1506F 查看數據表（PDF） - Linear Technology

零件编号

产品描述 (功能)

生产厂家

1506F

4.5A, 500kHz Step-Down Switching Regulator

Linear Technology 

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.

MINIMIZE LT1506 C3, D1 LOOP

CONNECT TO

GROUND PLANE

VIN

C3

D1

C5

GND

C6

1

GND

U1

L1

VOUT

TAKE OUTPUT

DIRECTLY FROM

END OF OUTPUT

CAPACITOR

C1 R3

CONNECT TO

PLACE FEEDTHROUGHS

GROUND PLANE AROUND GND PIN FOR GOOD

THERMAL CONDUCTIVITY

R2

KEEP FB AND VC COMPONENTS

AWAY FROM HIGH FREQUENCY,

HIGH CURRENT COMPONENTS

D2

C4

Figure 5. Suggested Layout (Topside Only Shown)

KELVIN SENSE

VOUT

1506 F05

SWITCH NODE

L1

5V

HIGH

FREQUENCY

VIN

CIRCULATING

PATH

LOAD

1506 F06

Figure 6. High Speed Switching Path

15

Share Link: