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參數(shù)資料
| 型號： | IR3638SPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS |
| 中文描述： | 高頻同步PWM降壓控制器進行跟蹤APPLIACTIONS |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 300K |
| 代理商： | IR3638SPBF |
IR3638SP
b
F
3/19/07
13
For this design we have:
V
in
=5V
V
o
=1.2V
V
osc
=1.25V
V
p
=1.0V
g
m
=450umoh
L
o
=1.0uH
C
o
=1x470uF, ESR=10mOhm
F
s
=400kHz
These result to:
F
LC
=7.3kHz
F
ESR
=33.8kHz
F
s/2
=200kHz
Select crossover frequency:
Fo=40kHz
Since:
F
<F
<F
<F
, typeII compensation is
selected to place the poles and zeros.
Using equations 12, 13 and 15 will result to the
following compensation values:
K
2
.
16
R
Select
,
K
76
.
16
R
(13)
-
g
R
F
V
R
R
*
F
F
V
R
3
3
m
2
2
LC
in
2
1
ESR
*
o
*
osc
3
)
(
*
*
=
=
+
=
nF
8
.
1
C
Select
nF
78
.
1
C
(12)
-
C
R
2
1
F
4
4
4
3
z
*
*
=
=
=
π
pF
22
C
Select
,
pF
49
C
(15)
-
F
R
*
1
C
POLE
POLE
s
3
POLE
≤
=
*
π
Layout Consideration
The layout is very important when designing high
frequency switching converters. Layout will affect
noise pickup and can cause a good design to
perform with less than expected results.
Start to place the power components, make all
the connection in the top layer with wide, copper
filled areas.
The inductor, output capacitor and the MOSFET
should be close to each other as possible. This
helps to reduce the EMI radiated by the power
traces due to the high switching currents through
them. Place input capacitor directly to the drain of
the high-side MOSFET, to reduce the ESR
replace the single input capacitor with two
parallel units.
The feedback part of the system should be kept
away from the inductor and other noise sources.
The critical bypass components such as
capacitors for Vcc and Vc should be close to
respective pins. It is important to place the
feedback components include feedback resistors
and compensation components close to Fb and
Comp pins.
In multilayer PCB use one layer as power ground
plane and have a control circuit ground (analog
ground), to which all signals are referenced. The
goal is to localize the high current path to a
separate loop that does not interfere with the
more sensitive analog control function. These two
grounds must be connected together on the PC
board layout at a single point.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR3638STRPBF | 功能描述:電壓模式 PWM 控制器 HI FREQ SYNC PWM 400kHz 0.6V Track RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3640MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 20-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| IR3640MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ SYNC PWM 4.5 to 5.5V 1.5MHz RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3651 | 制造商:IRF 制造商全稱:International Rectifier 功能描述: |
| IR3651SPBF | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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