Wide Input Voltage Range, High-Efficiency,

Fault-Tolerant LED Driver

A8519 and

A8519-1

6

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

INPUT VOLTAGE

●

4.5

–

40

V

UVLO Start Threshold

●

–

–

4.35

V

UVLO Stop Threshold

●

–

–

3.9

V

UVLO Hysteresis

300

450

600

mV

INPUT SUPPLY CURRENT

Input Quiescent Current

●

–

8

15

mA

Input Sleep Supply Current

●

–

2.0

10

µA

INPUT LOGIC LEVELS (PWM, APWM)

Input Logic Level Low

●

–

–

0.4

V

Input Logic Level High

●

1.5

–

–

V

PWM Input Pull-Down Resistor

60

100

140

kΩ

APWM Input Pull-Down Resistor

60

100

140

kΩ

APWM

●

40

–

1000

kHz

OUTPUT LOGIC LEVELS (CLKOUT)

Output Logic Level Low

●

–

–

0.3

V

Output Logic Level High

●

1.8

–

–

V

ERROR AMPLIFIER

Source Current

–

–600

–

μA

Sink Current

–

+600

–

μA

COMP Pin Pull-Down Resistance

–

1.4

–

kΩ

OVERVOLTAGE PROTECTION

OVP Pin Voltage Threshold

●

7

8.3

9.5

V

OVP Pin Sense Current Threshold

Current into OVP pin

●

190

200

210

μA

OVP Pin Leakage Current

●

–

0.1

1

μA

OVP Accuracy

–

–

5

%

Undervoltage Protection Threshold

–

3

–

V

–

0.55

0.7

V

Secondary Overvoltage Protection

Measured at SW pin

●

42

45

48

V

Continued on the next page…

1

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).

2

Ensured by design and characterization, not production tested.

3

4

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