- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄39203 > LEN-1.8/28-D12H-C (MURATA POWER SOLUTIONS INC) 1-OUTPUT DC-DC REG PWR SUPPLY MODULE PDF資料下載
參數(shù)資料
| 型號(hào)： | LEN-1.8/28-D12H-C |
| 廠商： | MURATA POWER SOLUTIONS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, EIGHTH BRICK PACKAGE-10 |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大小： | 355K |
| 代理商： | LEN-1.8/28-D12H-C |
MDC_LEN D12 Models.B01 Page 5 of 10
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
Figure 2. Driving the On/Off Control Pin
Dynamic control of the on/off function is best accomplished with a
mechanical relay or open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should be able to sink appropriate current when
activated and withstand appropriate voltage when deactivated.
The on/off control can be driven using a circuit comparable to that shown in
Figure 2. Leaving the On/Off control pin open or applying a voltage between 0V
and +0.4V will turn on the converter. Applied voltages between +2.8V and +VIN
will disable the converter.
Power-up Sequencing
If a controlled start-up of one or more LEN D12 Series DC/DC converters
is required, or if several output voltages need to be powered-up in a given
sequence, the On/Off control pin can be pulled high to +VIN with an external
5.6k
Ω restistor. While input voltage and/or other converters are ramping up,
the control pin is pulled high and the converter remains disabled. To enable
the output voltage, the control pin needs to be pulled low in the conguration
shown in Figure 3.
+INPUT
COMMON
ON/OFF
CONTROL
2.5V
+
–
Optional
Pullup
10k
Small
Signal
Transistor
20k
ON/OFF pin open: Logic Low = DC/DC converter On
ON/OFF pin >2.8V: Logic High = DC/DC converter Off
+INPUT
COMMON
ON/OFF
CONTROL
2.5V
+
–
5.6k
20k
External Input Open: On/Off pin High = DC/DC converter Off
External Input Low: On/Off pin Low = DC/DC converter On
Figure 3. Driving The Power-Up With An External Pull-up Resistor
Output Overvoltage Protection
The LEN D12 Series output voltage is monitored. If the output voltage rises
to a level, which could be damaging to the load, the internal 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.
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. LEN D12 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% (35 Amps)
or if the output voltage drops to less than 98% of it original value, the LEN
D12's internal overcurrent-detection circuitry immediately turns off the con-
verter, 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 for models
≥1.8VOUT are ±10%, and for models 1.5VOUT
and lower +10%/–3% (no trim for 0.8V models). Trimming is accomplished
with either a trimpot or a single xed resistor. The trimpot should be connected
between +Output and Common with its wiper connected to the Trim pin as
shown in Figure 4.
Figure 4. Trim Connections Using a Trimpot
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LEN-1.5/28-D12H-C | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LEN-5/25-D12H | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LEN-1.2/28-D12H | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LEN-1/28-D12H-C | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LEN-0.8/28-D12MH | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LEN-2.5/28-D12 | 功能描述:DC/DC轉(zhuǎn)換器 70W 12V to 2.5V 28A RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| LEN-2.5/28-D12B-C | 功能描述:DC/DC轉(zhuǎn)換器 70W 12V to 2.5V 28A RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| LEN-2.5/28-D12-C | 功能描述:DC/DC轉(zhuǎn)換器 70W 12V to 2.5V 28A RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| LEN-2.5/28-D12H-C | 功能描述:DC/DC轉(zhuǎn)換器 70W 12V to 2.5V 28A HEAT SINK RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| LEN-2.5/28-D12M | 制造商:Murata Power Solutions 功能描述:Module DC-DC 1-OUT 2.5V 28A 10-Pin 1/8-Brick |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。