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參數(shù)資料
| 型號： | MIC4720 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 400 W Transient Voltage Suppressor, SOD123W (SOD2 FlatPower), Reel Pack, SMD |
| 中文描述： | 采用3mm x 3mm 2.0MHz甲集成開關(guān)降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 914K |
| 代理商： | MIC4720 |
Micrel, Inc.
MIC4720
determines whether the dominant factor in conduction
losses will be the internal MOSFET or the Schottky
diode. Higher duty cycles place the power losses on the
high side switch, and lower duty cycles place the power
losses on the Schottky diode.
May 2007
12
M9999-051707
Inductor conduction losses (P
L
) can be calculated by
multiplying the DC resistance (DCR) times the square of
the output current;
2
OUT
L
I
DCR
P
×
=
Figure 6. Switching Transition Losses
Normally, when the switch is on, the voltage across the
switch is low (virtually zero) and the current through the
switch is high. This equates to low power dissipation.
When the switch is off, voltage across the switch is high
and the current is zero, again with power dissipation
being low. During the transitions, the voltage across the
switch (V
S-D
) and the current through the switch (I
S-D
) are
at middle, causing the transition to be the highest
instantaneous power point. During continuous mode,
these losses are the highest. Also, with higher load
currents, these losses are higher. For discontinuous
operation, the transition losses only occur during the “off”
transition since the “on” transitions there is no current
flow through the inductor.
Also, be aware that there are additional core losses
associated with switching current in an inductor. Since
most inductor manufacturers do not give data on the
type of material used, approximating core losses
becomes very difficult, so verify inductor temperature
rise.
Switching losses occur twice each cycle, when the
switch turns on and when the switch turns off. This is
caused by a non-ideal world where switching transitions
are not instantaneous, and neither are currents. Figure 6
demonstrates how switching losses due to the
transitions dissipate power in the switch.
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PDF描述 |
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| MIC4720BML | 400 W Transient Voltage Suppressor, SOD123W (SOD2 FlatPower), Reel Pack, SMD |
| MIC4720YML | 400 W Transient Voltage Suppressor, SOD123W (SOD2 FlatPower), Reel Pack, SMD |
| MIC4720YMME | Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder, SOT313-2 (LQFP48), Tray Pack, Bakeable, Single |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4720BML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3mm x 3mm 2.0MHz 2A Integrated Switch Buck Regulator |
| MIC4720YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3mm x 3mm 2.0MHz 2A Integrated Switch Buck Regulator |
| MIC4720YML TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2A 2MHz Buck Regulator in MLF RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC4720YML-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 1V 1 Output 2A 12-VFDFN Exposed Pad, 12-MLF? 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出類型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:2.7V 電壓 - 輸入（最大值）:5.5V 電壓 - 輸出（最小值/固定）:1V 電壓 - 輸出（最大值）:5.5V 電流 - 輸出:2A 頻率 - 開關(guān):2MHz 同步整流器:無 工作溫度:-40°C ~ 125°C （TJ） 安裝類型:表面貼裝 封裝/外殼:12-VFDFN 裸焊盤，12-MLF? 供應(yīng)商器件封裝:12-MLF?（4x4） 標(biāo)準(zhǔn)包裝:1 |
| MIC4720YMME | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2A 2MHz Buck Regulator in epad MSOP-10 Pkg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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