A8513 ALLEGRO [Allegro MicroSystems], A8513 Datasheet - Page 14

• Manufacturer Part Number: A8513
• Description: Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver
• Manufacturer: ALLEGRO [Allegro MicroSystems]

A8513
Input UVLO
When V
can be enabled by asserting EN/PWM. The A8513 is disabled
when V
(figure 17). This 1 μs lag prevents false shut downs during
momentary glitches on the input power supply.
VDD
The VDD pin provides regulated bias supply for internal circuits.
Connect a capacitor, C
this pin.
IN
IN
falls below V
rises above the UVLO threshold V
VDD
UVLOfall
, with a value of 0.01 to 0.1 μF to
– V
C1
C2
C3
C4
Figure 17. Input UVLO. (A) UVLO tripped (V
set (ch2, 2 V/ div.). Shows LED current (ch3, 100 mA/div.) and EN/PWM
(ch4, 1 V/div.), time = 5 ms/div.
UVLOhys
EN/PWM
FAULT
V
I
LED
IN
for more than 1 μs
UVLOrise
Wide Input Voltage Range, High Efficiency
, the A8513
t
Shutdown
If the EN/PWM pin is pulled low for more than t
device enters shutdown mode and clears all internal fault regis-
ters. In shutdown, the A8513 will disable all current sources and
wait until EN/PWM goes high to re-enable the IC.
B
B
A
A
IN
, ch1, 2 V/div.), (B) fault flag
Fault Tolerant LED Driver
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
PWML
, the
14