LTC3731 Datasheet, PDF (23/32 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731
APPLICATIO S I FOR ATIO
which is less than one third of the normal, full load
conditions. Incidentally, since the load no longer dissi-
pates any power, total system power is decreased by over
90%. Therefore, the system actually cools significantly
during a shorted condition!
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
IC. These items are also illustrated graphically in the layout
diagram of Figure 11. Check the following in the PC layout:
SW1
D1
L1
R_SENSE1
V_IN
R_IN
+
C_IN
SW2
D2
L2
R_SENSE2
V_OUT
+
C_OUT
R_L
BOLD LINES INDICATE HIGH,
SWITCHING CURRENT LINES.
KEEP LINES TO A MINIMUM
LENGTH
SW3
D3
L3
R_SENSE3
3731 F11
Figure 11. Branch Current Waveforms
3731fa
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