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| 型号： | LSM2-T/16-D12N-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 5/17页 |
| 文件大小： | 0K |
| 描述： | CONV DC/DC 80W 16A 12V SMD |
| 标准包装： | 1 |
| 系列： | LSM2 |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 8.3V |
| 电压 - 输入（最大）： | 13.2V |
| Voltage - Output 1： | 0.75 ~ 5 V |
| 电流 - 输出（最大）： | 16A |
| 电源（瓦） - 制造商系列： | 80W |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-DIP SMD 模块 |
| 尺寸/尺寸： | 1.30" L x 0.53" W x 0.34" H（33.0mm x 13.5mm x 8.6mm） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 效率： | 94% |
| 电源（瓦特）- 最大： | 80W |
| 其它名称： | 811-1791-6 |
LSM2 Series
Single Output, Non-Isolated
Selectable-Output POL DC/DC Converters
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 V OUT
and Sense, we recommend installation of a 1000pF capacitor close to the
converter.
The sense function is capable of compensating for voltage drops between
the +Output and +Sense pins that do not exceed 10% of V OUT .
Figure 2. Measuring Input Ripple Current
Start-Up Time
The V IN to V OUT Start-Up Time is the interval between the time at which a ramp-
ing input voltage crosses the lower limit of the speci?ed input voltage range
and the fully loaded output voltage enters and remains within its speci?ed
accuracy band. Actual measured times will vary with input source impedance,
external input capacitance, and the slew rate and ?nal value of the input volt-
age as it appears to the converter.
[V OUT (+) – Common] – [Sense(+) – Common] ? 10%V OUT
Power derating (output current limiting) is based upon maximum output cur-
rent and voltage at the converter’s output pins. Use of trim and sense functions
can cause the output voltage to increase, thereby increasing output power
beyond the LSM2's speci?ed rating. Therefore:
(V OUT at pins) x (I OUT ) ? rated output power
The internal 10.5 ?? resistor between +Sense and +Output (see Figure 1)
serves to protect the sense function by limiting the output current ?owing
through the sense line if the main output is disconnected. It also prevents
output voltage runaway if the sense connection is disconnected.
Note: If the sense function is not used for remote regulation, +Sense must
+SENSE
+OUTPUT
6
4
COPPER STRIP
be tied to +Output at the DC/DC converter pins.
Sense Input
Use the Sense input with caution. Many applications do not need the Sense
C1
C2
SCOPE
R LOAD
connection. Sense is intended to correct small output accuracy errors caused
by the resistive ohmic drop in output wiring as output current increases. This
output drop (the difference between Sense and V OUT when measured at the
COMMON
3
COPPER STRIP
converter) should not be allowed to exceed 0.5V. Consider using heavier wire if
this drop is excessive.
Sense is connected at the load and corrects for resistive errors only. Be
C1 = NA
C2 = 22μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple/Noise (PARD)
careful where it is connected. Any long, distributed wiring and/or signi?cant
inductance introduced into the Sense control loop can adversely affect overall
system stability. If in doubt, test the application, and observe the DC/DC's output
transient response during step loads. There should be no appreciable ringing or
oscillation. You may also adjust the output trim slightly to compensate for voltage
loss in any external ?lter elements. Do not exceed maximum power ratings.
The On/Off to V OUT 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 speci?cation de?nes the interval between the time at which the converter
is turned on and the fully loaded output voltage enters and remains within its
speci?ed accuracy band. See Typical Performance Curves.
Remote Sense
LSM2 Series offer an output sense function. The sense function enables
point-of-use regulation for overcoming moderate IR drops in conductors and/or
cabling. Since these are non-isolated devices whose inputs and outputs usually
On/Off Control
The On/Off Control pin may be used for remote on/off operation. LSM2 Series
DC/DC converters are designed so that they are enabled when the control pin
is left open (open collector).
Dynamic control of the on/off function is best accomplished with a me-
chanical relay or open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should be able to sink appropriate current when
activated and withstand appropriate voltage when deactivated.
share the same ground plane, sense is provided only for the +Output.
www.murata-ps.com/support
M D C_LSM2 Series.C01 Δ Page 5 of 17
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