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| 型号： | A8511KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 6/24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
ELECTRICAL CHARACTERISTICS (continued) Valid using circuit shown in figure 1; V IN = 12 V, EN = SEL1 = SEL2 =5 V, R ISET = 7.87 k Ω ,
R FSET = 24.3 k Ω , VTO shorted to VTI , guaranteed over the full operating temperature range with T A =T J , typical specifications are at
T A = 25oC; unless otherwise noted
Characteristics
ISET Pin Allowable Current Range
Symbol
I ISET
Test Conditions
Min.
20
Typ.
–
Max.
166
Unit
μ A
RISET = 10 k Ω . 100% current ratio, measured
LEDx Accuracy 1
LEDx Matching 2
LED Switch Leakage Current
LEDx Short Detect Voltage Threshold
Output Disconnect Switch
On-Resistance
Err LED
? LEDx
I S(lkg)
V LEDSC
R ODS(on)
as the average of V LEDx , for LED1 through
LED4, with V LEDx = 0.85 V, T A =T J = 0 to 125°C
I ISET = 125 μ A, 100% current ratio, with
V LEDx = 0.85 V
V LEDx = 17.5 V, EN = V IL = 0 V
On any LEDx pin, forces latched shutdown
V IN = 8 V, I OUT = 400 mA, T J = 125°C
–
–
4.8
17.5
–
0.7
0.8
8.75
19
2
3
3
12.8
21
4
%
%
μ A
V
Ω
Oscillator
FSET Pin Voltage
Frequency
Minimum Switch Off-Time
Minimum Switch On-Time
V FSET
f OSC
t off(min)
t on(min)
R FSET = 24.3 k Ω
R FSET = 24.3 k Ω
R FSET = 51.1 k Ω
R FSET = 84.5 k Ω
1.14
1.8
0.850
0.5
–
–
1.235
2.1
1
0.6
60
60
1.33
2.4
1.285
0.8
110
110
V
MHz
MHz
MHz
ns
ns
Soft Start
Soft Start Boost Current Limit
Soft Start LEDx Current
I SWSS(lim)
I LEDSS
Initial soft start current for boost switch
Current through each enabled LEDx pin during
soft start, R ISET = 7.87 k Ω
0.4
4
0.6
7.5
0.75
12
A
mA
PWM Timing on EN pin
Measured while EN = low, during dimming
Maximum PWM Dimming Off-Time
Minimum PWM On-Time
t PWML
t PWMH
control, and internal references are powered on
(exceeding t PWML results in shutdown)
–
–
131,072
–
–
6
f SW cycles
μ s
Time between PWM enable and when LED
PWM High to LED On Delay
t dPWM(on)
current reaches 90% of maximum, with internal
references enabled and t PWML not exceeded
–
3
–
μ s
Time between EN going low and when LED
PWM Low to LED Off Delay
Thermal Shutdown Threshold 3
Thermal Shutdown Hysteresis 3
t dPWM(off)
T TSD
T TSD(hys)
current reaches 10% of maximum, with internal
references enabled and t PWML not exceeded
Device temperature rising
–
150
15
0.5
172
20
–
195
25
μ s
°C
°C
1 LED accuracy is defined as (I ISET × 960 – I LED (av)) / (I ISET × 960), I LED (av) measured as the average of I LED1 through I LED4 .
2 LED current matching is defined as (I LEDx – I LED (av)) / I LED (av), with I LED (av) as defined in footnote 1.
3 Guaranteed by design and characterization, functional tested in production.
8511-DS
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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