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参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 6/42页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT 4X80MA 16-ETSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，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： | 白色 LED |
| 频率： | 580kHz ~ 2MHz |
| 电源电压： | 5 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
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A8514
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
ELECTRICAL CHARACTERISTICS 1,2 (continued) Valid at V IN = 16 V, T A = 25°C, indicates specifications guaranteed by design
and characterization over the full operating temperature range with T A = T J = –40°C to 125°C; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Oscillator Frequency
R FSET = 10 k Ω
1.8
2
2.2
MHz
Oscillator Frequency
FSET/SYNC Pin Voltage
FSET Frequency Range
f SW
V FSET
f FSET
R FSET = 20 k Ω
R FSET = 35.6 k Ω
R FSET = 10 k Ω
0.9
520
?
580
1
580
1.00
?
1.1
640
?
2500
MHz
kHz
V
kHz
Synchronization
Synchronized PWM Frequency
Synchronization Input
Minimum Off-Time
Synchronization Input
Minimum On-Time
f SWSYNC
t PWSYNCOFF
t PWSYNCON
580
150
150
?
?
?
2300
?
?
kHz
ns
ns
SYNC Input Logic Voltage
V SYNC(H)
V SYNC(L)
FSET/SYNC pin, high level
FSET/SYNC pin, low level
?
2.0
?
?
0.4
?
V
V
LED Current Sinks
LEDx Accuracy
LEDx Matching
LEDx Regulation Voltage
I SET to I LEDx Current Gain
ISET Pin Voltage
Allowable ISET Current
V LED Short Detect
Soft Start LEDx Current
Err LED
Δ LEDx
V LED
A ISET
V ISET
I SET
V LEDSC
I LEDSS
I SET = 120 μ A
I SET = 120 μ A
V LED1 =V LED2 =V LED3 =V LED4 , I SET = 120 μ A
I SET = 120 μ A
While LED sinks are in regulation, sensed
from LEDx pin to ground
Current through each enabled LEDx pin
during soft start
?
?
600
633
0.988
20
4.6
?
?
?
700
653
1.003
?
5.1
2.0
3
3
800
672
1.018
120
5.6
–
%
%
mV
A/A
V
μ A
V
mA
Measured while PWM/EN = low, during
Maximum PWM Dimming
Until Off-Time 2
Minimum PWM On-Time
PWM High to LED-On Delay
PWM Low to LED-Off Delay
t PWML
t PWMH
t dPWM(on)
t dPWM(off)
dimming control and internal references
are powered-on (exceeding t PWML results in
shutdown)
First cycle when powering-up device
Time between PWM enable and LED current
reaching 90% of maximum
Time between PWM enable going low and
LED current reaching 10% of maximum
?
?
?
?
32,750
0.75
0.5
360
?
2
1
500
f SW
cycles
μ s
μ s
ns
Continued on the next page…
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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