APU3048 查看數據表（PDF） - Advanced Power Electronics Corp
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APU3048 Datasheet PDF : 17 Pages
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APU3048
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
12V
C1
1uF
C8
1uF
VcH1
Vcc
VcH2
HDrv1
3.3V
C9
47uF
2.5V @ 2A
C14
1uF
R2
Q1 10V
AP20T03GH
R5
1K
C15
R7
47uF
1K
VOUT3
LDrv1
PGnd
Fb3
U1 Fb1
APU3048
C18
1800pF
R9
43.2K
Comp1
HDrv2
C19
3900pF
R11
16.2K
C24
0.1uF
Comp2
SS
Gnd
LDrv2
Fb2
C2
33uF
L1
1uH
D1
BAT54S
C3
0.1uF
C6
Q2
47uF
AP9408AGH
C7
1uF
L3
1N4148
Q3
AP9412AGH
10uH
C10
470pF
R4
4.7V
C11, C12
2x 150uF
R6
1.65K
C16
C17
47uF
1uF
Q2
AP9408AGH
L4
1N4148
Q3
AP9412AGH
6.8uH
C20
470pF
R13
4.7V
R8
1K
C21, C22
2x 150uF
R14
442V
R15
1K
3.3V @ 4A
C13
1uF
1.8V @ 4A
C23
1uF
Figure 8 - Typical application of APU3048 in an on-board DC-DC converter
using a single 12V supply for switcher.
11
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