CFL Ballast for 26w/ Sprial Lamp 220Vac Input:  The IRPLCFL5E reference design is an electronic ballast for driving 26W compact fluorescent lamps from 220VAC. The circuit provides all of the necessary functions for preheat, ignition and onstate operation of the lamp and also includes the EMI filter and the rectification stage. The circuit is built around the IR2520D Ballast Control IC.  (circuit design added 3/05)

Digital Dimming DALI Ballast for 32w/T8 110V Input:  This reference design is a high efficiency, high power factor, digital dimming electronic ballast designed to drive rapid start fluorescent lamp types. The design contains an active power factor correction circuit for universal voltage input as well as a ballast control circuit using the IR21592. The design also includes a PIC16F628 microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI).  (circuit design added 3/05)

Digital Dimming DALI Ballast for 36w/T8 220V Input:  This reference design is a high efficiency, high power factor, digital dimming electronic ballast designed to drive rapid start fluorescent lamp types. The design contains an active power factor correction circuit for universal voltage input as well as a ballast control circuit using the IR21592. The design also includes a PIC16F628 microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI).  (circuit design added 3/05)

Digitally Addressable DALI Dimming Ballast:  (Electronic circuit added 4/05)

Disturbance simulator checks lines:  10/14/00 EDN Design Ideas  / (added 5/05) 

Dual Monostable Drives Quasiresonant Inverter:  02/17/97 EDN-Design Ideas / (circuit / schematic added 2/03)A zero-voltage-switching (ZVS) controller usually integrates a one-shot circuit, embodied in a VCO system. An error amplifier monitors the output voltage and adjusts the VCO's off-time to keep the output value at a constant level. Each on-time period commences as soon as the primary voltage drops to zero, thus eliminating on/off commutation losses associated with the switching element. The controller also incorporates other convenient features, such as MOSFET drivers, a voltage reference, and overvoltage and undervoltage lockouts. In low-cost circuits, such a complex architecture can lead to a prohibitive cost, especially if you don't need the cited features (in open-loop systems, for instance). Figure 1 shows an 8W, ZVS fluorescent-lamp converter made from two low-cost ICs, a CD4538 and an LM393.... 

Electronic Ballasts using the Cost Saving IR215x:  application note AN-995 from International Rectifier (Electronic Schematic / circuit added 4/02)

Electronic Fluorescent Lamp Ballast:  International Rectifier application note in PDF format (Electronic Schematic / circuit added 4/02)

Emergency Lighting Systems and Battery Powered Fluorescent Lighting: High Current To92 Switching Transistors Provide 87% DC-AC Conversion Efficiency:  Zetec Semiconductors  - Applications Notes - An overview of the principles behind typical emergency lighting systems, fluorescent tube behaviour, and the requirements of the transistors for efficient voltage inversion. The note also includes two "Royer" based designs for low voltage systems.   (added 2/06)

Enhanced Multi-mode CCFL Controller (AN-33):  Application Note 33 from Microsem  (Circuit / schematic design added 6/06)

Fluorescent Lamps Ballasts and Fixtures:  (circuit / schematic added 2/03)

Half Bridge Inverter has Variable Frequency:  10/09/97 EDN-Design Ideas  /  (added 2/2003) Modern electronic ballasts require added features, such as high-frequency preheat for filaments, nominal lamp-power control, and light-dimming capability. Because the output inverter operates in resonant mode, you can control the power or current of these ballasts simply by varying the switching frequency. To vary the frequency, you can build a simple VCO that uses a half-bridge MOSFET driver (Figure 1). You can use this VCO as the core of a controller for a supply or ballast that requires a variable frequency....

IR21571 Ballast Control IC Design Kit:  The IRPLLNR2 is a high efficiency, high power factor, fixed output electronic ballast designed for driving rapid start fluorescent lamp types. The design contains an EMI filter, active power factor correction and a ballast control circuit using the IR21571. This demo board is intended to ease the evaluation of the IR21571 Ballast Control IC, demonstrate PCB layout techniques and serve as an aid in the development of production ballast’s using the International Rectifier IR21571.  (circuit design added 3/05)

IR21592 Dimming Ballast Control IC Design Kit:  The IRPLDIM1E is a high efficiency, high power factor, dimming electronic ballast designed for driving rapid start fluorescent lamp types. The design contains an EMI filter,active power factor correction and a ballast control circuit using the IR21592.  (circuit design added 3/05)

IRPLMB1e: 25w 230Vac Small Size Ballast using IR2520d:  The circuit is built around the IR2520D Ballast Control IC. The IR2520D provides adjustable preheat time, adjustable run frequency to set the lamp power, high starting frequency for soft start and to avoid lamp flash, fault protection for open filament condition and failure to strike, low AC line protection and auto-restart after line brownout conditions. line brownout conditions. (circuit design added 3/05)