LD8115

03/10/2017

10

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD8115-DS-00 March 2017

Thermal protection

When

the

junction

temperature

reaches

130

C

approximately, the thermal sensor signals would pull the

OUT to Low. The Photo-coupler would limit the output

voltage and reduce LED current. The thermal sensor will

turn on CC/CV loop again after the IC

’s junction

temperature cools by 30

C.

PCB Design Guideline

1.

close as possible to the VCC and GND pin of IC.

2.

Current Sense current loop should be as short as

possible between the ISEN and LD8115 GND pin

3.

The traces of LED current loop should be as

strong and short as possible.

4.

GND should be connected to a strong ground

plane

Fig. 12

7

8

6

5

1

2

3

4

ISEN

VCC

VREF

DCDIM

OUT

GND

ADIM

VSEN

VCC capacitor should

be placed as close as

possible to the VCC

PIN

Sense resistor should

be placed as close as

possible to the ISEN

and GND pin

VSEN Feedback

resistor should be

placed as close as

possible to the VSEN

and IC GND pin