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参数资料
| 型号： | LSN-3.3/16-W3H |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 4/8页 |
| 文件大小： | 504K |
| 代理商： | LSN-3.3/16-W3H |
LSN-16A W3 Series
N O N - I S O L A T E D , W I D E I N P U T D C / D C C O N V E R T E R S
4
Input Fusing
Most applications and or safety agencies require the installation of fuses at
the inputs of power conversion components. The LSN W3 Series are not
internally fused. Therefore, if input fusing is mandatory, either a normal-blow
or a fast-blow fuse with a value no greater than twice the maximum input cur-
rent should be installed within the ungrounded input path to the converter.
As a rule of thumb however, we recommend to use a normal-blow or slow-
blow fuse with a typical value of about twice the maximum input current,
calculated at low line with the converter's minimum efciency.
Safety Considerations
LSN W3 SMT's are non-isolated DC/DC converters. In general, all DC/DC's
must be installed, including considerations for I/O voltages and spacing/sepa-
ration requirements, in compliance with relevant safety-agency speci-
cations (usually UL/IEC/EN60950).
In particular, for a non-isolated converter's output voltage to meet SELV
(safety extra low voltage) requirements, its input must be SELV compliant.
If the output needs to be ELV (extra low voltage), the input must be ELV.
Input Overvoltage and Reverse-Polarity Protection
LSN W3 SMT Series DC/DC's do not incorporate either input overvoltage
or input reverse-polarity protection. Input voltages in excess of the specied
absolute maximum ratings and input polarity reversals of longer than "instan-
taneous" duration can cause permanent damage to these devices.
Start-Up Time
The VIN to VOUT Start-Up Time is the interval between the time at which a
ramping input voltage crosses the lower limit of the specied input voltage
range and the fully loaded output voltage enters and remains within its
specied accuracy band. Actual measured times will vary with input source
impedance, external input capacitance, and the slew rate and nal value of
the input voltage as it appears to the converter.
The On/Off to VOUT Start-Up Time assumes the converter is turned off via
the On/Off Control with the nominal input voltage already applied to the
converter. The specication denes the interval between the time at which the
converter is turned on and the fully loaded output voltage enters and remains
within its specied accuracy band. See Typical Performance Curves.
Figure 3. Measuring Output Ripple/Noise (PARD)
Output ripple/noise (also referred to as periodic and random deviations
or PARD) may be reduced below specied limits with the installation of
additional external output capacitors. Output capacitors function as true lter
elements and should be selected for bulk capacitance, low ESR, and appro-
priate frequency response. Any scope measurements of PARD should be
made directly at the DC/DC output pins with scope probe ground less than
0.5" in length.
C1
C1 = NA
C2 = 22F TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
C2
RLOAD
6
4
COPPER STRIP
3
COPPER STRIP
SCOPE
+OUTPUT
COMMON
+SENSE
All external capacitors should have appropriate voltage ratings and be located
as close to the converters as possible. Temperature variations for all relevant
parameters should be taken into consideration.
You should add only enough output capacitance to attenuate the noise to
your desired level. Large amounts of output capacitance cause poor dynamic
response (step load changes, etc.). Too great an output capacitor can make
the converter oscillate (actually increasing the noise!) while substantial
capacitance which is less than the oscillation threshold can still cause ringing
and overshoot. Finally, you must use less output capacitance if the cap is a
low ESR type (OSCON, etc.).
The most effective combination of external I/O capacitors will be a function of
your line voltage and source impedance, as well as your particular load and
layout conditions. Our Applications Engineers can recommend potential solu-
tions and discuss the possibility of our modifying a given device’s internal lter-
ing to meet your specic requirements. Contact our Applications Engineering
Group for additional details.
Remote Sense
LSN W3 SMT Series DC/DC converters offer an output sense function on pin
3. The sense function enables point-of-use regulation for overcoming moder-
ate IR drops in conductors and/or cabling. Since these are non-isolated
devices whose inputs and outputs usually share the same ground plane,
sense is provided only for the +Output.
The remote sense line is part of the feedback control loop regulating the
DC/DC converter’s output. The sense line carries very little current and
consequently requires a minimal cross-sectional-area conductor. As such,
it is not a low-impedance point and must be treated with care in layout and
cabling. Sense lines should be run adjacent to signals (preferably ground),
and in cable and/or discrete-wiring applications, twisted-pair or similar
techniques should be used. To prevent high frequency voltage differences
between VOUT and Sense, we recommend installation of a 1000pF capacitor
close to the converter.
Figure 2. Measuring Input Ripple Current
相关PDF资料 |
PDF描述 |
|---|---|
| LSN-T/16-W3 | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LSN-1.5/16-W3 | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LSN-3.3/16-W3 | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LSN-1.5/16-W3J | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LSN-2.5/16-W3H | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LSN3K | 功能描述:限位开关 HDLS Non Plug-in Side Rotary RoHS:否 制造商:Honeywell 触点形式:SPDT 执行器:Non-Contact 电流额定值:30 mA 电压额定值 AC: 电压额定值 DC:3.6 V 工作力:10 g IP 等级:IP 67 NEMA 额定值:1, 4, 12, 13 端接类型:4-Pin M12 Connector 安装:SMD/SMT |
| LSN3K3D | 功能描述:限位开关 LIMIT SWITCH RoHS:否 制造商:Honeywell 触点形式:SPDT 执行器:Non-Contact 电流额定值:30 mA 电压额定值 AC: 电压额定值 DC:3.6 V 工作力:10 g IP 等级:IP 67 NEMA 额定值:1, 4, 12, 13 端接类型:4-Pin M12 Connector 安装:SMD/SMT |
| LSN3N | 功能描述:限位开关 Limit Switch Single Pole Plug-in RoHS:否 制造商:Honeywell 触点形式:SPDT 执行器:Non-Contact 电流额定值:30 mA 电压额定值 AC: 电压额定值 DC:3.6 V 工作力:10 g IP 等级:IP 67 NEMA 额定值:1, 4, 12, 13 端接类型:4-Pin M12 Connector 安装:SMD/SMT |
| LSN4L | 功能描述:限位开关 LIMIT SWITCH RoHS:否 制造商:Honeywell 触点形式:SPDT 执行器:Non-Contact 电流额定值:30 mA 电压额定值 AC: 电压额定值 DC:3.6 V 工作力:10 g IP 等级:IP 67 NEMA 额定值:1, 4, 12, 13 端接类型:4-Pin M12 Connector 安装:SMD/SMT |
| LSN4L-2D | 功能描述:限位开关 LIMIT SWITCH RoHS:否 制造商:Honeywell 触点形式:SPDT 执行器:Non-Contact 电流额定值:30 mA 电压额定值 AC: 电压额定值 DC:3.6 V 工作力:10 g IP 等级:IP 67 NEMA 额定值:1, 4, 12, 13 端接类型:4-Pin M12 Connector 安装:SMD/SMT |
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