PT6907-S データシートの表示（PDF） - Princeton Technology

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PT6907-S

Linear Dimming LED Driver with Switch On/Off

Princeton Technology 

Preliminary PT6907

Linear Dimming LED Driver with Switch On/Off

DESCRIPTION

The PT6907 is a buck LED driver which has linear

dimming function with normal switch ON/OFF. While

turning-on the switch first time, the LED current will

increase from the minimum value to the maximum

current during about 9 seconds. The PT6907 builds-in

exponential algorithm and the LED’s brightness

changes smoothly and linearly. During the dimming

processing, you can turn-off the switch when the

LED’s brightness reaches the level you want. The

PT6907 can remember and hold the status for a

certain time which is programmable after turned-off.

You should turn-on the switch again within this holding

time. Then the output stays at remembered level. If

you don’t turn-off the switch during dimming

processing, the output will increase to the maximum

value and hold the status finally.

The PT6907 also integrates 10bit DAC. It is flexible for

synchronous application. You can use only one switch

to control the group LED lamps. They change

synchronously using the power line AC clock.

The PT6907 operates in open loop current mode

control, and the controller achieves good output

current regulation without the need for any loop

compensation. Also, the PT6907 operates in constant

frequency mode. The frequency is set as 50KHz.

FEATURES

• 8V to 12V Input Voltage Range

• Low Start-up Current

• Constant Frequency Operation, 50kHz typical

• Open Loop Peak Current Controller

• Linear Dimming with Normal Switch On/Off

• Programmable Holding Time

• Dimming with Exponential Algorithm, More

Suitable for Human Eyes.

• 10bit DAC Integrated for Synchronous

Application, More Flexible for Group Control

• Normal Switch Compatible

• SOP8 Package

APPLICATIONS

• Offline LED Lamps and Fixtures

• Office and Home LED Lightings

• LED Table Lamps

• Signage and Decorative LED Lightings

BLOCK DIAGRAM

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

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