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参数资料
| 型号： | LSN2-T/30-D12G-C |
| 厂商： | MURATA POWER SOLUTIONS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 150 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, SIP-14 |
| 文件页数： | 4/16页 |
| 文件大小： | 452K |
| 代理商： | LSN2-T/30-D12G-C |
LSN2-T/30-D12 Series
DOSA-SIP, 30A POL DC/DC Converters
www.murata-ps.com
email: sales@murata-ps.com
25 Jun 2010
MDC_LSN2-T/30-D12 Series.B20Δ Page 12 of 16
[10] Any external capacitance added to the converter’s output may affect ramp
up/down times and ramp tracking accuracy.
Pre-Biased Startup
Newer systems with multiple power voltages have an additional problem
besides startup sequencing. Some sections have power already partially
applied (possibly because of earlier power sequencing) or have leakage power
present so that the DC/DC converter must power up into an existing voltage.
This power may either be stored in an external bypass capacitor or supplied by
an active source.
This “pre-biased” condition can also occur with some types of program-
mable logic or because of blocking diode leakage or small currents passed
through forward biased ESD diodes. Conventional DC/DCs may fail to start up
correctly if there is output voltage already present. And some external circuits
are adversely affected when the low side MOSFET in a synchronous rectier
converter sinks current at start up.
The LSN2-T/30-D12 series includes a pre-bias startup mode to prevent
these initialization problems. Essentially, the converter acts as a simple buck
converter until the output reaches its set point voltage at which time it converts
to a synchronous rectier design. This feature is variously called “monotonic”
because the voltage does not decay (from low side MOSFET shorting) or
produce a negative transient once the input power is applied and the startup
sequence begins.
Don’t Use Pre-Biasing and Sequencing Together
Normally, you would use startup sequencing on multiple DC/DCs to solve the
Pre-Bias problem. By causing all power sources to ramp up together, no one
source can dominate and force the others to fail to start. For most applications,
do not use startup sequencing in a Pre-Bias application, especially with an
external active power source.
If you have active source pre-biasing, leave the Sequence input open so
that the output will step up quickly and safely. A symptom of this condition is
repeated failed starts. You can further verify this by removing the existing load
and testing it with a separate passive resistive load which does not exceed full
current. If the resistive load starts successfully, you may be trying to drive an
external pre-biased active source.
It may also be possible to use pre-bias and sequencing together if the Pre-
Bias source is in fact only a small external bypass capacitor slowly charged by
leakage currents. Test your application to be sure.
Output Adjustments
The LSN2-T/30-D12 series includes a special output voltage trimming feature
which is fully compatible with competitive units. The output voltage may be
varied using a single trim resistor from the Trim input to Power Common.
As with other trim adjustments, be sure to use a precision low-tempco resis-
tor (±100ppm/°C.) mounted close to the converter with short leads. Also be
aware that the output voltage accuracy is ±1.5% (typical) therefore you may
need to vary this resistance slightly to achieve your desired output setting.
Use short leads. Mount the leads close to the converter.
Resistor Trim Equation
Where VO is the desired output voltage.
RTRIM (Ω) =
1200
100
VO 0.80
Figure 14. Trim Connections
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LSN2-T30-D12G-C | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:DOSA-SIP, 30A POL DC/DC Converters |
| LSN-3.3/10-D12 | 功能描述:DC/DC转换器 33W 12V to 3.3V 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: |
| LSN-3.3/10-D12B | 功能描述:DC/DC转换器 33W 12V to 3.3V 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: |
| LSN-3.3/10-D12B-C | 功能描述:DC/DC转换器 33W 12V to 3.3V 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: |
| LSN-3.3/10-D12BH | 功能描述:DC/DC转换器 33W 12V to 3.3V 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: |
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