LD6801GL datasheet(9/11 Pages) LEADTREND

tên linh kiện	LD6801GL

Giải thích chi tiết về linh kiện	LED Lighting Output Current Ripple Suppressor

PDF	11 Pages

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LD6801

07/28/2015

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD6801-DS-00 July 2016

Fig. 11

VIN Zener Clamp and RIN Selection

The LD6801 support wide range LED

light bar

application that integrated Zener diode which is about

2mA sink current and VUV_ON is to 16V. So the value of

RIN that is connected between VLED and VIN of LD6801,

we can be calculated as below:

(VLED_MIN –VUV_ON) / 0.5mA > RIN

And

RIN > (VLED_MAX – VIN_CLAMP) / 2mA

Where VLED is a terminal voltage of LED light bar

Internal Thermal protection

Thermal protection limits total power dissipation in this

device. When the junction temperature reaches 130

C

approximately, The LD6801 would be turn off the

MOSFET

until the IC’s junction temperature cools down

approximately 30°C.

PCB Design Guideline

The bypass capacitor of VIN should be placed as

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

LD6801 should be placed near to the external

MOSFET

To consider temperature requirement, we need

add PCB pad or heat sink be to fit system spec.

The area of LED current loop should be as small

as possible

Over

Voltage

40uA

IOVP

OVP

ROVP

VOUT

ILED

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