参数资料
型号: MIC2124YMM
厂商: Micrel Inc
文件页数: 16/24页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 10-MSOP
产品培训模块: MIC2124 Synchronous Current Mode DC-DC Buck Controller
标准包装: 100
系列: Hyper Speed Control™
PWM 型: 电流模式
输出数: 1
频率 - 最大: 360kHz
占空比: 93%
电源电压: 3 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 管件
其它名称: 576-3639-5
MIC2124YMM-ND
Micrel, Inc.
D = 0.15
MIC2124
R LOAD = 0.18 ? .
The output capacitor and the inductor parameters are:
C OUT = 760 μ F
ESR COUT = 0.002 ?
L = 2.2 μ H.
Also,
Ri = 0.007 ? x2.4
f SW = 300kHz
Rfb1 = 10k ?
90
70
50
30
10
-10
Gain of Error Amplifier
Phase of Error Amplifier
20
0
-20
-40
-60
-80
Rfb2 = 8.06k ?
The error amplifier gm and external compensation
-30
10
100
1000
10000
-100
100000
component are:
g m = 110 μ S
R1 = 150k ?
C1 = 220pF
f (Hz)
Figure 8. Error Amplifier Bode Plot
C2 = 47pF
The gain and phase of the control-to-output transfer
function predicted by the equation (29) are shown in
120
90
Total Open Loop Gain
Total Open Loop Phase
0
-30
Figure 7. The gain and phase of the error amplifier
transfer function predicted by the equation (32) are
shown in Figure 8. The total open-loop bode plot
predicted by the equation (35) is shown in Figure 9.
30
0
20
-20
60
30
0
-30
-60
-60
-90
-120
-150
-180
10
-40
10
100
1000
10000
100000
f (Hz)
0
-60
-10
-80
Figure 9. Total Open Loop Bode Plot
-20
-30
10
Gain of Control-to-Output
Phase of Control-to-Output
100 1000
10000
-100
-120
100000
The crossover frequency of this MIC2124 buck converter
is 40kHz and the phase margin is about 50°, as shown in
Figure 9.
f (Hz)
Figure 7. Control-to-Output Bode Plot
June 2010
16
M9999-060810-D
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