NCP3102C
http://onsemi.com
22
tss
t
1.0V
3.3V
Output
Current
Output
Voltage
Figure 34. Voltage Enable Load Current
If the inrush current is higher than the steady state input
current during max load, then an input fuse should be rated
accordingly using I
2
t methodology.
Layout Considerations
When designing a high frequency switching converter,
layout is very important. Using a good layout can solve
many problems associated with these types of power
supplies as transients occur.
External compensation components (R1, C9) are needed
for converter stability. They should be placed close to the
NCP3102C. The feedback trace is recommended to be kept
as far from the inductor and noisy power traces as possible.
The resistor divider and feedback acceleration circuit (R2,
R3, R6, C13) are recommended to be placed near output
feedback (Pin 16, NCP3102C).
Switching current from one power device to another can
generate voltage transients across the impedances of the
interconnecting bond wires and circuit traces. The
interconnecting impedances should be minimized by using
wide, short printed circuit traces. The critical components
should be located together as close as possible using ground
plane construction or single point grounding. The inductor
and output capacitors should be located together as close as
possible to the NCP3102C.
