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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： | 11/14页 |
| 文件大小： | 1755K |
| 代理商： | LQN-0.8/50-D12B-C |
Figure 4.Trim Connections Using Fixed Resistors
Figure 3.Trim Connections Using a Trimpot
Note:
Install either a fixed
trim-up resistor
or a fixed trim-down
resistor depending upon
desired output voltage.
Trim Equations
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.
Note: LQN-0.8/50-D12 is not trimmable.
UP
VO – VO NOM
RT (k ) =
0.4
DOWN
VO NOM – VO
RT
(k ) =
– X
0.5(VO – 0.8)
UP
VO – VO NOM
RT (k ) =
1.0
DOWN
VO NOM – VO
RT
(k ) =
– 2.05
1.24(VO – 0.8)
UP
VO – VO NOM
RT (k ) =
1.3
DOWN
VO NOM – VO
RT
(k ) =
– 4.02
1.62(VO – 0.8)
UP
VO – VO NOM
RT (k ) =
6
DOWN
VO NOM – VO
RT
(k ) =
– X
7.5(VO – 0.8)
LQN-1/50-D12:
X = 0.392
LQN-1.8/50-D12:
X = 1.82
LQN-2/50-D12:
X = 1.3
LQN-3.3/45-D12:
X = 1.0
LQN-2.5/45-D12:
X = 15.8
LQN-1.5/50-D12
UP
VO – 5
RT (k ) =
0.399
DOWN
5 – VO
RT
(k ) =
– 0.576
0.49(VO – 0.8)
LQN-5/45-D12
LQN-1.2/50-D12
Minimum Output Loading Requirements
LQN converters employ a synchronous-rectifier design topology and all models
regulate within spec and are stable under no-load to full load conditions.
Operation under no-load conditions however might slightly increase the output
ripple and noise.
Thermal Shutdown
The LQN converters are equipped with thermal-shutdown circuitry. If environ-
mental conditions cause the temperature of the DC/DC converter to rise above
the designed operating temperature, a precision temperature sensor will power
down the unit. When the internal temperature decreases below the threshold
of the temperature sensor, the unit will self start. See Performance/Functional
Specifications.
Output Overvoltage Protection
The LQN output voltage is monitored for an overvoltage condition using a com-
parator. The signal is optically coupled to the primary side and if the output volt-
age rises to a level which could be damaging to the load, the sensing circuitry
will power down the PWM controller causing the output voltage to decrease.
Following a time-out period the PWM will restart, causing the output voltage
to ramp to its appropriate value. If the fault condition persists, and the output
voltage again climbs to excessive levels, the overvoltage circuitry will initiate
another shutdown cycle. This on/off cycling is referred to as "hiccup" mode.
The LQN Series will withstand higher external sources several volts above
the nominal output. However, if there is a chance of consistent overvoltage,
users should provide an external voltage clamp or other protection.
Output Overcurrent Detection
Overloading the power converter's output for an extended time will invariably
cause internal component temperatures to exceed their maximum ratings
and eventually lead to component failure. High-current-carrying components
such as inductors, FET's and diodes are at the highest risk. LQN Series DC/DC
converters incorporate an output overcurrent detection and shutdown function
that serves to protect both the power converter and its load.
If the output current exceeds it maximum rating by typically 40% or if the
output voltage drops to less than 98% of it original value, the LQN's internal
overcurrent-detection circuitry immediately turns off the converter, which then
goes into a "hiccup" mode. While hiccupping, the converter will continuously
attempt to restart itself, go into overcurrent, and then shut down. Under these
conditions, both the average output current and the average input current will
be kept extremely low. Once the output short is removed, the converter will
automatically restart itself.
Output Voltage Trimming
Allowable trim ranges are ±10%. Trimming is accomplished with either a
trimpot or a single fixed resistor. The trimpot should be connected between
+Output and Common with its wiper connected to the Trim pin as shown in
Figure 3 below.
A trimpot can be used to determine the value of a single fixed resistor
which can then be connected, as shown in Figure 4, between the Trim pin and
+Output to trim down the output voltage, or between the Trim pin and Common
to trim up the output voltage. Fixed resistors should have absolute TCR’s less
than 100ppm/
°C to ensure stability.
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
MDC_LQN D12 Models.B03 Page 6 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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