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MIC2124YMM Datenblatt(PDF) 16 Page - Micrel Semiconductor

Teilenummer MIC2124YMM
Bauteilbeschribung  Constant Frequency, Synchronous Current Mode Buck Controller
PDF  24 Pages
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Hersteller  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2124YMM Datenblatt(HTML) 16 Page - Micrel Semiconductor

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Micrel, Inc.
MIC2124
June 2010
16
M9999-060810-D
D = 0.15
RLOAD = 0.18Ω.
The output capacitor and the inductor parameters are:
COUT = 760μF
ESRCOUT = 0.002Ω
L = 2.2μH.
Also,
Ri = 0.007Ωx2.4
fSW = 300kHz
Rfb1 = 10kΩ
Rfb2 = 8.06kΩ
The error amplifier gm and external compensation
component are:
gm = 110μS
R1 = 150kΩ
C1 = 220pF
C2 = 47pF
The gain and phase of the control-to-output transfer
function predicted by the equation (29) are shown in
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
-20
-10
0
10
20
30
10
100
1000
10000
100000
f (Hz)
-120
-100
-80
-60
-40
-20
0
Gain of Control-to-Output
Phase of Control-to-Output
Figure 7. Control-to-Output Bode Plot
-30
-10
10
30
50
70
90
10
100
1000
10000
100000
f (Hz)
-100
-80
-60
-40
-20
0
20
Gain of Error Amplifier
Phase of Error Amplifier
Figure 8. Error Amplifier Bode Plot
-60
-30
0
30
60
90
120
10
100
1000
10000
100000
f (Hz)
-180
-150
-120
-90
-60
-30
0
Total Open Loop Gain
Total Open Loop Phase
Figure 9. Total Open Loop Bode Plot
The crossover frequency of this MIC2124 buck converter
is 40kHz and the phase margin is about 50°, as shown in
Figure 9.



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