参数资料
型号: MIC2169YMM
厂商: Micrel Inc
文件页数: 12/15页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 10-MSOP
标准包装: 100
PWM 型: 电压模式
输出数: 1
频率 - 最大: 550kHz
占空比: 92%
电源电压: 3 V ~ 14.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 管件
产品目录页面: 1092 (CN2011-ZH PDF)
其它名称: 576-1710-5
MIC2169YMM-ND
MIC2169
100
71.607
50
0
Micrel
1.10
1 .10
1 .10
1 .10
42.933
50
100
100
3
f
4
5
6
1000000
Figure 8. Error Ampli ? er 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 ampli ? er
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.
250
269.097
300
Figure 9. Open-Loop Gain Margin
1.10
1 .10
1 .10
1 .10
Figures9and10showtheopen-loopgainandphasemargin.
It can be seen from Figure 9 that the gain curve intersects
the 0dB at approximately 50kHz, and from Figure 10, that at
350
360
10
10
100
3
f
4
5
6
1000000
50kHz, the phase shows approximately 50° of margin.
Figure 10. Open-Loop Phase Margin
M9999-032409
12
March 2009
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