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LT1506

APPLICATIONS INFORMATION

from the switch node. Also note that the high current

ground path of the catch diode and input capacitor are kept

very short and separate from the analog ground line.

The high speed switching current path is shown schemati-

cally in Figure 6. Minimum lead length in this path is

essential to ensure clean switching and low EMI. The path

including the switch, catch diode, and input capacitor is

the only one containing nanosecond rise and fall times. If

you follow this path on the PC layout, you will see that it is

irreducibly short. If you move the diode or input capacitor

away from the LT1506, get your resumé in order. The

other paths contain only some combination of DC and

500kHz triwave, so are much less critical.

Figure 5. Suggested Layout (Topside Only Shown)

Figure 6. High Speed Switching Path

CONNECT TO

GROUND PLANE

KEEP FB AND VC COMPONENTS

AWAY FROM HIGH FREQUENCY,

HIGH CURRENT COMPONENTS

PLACE FEEDTHROUGHS

AROUND GND PIN FOR GOOD

THERMAL CONDUCTIVITY

1506 F05

GND

VOUT

VIN

GND

CONNECT TO

GROUND PLANE

MINIMIZE LT1506 C3, D1 LOOP

KELVIN SENSE

VOUT

TAKE OUTPUT

DIRECTLY FROM

END OF OUTPUT

CAPACITOR

1506 F06

VIN

HIGH

FREQUENCY

CIRCULATING

PATH

LOAD

SWITCH NODE

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