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參數(shù)資料
| 型號： | MR2920 |
| 廠商： | Shindengen Electric Manufacturing Company, Ltd. |
| 英文描述： | Provision for Standby mode operation Partial Resonance Power Supply IC Module |
| 中文描述： | 撥備待機模式操作局部共振電源IC模塊 |
| 文件頁數(shù)： | 6/19頁 |
| 文件大小： | 226K |
| 代理商： | MR2920 |
Shindengen Electric MFG.CO.,LTD
- 6 -
3.1 Start-up Circuit
In conventional start-up circuits employing a start-up
resistor, current continues to flow following power supply
start-up, thus wasting power and reducing efficiency,
particularly during standby.
See Fig.3.1 Comparison of Start-up Circuits - Conventional
Start-up Circuit.
In the MR2000 Series start-up circuit the start-up current is
supplied from the input voltage at power supply start-up,
and is shut-off when the power supply is in operation.
The start-up circuit supplies a current of 12mA (typical) from
the IC internal constant current source until the voltage at
the V
cc
pin reaches 14V (typical). This current is consumed
internally in the IC as well as being used as the charging
current for the condenser connected externally between the
V
cc
pin and GND.
This design allows a stable start-up only minimally
dependent upon input voltage.
When the voltage at the V
cc
pin reaches 14V (typical) the
start-up circuit is disconnected, the start-up current no
longer flows and oscillation begins simultaneously.
The current consumed in the IC is then supplied from the
control coil. See Fig.3.1 Comparison of Start-up Circuits -
MR2000 Start-up Circuit.
In the case of an instantaneous power failure or a load
short, oscillation is stopped when the voltage at the V
cc
pin reaches 8.5V, and when this voltage drops to 7.6V the start-up circuit
operates again and the voltage at the V
cc
pin then begins rising. See Fig.3.2.
Incorporation of the functions described above improve efficiency, particularly during standby, and reduces the number of start-up
resistors required, thus reducing the overall number of components.
Fig.3.1 Comparison of Start-up Circuits
Fig.3.2 Start-up Circuit Operation Sequence
3. Operation Description
MR2900
Application Note
Load short
Instantaneous power failure
【
V
OUT
】
V
CC(startup on)
=7.6V
【
V
CE
】
V
CC(stop)
=8.5V
V
CC(startup off)
=
V
CC(Start)
=14.0V
【
V
CC
】
【
Vin
】
Vcc pin
Vin pin
5
4
V
cc(startup off)
/V
cc(startup on)
14.5V/7.2V
【
MR2000 Start-up Circuit
】
Control coil
Start-up current switched off
following start-up, thus
eliminating the need for start-up
resistors.
【
Conventional Start-up Circuit
】
IC
Start-up
current
Start-up current flows even
during steady-state operation,
resulting in losses.
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相關代理商/技術參數(shù) |
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|---|---|
| MR2920-4109F12 | 功能描述:開關變換器、穩(wěn)壓器與控制器 VDS=900 Dev=IGBT RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MR2920-7109F12 | 功能描述:開關變換器、穩(wěn)壓器與控制器 VDS=900 Dev=IGBT RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MR2940 | 制造商:SHINDENGEN 制造商全稱:Shindengen Electric Mfg.Co.Ltd 功能描述:Standby Compatible Partial Resonance Power Supply IC Module with High-speed IGBT |
| MR2940-4109F12 | 功能描述:開關變換器、穩(wěn)壓器與控制器 VDS=900 Dev=IGBT RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MR2940-7109F12 | 功能描述:開關變換器、穩(wěn)壓器與控制器 VDS=900 Dev=IGBT RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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