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MAX1908 Arkusz danych(PDF) 24 Page - Maxim Integrated Products

Numer części MAX1908
Szczegółowy opis  Low-Cost Multichemistry Battery Chargers
PDF  30 Pages
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Producent  MAXIM [Maxim Integrated Products]
Strona internetowa  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1908 Arkusz danych(HTML) 24 Page - Maxim Integrated Products

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Low-Cost Multichemistry Battery Chargers
24
______________________________________________________________________________________
The crossover frequency is given by:
The CCI loop dominant compensation pole:
where the GMI amplifier output impedance, ROGMI =
10M
Ω.
To calculate the CCI loop compensation pole, CCI:
GMI = 1µA/mV
GMOUT = 3.33A/V
ROGMI = 10MΩ
f = 400kHz
Choose crossover frequency fCO_CI to be 1/5th the
MAX1908/MAX8724/MAX8765/MAX8765A switching
frequency:
Solving for CCI, CCI = 2nF.
To be conservative, set CCI = 10nF, which sets the
crossover frequency at:
The compensation pole, fP_CI is set at:
CCS Loop Definitions
Compensation of the CCS loop depends on the parame-
ters and components shown in Figure 9. CCS is the CCS
loop compensation capacitor. ACSS is the internal gain of
the current-sense amplifier. RS1 is the input current-
sense resistor, RS1 = 10m
Ω. ROGMS is the equivalent
output impedance of the GMS amplifier
≥ 10MΩ. GMS is
f
GMI
RC
Hz
PCI
OGMI
CI
_
.
=
×
=
2
0 0016
π
f
GMI
nF
kHz
CO CI
_
==
210
16
π
f
GMI
C
kHz
CO CI
CI
_
==
2
80
π
f
RC
PCI
OGMI
CI
_
=
×
1
2
π
f
GMI
C
CO CI
CI
_
=
2
π
GMOUT
CCI
GMI
ICTL
CCI
ROGMI
CSIP
CSIN
CSI
RS2
Figure 7. CCI Loop Diagram
CCI LOOP GAIN
vs. FREQUENCY
FREQUENCY (Hz)
100k
10k
1
10
100
1k
-40
-20
0
20
40
60
80
100
-60
0.1
1M
CCI LOOP PHASE
vs. FREQUENCY
FREQUENCY (Hz)
100k
10k
1k
100
10
1
-90
-75
-60
-45
-30
-15
0
-105
0.1
1M



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