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KT6340A 

LED Driver for Flashlight(手電筒)Bicycle Lighting (自行車燈)

Low-Dropout, Constant-Current White LED with Dimming Control and Low Voltage Detect

 

General Description

KT6340A provides the low-dropout bias supply and the high performance alternative solution for the white LEDs application. The build-in Low Voltage Detection and Indication function can provide the internal LED dimming. Morse Code S.O.S Signal and Single Flash Loop Flash Function are supported with the significantly lower dropout voltage. The chip is available in TO-252, SOP-8 and SOT-23 lead-free package.

 

Features

-   Low Voltage Detection and Indication: Detect Voltage Level Options by External Resistor

-   Up to 700mA LED Bias Current   External Resistor to set Output Current

-   Simple LED Dimming Control

-   Build-in Morse Code S.O.S Signal and Single Flash Loop Flash Function

-   2.7V to 6V Supply Voltage Range

-   ESD Human Body Mode Over 4KV

Dimming Function Option

    Dimming options are to set the output current 1/2,1/3, 1/4, 1/5 and 1/6.

Flash Function Option

    Flash frequency options: 1Hz / 2 Hz /4 Hz / 6 Hz , Flash duty options: 1/2, 1/4, 1/8, 1/16.

S.O.S frequency options 

   The time length of S.O.S and the interval time can be followed as the below table:

 

Option1

Option2

Option3

Option4

time length of S.O.S

17.4sec

8.6sec

4.28sec

2.86sec

Function of SET

   When keeping at high level, SET pin will active as the requested function in order, like LED ON /OFF, dimming , Flash and S.O.S mode.

Low Voltage Detection

   The KT6340A builds in Low Voltage Detection and Indication function. If VIN voltage drops to the default value of Detection Voltage, LVLED pin will turn on to lighten the low voltage indicator.

Detected options 

   a. Voltage level detection options are subject to the External Resistor.

   b. LVLED output current options are: 2,4, 6, 8mA.

 

Typical Application

KT6340AKT6340A

KT6340AKT6340A