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參數(shù)資料
| 型號(hào)： | 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)： | 15/21頁 |
| 文件大?。?/td> | 914K |
| 代理商： | MIC4720 |
Micrel, Inc.
MIC4720
The following Bode analysis show the small signal loop
stability of the MIC4720, it utilizes type III compensation.
This is a dominant low frequency pole, followed by 2
zeros and finally the double pole of the inductor
capacitor filter, creating a final 20dB/decade roll off.
Bode analysis gives us a few important data points;
speed of response (Gain Bandwidth or GBW) and loop
stability. Loop speed or GBW determines the response
time to a load transient. Faster response times yield
smaller voltage deviations to load steps.
May 2007
15
M9999-051707
Instability in a control loop occurs when there is gain and
positive feedback. Phase margin is the measure of how
stable the given system is. It is measured by determining
how far the phase is from crossing zero when the gain is
equal to 1 (0dB).
Typically for 3.3Vin and 1.8Vout at 2A;
Phase Margin=47 Degrees
GBW=156KHz
Gain will also increase with input voltage. The following
graph shows the increase in GBW for an increase in
supply voltage.
5Vin, 1.8Vout at 2A load;
Phase Margin=43.1 Degrees
GBW= 218KHz
Being that the MIC4720 is non-synchronous; the
regulator only has the ability to source current. This
means that the regulator has to rely on the load to be
able to sink current. This causes a non-linear response
at light loads. The following plot shows the effects of the
pole created by the nonlinearity of the output drive
during light load (discontinuous) conditions.
3.3Vin, 1.8Vout Iout=50mA;
Phase Margin=90.5 Degrees
GBW= 64.4KHz
Feed Forward Capacitor
The feedback resistors are a gain reduction block in the
overall system response of the regulator. By placing a
capacitor from the output to the feedback pin, high
frequency signal can bypass the resistor divider, causing
a gain increase up to unity gain.
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
G
FREQUENCY (Hz)
Gain and Phase
vs. Frequency
0
5
10
15
20
25
P
100
1k
10k
100k
1M
L=1μH
C
OUT
= 4.7μF
R1 = 10k
R2 = 12.4k
C
FF
= 82pF
GAIN
PHASE
The graph above shows the effects on the gain and
phase of the system caused by feedback resistors and a
feedforward capacitor. The maximum amount of phase
boost achievable with a feedforward capacitor is
graphed below.
相關(guān)PDF資料 |
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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