A8514KLPTR-T Allegro Microsystems Inc, A8514KLPTR-T Datasheet - Page 25

• Manufacturer Part Number: A8514KLPTR-T
• Description: IC LED DVR WHT 4X80MA 16-ETSSOP
• Manufacturer: Allegro Microsystems Inc

Specifications of A8514KLPTR-T

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

A8514
Fault Mode Table (continued)
ISET Short Protection
LED Short Protection
FSET/SYNC Short
Overtemperature
LED Pin Short
LED Pin open
Fault Name
Overvoltage
VIN UVLO
Protection
Protection
Protection
Protection
Auto-restart
Auto-restart
Auto-restart
Auto-restart
Auto-restart
Auto-restart
Auto-restart
Auto-restart
Type
Operation
Active
Startup
Normal
Always
Always
Always
Always
Always
Always
Fault
Flag
Set
Yes
No
No
No
No
No
No
No
Wide Input Voltage Range, High Efficiency
This fault prevents the device from starting-up if
either of the LEDx pins are shorted. The device
stops soft-start from starting while either of the
LEDx pins are determined to be shorted. After the
short is removed, soft-start is allowed to start.
When an LEDx pin is open the device will determine
which LED pin is open by increasing the output
voltage until OVP is reached. Any LED string not
in regulation will be turned off. The device will then
go back to normal operation by reducing the output
voltage to the appropriate voltage level.
This fault occurs when the ISET current goes above
150% of the maximum current. The boost will stop
switching, the disconnect switch will turn off, and
the IC will disable the LED sinks until the fault is
removed. When the fault is removed the IC will try
to to regulate to the preset LED current.
Fault occurs when the FSET/SYNC current goes
above 150% of maximum current, about 180 μA.
The boost will stop switching, the disconnect switch
will turn off, and the IC will disable the LED sinks
until the fault is removed. When the fault is removed
the IC will try to restart with soft-start.
Fault occurs when OVP pin exceeds V
threshold. The A8514 will immediately stop
switching to try to reduce the output voltage. If the
output voltage decreases then the A8514 will restart
switching to regulate the output voltage.
Fault occurs when the LED pin voltage exceeds
V
the LED string that is above the threshold will be
removed from operation.
Fault occurs when the die temperature exceeds the
overtemperature threshold, 165°C.
Fault occurs when V
maximum. This fault resets all latched faults.
LEDSC
. When the LED short protection is detected
Description
IN
drops below V
Fault Tolerant LED Driver
UVLO
OVP(th)
, 4.35 V
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
Boost
during
event.
Stop
OVP
Off
On
Off
Off
On
Off
Off
Disconnect
Switch
On
On
On
Off
On
On
Off
Off
shorted
driver
others.
others.
Off for
Off for
for all
for all
Sink
open
pins.
pins.
Off
On
Off
Off
On
On
Off
Off
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