A8507ELB View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'A8507ELB' PDF : 16 Pages View PDF
A8507
LED Backlight Driver for LCD Monitors and Televisions
VBAT
8 to 21 V
C1
P
VBIAS
4.5 to 5.5 V
L1
D1
Q1
C2
RSC
C3
ROVP
10
P
7
6
8
P
DRIVER SENP SENN OVP
11 VIN
VOUT
C4
8 LEDs per string
R1 C5
23 FAULT
A8507
(LP package)
LED1
16
R2
R3
24 EN
2 PWM
COMP
RFSET 15
RISET14 FSET
12 ISET
LED2
17
LED3 18
LED4
20
Rz1
NC
3
LED5
21
Cz1
NC
5
9 NC
GND GND
PAD
LED6
22
LGND PGND
1 13
19
4
100
95
90
85
80
0
20
40
60
80
PWM duty cycle (%)
RISET = 10.0 kΩ, RFSET = 51 kΩ,
ROVP = 0 Ω, Q1=FQB17N08L
P
R2, R3 optional (A8507 has
internal pull-down resistors)
Figure 15. Typical Application with 6 parallel strings, 8 series LEDs each, 80 mA per channel
VBAT (V)
12
21
100
VBAT
8 to 21 V
C1
P
VBIAS
4.5 to 5.5 V
L1
D1
Q1
C2
RSC
C3
ROVP
10
P
7
6
8
P
DRIVER SENP SENN OVP
11 VIN
12 LEDs per string
VOUT
C4
R1 C5
23 FAULT
A8507
(LP package)
LED1
16
R2
R3
24 EN
2 PWM
COMP
RFSET 15
RISET14 FSET
12 ISET
LED2
17
LED3 18
LED4
20
Rz1
NC
3
LED5
21
Cz1
NC
5
9 NC
GND GND
PAD
LED6
22
LGND PGND
1 13
19
4
100
95
90
85
80
0
20
40
60
80
PWM duty cycle (%)
RISET = 10.0 kΩ, RFSET = 51 kΩ,
ROVP = 36 kΩ, Q1=FQB17N08L
P
R2, R3 optional (A8507 has
internal pull-down resistors)
Figure 16. Typical Application with 2 parallel strings, 12 series LEDs each, 240 mA per channel
VBAT (V)
12
21
100
Allegro MicroSystems, Inc.
12
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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