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參數(shù)資料
| 型號(hào)： | 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(dòng)選擇系統(tǒng)電源 |
| 文件頁(yè)數(shù)： | 23/29頁(yè) |
| 文件大?。?/td> | 551K |
| 代理商： | MAX1909 |
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M
Multichemistry Battery Charger with Automatic
System Power Selector
______________________________________________________________________________________
23
The crossover frequency is given by:
For stability, choose a crossover frequency lower than
1/10th of the switching frequency:
C
CI
= GMI / (2
π
f
O_CI
)
Choosing a crossover frequency of 30kHz and using
the component values listed in Figure 1 yields C
CI
>
5.4nF. Values for C
CI
greater than 10 times the mini-
mum value may slow down the current-loop response
excessively. Figure 8 shows the Bode plot of the cur-
rent-loop frequency response using the values calculat-
ed above.
CCS Loop Compensation
The simplified schematic in Figure 9 is sufficient to
describe the operation of the MAX1909 when the input
current-limit loop (CCS) is in control. Since the output
capacitor
’
s impedance has little effect on the response
of the input current-limit loop, only a single pole is
required to compensate this loop. A
CSS
is the internal
gain of the current-sense amplifier. RS1 is the input cur-
rent-sense resistor; RS1 = 10m
in the
Typical
Applications Circuits
. R
OGMS
is the equivalent output
impedance of the GMS amplifier, which is greater than
10M
. GMS is the charge-current amplifier transcon-
ductance = 1μA/mV. GM
IN
is the DC-to-DC converter
’
s
input-referred transconductance = (1/D) GM
OUT
=
(1/D) 3.3A/V.
The loop transfer function is given by:
Since:
the loop transfer function simplifies to:
The crossover frequency is given by:
For stability, choose a crossover frequency lower than
1/10th the switching frequency:
C
CS
= GMS / (2
π
f
CO_CS
)
Choosing a crossover frequency of 30kHz and using
the component values listed in Figure 1 yields C
CS
>
5.4nF. Values for C
CI
greater than 10 times the mini-
mum value may slow down the current-loop response
excessively. Figure 10 shows the Bode plot of the input
current-limit loop frequency response using the values
calculated above.
MOSFET Drivers
The DHI and DLO outputs are optimized for driving
moderately sized power MOSFETs. The MOSFET drive
f
GMS
C
CO CS
_
CS
=
2
π
LTF
GMS
R
sR
C
OGMS
OGMS
CS
=
+
×
1
GM
A
RS
IN
CSS
=
×
1
1
LTF
GM
A
RS
GMS
R
sR
C
IN
CSS
OGMS
OGMS
CS
=
×
×
×
+
×
1
1
f
GMI
C
CO CI
_
CI
=
2
π
FREQUENCY (Hz)
M
100k
10M
1k
10
-20
0
20
40
60
100
80
-40
-45
0
-90
0.1
MAG
PHASE
P
Figure 8. CCI Loop Response
C
CS
R
OGMS
GMS
CSS
CLS
CCS
CSSP
RS1
CSSN
GM
IN
SYSTEM
LOAD
ADAPTER
INPUT
Figure 9. CCS 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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