A8507 View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'A8507' 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
P
P
10
7
6
8
DRIVER SENP SENN OVP
11 VIN
VOUT
C4
12 LEDs per string
R1 C5
23 FAULT
24 EN
A8507
(LP package)
LED1 16
17
LED2
2 PWM
R2
R3
COMP
RFSET 15
RISET14 FSET
12 ISET
Rz1
NC
3
18
LED3
20
LED4
21
LED5
Cz1
NC
5
9 NC
PAD
22
LED6
GND GND
LGND PGND
1 13
19
4
P
R2, R3 optional (A8507 has
internal pull-down resistors)
100
95
90
85
80
0
VBAT (V)
12
21
20
40
60
80
100
PWM duty cycle (%)
RISET = 10.0 kΩ, RFSET = 51 kΩ,
ROVP = 36 kΩ, Q1=FQB17N08L
Figure 17. Typical Application with 3 parallel strings, 12 series LEDs each, 160 mA per channel
VBAT
8 to 21 V
C1
P
VBIAS
4.5 to 5.5 V
L1
D1
Q1
C2
RSC
C3
ROVP
P
10
7
6
8
P
DRIVER SENP SENN OVP
11 VIN
12 LEDs per string
VOUT
C4
R1 C5
23 FAULT
24 EN
A8507
(LP package)
16
LED1
17
LED2
2 PWM
R2
R3
COMP
RFSET 15
RISET14 FSET
12 ISET
Rz1
3 NC
18
LED3
20
LED4
21
LED5
Cz1
NC
5
9 NC
PAD
22
LED6
GND GND
LGND PGND
1 13
19
4
P
R2, R3 optional (A8507 has
internal pull-down resistors)
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
Figure 18. Typical Application with 4 parallel strings, 12 series LEDs each, 80 mA per channel
VBAT (V)
12
21
100
Allegro MicroSystems, Inc.
13
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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