参数资料
型号: A8514KLPTR-T
厂商: Allegro Microsystems Inc
文件页数: 33/42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:
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
A8514
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
f SW
= = 0.92 μ F
I CSW rms = I IN (max)
= 0.848 (A)
= 0.47 A
Step 9 Selecting coupling capacitor C SW .The minimum capaci-
tance of C SW is related to the maximum voltage ripple allowed
across it:
I OUT D MAX
C SW = (53)
? V SW
0.24 (A) 0.765
0.1 (V) 2 (MHz)
The rms current requirement of the coupling capacitor is given
by:
1 – D (max) (54)
D (max)
1 – 0.765
0.765
The voltage rating of the coupling capacitor must be greater than
V IN (max), or 16 V in this case. A ceramic capacitor rated for
2.2 μ F 25 V will suffice for this application.
L2
10 μ H
V IN
9 to 16 V
R SC
0.033 Ω
Q1
L1
10 μ H
C SW
2.2 μF
D1
2 A / 60 V
V OUT
C IN
2.2 μ F
R ADJ
249 Ω
R C
20 Ω
C C
22 nF
GATE
VSENSE
SW
R OVP
39.2 k Ω
C OUT
4.7 μ F
A8514
OVP
LED4
COMP
100 k Ω
V C
R ISET
11 k Ω
C VDD
0.1 μ F
R FSET
10 k Ω
VIN
VDD
PAD LED1
PWM/EN LED3
APWM
ISET
FSET/SYNC
AGND PGND
FAULT LED2
C P
120 pF
R Z 150 Ω
C Z 0.47 μ F
Figure 35. Typical application showing SEPIC configuration, with accurate input current sense, and VSENSE
to ground protection.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
33
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