYNC Input Logic Voltage

LED Current Sinks

VSYNC(H) FSET/SYNC pin, high level

VSYNC(L) FSET/SYNC pin, low level

−

−

0.4

V

2.0

−

−

V

LEDx Accuracy

ErrLED ISET = 120 μA

−

0.5

2

%

LEDx Matching

LEDx Regulation Voltage

ISET to ILEDx Current Gain

ISET Pin Voltage

Allowable ISET Current

VLED Short Detect

ΔLEDx

VLED

AISET

VISET

ISET

VLEDSC

ISET = 120 μA

VLED1 = VLED2 , ISET = 120 μA

ISET = 120 μA

While LED sinks are in regulation, sensed

from LEDx pin to GND

−

0.5

1

%

−

720

−

mV

960

980

1000

A/A

−

1.003

−

V

40

−

125

μA

4.6

−

−

V

Soft Start LEDx Current

ILEDSS

Current through each enabled LEDx pin

during soft start

−

3.2

−

mA

Maximum PWM Dimming

Until Off-Time

tPWML

Measured while EN/PWM = low, during

dimming control and internal references

are powered-on (exceeding tPWML results in

shutdown)

−

32,750

−

fSW

cycles

Minimum PWM On-Time

tPWMH First cycle when powering-up device

−

0.75

2

μs

EN/PWM High to LED-On Delay

tdPWM(on)

Time between PWM enable and LED current

reaching 90% of maximum

−

0.5

1

μs

EN/PWM Low to LED-Off Delay

tdPWM(off)

Time between PWM enable going low and

LED current reaching 10% of maximum

−

−

500

ns

GATE Pin

Gate Pin Sink Current

Gate Fault Shutdown

Gate Voltage

IGSINK VGS = 0 V with respect to VIN

−

−104

−

μA

tGFAULT

−

−

3

μs

VGS

Gate to source voltage measured when gate

is on

−

-6.7

−

V

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

Share Link: