a8504 Allegro MicroSystems, Inc., a8504 Datasheet - Page 14

• Manufacturer Part Number: a8504
• Description: Wled/rgb Backlight Driver For Medium Size Lcds
• Manufacturer: Allegro MicroSystems, Inc.

A8504
C
0.1 μF
C
RFSET
RISET
V
5 V ±10%
IN
Figure 11. Typical application circuit for PWM dimming, using digital PWM (on the PWM
pin). Showing configuration of 16 WLEDs at 160 mA, in two strings of 8 LEDs each.
C
COMP
FSET
AGND
GND
ISET
LED8 LED7 LED6 LED5 LGND
PWM
SKIP
IN
VIN
Figure 12. Typical application circuit for LED modules with ESD capacitors.
C
V
24 V
C
BAT
RISET
WLED/RGB Backlight Driver for Medium Size LCDs
10 μH
C
L1
BAT
A8504
RFSET
V
5 V ±10%
SW
IN
LED4 LED3 LED2
SW
SKIP
COMP
FSET
ISET
LED8
LED7 LED6 LED5 LGND
ROVP
PWM
C
D1
IN
OVP
PGND
SEL3
SEL2
SEL1
LED1
VIN
COUT
2.2 μF
V
BAT
V
V
OUT
24 V
A8504
IN
C
BAT
SW SW
LED4 LED3 LED2
ROVP
All ESD capacitors across LED arrays are 0.1 μF
OVP
AGND
PGND
SEL3
SEL2
SEL1
LED1
GND
COUT
V
V
OUT
IN
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
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