- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377500 > IR3622AMPBF (International Rectifier) HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING PDF資料下載
參數(shù)資料
| 型號： | IR3622AMPBF |
| 廠商： | 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： | 高頻2相，單或雙輸出同步降壓控制器，輸出跟蹤和排序 |
| 文件頁數(shù)： | 20/33頁 |
| 文件大?。?/td> | 690K |
| 代理商： | IR3622AMPBF |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁
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
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
complementary
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
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
3
=
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
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. 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
rr
s
rr
rr
Qrr
Re
:
*
*
相關PDF資料 |
PDF描述 |
|---|---|
| IR3622MPBF | HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| IR3637STRPBF | 1% ACCURATE SYNCHRONOUS PWM CONTROLLER |
| IR3637SPBF | 1% ACCURATE SYNCHRONOUS PWM CONTROLLER |
| IR3638SPBF | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS |
| IR3651SPBF | HIGH VOLTAGE SYNCHRONOUS PWM BUCK CONTROLLER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| IR3622AMTRPBF | 功能描述:開關變換器、穩(wěn)壓器與控制器 2 CH OR 2 PHASE SYNC PWM CNTRLR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3622MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| IR3622MTRPBF | 功能描述:開關變換器、穩(wěn)壓器與控制器 HI FREQ 2-PHASE Single or Dual SYNCH RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3623MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| IR3623MPBF_1 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
發(fā)布緊急采購，3分鐘左右您將得到回復。