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參數(shù)資料
| 型號： | MAX1909ETI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Multichemistry Battery Charger with Automatic System Power Selector |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, QCC28 |
| 封裝： | 5 X 5 MM, 0.80 MM HEIGHT, MO-220-WHHD-1, TQFN-28 |
| 文件頁數(shù)： | 21/29頁 |
| 文件大?。?/td> | 551K |
| 代理商： | MAX1909ETI |
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M
Multichemistry Battery Charger with Automatic
System Power Selector
______________________________________________________________________________________
21
The equivalent output impedance of the GMV amplifier,
R
OGMV
, is greater than 10M
. The voltage loop
transconductance (GMV = I
CCV
/V
BATT
) depends on the
MODE input, which determines the number of cells. GMV
= 0.125mA/mV for 4 cells and GMV = 0.167mA/mV for 3
cells. The DC-to-DC converter transconductance is
dependent upon the charge current-sense resistor RS2:
where A
CSI
= 20, and RS2 = 0.015
in the
Typical
Application Circuits
, so GM
OUT
= 3.33A/V.
The loop transfer function is:
The poles and zeros of the voltage-loop transfer func-
tion are listed from lowest frequency to highest frequen-
cy in Table 1.
Near crossover, C
CV
has a much lower impedance
than R
OGMV
. Since C
CV
is in parallel with R
OGMV,
C
CV
dominates the parallel impedance near crossover.
Additionally, R
CV
has a much higher impedance than
C
CV
and dominates the series combination of R
CV
and
C
CV
, so:
C
OUT
also has a much lower impedance than R
L
near
crossover, so the parallel impedance is mostly capaci-
tive and:
If R
ESR
is small enough, its associated output zero has
a negligible effect near crossover and the loop-transfer
function can be simplified as follows:
R
sC
R
sC
L
OUT
L
OUT
1
(
1
+
×
)
R
sC
R
×
R
sC
R
OGMV
(
CV
CV
)
CV
OGMV
CV
×
+
×
(
)
+
1
1
LTF
GM
R
sC
R
×
R
sC
R
sC
R
G
sC
R
OUT
OGMV
(
CV
CV
)
)
CV
OGMV
L
OUT
L
MV
OUT
ESR
=
×
×
+
×
(
)
+
(
×
+
×
(
)
+
×
1
1
1
1
GM
A
RS
OUT
CSI
=
×
1
2
C
CV
C
OUT
R
CV
R
L
R
ESR
R
OGMV
CCV
BATT
GMV
REF
GM
OUT
Figure 5. CCV Loop Diagram
NO.
NAME
CALCULATION
DESCRIPTION
1
CCV pole
Lowest frequency pole created by C
CV
and GMV
’
s finite output
resistance. Since R
OGMV
is very large and not well controlled, the
exact value for the pole frequency is also not well controlled
(R
OGMV
> 10M
).
Voltage-loop compensation zero. If this zero is at the same
frequency or lower than the output pole f
P_OUT
, then the loop
transfer function approximates a single pole response near the
crossover frequency. Choose C
CV
to place this zero at least one
decade below crossover to ensure adequate phase margin.
Output pole formed with the effective load resistance R
L
and the
output capacitance C
OUT
. R
L
influences the DC gain but does not
affect the stability of the system or the crossover frequency.
Output ESR Zero. This zero can keep the loop from crossing unity
gain if f
Z_OUT
is less than the desired crossover frequency;
therefore, choose a capacitor with an ESR zero greater than the
crossover frequency.
2
CCV zero
3
Output pole
4
Output zero
Table 1. Poles and Zeros of the Voltage-Loop Transfer Function
f
R
C
P CV
_
OGMV
CV
=
×
1
2
π
f
R
C
Z CV
_
CV
CV
=
×
1
2
π
f
R
C
P OUT
_
L
OUT
=
×
1
2
π
f
R
C
Z OUT
_
ESR
OUT
=
×
1
2
π
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| 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 |
| MAX190ACNG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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