- 您现在的位置：买卖IC网 > PDF目录17412 > ADP1850DP-EVALZ (Analog Devices Inc)EVAL BOARD FOR ADP1850DP PDF资料下载
参数资料
| 型号： | ADP1850DP-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ADP1850DP |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.09V |
| 电流 - 输出： | 50A |
| 输入电压： | 10 ~ 15 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP1850DP |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
ADP1850
INPUT CAPACITOR SELECTION
The input current to a buck converter is a pulse waveform. It is
zero when the high-side switch is off and approximately equal
to the load current when it is on. The input capacitor carries the
input ripple current, allowing the input power source to supply
only the direct current. The input capacitor needs sufficient
ripple current rating to handle the input ripple, as well as an
ESR that is low enough to mitigate input voltage ripple. For the
usual current ranges for these converters, it is good practice to
use two parallel capacitors placed close to the drains of the
high-side switch MOSFETs (one bulk capacitor of sufficiently
high current rating and a 10 μF ceramic decoupling capacitor,
typically).
Select an input bulk capacitor based on its ripple current rating.
Data Sheet
INPUT FILTER
Normally a 0.1 μF or greater value bypass capacitor from the
input pin (VIN) to AGND is sufficient for filtering out any
unwanted switching noise. However, depending on the PCB
layout, some switching noise can enter the ADP1850 internal
circuitry; therefore, it is recommended to have a low pass filter
at the VIN pin. Connecting a resistor, between 2 Ω and 5 Ω, in
series with VIN and a 1 μF ceramic capacitor between VIN and
AGND creates a low pass filter that effectively filters out any
unwanted glitches caused by the switching regulator. Keep in
mind that the input current could be larger than 100 mA when
driving large MOSFETs. A 100 mA across a 5 Ω resistor creates
a 0.5 V drop, which is the same voltage drop in VCCO. In this
case, a lower resistor value is desirable.
D =
First, determine the duty cycle of the output.
V OUT
V IN
V IN
2 ? TO 5 ?
1μF
ADP1850
VIN
AGND
I O × D ( 1 ? D )
( V PP ? I O × DR ESR ) f SW
C IN , MIN = I O ×
V IN ? V OUT V
The input capacitor RMS ripple current is given by
I RMS = I O D ( 1 ? D )
where:
I O is the output current.
D is the duty cycle
The minimum input capacitance required for a particular load is
C IN , MIN =
where:
V PP is the desired input ripple voltage.
R ESR is the equivalent series resistance of the capacitor.
If an MLCC capacitor is used, the ESR is near 0, then the
equation is simplified to
D ( 1 ? D )
V PP × f SW
The capacitance of MLCC is voltage dependent. The actual
capacitance of the selected capacitor must be derated according to
the manufacturer’s specification. In addition, add more bulk
capacitance, such as by using electrolytic or polymer capacitors,
as necessary for large step load transients. Make sure the
current ripple rating of the bulk capacitor exceeds the
maximum input current ripple of a particular design.
Figure 32. Input Filter Configuration
BOOST CAPACITOR SELECTION
To lower system component count and cost, the ADP1850 has
an integrated rectifier (equivalent to the boost diode) between
VCCO and BSTx. Choose a boost ceramic capacitor with a
value between 0.1 μF and 0.22 μF; this capacitor provides the
current for the high-side driver during switching.
INDUCTOR SELECTION
The output LC filter smoothes the switched voltage at SWx. For
most applications, choose an inductor value such that the
inductor ripple current is between 20% and 40% of the
maximum dc output load current. Generally, a larger inductor
current ripple generates more power loss in the inductor and
larger voltage ripples at the output. Check the inductor data
sheet to make sure that the saturation current of the inductor is
well above the peak inductor current of a particular design.
Choose the inductor value by the following equation:
L = × OUT
f SW × Δ I L V IN
where:
L is the inductor value.
f SW is the switching frequency.
V OUT is the output voltage.
V IN is the input voltage.
Δ I L is the peak-to-peak inductor ripple current.
Rev. A | Page 18 of 32
相关PDF资料 |
PDF描述 |
|---|---|
| SS2P2LHE3/84A | DIODE SCHOTTKY 2A 20V SMP |
| SS3P6LHM3/87A | DIODE SCHOTTKY 3A 60V SMP |
| ADP2114-EVALZ | BOARD EVALUATION 3.3V/1.8V |
| RCM12DCBI-S189 | CONN EDGECARD 24POS R/A .156 SLD |
| GCC28DCAD | CONN EDGECARD 56POS R/A .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1850SP-EVALZ | 功能描述:EVAL BOARD FOR ADP1850SP RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ADP1851ACPZ-R7 | 功能描述:电流型 PWM 控制器 w-range input Synch StepDown DC/DC Cntr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ADP1851-EVALZ | 功能描述:电源管理IC开发工具 Evaluation Board 1.8V 25A Output 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 |
| ADP1853 | 制造商:AD 制造商全称:Analog Devices 功能描述:Synchronous, Step-Down DC-to-DC Controller |
| ADP1853ACPZ-R7 | 功能描述:DC/DC 开关控制器 Synch StepDown DC/DC Cntr w/Volt trking RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
发布紧急采购，3分钟左右您将得到回复。