PT5621

Three-Way Ballast Controller

DESCRIPTION

The PT5621 is an electronic ballast controller IC

specifically for three-way dimming fluorescent lamps.

The features of the controller include negative-feedback

closed-loop control of the lamp current, programmable

preheat time, low start-up current and precise oscillating

frequency. PT5621 is available in both DIP16 and

SOP16 packages.

APPLICATION

• Various types of fluorescent lamps/CFL (specifically

for three-way dimming application)

FEATURES

• Three-way dimming fluorescent lamp electronic

ballast

• Closed-loop control of the lamp current

• Precise working frequency control

• Programmable preheat time

• Constant frequency preheat, sweeping frequency

ignition

• Fixed dead time

• Supporting low luminance Ignition

• Supporting DIP16/SOP16 packages

BLOCK DIAGRAM