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參數(shù)資料
| 型號： | ISL6253HRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Highly Integrated Battery Charger for Notebook Computers |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC28 |
| 封裝： | 5 X 5 MM, LEAD-FREE, PLASTIC, MO-220VHHD-1, QFN-28 |
| 文件頁數(shù)： | 18/22頁 |
| 文件大?。?/td> | 549K |
| 代理商： | ISL6253HRZ |
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6253HRZ-T | 功能描述:電池管理 VER OF ISL6253HR-T 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 |
| ISL6255 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Highly Integrated Battery Charger with Automatic Power Source Selector for Notebook Computers |
| ISL6255_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Highly Integrated Battery Charger with Automatic Power Source Selector for Notebook Computers |
| ISL6255A | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Highly Integrated Battery Charger with Automatic Power Source Selector for Notebook Computers |
| ISL6255AHAZ | 功能描述:IC BATTERY CHARGER CTRLR 28-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
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