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LTC3858_15 Datasheet, PDF (29/38 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller
APPLICATIONS INFORMATION
SW1
D1
VIN
RIN
CIN
BOLD LINES INDICATE
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
SW2
D2
L1
RSENSE1 VOUT1
COUT1
L2
RSENSE2 VOUT2
COUT2
LTC3858
RL1
RL2
3858 F11
Figure 11. Branch Current Waveforms
MOSFET components to the sensitive current and voltage
sensing traces. In addition, investigate common ground
path voltage pickup between these components and the
SGND pin of the IC.
An embarrassing problem, which can be missed in an
otherwise properly working switching regulator, results
when the current sensing leads are hooked up backwards.
The output voltage under this improper hookup will still
be maintained but the advantages of current mode control
will not be realized. Compensation of the voltage loop will
be much more sensitive to component selection. This
behavior can be investigated by temporarily shorting out
the current sensing resistor—don’t worry, the regulator
will still maintain control of the output voltage.
3858fc
29