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MIC24420 Datasheet(PDF) 22 Page - Micrel Semiconductor

Part No. MIC24420
Description  2.5A Dual Output PWM Synchronous Buck Regulator IC
Download  34 Pages
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC24420 Datasheet(HTML) 22 Page - Micrel Semiconductor

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Micrel, Inc.
MIC24420/MIC24421
June 2012
22
M9999-062012-C
The general form of the feedforward circuit is shown
below.
⎟⎟
⎜⎜
+
⎛ +
×
+
=
ωp3
s
1
ωz3
s
1
R2
R1
R2
H(s)
Where:
+
×
×
×
×
R2
R1
R2
R1
C1
π
2
=
×
×
×
=
1
fp3
C1
R1
π
2
1
fz3
H(s)
Gfilter(s)
Gmod
Gea(s)
T(s)
×
×
×
=
The total open loop transfer function is:
The following tables list the recommended values of
compensation and filter components for different output
voltages. The output capacitors are ceramic.
MIC24420
VOUT
R1
R2
C7/8
C16/17
R22/23
C29/30
LMIN
CoMIN
1.0V
1k
2.32k
220pF
3.3nF
NF
NF
10µH
47µF
1.2V
1k
1.4k
220pF
3.3nF
NF
NF
10µH
47µF
1.4V
1k
1k
220pF
3.3nF
NF
NF
10µH
47µF
1.8V
1k
634
150pF
4.7nF
NF
NF
10µH
47µF
2.5V
1k
383
150pF
10nF
NF
NF
10µH
47µF
3.3V
1k
274
150pF
10nF
NF
NF
10µH
47µF
5.0V
1k
162
150pF
10nF
NF
NF
10µH
47µF
MIC24421
VOUT
R1
R2
C7/8
C16/17
R22/23
C29/30
LMIN
CoMIN
1.0V
1k
2.32k
1000pF
22nF
22k
100nF
22µH
100µF
1.2V
1k
1.4k
1000pF
22nF
22k
100nF
22µH
100µF
1.4V
1k
1k
1000pF
22nF
22k
100nF
22µH
100µF
1.8V
1k
634
1000pF
22nF
22k
100nF
22µH
100µF
2.5V
1k
383
1000pF
22nF
22k
100nF
22µH
100µF
3.3V
1k
274
1000pF
22nF
22k
100nF
22µH
100µF
5.0V
1k
162
1000pF
22nF
22k
100nF
22µH
100µF


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