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A8504 View Datasheet(PDF) - Allegro MicroSystems

Part Name
Description
MFG CO.
'A8504' PDF : 18 Pages View PDF
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A8504
WLED/RGB Backlight Driver for Medium Size LCDs
Pin-out Diagram
PGND 1
SKIP 2
COMP 3
FSET 4
ISET 5
GND 6
LED1 7
21 PGND
20 PWM
19 GND
EP
18 SEL3
17 SEL2
16 SEL1
15 LED2
(Top View)
Terminal List Table
Number Name
Description
1
PGND Power ground pin.
2
SKIP
Reduces boost switching frequency in case of light load to improve frequency. Normally, this pin should be low; when
high, fSW is divided by 4.
3
COMP Compensation pin; connect external compensation network for boost converter.
4
FSET Sets boost switching frequency. Connect RFSET from FSET to GND to set frequency. Range for RFSET is 13 to 40 kΩ.
5
ISET Sets 100% current through LED string. Connect RISET from ISET to GND. Range for RISET is 8.45 to 30 kΩ.
6
GND Connect to AGND.
7
LED1
8
9
LED3
LED5
LEDx capable of 45 mA.
10
LED7
11
LGND Power ground pin for LED current sink.
12
LED8
13
LED6 LEDx capable of 45 mA.
14
LED4
15
LED2
16
SEL1
17
SEL2 SEL1, SEL2, and SEL3 decide active LED strings.
18
SEL3
19
GND Connect to AGND.
20
PWM
On/off and on/off LED current control with external PWM. Apply logic level PWM for PWM controlled dimming mode.
When unused, connect to AGND.
21
PGND Power ground pin.
22
OVP
Connect to this pin to output capacitor +Ve node through a resistor to enable OVP (overvoltage protection). Default OVP
level with 0 Ω resistor is 30 V, and it can be programmed up to 47 V.
23
SW
24
SW DMOS drain node.
25
VIN Input supply for the IC. Decouple with a 0.1 μF ceramic capacitor.
26
AGND Circuit ground pin.
EP Exposed pad. Electrically connected to PGND and LGND; connect to PCB copper plane for heat transfer.
Allegro MicroSystems, Inc.
17
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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