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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)： | 15/21頁 |
| 文件大?。?/td> | 780K |
| 代理商： | MIC2207 |
Micrel
MIC2207
-30
-20
-10
0
10
20
30
40
50
60
G
FREQUENCY (Hz)
Bode Plot
V
IN
=5V, V
OUT
=1.8V, I
OUT
=3A
-105
1M
-70
-35
0
35
70
105
140
175
210
P
100
1k
10k
100k
L=1μH
C
OUT
= 4.7μF
R1 = 10k
R2 = 12.4k
C
FF
= 82pF
GAIN
PHASE
5Vin, 1.8Vout at 3A load;
Phase Margin=43.1 Degrees
GBW= 218KHz
Being that the MIC2207 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.
-30
-20
-10
0
10
20
30
40
50
60
G
FREQUENCY (Hz)
Bode Plot
V
IN
=3.3V,V
OUT
=1.8V,I
OUT
=50mA
-105
1M
-70
-35
0
35
70
105
140
175
210
P
100
1k
10k
100k
L=1μH
C
OUT
= 4.7μF
R1 = 10k
R2 = 12.4k
C
FF
= 82pF
GAIN
PHASE
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.
Max. Amount of Phase Boost
Obtainable using C
FF
vs. Output
Voltage
0
5
10
15
20
25
30
35
40
45
50
1
2
3
4
5
P
OUTPUT VOLTAGE (V)
V
REF
= 1V
By looking at the graph, phase margin can be
affected to a greater degree with higher output
voltages.
The next bode plot shows the phase margin of a
1.8V output at 3A without a feedforward capacitor.
-30
-20
-10
0
10
20
30
40
50
60
G
FREQUENCY (Hz)
Bode Plot
V
IN
=3.3V, V
OUT
=1.8V, I
OUT
=3A
-105
1M
-70
-35
0
35
70
105
140
175
210
P
100
1k
10k
100k
L=1μH
C
OUT
= 4.7μF
R1 = 10k
R2 = 12.4k
C
FF
= 0pF
GAIN
PHASE
As you can see the typical phase margin, using the
same
resistor
values
feedforward capacitor results in 33.6 degrees of
phase margin. Our prior measurement with a
feedforward capacitor yielded a phase margin of 47
degrees. The feedforward capacitor has given us a
as
before
without
a
April 2005
15
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(fēng)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?fù)?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(biāo)準(zhǔn)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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