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參數(shù)資料
| 型號： | MIC2207 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 3mmx3mm 2MHz 3A PWM Buck Regulator |
| 中文描述： | 3mmx3mm 2MHz的3A PWM降壓調(diào)節(jié) |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 780K |
| 代理商： | MIC2207 |
Micrel
MIC2207
phase boost of 13.4 degrees (47 degrees- 33.6
Degrees = 13.4 Degrees).
Output Impedance and Transient
response
Output impedance, simply stated, is the amount of
output voltage deviation vs. the load current
deviation. The lower the output impedance, the
better.
V
Z
OUT
OUT
OUT
I
=
Output impedance for a buck regulator is the parallel
impedance of the output capacitor and the MOSFET
and inductor divided by the gain;
DCR
R
Z
=
COUT
L
DSON
TOTAL
X
GAIN
X
+
+
To measure output impedance vs. frequency, the
load current must be load current must be swept
across the frequencies measured, while the output
voltage is monitored. Fig 9 shows a test set-up to
measure output impedance from 10Hz to 1MHz
using the MIC5190 high speed controller.
By setting up a network analyzer to sweep the
feedback current, while monitoring the output of the
voltage regulator and the voltage across the load
resistance, output impedance is easily obtainable.
To keep the current from being too high, a DC offset
needs to be applied to the network analyzer’s source
signal. This can be done with an external supply and
50 Ohm resistor. Make sure that the currents are
verified with an oscilloscope first, to ensure the
integrity of the signal measurement. It is always a
good idea to monitor the A and R measurements
with a scope while you are sweeping it. To convert
the network analyzer data from dBm to something
more useful (such as peak to peak voltage and
current in our case);
707
.
2
50
1mW
10
V
10
dBm
×
×
×
=
and peak to peak current;
LOAD
10
dBm
R
707
.
2
50
1mW
×
10
I
×
×
×
=
The following graph shows output impedance vs
frequency at 2A load current sweeping the AC
current from 10Hz to 10MHz, at 1A peak to peak
amplitude.
0.001
0.01
0.1
1
O
FREQUENCY (Hz)
Output Impedance
vs. Frequency
100
1k
10k 100k
1M
V
OUT
=1.8V
L=1μH
C
OUT
=4.7μF + 0.1μ
5V
IN
3.3VIN
10
From this graph, you can see the effects of
bandwidth and output capacitance. For frequencies
<200KHz, the output impedance is dominated by the
gain and inductance. For frequencies >200KHz, the
output impedance is dominated by the capacitance.
A good approximation for transient response can be
calculated from determining the frequency of the
load step in amps per second;
π
2
A/sec
=
f
Figure 9. Output Impedance Measurement
April 2005
16
M9999-040705
www.micrel.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2207_10 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3mm x 3mm 2MHz 3A PWM Buck Regulator |
| MIC2207YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3mmx3mm 2MHz 3A PWM Buck Regulator |
| MIC2207YML TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A 2MHz Integrated Switch Buck Regulator (Lead Free) 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC2207YML-EV | 功能描述:MIC2207 - DC/DC, Step Down 1, Non-Isolated Outputs Evaluation Board 制造商:microchip technology 系列:- 零件狀態(tài):有效 主要用途:DC/DC，步降 輸出和類型:1，非隔離 功率 - 輸出:- 電壓 - 輸出:1.8V 電流 - 輸出:3A 電壓 - 輸入:2.7 V ~ 5.5 V 穩(wěn)壓器拓撲:降壓 頻率 - 開關(guān):2MHz 板類型:完全填充 所含物品:板 使用的 IC/零件:MIC2207 標準包裝:1 |
| MIC2207YMLTR | 制造商:Micrel 功能描述:DC-DC Converter Single Buck 2.7 - 5.5V |
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