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參數(shù)資料
| 型號： | MAX1909 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Multichemistry Battery Charger with Automatic System Power Selector |
| 中文描述： | 多種化學(xué)類型電池充電器，自動選擇系統(tǒng)電源 |
| 文件頁數(shù)： | 22/29頁 |
| 文件大?。?/td> | 551K |
| 代理商： | MAX1909 |
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M
Multichemistry Battery Charger with Automatic
System Power Selector
22
______________________________________________________________________________________
Setting the LTF = 1 to solve for the unity gain frequency
yields:
For stability, choose a crossover frequency lower than
1/10th of the switching frequency. Choosing a
crossover frequency of 30kHz and solving for R
CV
using the component values listed in Figure 1 yields:
MODE = V
CC
(4 cells)
GMV = 0.125μA/mV
C
OUT
= 22μF
V
BATT
= 16.8V
R
L
= 0.2
GM
OUT
= 3.33A/V
f
CO_CV
= 30kHz
f
OSC
= 400kHz
To ensure that the compensation zero adequately can-
cels the output pole, select f
Z_CV
≤
f
P_OUT
:
C
CV
≥
(R
L
/R
CV
) C
OUT
where C
CV
≥
4nF (assuming 4 cells and 4A maximum
charge current).
Figure 6 shows the Bode plot of the voltage-loop fre-
quency response using the values calculated above.
CCI Loop Compensation
The simplified schematic in Figure 7 is sufficient to
describe the operation of the MAX1909 when the bat-
tery current loop (CCI) is in control. Since the output
capacitor
’
s impedance has little effect on the response
of the current loop, only a single pole is required to
compensate this loop. A
CSI
is the internal gain of the
current-sense amplifier. RS2 is the charge current-
sense resistor, RS2 = 15m
. R
OGMI
is the equivalent
output impedance of the GMI amplifier, which is greater
than 10M
. GMI is the charge current amplifier
transconductance = 1μA/mV. GM
OUT
is the DC-to-DC
converter transconductance = 3.3A/V.
The loop transfer function is given by:
This describes a single pole system. Since:
the loop transfer function simplifies to:
LTF
GMI
R
sR
C
OGMI
OGMI
CI
=
+
×
1
GM
A
RS
OUT
CSI
=
×
1
2
LTF
GM
A
RS
GMI
R
sR
C
OUT
CSI
OGMI
OGMI
CI
=
×
×
×
+
×
2
1
R
C
f
GMV GM
k
CV
OUT
CO CV
_
OUT
=
×
×
=
2
10
π
f
CO CV
_
GM
GMV
R
×
C
OUT
CV
OUT
=
×
2
π
LTF
GM
R
sC
GMV
OUT
CV
OUT
=
×
FREQUENCY (Hz)
M
P
100k
10k
1k
100
10
1
-20
0
20
40
60
80
-40
-90
-45
0
-135
0.1
1M
MAG
PHASE
Figure 6. CCV Loop Response
C
CI
R
OGMI
CCI
GMI
CSI
ICTL
GM
OUT
CSIP
RS2
CSIN
Figure 7. CCI Loop Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1909ETI | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1909ETI+ | 功能描述:電池管理 Multichemistry Battery Chargers RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1909ETI+T | 功能描述:電池管理 Multichemistry Battery Chargers RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1909ETI-T | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1909EVKIT | 功能描述:電池管理 Evaluation Kit for the MAX1909 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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