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参数资料
| 型号： | LSN2-T/22-D12NB-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, SIP-9 |
| 文件页数： | 13/13页 |
| 文件大小： | 1173K |
| 代理商： | LSN2-T/22-D12NB-C |
LSN2-T/22-D12
Non-isolated, DOSA-SIP,
22A Selectable-Output DC/DC Converters
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
MDC_LSN2-T/22-D12_B02 Page 9 of 13
These diagrams illustrate the time and slew rate relationship between two
typical power output voltages. Generally the Master will be a primary power
voltage in the system which must be present first or coincident with any
Slave power voltages. The Master output voltage is connected to the Slave’s
Sequence input, either by a voltage divider, divider-plus-capacitor or some
other method. Several standard sequencing architectures are prevalent. They
are concerned with three factors:
n
The time relationship between the Master and Slave voltages
n
The voltage difference relationship between the Master and Slave
n
The voltage slew rate (ramp slope) of each converter’s output.
For most systems, the time relationship is the dominant factor. The voltage
difference relationship is important for systems very concerned about possible
latchup of programmable devices or overdriving ESD diodes. Lower slew
rates avoid overcurrent shutdown during bypass cap charge-up.
In Figure 18, two POL’s ramp up at the same rate until they reach their dif-
ferent respective final set point voltages. During the ramp, their voltages are
nearly identical. This avoids problems with large currents flowing between
Figures 10 and 11 show both delayed start up and delayed final voltages for
two converters. Figure 10 is called “Inclusive” because the later starting POL
finishes inside the earlier POL. The timing in Figure 10 is more easily built
using a combined digital sequence controller and the Sequence/Track pin.
Figure 11 is the same strategy as Figure 10 but with an “exclusive” timing
relationship staggered approximately the same at power-up and power-down.
Operation
To use the Sequence pin after power start-up stabilizes, apply a rising external
voltage to the Sequence input. As the voltage rises, the output voltage will
track the Sequence input (gain = 1). The output voltage will stop rising
when it reaches the normal set point for the converter. The Sequence input
may optionally continue to rise without any effect on the output. Keep the
Sequence input voltage below the converter’s input supply voltage.
Use a similar strategy on power down. The output voltage will stay constant
until the Sequence input falls below the set point.
Any strategy may be used to deliver the power up/down ramps. The circuits
below show simple RC networks but you may also use operational amplifiers,
D/A converters, etc.
Circuits
The circuits shown in Figures 12 through 14 introduce several concepts when
using these Sequencing controls on Point-of-Load (POL) converters. These
circuits are only for reference and are not intended as final designs ready for
your application. Also, numerous connections are omitted for clarity.
Figure 8. Coincident or Simultaneous Phasing (Identical Slew Rates)
Figure 9. Proportional or Ratiometric Phasing (Identical VOUT Time)
Figure 10. Staggered or Sequential Phasing—Inclusive (Fixed Delays)
Figure 11. Staggered or Sequential Phasing—Exclusive
(Fixed Cascaded Delays)
logic systems which are not initialized yet. Since both end voltages are differ-
ent, each converter reaches it’s setpoint voltage at a different time.
Figure 9 shows two POL’s with different slew rates in order to reach differing
final voltages at about the same time.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LSN2-T30-D12 | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:DOSA-SIP, 30A POL DC/DC Converters |
| LSN2-T30-D12-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 |
| 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: |
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