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參數(shù)資料
| 型號(hào)： | 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(jìn)行跟蹤APPLIACTIONS |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大?。?/td> | 300K |
| 代理商： | IR3638SPBF |
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IR3638SP
b
F
3/19/07
Application Information
Design Example:
The following is a design of typical application for
IR3638. The application circuit is shown on page
14.
Output Voltage Programming
Output voltage is programmed by Vp voltage and
external voltage divider. The Fb pin is the
inverting input of the error amplifier, which is
externally referenced to Vp. The divider is set to
provide a voltage equal to Vp (in this case 1V)
when the output is at its desired value. The
output voltage is defined by using the following
equation:
R
1
V
V
p
o
When an external resistor divider is connected to
the output as shown in figure 8.
Equation (2) can be rewritten as:
Select R1 =1kOhm, this will result in R2=5kOhm.
Select the closest Standard value of 4.99kOhm.
mV
30
V
A
6
≤
I
Δ
V
2
1
V
V
.
1
V
V
12
V
V
V
5
V
o
o
o
p
c
cc
in
=
=
=
=
=
=
)
2
--(
R
2
1
+
=
Fig. 8: Typical application of the IR3638 for
programming the output voltage
)
3
--(
V
V
V
R
R
p
O
p
1
2
=
Soft-Start Programming
The soft-start timing can be programmed by
selecting the soft-start capacitance value. The
start-up time of the converter can be calculated
by using:
A
22
C
SS
μ
Where T
start
is the desired start-up time (ms)
For a start-up time of 5ms, the soft-start
capacitor will be 0.1uF. Choose a ceramic
capacitor at 0.1uF.
)
1
--(
T
start
*
9
Fb
IR3638
V
OUT
R
2
R
1
Input Capacitor Selection
The input filter capacitor should be selected
based on how much ripple the supply can
tolerate on the DC input line. The ripple current
generated during the on time of upper MOSFET
should be provided by input capacitor. The RMS
value of this ripple is expressed by:
Where:
D is the Duty Cycle
I
RMS
is the RMS value of the input capacitor
current.
Io is the output current.
For Io=6A and D=0.24, the I
RMS
=2.6A.
Ceramic capacitors are recommended due to
their peak current capabilities, they also feature
low ESR and ESL at higher frequency which
enhance better efficiency,
Use two 10uF, 16V ceramic capacitor from
Panasonic.
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
Low inductor value causes large ripple current,
resulting in the smaller size, faster response to a
load transient but poor efficiency and high output
noise. Generally, the selection of inductor value
can be reduced to desired maximum ripple
current in the inductor . The optimum point is
usually found between 20% and 50% ripple of
the output current.
)
4
--(
)
D
1
(
D
I
I
o
RMS
=
in
o
V
V
D
=
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| 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?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)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 |
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| IR3640MTRPBF | 功能描述:開(kāi)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(kāi)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(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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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