Diodes AP6503A - Manual (Page 12)

AP6503A
Document number: DS36000 Rev. 2 - 2
12 of 15
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December 2012
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AP6503A
Application Information
(cont.)
PC Board Layout
This is a high switching frequency converter. Hence attention must be paid to the switching currents interference in the layout. Switching current
from one power device to another can generate voltage transients across the impedances of the interconnecting bond wires and circuit traces.
These interconnecting impedances should be minimized by using wide, short printed circuit traces.
AP6503A is exposed at the bottom of the package and must be soldered directly to a well designed thermal pad on the PCB. This will help to
increase the power dissipation
External Bootstrap Diode
It is recommended that an external bootstrap diode be added when the input voltage is no greater than 5V or the 5V rail is available in the
system. This helps to improve the efficiency of the regulator. This solution is also applicable for D > 65%. The bootstrap diode can be a low cost
one such as BAT54 or a schottky that has a low V
F
.
Figure 7—External Bootstrap Compensation Components
Recommended Diodes:
Part Number
Voltage/Current
Rating
Vendor
B130 30V, 1A Diodes Inc
SK13 30V, 1A Diodes Inc
34mm
52mm
External feedback
resistor dividers
must be placed
close to the FB pin.
Input capacitor C1
must be placed as
close as possible
to the IC and to L1.