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参数资料
| 型号： | IR3629 |
| 厂商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| 中文描述： | 高频同步PWM降压控制器与电源良好输出 |
| 文件页数： | 4/23页 |
| 文件大小： | 598K |
| 代理商： | IR3629 |
IR3629/IR3629A MPbF
11/26/2007
Input Capacitor Selection
The ripple current generated during the on time
of upper the MOSFET should be provided by the
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=10A and D=0.125, the I
RMS=3.3A.
Ceramic capacitors are recommended due to
their peak current capabilities, they also feature
low ESR and ESL at higher frequency which
enables better efficiency.
Use 4x22uF, 16V ceramic capacitors from
Panasonic.
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
A 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 the inductor
value can be reduced to the desired maximum
ripple current in the inductor
. The optimum
point is usually found between 20% and 50%
ripple of the output current.
For the buck converter, the inductor value for the
desired
operating
ripple
current
can
be
determined using the following relation:
Where:
)
7
--(
D
1
D
I
o
RMS
)
(
=
in
o
V
D
=
s
o
in
F
1
D
t
i
L
V
=
=
Δ
;
)
( i
Δ
()
)
8
--(
F
i
V
L
s
in
o
in
*
Δ
=
cycle
Duty
D
time
on
Turn
t
frequency
Switching
F
current
ripple
Inductor
i
Voltage
Output
V
voltage
input
Maximum
V
s
o
in
=
Δ
If
, then the output inductor will be:
L = 0.6uH
The MPL104-0R6 from Delta provides a
compact, low profile inductor suitable for this
application.
Output Capacitor Selection
The voltage ripple and transient requirements
determine the output capacitors type and values.
The criteria is normally based on the value of the
Effective Series Resistance (ESR). However the
actual capacitance value and the Equivalent
Series Inductance (ESL) are other contributing
components.
These
components
can
be
described as:
Since the output capacitor has a major role in the
overall performance of the converter and
determines the result of transient response,
selection of the capacitor is critical. The IR3629
can perform well with all types of capacitor.
As a rule, the capacitor must have low enough
ESR to meet output ripple and load transient
requirements.
The goal for this design is to meet the voltage
ripple requirement in the smallest possible
capacitor size. Therefore a ceramic capacitor is
selected due to low ESR and small size. Five of
the Panasonic ECJ2FB0J226M (22uF, 6.3V, X5R
and EIA 0805 case size) is a good choice.
In the case of tantalum or low ESR electrolytic
capacitors, the ESR dominates the output
voltage ripple, equation (9) can be used to
calculate the required ESR for the specific
voltage ripple.
)
%(
o
I
i 37
≈
Δ
current
ripple
Inductor
I
ripple
voltage
Output
V
F
C
8
I
V
ESL
L
V
-(9)
-
ESR
I
V
L
o
s
o
L
C
o
in
ESL
o
L
ESR
o
C
o
ESL
o
ESR
o
=
=
+
=
Δ
*
)
(
)
(
)
(
)
(
)
(
)
(
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3629A | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| IR3629MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| IR3629MTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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