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參數(shù)資料
| 型號： | IR3623MPBF |
| 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)： | 17/26頁 |
| 文件大?。?/td> | 523K |
| 代理商： | IR3623MPBF |
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IR3623MPbF
www.irf.com
Application Information
Design Example:
The following example is a typical application for
IR3623. The application circuit is shown in
page24.
Output Voltage Programming
Output voltage is programmed by reference
voltage and external voltage divider. The Fb pin
is the inverting input of the error amplifier, which
is internally referenced to 0.8V. The divider is
ratioed to provide 0.8V at the Fb pin when the
output is at its desired value. The output voltage
is defined by using the following equation:
When an external resistor divider is connected to
the output as shown in figure 17.
Equation (8) can be rewritten as:
For the calculated values of R
5
and R
6
see
feedback compensation section.
kHz
600
F
mV
30
V
A
40
≤
I
V
8
1
V
V
2
13
V
12
.
V
s
o
=
o
o
in
=
=
=
max)
,
.
(
)
8
(
-
-
R
R
1
V
V
5
6
REF
o
+
=
Fig. 17: Typical application of the IR3623 for
programming the output voltage
)
9
(
V
V
V
R
R
ref
o
ref
6
5
=
Soft-Start Programming
The soft-start timing can be programmed by
selecting the soft-start capacitance value. The
start-up time of the converter can be calculated
by using:
T
A
20
C
SS
*
μ
Where T
start
is the desired start-up time (ms)
For a start-up time of 5ms, the soft-start
capacitor will be 0.1uF. Choose a ceramic
capacitor at 0.1uF.
Input Capacitor Selection
The 180
o
out of phase will reduce the RMS value
of the ripple current seen by input capacitors.
This reduces numbers of input capacitors. The
input capacitors must be selected that can
handle both the maximum ripple RMS at highest
ambient temperature as well as the maximum
input voltage. The RMS value of current ripple for
duty cycle under 50% is expressed by:
Where:
-I
RMS
is the RMS value of the input capacitor
current
-D
1
and D
2
are the duty cycle for each channel
-I
1
and I
2
are the output current for each channel
For Io=40A and D=0.13, the I
RMS
= 17.8A.
Ceramic capacitors are recommended due to
their peak current capabilities, they also feature
low ESR and ESL at higher frequency which
enhance better efficiency,
Use 15x22uF, 16V ceramic capacitor from TDK
(C3225X5R1C226M).
For the single output application when the duty
cycle is larger than 50% the following equation
can be used to calculate the total RMS value
input capacitor current:
)
10
(
start
17
Fb1
IR3623
V
OUT
R
5
R
6
(
)
(
)
(
)
)
11
(
D
1
D
I
D
1
D
I
D
1
D
I
I
2
2
1
2
2
2
2
1
1
2
1
RMS
+
=
(
) (
+
)
(
)
0.5
D
D
2
2
D
1
D
2
I
I
O
RMS
>
=
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相關(guān)代理商/技術(shù)參數(shù) |
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| 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 |
| IR3623MTRPBF | 功能描述:開關(guān)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(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 |
| IR3624MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 10-MLPD 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 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) |
| IR3624MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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 |
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