A8519KETTR-R datasheet(25/35 Pages) ALLEGRO

25 / 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

Fault Protection During Operation

The A8519 series devices constantly monitor the state of the

system to determine if any fault conditions occur during normal

operation. The response to a triggered fault condition is sum-

marized in the table below. There are several points at which the

A8519 monitors for faults during operation. The locations are

input current, switch current, output voltage, switch voltage, and

LED pins. (Note: Some protection features might not be active

during startup to prevent false triggering of fault conditions.)

The detectable fault conditions are:

•

Open LED pin

•

Shorted LED pin to GND

•

Open or shorted inductor

•

Open or shorted boost diode

•

Shorted inductor

•

VOUT short to GND

•

SW pin shorted to GND

•

ISET pin shorted to GND

•

Input disconnect switch source shorted to GND

Note: Some faults will not be protected if the input disconnect

switch is not used. An example of this is VOUT short to GND.

A8519KETTR-R Arkusz danych(PDF) 25 Page - Allegro MicroSystems