RT8487

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DS8487-00

March

2015

12

Place the capacitor

C1 as close as possible

to the VCC pin

Power GND

LED-

LED+

C1

D1

Analog GND

1

VCC

VC

GND

AND

SENSE

GATE

5

2

3

6

4

R1

RT8487

Place the compensation

Components C2 and R3B as

close as possible to the IC

Analog GND

R2

C2

R3B

VCC

Narrow trace from

main circuit to the IC

to avoid the

switching noise

SENSE

ZD(Option)

Place the MOSFET Q1, the

as close as possible to the

each other

Kelvin sense from the sense resistor

directly from the sense resistor is

necessary to avoid the sense threshold

setting error by the parasitic PCB trace

resistance.

Figure 2. PCB Layout Guide