LTC3731H Linear Technology, LTC3731H Datasheet - Page 24

• Manufacturer Part Number: LTC3731H
• Description: Synchronous Buck Switching Regulator Controller
• Manufacturer: Linear Technology

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APPLICATIO S I FOR ATIO
LTC3731H
24
V
IN
R
BOLD LINES INDICATE HIGH,
SWITCHING CURRENT LINES.
KEEP LINES TO A MINIMUM
LENGTH
IN
+
C
IN
Figure 12. Kelvin Sensing R
LTC3731H
SENSE
SENSE
U
+
–
U
1000pF
OUTPUT CAPACITOR
INDUCTOR
W
SENSE
RESISTOR
SENSE
3731H F12b
Figure 11. Branch Current Waveforms
SW2
SW3
SW1
D2
D1
D3
U
L1
L2
L3
7) The 47pF to 330pF ceramic capacitor between the I
pin and signal ground should be placed as close as
possible to the IC.
Figure 11 illustrates all branch currents in a three-phase
switching regulator. It becomes very clear after studying
the current waveforms why it is critical to keep the high
switching current paths to a small physical size. High elec-
tric and magnetic fields will radiate from these “loops” just
as radio stations transmit signals. The output capacitor
R
R
R
SENSE2
SENSE3
SENSE1
C
3731H F11
OUT
+
V
OUT
3731hf
TH
R
L