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MAX20002CATPC Datasheet(PDF) 16 Page - Maxim Integrated Products

No. de pieza MAX20002CATPC
Descripción Electrónicos  36V, 220kHz to 2.2MHz, 2A/3A Fully Integrated Step-Down Converters with 15關A Operating Current
PDF  19 Pages
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Fabricante Electrónico  MAXIM [Maxim Integrated Products]
Página de inicio  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX20002CATPC Datasheet(HTML) 16 Page - Maxim Integrated Products

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A dominant pole (fdpEA) is set by the compensation capac-
itor (CC) and the amplifier output resistance (ROUT_EA). A
zero (fZEA) is set by the compensation resistor (RC) and
the compensation capacitor (CC). There is an optional
pole (fPEA) set by CF and RC to cancel the output capaci-
tor ESR zero if it occurs near the crossover frequency (fC,
where the loop gain equals 1 (0dB)). Thus:
zEA
CC
1
f
2C
R
=
π×
×
pdEA
C
OUT,EA
C
1
f
2
C
(R
R )
=
π×
×
+
pEA
F
C
1
f
2C
R
=
π×
×
The loop-gain crossover frequency (fC) should be set
below 1/5 of the switching frequency and much higher
than the power-modulator pole (fpMOD)
SW
pMOD
C
f
ff
5
<<
≤
The total loop gain as the product of the modulator gain,
the feedback voltage divider gain, and the error amplifier
gain at fC should be equal to 1. So:
FB
MOD(fC)
EA(fC)
OUT
V
GAIN
GAIN
1
V
××
=
For the case where fzMOD is greater than fC:
EA(fC)
m,EA
C
GAIN
g
R
=
×
Therefore:
FB
MOD(fC)
m,EA
C
OUT
V
GAIN
g
R
1
V
×
×
×=
Solving for RC:
OUT
C
m,EA
FB
MOD(fC)
V
R
g
V
GAIN
=
××
Set the error-amplifier compensation zero formed by RC
and CC (fzEA) at the fpMOD. Calculate the value of CC a
follows:
C
pMOD
C
1
C
2f
R
=
π×
×
If fzMOD is less than 5 x fC, add a second capacitor (CF)
from COMP to GND and set the compensation pole
formed by RC and CF (fpEA) at the fzMOD. Calculate the
value of CF as follows:
F
zMOD
C
1
C
2f
R
=
π×
×
As the load current decreases, the modulator pole
also decreases; however, the modulator gain increases
accordingly and the crossover frequency remains the
same. For the case where fzMOD is less than fC:
The power-modulator gain at fC is:
pMOD
MOD(fC)
MOD(dc)
zMOD
f
GAIN
GAIN
f
=
×
The error-amplifier gain at fC is:
zMOD
EA(fC)
m,EA
C
C
f
GAIN
g
R
f
=
××
Therefore:
zMOD
FB
MOD(fC)
m,EA
C
OUT
C
f
V
GAIN
g
R
1
V
f
×
×
××
=
Solving for RC:
OUT
C
C
m,EA
FB
MOD(fC)
zMOD
Vf
R
g
V
GAIN
f
×
=
××
×
Set the error-amplifier compensation zero formed by RC
and CC at the fpMOD (fzEA = fpMOD).
C
pMOD
C
1
C
2f
R
=
π×
×
If fzMOD is less than 5 × fC, add a second capacitor CF
from COMP to ground. Set fpEA = fzMOD and calculate
CF as follows:
F
zMOD
C
1
C
2f
R
=
π×
×
www.maximintegrated.com
Maxim Integrated │ 16
MAX20002/MAX20003
36V, 220kHz to 2.2MHz, 2A/3A Fully
Integrated Step-Down Converters
with 15μA Operating Current



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