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參數(shù)資料
| 型號： | MIC2169MM |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 500 KHZ PWM SYNCHRONOUS BUCK CONTROL IC |
| 中文描述： | 500千赫的PWM同步降壓控制IC |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 160K |
| 代理商： | MIC2169MM |
MIC2169
Micrel
M9999-111803
12
November 2003
Figures 7 and 8 show the gain and phase curves for the above
transfer function with R1 = 9.3k, C1 = 1000pF, C2 = 100pF,
and g
m
= .005
–
1
. It can be seen that at 50kHz, the error
amplifier exhibits approximately 45
°
of phase margin.
1.10
3
1000
1.10
4
1.10
5
1.10
6
1.10
7
20
40
60
60
.001
E
10000000
f
Figure 7. Error Amplifier Gain Curve
10
10
100
1.10
3
1.10
4
1.10
5
1.10
6
260
240
220
200
215.856
270
E
1000000
f
Figure 8. Error Amplifier Phase Curve
Total Open-Loop Response
The open-loop response for the MIC2169 controller is easily
obtained by adding the power path and the error amplifier
gains together, since they already are in Log scale. It is
desirable to have the gain curve intersect zero dB at tens of
kilohertz, this is commonly called crossover frequency; the
phase margin at crossover frequency should be at least 45
°
.
Phase margins of 30
°
or less cause the power supply to have
substantial ringing when subjected to transients, and have
little tolerance for component or environmental variations.
Figures 9 and 10 show the open-loop gain and phase margin.
It can be seen from Figure 9 that the gain curve intersects the
0dB at approximately 50kHz, and from Figure 10 that at
50kHz, the phase shows approximately 50
°
of margin.
100
100
1.10
3
1.10
4
1.10
5
1.10
6
50
0
50
100
71.607
42.933
O
1000000
f
Figure 9. Open-Loop Gain Margin
10
10
100
1.10
3
1.10
4
1.10
5
1.10
6
350
360
300
250
269.097
1000000
f
O
Figure 10. Open-Loop Phase Margin
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