- 您现在的位置：买卖IC网 > PDF目录79850 > LSM-0.8/10-D12-C (MURATA POWER SOLUTIONS INC) 1-OUTPUT DC-DC REG PWR SUPPLY MODULE PDF资料下载
参数资料
| 型号： | LSM-0.8/10-D12-C |
| 厂商： | MURATA POWER SOLUTIONS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, SMT-6 |
| 文件页数： | 18/18页 |
| 文件大小： | 1583K |
| 代理商： | LSM-0.8/10-D12-C |
MDC_LSM 10A D12 Models.B01 Page 9 of 18
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
Single Output
LSM-10A D12 Models
Non-Isolated, 12Vin, 0.75-5Vout DC/DC Converters
If you measure the input voltage before start up with a Digital Voltmeter
(DVM), the voltage may appear to be adequate. Limited external capacitance
and/or too high a source impedance may cause a short downward spike at
power up, causing an instantaneous voltage drop. Use an oscilloscope not a
DVM to observe this spike. The converter’s soft-start controller is sensitive to
input voltage. What matters here is the actual voltage at the input terminals at
all times.
Symptoms of start-up difficulties may include failed started, output oscilla-
tion or brief start up then overcurrent shutdown. Since the input voltage is never
absolutely constant, the converter may start up some times and not others.
Solutions
To improve start up, review the conditions above. One of the better solutions is
to place a moderate size capacitor very close to the input terminals. You may
need two parallel capacitors. A larger electrolytic or tantalum cap supplies the
surge current and a smaller parallel low-ESR ceramic cap gives low AC imped-
ance. Too large an electrolytic capacitor may have higher internal impedance
(ESR) and/or lower the start up slew rate enough to upset the DC/DC’s control-
ler. Make sure the capacitors can tolerate reflected switching current pulses
from the converter.
The capacitors will not help if the input source has poor regulation. A
converter which starts successfully at 3.3 Volts will turn off if the input voltage
decays to below the input voltage theshold, regardless of external capacitance.
Increase the input start up voltage if possible to raise the downward voltage
spike. Also, make sure that the input voltage ramps up in a reasonably short
time (less than a few milliseconds). If possible, move the input source closer to
the converter to reduce ohmic losses in the input wiring. Remember that the
input current is carried both by the wiring and the ground plane return. Make
sure the ground plane uses adequate thickness copper. Run additional bus wire
if necessary.
Any added output capacitor should use just enough capacitance (and no
more) to reduce output noise at the load and to avoid marginal threshold noise
problems with external logic. An output cap will also “decouple” inductive reac-
tance in the load. Certain kinds of electronic loads include “constant current”
characteristics which destabilize the output with insufficient capacitance. If the
wiring to the eventual load is long, consider placing this decoupling cap at the
load. Use the Remote Sense input to avoid ohmic voltage drop errors.
An elegant solution to start up problems is to apply the input voltage with
the Remote On/Off control first in the off setting (for those converters with an
On/Off Control). After the specified start-up delay (usually under 20 mSec), turn
on the converter. The controller will have already been stabilized. The short
delay will not be noticed in most applications. Be aware of applications which
need “power management” (phased start up).
Finally, it is challenging to model some application circuits with absolute
fidelity. How low is the resistance of your ground plane? What is the inductance
(and distributed capacitance) of external wiring? Even a detailed mathematical
model may not get all aspects of your circuit. Therefore it is difficult to give cap
values which serve all applications. Some experimentation may be required.
Typical Performance Curves for LSM D12 SMT Series
相关PDF资料 |
PDF描述 |
|---|---|
| LV56081GP | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC24 |
| LT3757MPMSE#PBF | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| LM4040ESD-250GT3 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO5 |
| LM4040DSD-330GT3 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 3.3 V, PDSO5 |
| LM4040BIZ-5.0 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PBCY3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LSM-1 | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:Single Output, Non-Isolated, 3.3VIN, 0.8-2.5VOUT 10 Amp DC/DC’s in SMT Packages |
| LSM-1.2 | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:Single Output, Non-Isolated, 3.3VIN, 0.8-2.5VOUT 10 Amp DC/DC’s in SMT Packages |
| LSM-1.2/10-D12 | 制造商:Murata Power Solutions 功能描述:DC/DC SM 10A 10-14V IN,1.2V OUT, NON-ISO - Tape and Reel 制造商:Murata Power Solutions 功能描述:Module DC-DC 1-OUT 1.2V 10A 6-Pin SMT |
| LSM-1.2/10-D12-C | 功能描述:DC/DC转换器 12W 12V to 1.2V 10A RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| LSM-1.2/10-D12EB | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:10 Amp DC/DC Power Converter Evaluation Boards |
发布紧急采购，3分钟左右您将得到回复。