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参数资料
| 型号： | LQN-0.8/50-D12B-C |
| 厂商： | MURATA POWER SOLUTIONS INC |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-10 |
| 文件页数： | 10/14页 |
| 文件大小： | 1755K |
| 代理商： | LQN-0.8/50-D12B-C |
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For MPS LQN series DC/DC converters, we recommend the
use of a time delay fuse, installed in the ungrounded input supply line, with a
value no greater than the following:
Model
Fuse Value
LQN-1/50-D12
12.5 Amps
LQN-1.8/50-D12
15 Amps
LQN-2.5/45-D12
25 Amps
LQN-3.3/45-D12
30 Amps
As a rule of thumb however, we recommend the use of a normal-blow or
slow-blow fuse with a typical value about twice the maximum input current,
calculated at low line with the converter's minimum efficiency.
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the convert-
ers must be installed in compliance with the requirements of the end-use
safety standard, i.e. IEC/EN/UL60950-1.
Input Reverse-Polarity Protection
If the input voltage polarity is accidentally reversed, an internal diode will
become forward biased and likely draw excessive current from the power
source. If this source is not current limited or the circuit appropiately fused, it
could cause permanent damage to the converter.
Start-Up Time
The VIN to VOUT Start-Up Time is the time interval between the point at which
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capaci-
tance, and the slew rate and final value of the input voltage as it appears at the
converter. The LQN Series implements a soft start circuit to limit the duty cycle
of its PWM controller at power up, thereby limiting the input inrush current.
The On/Off Control to VOUT start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin. The
specification defines the interval between the point at which the converter is
turned on (released) and the fully loaded output voltage enters and remains
within its specified accuracy band.
Similar to the VIN to VOUT start-up, the On/Off Control to VOUT start-up time is
also governed by the internal soft start circuitry and external load capacitance.
The difference in start up time from VIN to VOUT and from On/Off Control to VOUT
is therefore insignificant.
Input Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate properly
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage.
Once operating, devices will not turn off until the input voltage drops below the
Undervoltage Shutdown limit. Subsequent re-start will not occur until the input
is brought back up to the Start-Up Threshold. This built in hysteresis prevents
any unstable on/off situations from occurring at a single input voltage.
Input Overvoltage Shutdown
All LQN DC/DC's are equipped with input overvoltage protection. Input voltages
exceeding the input overvoltage shutdown specification listed in the Perfor-
mance/Functional Specifications will cause the device to shut down. A built-in
hysterisis for all models will not allow the converter to restart until the input
voltage is sufficiently reduced.
Input Source Impedance
The input of LQN converters must be driven from a low ac-impedance source.
The DC/DC's performance and stability can be compromised by the use of
highly inductive source impedances. The input circuit shown in Figure 2 is a
practical solution that can be used to minimize the effects of inductance in the
input traces. For optimum performance, components should be mounted close
to the DC/DC converter.
I/O Filtering, Input Ripple Current, and Output Noise
All LQN Series models are tested/specified for input reflected ripple current and
output noise using the specified external input/output components/circuits and
layout as shown in the following two figures. External input capacitors (CIN in
Figure 2) serve primarily as energy-storage elements, minimizing line voltage
variations caused by transient IR drops in conductors from backplane to the
DC/DC. Input caps should be selected for bulk capacitance (at appropriate
frequencies), low ESR, and high rms-ripple-current ratings.
Figure 2. Measuring Input Ripple Current
TECHNICAL NOTES
The switching nature of DC/DC converters requires that dc voltage sources
have low ac impedance as highly inductive source impedance can affect
system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus.
Your specific system configuration may necessitate additional considerations.
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
MDC_LQN D12 Models.B03 Page 5 of 14
LQN D12 Models
Non-Isolated, Single Output, 12Vin, 0.8-5Vout
45-50 Amp, -Brick, DC/DC Converters
相关PDF资料 |
PDF描述 |
|---|---|
| LQN-1.8/50-D12M-C | DC-DC REG PWR SUPPLY MODULE |
| LQN-2/50-D12B-C | DC-DC REG PWR SUPPLY MODULE |
| LQN-0.8/50-D12MH-C | DC-DC REG PWR SUPPLY MODULE |
| LQN-2.5/45-D12H-C | DC-DC REG PWR SUPPLY MODULE |
| LQN-1/50-D12M-C | DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LQN-1.2/50-D12B-C | 功能描述:DC/DC转换器 60W 12V to 1.2V 50A 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: |
| LQN-1.2/50-D12-C | 功能描述:DC/DC转换器 60W 12V to 1.2V 50A 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: |
| LQN-1.2/50-D12H-C | 功能描述:DC/DC转换器 60W 12V to 1.2V 50A HEAT SINK 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: |
| LQN-1.2/50-D12MB-C | 功能描述:DC/DC转换器 60W 12V to 1.2V 50A SURFACE MOUNT 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: |
| LQN-1.2/50-D12M-C | 功能描述:DC/DC转换器 60W 12V to 1.2V 50A SURFACE MOUNT 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: |
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