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参数资料
| 型号： | IR3624MPBF |
| 厂商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER |
| 中文描述： | 高频同步PWM降压控制器 |
| 文件页数： | 12/21页 |
| 文件大小： | 803K |
| 代理商： | IR3624MPBF |
IR3624MPBF
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=0.13, the I
RMS
=2.0A.
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 one 10uF, 25V 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.
For the buck converter, the inductor value for
desired
operating
ripple
determined using the following relation:
current
can
be
Where:
=
)
7
--(
)
D
1
(
D
I
I
o
RMS
=
in
o
V
V
D
=
s
o
in
F
1
D
t
t
i
L
V
V
=
=
;
(
)
)
8
--(
F
i
V
V
V
V
L
s
in
o
o
in
*
=
cycle
Duty
D
time
on
Turn
t
frequency
Switching
=
F
current
ripple
Inductor
i
Voltage
Output
V
voltage
input
Maximum
V
s
o
in
=
=
=
=
If , then the output inductor will be:
L = 0.82uH
The ACT STS703 series provides a range of
inductors in different values, low profile suitable
for large currents.
Output Capacitor Selection
The voltage ripple and transient requirements
determines the output capacitors types 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 major role in
overall performance of converter and determine
the result of transient response, selection of
capacitor is critical. The IR3624 can perform well
with all types of capacitors.
As a rule the capacitor must have low enough
ESR to meet output ripple and load transient
requirements, yet have high enough ESR to
satisfy stability requirements.
The goal for this design is to meet the voltage
ripple requirement in smallest possible capacitor
size. Therefore ceramic capacitor is selected due
to low ESR and small size. Two 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.
)
%(
50
≈
12
current
ripple
Inductor
I
ripple
voltage
Output
V
F
C
8
I
V
ESL
L
V
V
-(9)
-
ESR
I
V
V
V
V
V
L
o
s
o
L
C
o
in
ESL
o
L
ESR
o
C
o
ESL
o
ESR
o
o
=
=
=
=
=
+
+
=
*
*
*
*
)
(
)
(
)
(
)
(
)
(
)
(
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相关代理商/技术参数 |
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| IR3624MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3628MPBF | 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) |
| IR3628MTRPBF | 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 |
| IR3629 | 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 |
| 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 |
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