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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： | 13/33页 |
| 文件大小： | 690K |
| 代理商： | IR3622AMTRPBF |
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IR3622AMPbF
www.irf.com
20
Power MOSFET Selection
The IR3622A uses two N-Channel MOSFETs per
channel. The selection criteria to meet power
transfer requirements are 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 gate threshold voltage (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, IRF6622 is selected for control
FET and IRF6629 is selected for synchronous
FET. These devices provide low on resistance in
a compact Direct FET package.
The MOSFETs have the following data:
The conduction losses will be: P
con=1.1W/Phase
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
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
3
.
6
R
V
10
nC
7
.
18
V,Q
25
V
:
(IRF6622)
ControlFET
gs
ds(on)
gs
g
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
figure18.
From IRF6622 data sheet:
tr = 13ns
tf = 14ns
These values are taken under a certain condition
test. For more details please refer to the IRF6622
data sheet.
By using equation (13A), we can calculate the
switching losses. P
sw=2.8W
The reverse recovery loss is also another
contributing factor in control FET switching
losses. This is equivalent to extra current
requires to remove the minority charges from
synchronous FET. The reverse recovery loss can
be expressed as:
(13A)
-
I
T
t
2
V
P
load
f
r
off
ds
sw
*
)
(
+
=
VDS
VGS
10%
90%
td(ON)
td(OFF)
tr
tf
Fig. 18: switching time waveforms
V
10
V
m
1
2
R
V
10
nC
51
V,Q
25
V
:
(IRF6629)
SyncFET
gs
ds(on)
gs
g
ds
=
@
.
@
Frequency
Switching
F
Time
Recovery
Reverse
t
Charge
Recovery
verse
Q
F
t
Q
P
s
rr
s
rr
Qrr
:
Re
:
*
=
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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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