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参数资料
| 型号： | MIC4724YMME |
| 厂商： | Micrel Inc |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 10MSOP |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1V |
| 输入电压： | 3 V ~ 6 V |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 产品目录页面： | 1093 (CN2011-ZH PDF) |
| 其它名称： | 576-3120-5 |
Micrel, Inc.
The following Bode analysis show the small signal loop
stability of the MIC4724, 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;
MIC4724
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.
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.
V =3.3V,V
IN
60
50
Bode Plot
=1.8V,I =50mA
OUT OUT
210
175
60 IN
210
PHASE
-10 R1 = 10k
R2 = 12.4k
-20 C = 82pF
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).
Bode Plot
V =3.3V, V =1.8V, I =3A
OUT OUT
50 175
40 140
30 105
20 70
40 PHASE
30
20
10 L=1μH
0 C OUT = 4.7μF
GAIN
FF
-30
100 1k 10k 100k
FREQUENCY (Hz)
3.3Vin, 1.8Vout Iout=50mA;
? Phase Margin=90.5 Degrees
140
105
70
35
0
-35
-70
-105
1M
0 C OUT = 4.7μF
-20 C = 82pF
10 L=1μH
GAIN
-10 R1 = 10k
R2 = 12.4k
FF
-30
100 1k 10k 100k
FREQUENCY (Hz)
Typically for 3.3Vin and 1.8Vout at 3A;
35
0
-35
-70
-105
1M
? 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.
?
Phase Margin=47 Degrees
Gain and Phase
L=1μH
-1 C = 4.7μF GAIN
-2 R1 = 10k
? GBW=156KHz
Gain will also increase with input voltage. The following
graph shows the increase in GBW for an increase in
supply voltage.
vs. Frequency
0
OUT
-3 R2 = 12.4k
-4 C FF = 82pF
25
20
15
60 IN
50
40
Bode Plot
V =5V, V =1.8V, I
OUT OUT
PHASE
=3A
210
175
140
-5
-6
-7
-8
-9
PHASE
10
5
30
105
-10
100
1k
10k
100k
0
1M
-20 C = 82pF
20
10 L=1μH GAIN
0 C OUT = 4.7μF
-10 R1 = 10k
R2 = 12.4k
FF
-30
100 1k 10k 100k
FREQUENCY (Hz)
5Vin, 1.8Vout at 3A load;
?
Phase Margin=43.1 Degrees
?
GBW= 218KHz
70
35
0
-35
-70
-105
1M
FREQUENCY (Hz)
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.
Being that the MIC4724 is non-synchronous; the
June 2008
14
M9999-062408-A
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