Wide Input Voltage Range, High-Efficiency,

Fault-Tolerant LED Driver

A8519 and

A8519-1

8

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

PWM DIMMING

Maximum PWM Dimming Until Off-

Measured while PWM = low, during dimming

control and internal references are powered on

–

32750

–

cycles

Minimum PWM On-Time

3.3 V)

●

–

0.75

2

µs

Subsequent PWM pulses

●

–

0.5

1

µs

PWM High to LED On Delay

Time between PWM going high and when LED

3.3 V)

●

–

0.2

0.5

µs

PWM Low to LED Off Delay

Time between PWM going low and when LED

to 0 V)

●

–

0.36

0.5

µs

HYSTERESIS CONTROL

Hysteresis Window (A8519)

Measured at VOUT pin when PWM = H to L

–

0.35

–

V

Hysteresis Window (A8519-1)

Measured at VOUT pin when PWM = H to L

–

0.15

–

V

GATE PIN

Gate Pin Sink Current

–

–113

–

μA

Gate Pin Source Current

–

6

–

mA

Gate Shutdown Delay When

–

–

3

µs

Gate Voltage

Measured between GATE and VIN when gate

is on

–

–6.7

–

V

VSENSE PIN

VSENSE Pin Sink Current

●

17.2

21.5

25.8

µA

VSENSE Trip Point

●

95

110

125

mV

FAULT PIN

FAULT Pull-Down Voltage

–

–

0.5

V

FAULT Pin Leakage Current

–

–

1

µA

THERMAL PROTECTION (TSD)

Temperature rising

155

170

–

°C

–

20

–

°C

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

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