LTC3731_15 Datasheet, PDF (24/34 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731
APPLICATIONS INFORMATION
which is less than one third of the normal, full load con-
ditions. Incidentally, since the load no longer dissipates
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
L1
R_SENSE1
D1
V_IN
R_{IN +}
C_IN
SW2
D2
L2
R_SENSE2
V_OUT
+
C_OUT
R_L
BOLD LINES INDICATE HIGH,
SWITCHING CURRENTS.
KEEP LINES TO A MINIMUM
LENGTH.
24
SW3
D3
L3
R_SENSE3
3731 F11
Figure 11. Branch Current Waveforms
3731fc