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| 型号： | IR3622AMTRPbF |
| 厂商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| 中文描述： | 高频2相，单或双输出同步降压控制器，输出跟踪和排序 |
| 文件页数： | 11/33页 |
| 文件大小： | 690K |
| 代理商： | IR3622AMTRPBF |
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IR3622AMPbF
www.irf.com
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
Low inductor value results in large ripple current,
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
current
can
be
determined using the following relation:
Where:
For 2-phase single output application the inductor
ripple current is chosen between 20-50% of
maximum phase current
If
, then the output inductor will be:
L = 0.41uH
The Coilcraft MLC1260-401ML (L
1=0.4uH, 20A,
R
L1=0.93mOhm) is a low profile inductor suitable
for this application.
Use the following equation to calculate C
1 and R1
for current sensing:
(refer to figure 6 on page 12)
This results to C
1=1uF and R1=0.432K
s
o
in
F
1
D
t
i
L
V
=
=
;
)
( i
()
)
12
(
-
F
i
V
L
s
in
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
=
Output Capacitor Selection
The voltage ripple and transient requirements
determine the output capacitors types and
values. The criteria is normally based on the
value of the Equivalent Series Resistance (ESR).
However the actual capacitance value and the
Equivalent Series Inductance (ESL) are other
contributing factors. The overall output voltage
ripple can be expressed as:
Therefore it is recommended to select output
capacitor with low enough ESR to meet output
ripple and step load transient requirements.
The output ripple is highest at maximum input
voltage since
increases with input voltage.
Special Polymer capacitors offers low ESR with
large storage capacity per unit volume. These
capacitors offer a cost effective output capacitor
solution and are ideal choice when combined
with a controller having high loop bandwidth.
The IR3622A can perform well with all types of
capacitors.
Panasonic EEFSXOD221R (SP, 220F, 2V,
9mOhm) is selected for this design.
Equation (13) can be used to calculate the
required ESR for the specific voltage ripple.
Four SP capacitors would meet the voltage ripple
requirement.
)
%(
o
I
50
i
≈
19
current
ripple
Inductor
I
ripple
voltage
Output
V
F
C
8
I
V
ESL
L
V
-(13)
-
ESR
I
V
:
where
V
L
o
s
o
L
C
o
in
ESL
o
L
ESR
o
C
o
ESL
o
ESR
o
=
=
+
=
*
)
(
)
(
)
(
)
(
)
(
)
(
1
L
1
R
L
C
R
=
*
i
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3622MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3622MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ 2-PHASE Single or Dual SYNCH 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 |
| IR3623MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3623MPBF_1 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| IR3623MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ 2-PHASE Single or Dual SYNCH 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 |
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