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參數(shù)資料
| 型號(hào)： | IRU3048CS |
| 廠商： | International Rectifier |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER |
| 中文描述： | 雙同步PWM控制器電路和LDO控制器 |
| 文件頁(yè)數(shù)： | 11/18頁(yè) |
| 文件大?。?/td> | 154K |
| 代理商： | IRU3048CS |
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IRU3048
11
Rev. 1.7
09/12/02
www.irf.com
Layout Consideration
The layout is very important when designing high fre-
quency switching converters. Layout will affect noise
pickup and can cause a good design to perform with
less than expected results.
Start to place the power components, make all the con-
nection in the top layer with wide, copper filled areas.
The inductor, output capacitor and the MOSFET should
be close to each other as possible. This helps to reduce
the EMI radiated by the power traces due to the high
switching currents through them. Place input capacitor
directly to the drain of the high-side MOSFET, to reduce
the ESR replace the single input capacitor with two par-
allel units. The feedback part of the system should be
kept away from the inductor and other noise sources,
and be placed close to the IC. In multilayer PCB use
one layer as power ground plane and have a control cir-
cuit ground (analog ground), to which all signals are ref-
erenced. The goal is to localize the high current path to
a separate loop that does not interfere with the more
sensitive analog control function. These two grounds
must be connected together on the PC board layout at a
single point.
TYPICAL APPLICATION
12V to 3.3V @ 4A
12V to 1.8V @ 4A
3.3V to 2.5V @ 2A
Figure 8 - Typical application of IRU3048 in an on-board DC-DC converter
using a single 12V supply for switcher.
12V
2.5V @ 2A
C9
47uF
R7
1K
1/2 of Q3
IRF7313
L4
1/2 of Q3
IRF7313
C8
1uF
C15
47uF
3.3V
U1
3.3V @ 4A
R8
1K
C13
1uF
L3
C16
47uF
R6
1.65K
C24
0.1uF
R5
R11
C19
R9
C18
C1
1uF
PGnd
V
OUT3
LDrv1
HDrv1
Fb1
LDrv2
HDrv2
VcH1
VcH2
Vcc
Gnd
Comp2
Fb3
Comp1
SS
IRU3048
1/2 of Q2
IRF7313
1/2 of Q2
IRF7313
C6
47uF
C3
0.1uF
10uH
6.8uH
1.8V @ 4A
R15
1K
R14
442
Fb2
1K
Q1
IRLR2703
L1
1uH
C2
33uF
D1
BAT54S
C14
1uF
R2
10
C7
1uF
C17
1uF
C10
470pF
R4
4.7
C20
470pF
R13
4.7
C11, C12
2x 150uF
1800pF
3900pF
43.2K
16.2K
C21, C22
2x 150uF
C23
1uF
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