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参数资料
| 型号： | A8511KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 150MA AUTO 28-TSSOP |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 高亮度 LED（HBLED），RGB，白色 LED |
| 频率： | 600kHz ~ 2.1MHz |
| 电源电压： | 8 V ~ 21 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1367-6 |
A8511
2 MHz, 4 Channel×150 mA WLED/RGB Driver
With Output Disconnect
Pin-out Diagram
BIAS 1
DGND 2
DIM 3
SW 4
SW 5
28 EN
27 SEL2
26 SEL1
25 PGND
24 PGND
Terminal List Table
SW 6
OVP 7
CAP 8
AGND 9
ISET 10
VTI 11
VTO 12
LED1 13
LED2 14
PAD
23 PGND
22 NC
21 VIN
20 COMP
19 FSET
18 OUT
17 LED4
16 LED3
15 LGND
Number
1
2
3
4, 5, 6
7
8
9
10
11
12
13,14,16,17
15
18
19
Name
BIAS
DGND
DIM
SW
OVP
CAP
AGND
ISET
VTI
VTO
LEDX
LGND
OUT
FSET
Function
Output of internal 6 V bias supply. Decouple with a 0.1 μ F ceramic capacitor to DGND.
Digital signal ground. Connect AGND, DGND, LGND, PGND, and PAD using star ground connection.
Sets I LED by adjusting the I SET to I LEDx current gain, A ISET . When DIM = V IL , A ISET = 960 and when DIM=V IH , A ISET = 240.
DMOS switch drain node. Tie these three pins together on the PCB.
To enable overvoltage protection, connect this pin through a resistor to the CAP pin. The default OVP level, with 0 Ω resistor,
is 19.5 V. External resistor can set OVP up to 38 V.
Input connection for output disconnect switch.
Analog signal ground. Connect AGND, DGND, LGND, PGND, and PAD using star ground connection.
Sets the 100% current level through LED strings. Set by value of RISET connected between ISET and AGND.
ISET voltage override. Sets the ISET voltage when V TI < 1.23 V. Tie directly to VTO pin to disable this feature. This pin can
be used for LED current thermal derating or external analog LED current control. See the Typical Application Circuits section
for additional information.
2.46 V output voltage. Use this voltage to bias an external NTC resistor or as a DAC reference. This pin can be used as a
logic high signal for the SEL and DIM pins.
LED current sinks.
Power ground for LED current sinks. Connect AGND, DGND, LGND, PGND, and PAD using star ground connection.
Output connection for output disconnect switch. Connect LED common connection to this pin.
Connect RFSET between FSET and AGND to set boost switching frequency.
20
COMP Sets boost loop compensation. Connect external compensation capacitor between COMP and AGND for boost converter stability.
21
22
23, 24, 25
26
27
28
–
VIN
NC
PGND
SEL1
SEL2
EN
PAD
Input supply for the device. Decouple with a 0.1 μ F ceramic capacitor.
Not connected internally. It is recommended to connect this pin to external ground.
Power ground. Connect AGND, DGND, LGND, PGND, and PAD using star ground connection.
SEL1 and SEL2 together select which LED strings are enabled. See Functional Description section.
Enable and PWM LED current control. Apply logic-level PWM for PWM-controlled dimming mode.
Exposed thermal pad. Connect AGND, DGND, LGND, PGND, and PAD using star ground connection. Connect to PCB
copper layer for enhanced heat dissipation.
8511-DS
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
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