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 Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT5621 APPLICATION CIRCUIT V1.0 2 PT5621 ORDER INFORMATION Valid Part Number PT5621-D PT5621-S Package Type 16 Pins, DIP, 300MIL 16 Pins, SOP, 150MIL Top Code PT5621-D PT5621-S PIN CONFIGURATION IN DESCRIPTION Pin Name GND CP RF ROSC COSC CTR1, 2 DIM IL DATA0 RIND DATA1, 2 LO VDD HO V1.0 Description Ground Preheat time and sweeping ignition control pin Internal reference current bias setting pin, The pin’s voltage reference is fixed at 1.5V. It connects to an external resistor to determine the internal current reference, typical value is 75K Oscillator connects to an external resistor to determine the oscillating frequency Oscillator connects to an external capacitor to determine the oscillating frequency Dimming level setting pin The different output states of the CTR1& CTR2 make the voltage divider consisting of external resistors output different voltage level to the DIM pin and set different dimming level Dimming input Pin Lamp current sampling NC This pin is shorted to GND Protection input pin The Lives sensing pins Low-side gate driver output Power supply, operating voltage is 13V High-side gate driver output Pin No. 1 2 3 4 5 6, 7 8 9 10 11 12, 13 14 15 16 3 PT5621 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.0 4