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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： | 13/21页 |
| 文件大小： | 803K |
| 代理商： | IR3624MPBF |
IR3624MPBF
Power MOSFET Selection
The IR3624 uses two N-Channel MOSFETs. The
selections criteria to meet power transfer
requirements is based on maximum drain-source
voltage (V
DSS
), gate-source drive voltage (V
gs
),
maximum output current, On-resistance R
DS(on)
and thermal management.
The MOSFET must have a maximum operating
voltage (V
DSS
) exceeding the maximum input
voltage (V
in
).
The gate drive requirement is almost the same
for both MOSFETs. Logic-level transistor can be
used and caution should be taken with devices at
very low V
gs
to prevent undesired turn-on of the
complementary MOSFET, which results a shoot-
through current.
The total power dissipation for MOSFETs
includes conduction and switching losses. For
the Buck converter the average inductor current
is equal to the DC load current. The conduction
loss is defined as:
The R
DS(on)
temperature dependency should be
considered for the worst case operation. This is
typically given in the MOSFET data sheet.
Ensure that the conduction losses and switching
losses do not exceed the package ratings or
violate the overall thermal budget.
For this design, IRF8910 is a good choice. The
device provides two N-MOSFETs in a compact
SO-8 package.
The IRF8910 has the following data:
The conduction losses will be:
P
con
=0.724W
The switching loss is more difficult to calculate,
even though the switching transition is well
understood. The reason is the effect of the
parasitic components and switching times during
the switching procedures such as turn-on / turn-
off delays and rise and fall times. The control
MOSFET contributes to the majority of the
dependency
e
temperatur
ds(on)
R
D)
(1
R
I
switch)
(lower
P
D
R
I
switch)
(upper
P
ds(on)
2
load
cond
=
ds(on)
2
load
cond
=
=
=
=
V
10
V
m
4
.
13
R
A
@
10
I
,
V
20
=
)
V
gs
on
ds
d
ds
=
=
=
(
switching losses in synchronous Buck converter.
The synchronous MOSFET turns on under zero
voltage conditions, therefore, the turn on losses
for synchronous MOSFET can be neglected.
With a linear approximation, the total switching
loss can be expressed as:
Where:
V
ds(off)
= Drain to source voltage at the off time
t
r
= Rise time
t
f
= Fall time
T = Switching period
I
load
= Load current
The switching time waveforms is shown in
figure12.
From IRF8910 data sheet:
tr = 10ns
tf = 4.1ns
These values are taken under a certain condition
test. For more details please refer to the IRF8910
data sheet.
By using equation (10), we can calculate the
switching losses.
P
sw
=0.37W
(10)
-
I
T
t
t
2
V
P
load
f
r
off
ds
sw
*
*
)
(
+
=
V
DS
90%
V
GS
10%
t
d
(ON)
t
d
(OFF)
t
r
t
f
Fig. 12: switching time waveforms
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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