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参数资料
| 型号： | LSN-0.8/15-D12J |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | SIP-10 |
| 文件页数： | 7/10页 |
| 文件大小： | 489K |
| 代理商： | LSN-0.8/15-D12J |
LSN-15A D12 Series
NON-ISOLA TED , 12-75W SIP DC/DC CONVER TERS
Thermal Considerations and Thermal Protection
The typical output-current thermal-derating curves shown below enable
designers to determine how much current they can reliably derive from each
model of the LSN D12 SIP's under known ambient-temperature and air-ow
conditions. Similarly, the curves indicate how much air ow is required to
reliably deliver a specic output current at known temperatures.
The highest temperatures in LSN D12 SIP's occur at their output inductor,
whose heat is generated primarily by I2R losses. The derating curves were
developed using thermocouples to monitor the inductor temperature and
varying the load to keep that temperature below +110°C under the assorted
conditions of air ow and air temperature. Once the temperature exceeds
+115°C (approx.), the thermal protection will disable the converter. Automatic
restart occurs after the temperature has dropped below +110°C.
All but the last two DUT's were vertical-mount models, and the direction of air
ow was parallel to the unit in the direction from pin 11 to pin 1.
As you may deduce from the derating curves and observe in the efciency
curves on the following pages, LSN D12 SIP's maintain virtually constant
efciency from half to full load, and consequently deliver very impressive
temperature performance even if operating at full load.
Lastly, when LSN D12 SIP's are installed in system boards, they are obvi-
ously subject to numerous factors and tolerances not taken into account here.
If you are attempting to extract the most current out of these units under
demanding temperature conditions, we advise you to monitor the output-
inductor temperature to ensure it remains below +110°C at all times.
Thermal Performance for "H" Models
Enhanced thermal performance can be achieved when LSN D12 SIP's are
mounted horizontally ("H" models) and the output inductor (with its electrically
isolating, thermally conductive pad installed) is thermally coupled to a copper
plane/pad (at least 0.55 square inches in area) on the system board. Your
conditions may vary, however our tests indicate this conguration delivers a
16°C to 22°C improvement in ambient operating temperatures. See page 7
for thermal comparison of two horizontally mounted units.
6
Output Reverse Conduction
Many DC/DC's using synchronous rectication suffer from Output Reverse
Conduction. If those devices have a voltage applied across their output before
a voltage is applied to their input (this typically occurs when another power
supply starts before them in a power-sequenced application), they will either
fail to start or self destruct. In both cases, the cause is the "freewheeling" or
"catch" FET biasing itself on and effectively becoming a short circuit.
LSN D12 SIP DC/DC converters do not suffer from Output Reverse Conduc-
tion. They employ proprietary gate drive circuitry that makes them immune
to applied output voltages.
Note: Resistor values are in k
. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. VO
NOM = nominal output voltage.
Trim Equations
UP
VO – VO NOM
RT (k) =
0.349
DOWN
VO NOM – VO
RT
(k) =
– X
0.499(VO – 0.7)
UP
VO – VO NOM
RT (k) =
0.868
DOWN
VO NOM – VO
RT
(k) =
–4.75
1.24(VO – 0.7)
UP
VO – VO NOM
RT (k) =
1.435
DOWN
VO NOM – VO
RT
(k) =
– X
2.05(VO – 0.7)
LSN-0.8/15-D12:
X = 3.32
LSN-1/15-D12:
X = 2.21
LSN-1.2/15-D12
UP
VO – VO NOM
RT (k) =
1.743
DOWN
VO NOM – VO
RT
(k) =
–7.5
2.49(VO – 0.7)
LSN-1.8/15-D12
UP
VO – VO NOM
RT (k) =
4.438
DOWN
VO NOM – VO
RT
(k) =
–12.7
6.34(VO – 0.7)
LSN-2.5/15-D12
LSN-1.5/15-D12:
X = 6.81
LSN-2/15-D12:
X = 5.11
UP
VO – VO NOM
RT (k) =
5.25
DOWN
VO NOM – VO
RT
(k) =
– X
7.5(VO – 0.7)
LSN-3.3/15-D12:
X = 12.1
LSN-5/15-D12:
X = 7.5
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| LSN-1.1/10-D12B | 功能描述:DC/DC转换器 11W 12V to 1.1V 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-1.1/10-D12B-C | 功能描述:DC/DC转换器 11W 12V to 1.1V 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-1.1/10-D12BH | 功能描述:DC/DC转换器 11W 12V to 1.1V 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-1.1/10-D12BH-C | 功能描述:DC/DC转换器 11W 12V to 1.1V 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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