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MAX1908 Arkusz danych(PDF) 25 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) 25 Page - Maxim Integrated Products

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Low-Cost Multichemistry Battery Chargers
______________________________________________________________________________________
25
the charge-current amplifier transconductance = 1µA/mV.
GMIN is the DC-DC converter transconductance =
3.3A/V. The CCS loop is a single-pole system with a dom-
inant pole compensation set by fP_CS:
The loop transfer function is given by:
Since:
Then, the loop transfer function simplifies to:
The crossover frequency is given by:
The CCS loop dominant compensation pole:
where the GMS amplifier output impedance, ROGMS =
10M
Ω.
To calculate the CCI loop compensation pole, CCS:
GMS = 1µA/mV
GMIN = 3.33A/V
ROGMS = 10MΩ
f = 400kHz
f
RC
PCS
OGMS
CS
_
=
×
1
2
π
f
GMS
C
CO CS
CS
_
=
2
π
LTF
GMS
R
sR
C
OGMS
OGMS
CS
=×
+×
1
GM
ARS
IN
CSS
=
×
1
1
LTF
GM
A
RS
GMS
R
sR
C
IN
CSS
OGMS
OGMS
CS
=×
×
×
×
+×
1
1
f
RC
PCS
OGMS
CS
_
=
×
1
2
π
GMIN
CCS
GMS
CLS
CCS
ROGMS
CSSP
CSSN
CSS
RS1
Figure 9. CCS Loop Diagram
CCS LOOP GAIN
vs. FREQUENCY
FREQUENCY (Hz)
100k
10k
1
10
100
1k
-40
-20
0
20
40
60
80
100
-60
0.1
1M
CCS LOOP PHASE
vs. FREQUENCY
FREQUENCY (Hz)
100k
10k
1k
100
10
1
-90
-75
-60
-45
-30
-15
0
-105
0.1
1M
Figure 10. CCS Loop Gain/Phase vs. Frequency



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