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參數(shù)資料
| 型號： | IR3622AMTRPbF |
| 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)： | 10/33頁 |
| 文件大?。?/td> | 690K |
| 代理商： | IR3622AMTRPBF |
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IR3622AMPbF
www.irf.com
Application Information
Design Example:
The following is a design of typical single output
current share application for IR3622A. The
application circuit is shown on page 26.
Output Voltage Programming
Output voltage is programmed by reference
voltage and external voltage divider. As shown in
figure 17 the Fb1 pin is the inverting input of the
error amplifier, which is internally referenced to
0.8V. The divider is set to provide 0.8V at the Fb
pin when the output is at its desired value. The
output voltage is defined by the following
equation:
Equation (8) can be rewritten as:
For the calculated values of R
5
and R
6 see
feedback compensation section.
kHz
375
F
mV
30
V
A
40
I
V
8
1
V
10
V
12
V
s
o
in
=
≤
=
±
=
.
%)
(
,
)
8
(
-
R
1
V
5
6
REF
o
+
=
Fig. 17: Typical application of the IR3622A for
programming the output voltage
)
9
(
-
V
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
using the following expression:
Where T
start is the desired start-up time (ms)
For a start-up time of 5ms, the soft-start
capacitor will be 0.15uF. Choose a ceramic
capacitor at 0.15uF.
Input Capacitor Selection
The 180o 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 able to handle both the
maximum ripple RMS current at the highest
ambient temperature, as well as the maximum
input voltage. The RMS value of current ripple for
a duty cycle under 50% is expressed by:
Where:
-I
RMS is the RMS value of the input capacitor
current
-D
1 and D2 are duty cycle for each channel
-I
1 and I2 are the output current for each channel
For Io=40A and D=0.16 (1.8V/10.8V),
the I
RMS= 9.43A.
Ceramic capacitors are recommended due to
their peak current capabilities. They also feature
low ESR and ESL at higher frequency, which
enhance circuit efficiency.
Use 10x22uF, 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 current
for the input capacitor current:
( )
)
10
(
-
ms
T
A
75
28
nF
C
start
SS
*
.
18
Fb1
IR3622A
VOUT
R5
R6
(
)
(
)
(
)
)
11
(
-
D
I
2
D
1
D
I
D
1
D
I
2
1
2
1
2
1
2
1
RMS
+
=
(
) (
)
(
)
0.5
D
2
D
1
D
2
I
O
RMS
>
+
=
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| 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(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) |
| 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 |
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