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参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 29/42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
V OUT I OUT
? I = I INDC (max) =
( ? I ? T ) 10 6
C IN =
= 59.4 μ F
Selecting the electrolytic input capacitor according to dimming
transient
During a PWM dimming transient, unless an adequate input
capacitor is used, the input voltage drops significantly.
The input capacitor ripple current, Δ I , during the dimming tran-
sient is the same as the input maximum DC current, and can be
calculated by:
(28)
V IN (min) η
where V IN (min) is the minimum input voltage, 10 V.
Consider the case where: η = 0.88, V IN (min) = 10 V,
V OUT = 33.1 V, I OUT = 0.24 A, then:
Δ I = I INDC (max)
= (33.1 × 0.24) / (10 × 0.88) = 0.9 A
Allowing V IN to drop by Δ V IN = 0.5 V, and considering the feed-
back loop bandwidth, or cross over frequency, to be f C = 30 kHz,
the input drop will last Δ T, calculated by :
Δ T = 1 / f C = 33 × 10 –6 (second) (29)
The required electrolytic capacitor will be:
(30)
? V IN
If this issue is important to the customer, it is recommended to
use a 50 V/ 68 μ F, low ESR value electrolytic capacitor.
Step 9 Choosing the input disconnect switch components. Set
the input disconnect 1X current limit to 3 A by choosing a sense
resistor. The calculated maximum value of the sense resistor is:
R SC (max) = V SENSEtrip / 3.0 (A) (31)
= 0.104 (V) / 3.0 (A) = 0.035 Ω
The R SC chosen is 0.033 Ω , a standard.
The trip point voltage must be:
V ADJ = 3.0 (A) × 0.033 ( Ω ) = 0.099 (V)
R ADJ = ( V SENSEtrip – V ADJ ) / I ADJ (typ) (32)
R ADJ = (0.104 (V) – 0.099 (V)) / 20.3 ( μ A) = 246.31 Ω
A value of 249 Ω was chosen for this design.
Step 10 See appendix A for a detailed description of how to
calculate R Z , C Z , and C P . Using L 1 = 10 μ H, C OUT = (4.7 μ F +
2.2 μ F ), and f C = 30 kHz, the calculation results for R Z , C Z , and
C P are: R Z = 499 Ω , C Z = 100 nF, and C P = 320 pF.
V IN
10 to 14 V
R SC
0.033 Ω
Q1
L1
10 μ H
D1
2 A / 60 V
V OUT
C IN
4.7 μ F
R ADJ
249 Ω
R C
20 Ω
C C
22 nF
GATE
VSENSE
SW
OVP
R OVP
137 k Ω
C OUT1
4.7 μ F
C OUT2
2.2 μ F
100 k Ω
V C
C VDD
0.1 μ F
VIN
VDD
A8514
PAD
LED1
R ISET
11 k Ω
R FSET
10 k Ω
FAULT
PWM/EN
APWM
ISET
FSET/SYNC
AGND
LED2
LED3
LED4
COMP
PGND
C P
320 pF
R Z
499 Ω
C Z
10 LEDs each string
100 nF
Figure 34. The schematic diagram showing calculated values from the design example above.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
29
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