A8519KETTR-R datasheet(7/35 Pages) ALLEGRO

7 / 35 page

Wide Input Voltage Range, High-Efficiency,

Fault-Tolerant LED Driver

A8519 and

A8519-1

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

BOOST SWITCH

Switch On-Resistance

RSW

ISW = 0.75 A, VIN = 16 V

●

100

250

500

mΩ

Switch Leakage Current

ISW(LKG)

VSW = 16 V, VPWM = VIL

●

–

0.1

μA

Switch Current Limit

ISW(LIM)

●

3.65

4.5

Secondary Switch Current Limit [2]

ISW(LIM2)

Higher than max ISW(LIM) under all conditions

part latches when detected

–

4.9

–

Minimum Switch On-Time

tSW(on)

●

Minimum Switch Off-Time

tSW(off)

●

–

OSCILLATOR FREQUENCY

Oscillator Frequency [5]

fSW

RFSET = 10 kΩ

●

1.95

2.15

2.35

MHz

RFSET = 21.5 kΩ

●

0.9

1.1

MHz

RFSET = 110 kΩ

–

200

–

kHz

Oscillator Frequency Dithering Range

fSW_DITH

RFSET = 10 kΩ

–

±5

–

Dithering Modulation Frequency

fSW_MOD

RFSET = 10 kΩ

–

12.5

–

kHz

FSET Pin Voltage

VFSET

A8519, RFSET = 10 kΩ

–

1.02

–

A8519-1, RFSET = 10 kΩ

–

1.07

–

SYNCHRONIZATION

Sync Input Logic Level

VSYNCL

FSET pin logic Low

●

–

0.4

VSYNCH

FSET pin logic High

●

–

Synchronized PWM Frequency

fSW(sync)

●

260

–

2300

kHz

Synchronization Input Min. Off-Time

tSYNC(off)

●

150

–

Synchronization Input Min. On-Time

tSYNC(on)

●

150

–

LED CURRENT SINKS

LEDx Accuracy [4]

ErrLED

RISET = 8.33 kW

●

–

0.7

LEDx Matching

ΔLEDx

IISET = 120 µA

●

–

0.8

LEDx Regulation Voltage

VLEDx

VLED1 = VLED2 = VLED3 = VLED4,

IISET = 120 µA

●

750

850

975

ISET to ILEDx Current Gain

AISET

IISET = 120 µA

●

696

710

727

A/A

ISET Pin Voltage

VISET

0.987

1.017

1.047

Allowable ISET Current

IISET

●

–

144

µA

VLEDx Short detect

VLEDx(SC)

While LED sinks are in regulation; sensed from

VLEDx to AGND

●

4.7

5.2

5.7

LED Startup Ramp Time [2]

tSS

Time duration before all LED channels come

into regulation, or OVP is tripped

–

ELECTRICAL CHARACTERISTICS [1]: Unless otherwise specified, specifications are valid at VIN = 16 V, TA= 25°C; ● indicates

specifications guaranteed over the full operating temperature range with TA = TJ = -40°C to 125°C; typical specifications are at TA = 25°C

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Continued on the next page…

For input and output current specifications, negative current is defined as coming out of the node or pin (sourcing); positive current is defined as going into the node or pin

(sinking).

Ensured by design and characterization, not production tested.

Minimum VIN = 4.5 V is only required at startup. After startup is completed, IC can continue to operate down to VIN = 3.9 V

LED current is trimmed to cancel variations in both Gain and ISET voltage

fSW measurements were taken with dithering function is disabled.

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