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參數(shù)資料
| 型號(hào)： | IR3651STRPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH VOLTAGE SYNCHRONOUS PWM BUCK CONTROLLER |
| 中文描述： | 高壓同步PWM降壓控制器 |
| 文件頁(yè)數(shù)： | 14/19頁(yè) |
| 文件大?。?/td> | 397K |
| 代理商： | IR3651STRPBF |
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IR3651SP
b
F
10/11/2006
Power MOSFET Selection
The IR3651 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 in 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.
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
=
=
=
=
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
figure10.
-(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. 10: switching time waveforms
14
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