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LSM2 Series
Single Output, Non-Isolated
Selectable-Output POL DC/DC Converters
R TRIM (W) = _____________ –1000
Don’t Use Pre-Biasing and Sequencing Together
Normally, you would use startup sequencing on multiple DC/DC’s 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 applica-
tions, do not use startup sequencing in a Pre-Bias application, especially with
D12 Models Resistor Trim Equation:
10500
V O – 0.7525
an external active power source. If you have active source pre-biasing, leave
V OUT (Typ.)
0.7525V
1.0V
1.2V
1.5V
1.8V
2.5V
3.3V
5V
the Sequence input open so that the output will step up quickly and safely. A
R TRIM (k ? )
Open
41.424
22.46
13.05
9.024
5.009
3.122 1.472
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 LSM2 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 (pin 4) or an
external DC trim voltage applied between the Trim input and Power Common.
The output voltage range for W3 models is 0.75 to 3.3 Volts. For D12 models,
the output range is 0.75 to 5 Volts.
IMPORTANT: On W3 models only, for outputs greater than 3 Volts up to
3.3 Volts maximum, the input supply must be 4.5 Volts minimum. To retain
Voltage Trim
The LSM2 Series may also be trimmed using an external voltage applied
between the Trim input and Output Common. Be aware that the internal “load”
impedance looking into trim pin is approximately 5 Kilohms. Therefore, you
may have to compensate for this in the source resistance of your external volt-
age reference.
Use a low noise DC reference and short leads. Mount the leads close to the
converter.
Two different trim equations are used for the W3 and D12 models.
W3 Models Voltage Trim Equation:
V TRIM (in Volts) = 0.7 – (0.1698 x (V O – 0.7525))
The LSM2 W3 ?xed trim voltages to set the output voltage are:
proper regulation, do not exceed the 3.3V output.
V OUT (Typ.)
0.7525V
1.0V
1.2V
1.5V
1.8V
2.5V
3.3V
As with other trim adjustments, be sure to use a precision low-tempco
V TRIM
Open
0.6928V
0.624V
0.5731V 0.5221V 0.4033V
0.267V
resistor (±100 ppm/°C) mounted close to the converter with short leads. Also
be aware that the output voltage accuracy is ±2% (typical) therefore you may
need to vary this resistance slightly to achieve your desired output setting.
Two different trim equations are used for the W3 and D12 models.
W3 Models Resistor Trim Equation:
D12 Models Voltage Trim Equation:
V TRIM (in Volts) = 0.7 – (0.0667 x (V O – 0.7525))
The LSM2 D12 ?xed trim voltages to set the output voltage are:
R TRIM (W) = _____________ – 5110
21070
V O – 0.7525
V OUT (Typ.)
0.7525V
1.0V
1.2V
1.5V
1.8V
2.5V
3.3V
5V
V TRIM
Open
0.6835 0.670
0.650
0.630
0.583
0.530 0.4166
The W3 models ?xed trim resistors to set the output voltage are:
V OUT (Typ.)
R TRIM (k ? )
0.7525V
Open
1.0V
80.021
1.2V
41.973
1.5V
23.077
1.8V
15.004
2.5V
6.947
3.3V
3.16
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M D C_LSM2 Series.C01 Δ Page 8 of 17
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相关代理商/技术参数
LSM2-T/16-D12N-C
制造商:Murata Power Solutions 功能描述:DC/DC Converter
LSM2-T/16-D12NG
制造商:Murata Power Solutions 功能描述:Module DC-DC 1-OUT 0.75V to 5V 16A 80W 8-Pin Case C62
LSM2-T/16-D12NG-C
功能描述:DC/DC转换器 52.8W SINGLE OUTPUT 12V / 0.75-5V16A 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:
LSM2-T/16-W3
制造商:Murata Power Solutions 功能描述:Module DC-DC 1-OUT 0.75V to 3.3V 16A 52.8W 8-Pin Case 62
LSM2-T/16-W3-C
功能描述:DC/DC转换器 52.8W SINGLE OUTPUT 5V / 0.75-3.3V16A
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:
LSM2-T/16-W3G
制造商:Murata Power Solutions 功能描述:Module DC-DC 1-OUT 0.75V to 3.3V 16A 52.8W 8-Pin Case C62
LSM2-T/16-W3G-C
功能描述:DC/DC转换器 52.8W SINGLE OUTPUT 5V / 0.75-3.3V16A 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:
LSM2-T/16-W3N
制造商:Murata Power Solutions 功能描述:Module DC-DC 1-OUT 0.75V to 3.3V 16A 52.8W 8-Pin Case C62