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參數(shù)資料
| 型號(hào)： | ISL6253 |
| 廠商： | Intersil Corporation |
| 英文描述： | Highly Integrated Battery Charger for Notebook Computers |
| 中文描述： | 高度集成的電池充電器用于筆記本電腦 |
| 文件頁(yè)數(shù)： | 18/22頁(yè) |
| 文件大?。?/td> | 549K |
| 代理商： | ISL6253 |
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18
PWM Comparator Gain F
m
The PWM comparator gain Fm for peak current mode
control is given by:
where V
PWM
is the peak-peak voltage of the PWM ramp
signal.
Current Sampling Transfer Function H
e
(S)
In current loop, the current signal is sampled every switching
cycle. It has the following transfer function:
where Q
n
and
ω
n
are given by
respectively
.
,
Power Stage Transfer Functions
Transfer function F
1
(S) from control to output voltage is:
2
o
p
Where
Transfer function F
2
(S) from control to inductor current is,
2
o
p
Current loop gain T
i
(S) is expressed as the following
equation:
where R
T
is the trans-resistance in current loop. R
T
is
usually equal to the product of the current sensing resistance
of the current amplifier. For ISL6253, R
T
= 24R
1
.
The voltage gain with open current loop is:
where
, V
FB
is the feedback voltage of the voltage
error amplifier.
The Voltage loop gain with current loop closed is given by:
If T
i
(S)>>1, then the above equation can be simplified as
follows:
Where RTV is the trans-resistance due to the current
information fed into the voltage loop. From the above
equation, it is shown that the system is a single order
system, which has a single pole located at
half switching frequency. Therefore, a simple type II
compensator can be easily used to stabilize the system.
before the
Figure 20 shows the type II compensator, and its transfer
function is expressed as follows:
F
m
v
comp
V
PWM
-----------------
=
=
(EQ. 18)
H
e
S
( )
2
------
ω
n
2
n
n
--------------
1
+
+
=
(EQ. 19)
Q
n
2
π
--
–
=
ω
n
π
f
s
=
,
F
1
S
( )
v
o
d
--
V
in
1
-----------
+
ω
o
------
--------------
1
+
+
--------------------------------------
=
=
(EQ. 20)
ω
esr
R
c
C
o
--------------
=
Q
p
R
o
C
o
L
------
ω
o
LC
o
--------------
=
,
≈
,
F
2
S
( )
i
o
d
-
V
o
R
L
---------+
1
------
+
ω
o
------
--------------
1
+
+
--------------------------------------
where
=
=
ω
z
o
o
--------------
≈
(EQ. 21)
T
i
S
( )
R
T
F
m
F
2
=
S
( )
H
e
S
( )
(EQ. 22)
T
v
S
( )
KF
m
F
1
S
V
V
o
( )
A
v
S
( )
=
(EQ. 23)
K
----------
=
L
v
S
( )
T
S
T
i
S
+
1
-----------------------
=
(EQ. 24)
L
v
S
( )
V
o
----------
R
R
L
+
TV
--------------------
1
---------------------
A
S
p
-----------
+
1
------
+
( )
e
S
----------------
ω
p
o
o
--------------
≈
,
=
(EQ. 25)
p
ω
FIGURE 19. SMALL SIGNAL MODEL OF SYNCHRONOUS
BUCK REGULATOR
i
in
1:D
-Av(S)
He(S)
^
v
in
^
I
L
d
d
Fm
+
V
comp
^
T
v
(S)
K
T
i
(S)
+
i
L
^
L
R
T
Rc
Ro
Co
V
o
^
V
in
d^
+
-
+
R1
C1
V
REF
V
FB
Vo
g
m
V
COMP
C2
FIGURE 20. TYPE II COMPENSATOR
ISL6253
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6253HAZ | Highly Integrated Battery Charger for Notebook Computers |
| ISL6253HRZ | Highly Integrated Battery Charger for Notebook Computers |
| ISL6269A | High-Performance Notebook PWM Controller(高性能筆記本PWM控制器) |
| ISL6271ACRZ | Integrated XScale Regulator |
| ISL6271ACRZ-T | Integrated XScale Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6253EVAL1 | 功能描述:EVALUATION BOARD 1 ISL6253 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ISL6253EVAL1Z | 功能描述:EVALUATION BOARD 1 ISL6253 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:* 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| ISL6253HA | 制造商:Intersil Corporation 功能描述:NOTEBOOK BATTERY CHARGER, -10 TO +100, 28LD SSOP - Rail/Tube |
| ISL6253HA-T | 制造商:Intersil Corporation 功能描述:NOTEBOOK BATTERY CHARGER, -10 TO +100, 28LD SSOP, T&R - Tape and Reel |
| ISL6253HAZ | 功能描述:IC CTRLR BATTERY CHARGER 28QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:Impedance Track™ 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁(yè)面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
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