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| 型号： | XRP7604EDB-F |
| 厂商： | Exar Corporation |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC CONV PWM STP-DWN BUCK 8SOIC |
| 标准包装： | 46 |
| 恒定电流： | 是 |
| 拓扑： | 高端，PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 类型 - 次要： | 白色 LED |
| 频率： | 960kHz ~ 1.55MHz |
| 电源电压： | 4.5 V ~ 29 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 其它名称： | 1016-1339-5 |
X R P 7 6 0 4
1 A 2 9 V N o n - S y n c . B u c k H i g h P o w e r L E D D r i v e r
DESIGN EXAMPLE
Schottky current rating I F
Design a drive circuit for a string of 5 LED at
0.75A with a 24V input voltage. Nominal LED
voltage is 3.3V.
I F ≥ 1 ?
( 5 × 3 . 3 ) × 0 . 75 A = 0 . 42 A
24 V
Resistor RFB calculation
Voltage rating should be 30V. B340A rated at
30V/3A or equivalent can be used for its
RFB =
0 . 2 V
0 . 75 A
= 0 . 27 Ω
ample current rating and low forward voltage.
Rs calculation
A standard value of 0.27ohm 0805 is selected.
Inductor L1 calculation
Rs =
0. 3 V ? (1 .5 × 1 .15 × 1 .5 × 0. 75 A × 0. 095 Ω )
33 μ A
= 3 . 5 k Ω
( 5 × 3 . 3 V ) × ( 24 V ? ( 5 × 3 . 3 V ) ) = 19 . 1 μ H
L 1 =
24 V × 1 . 2 MHz × ( 0 . 3 × 0 . 75 A )
Use standard resistor value for Rs of 3.4k ? .
Use a 22uH standard inductor.
Input capacitor
A 4.7μF C IN (C1) is needed (refer to table 1).
From Equ.4, the ripple current rating of C IN is
a fraction of 0.75A. A 4.7uF/25V ceramic
capacitor easily meets this requirement and
offers low ESR and ESL.
LAYOUT CONSIDERATION
i) Place the bypass capacitors C4 and C5 as
close as possible to the XRP7604 IC. See
figure 5 for details.
ii) Create a pad under the IC that connects the
power pad (pin 9) to the inductor. Duplicate
this pad through the pcb layers if present, and
on the bottom side of the PCB. Use multiple
vias to connect these layers to aid in heat
dissipation. Do not oversize this pad - since
the LX node is subjected to very high dv/dt
voltages, the stray capacitance formed
between these islands and the surrounding
circuitry will tend to couple switching noise
iii) Connect the Schottky diode cathode as
close as possible to the LX node and inductor
input side. Connect the anode to a large
diameter trace or a copper area that connects
the input ground to the output ground.
iv) The output capacitor, if used, should be
placed close to the load. Use short wide
Fig. 17: Circuit for design example
copper regions to connect output capacitors to
load to minimize inductance and resistances.
v) Keep other sensitive circuits and traces
away from the LX node in particular and away
from the power supply completely if possible.
For more detail on the XRP7604 layout see the
XRP7604EVB Evaluation Board Manual
available on our web site. Each layer is shown
in detail as well as a complete bill of materials.
Fig. 18: XRP7604 Eval Board
Component Side Lay
? 2009 Exar Corporation
11/13
Rev. 1.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRP7604EDB-F/TR | 功能描述:电压模式 PWM 控制器 1A 29V Non-Sync Buck High Power RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| XRP7604EDBTR-F | 功能描述:LED照明驱动器 Power LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| XRP7604EVB | 功能描述:电源管理IC开发工具 Eval Board for XRP7604 Series RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| XRP7613EVB | 功能描述:LED 照明开发工具 XRP7613 Eval Brd RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| XRP7613IDBTR-F | 功能描述:LED照明驱动器 1.2A 36V SD High Brightness LED Drvr RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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