PT6905 Просмотр технического описания (PDF) - Princeton Technology

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PT6905

3-Stage Dimming LED Driver

Princeton Technology 

DESCRIPTION

The PT6905 is a continuous mode inductive step-down

converter with three-stage dimming, designed for driving

single or multiple series white LEDs efficiently from a

voltage source higher than the output LED voltage. The

IC operates from an input supply between 6V and 36V

and provides three-stage dimming with output current of

up to 1.2Amp.

The PT6905 includes the internal switch and a high-side

output current sensing circuit, which uses an external

resister to set the average output current.

The PT6905 has a three-stage dimming function. That is

to say the output current will be adjusted to 100% when

the first time power on corresponding to stage-one, 30%

when the second time power on corresponding to

stage-two and 10% when the third time power on

corresponding to stage-three. The cycle will restart to

stage-one again when the fourth time power on. So this

cycle will go on if the power off time is no less than six

seconds according to the external capacitor Cs of 10μF.

And the power could be saved if less light needed.

BLOCK DIAGRAM

Preliminary PT6905

3-Stage Dimming LED Driver

FEATURES

• High Efficiency (up to 95%)

• Maximum 1.2A Output Current

• Wide Input Voltage: 6V ~ 36V

• Three-Stage Dimming

• Typical 5% Output Current Accuracy

• Thermal Shutdown 150℃ Typical

• SOT-89-5L Package

APPLICATIONS

• DC/DC LED Driver

• Low Voltage Industrial LED Lighting

• Low Voltage Halogen Replacement LEDs

• Decorative LED Lighting

• LED Table Lighting

Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan

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