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參數(shù)資料
| 型號(hào)： | IR3638SPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS |
| 中文描述： | 高頻同步PWM降壓控制器進(jìn)行跟蹤APPLIACTIONS |
| 文件頁(yè)數(shù)： | 10/15頁(yè) |
| 文件大小： | 300K |
| 代理商： | IR3638SPBF |
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IR3638SP
b
F
3/19/07
s
o
in
F
1
D
t
t
i
L
V
V
=
=
Δ
Δ
Δ
;
(
)
)
5
--(
F
i
V
V
Δ
V
V
L
s
in
o
o
in
*
=
cycle
Duty
D
time
on
Turn
t
frequency
Switching
=
F
Δ
current
ripple
Inductor
i
Voltage
Output
V
Δ
voltage
input
Maximum
V
s
o
in
=
=
=
=
=
It is recommended to select output capacitor with
low enough ESR to meet output voltage ripple
and step load transient requirements.
PosCap capacitors offer low ESR with large
storage capacity per unit volume. These
capacitors offer a cost effective output capacitor
solution.
Sanyo 2R5TPF470M (2.5V, 470uF, 10mOhm) is
selected for this design.
Equation (6) can be used to calculate the
required ESR for the specific voltage ripple.
One Capacitor would meet the voltage ripple
requirement.
10
current
ripple
Inductor
I
ripple
voltage
Output
V
F
C
8
I
V
ESL
L
V
V
-(6)
-
ESR
I
V
V
V
V
V
L
o
s
o
L
C
o
in
ESL
o
L
ESR
o
C
o
ESL
o
ESR
o
o
=
=
=
=
=
+
+
=
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
Δ
*
*
*
*
)
(
)
(
)
(
)
(
)
(
)
(
Inductor Selection (Cont..)
For the buck converter, the inductor value for
desired
operating
ripple
determined using the following relation:
current
can
be
If , then the output inductor will be:
L = 0.95uH
The coilcraft
DO3316H-102ML (1uH, 10A,
6mOhm) is suitable for this application.
Output Capacitor Selection
The voltage ripple and transient requirements
determines the output capacitors types and
values. The criteria is normally based on the
value of the Effective Series Resistance (ESR).
However the actual capacitance value and the
Equivalent Series Inductance (ESL) are other
contributing components, these components can
be described as:
Power MOSFET Selection
The IR3638 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.
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
=
=
=
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR3638STRPBF | 功能描述:電壓模式 PWM 控制器 HI FREQ SYNC PWM 400kHz 0.6V Track RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3640MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 20-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| IR3640MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ SYNC PWM 4.5 to 5.5V 1.5MHz 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(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3651 | 制造商:IRF 制造商全稱:International Rectifier 功能描述: |
| IR3651SPBF | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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