A8516 Ver la hoja de datos (PDF) - Allegro MicroSystems
Número de pieza
componentes Descripción
Fabricante
A8516 Datasheet PDF : 17 Pages
| |||
A8516
LED Backlight Driver for LCD Monitors and Televisions
Normal Operation and Fault Conditions
VBAT = 12 V, Load = 6 strings, 18 LEDs each string, 56 mA per string, Output capacitors = 2 × 2.2 μF ceramic, ROVP = 249 kΩ (OVP at 69 V)
C4
C2,C3
C1
VOUT
ILED
VLEDx
VEN
t
OVP tripped
C4
C2,C3
C1
VOUT
ILED
VLEDx
VEN
VOUT
ILED
t
OVP tripped
C4
C2,C3
C1
VLEDx
VEN
t
C4
C2,C3
C1
VOUT
ILED
VLEDx
VFAULT
LED short-
detect tripped
t
Symbol
C1
C2
C3
C4
t
Parameter Units/Division
VEN
VLEDx
VOUT
Total ILED
time
10 V
10 V
10 V
100 mA
2 ms
Normal startup with VBAT = 12 V,
(VOUT ≈ 58 V when cold)
Symbol
C1
C2
C3
C4
t
Parameter Units/Division
VEN
VLEDx
VOUT
Total ILED
time
10 V
10 V
10 V
100 mA
2 ms
Startup with one LED string open;
(OVP tripped at ≈ 69 V. Open string
removed from regulation. Remaining
strings operate normally.)
Symbol
C1
C2
C3
C4
t
Parameter Units/Division
VEN
VLEDx
VOUT
Total ILED
time
10 V
10 V
10 V
100 mA
2 ms
Startup with all LED strings connected,
then one LED string becomes open;
(OVP tripped at ≈ 69 V. Open string
removed from regulation. Remaining
strings operate normally)
Symbol
C1
C2
C3
C4
t
Parameter Units/Division
VFAULT
VLEDx
VOUT
Total ILED
time
10 V
10 V
10 V
100 mA
2 ms
OVP setpoint too high for the application.
Startup with one string open; voltage
at LEDx pin exceeded Short-Detect
threshold (25 V) before OVP could be
tripped. IC shuts down.
Allegro MicroSystems, Inc.
10
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Share Link: 