APW7062B View Datasheet(PDF) - Anpec Electronics
Part Name
Description
MFG CO.
'APW7062B' PDF : 18 Pages View PDF
APW7062B
Application Information (Cont.)
Note that both MOSFETs have conduction losses while
the upper MOSFET include an additional transition
loss.The switching internal, tsw, is a function of the
reverse transfer capacitance CRSS. Figure 3 illustrates
the switching waveform internal of the MOSFET.
The (1+TC) term is to factor in the temperature depen-
dency of the RDS(ON) and can be extracted from the
“RDS(ON) vs Temperature” curve of the power MOSFET.
Layout Considerations
In high power switching regulator, a correct layout is
important to ensure proper operation of the regulator.
In general, interconnecting impedances should be mini-
mized by using short, wide printed circuit traces. Sig-
nal and power grounds are to be kept separate and
finally combined using ground plane construction or
single point grounding. Figure 4 illustrates the layout,
with bold lines indicating high current paths. Compo-
nents along the bold lines should be placed close
together. Below is a checklist for your layout:
• Keep the switching nodes (UGATE, LGATE and
PHASE) away from sensitive small signal nodes
since these nodes are fast moving signals. There
fore keep traces to these nodes as short as
possible.
• The ground return of CIN must return to the combine
COUT (-) terminal.
• Capacitor CBOOT should be connected as close to
the BOOT and PHASE pins as possible.
V DS
t sw
Tim e
Figure 3. Switching waveform across MOSFET
VIN
APW 7062B
11
PGND
LGATE 12
U
1UGATE
9
PHASE 8
C IN
+
L
O
C OUT
A
Q1
Q2
D
+
L1
VO U T
Figure 4. Rec om m ended Layout Diagram
Copyright ANPEC Electronics Corp.
14
Rev. A.3 - Mar., 2005
www.anpec.com.tw
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