Compact and Linear Fluorescent Electronic Ballasts - Fairchild FAN7710 and FAN7711

Fairchild introduced its FAN7710 and FAN7711 electronic ballast ICs for compact fluorescent lamps (CFL) and linear fluorescent lamp (LFL). The new ballast IC is system-in-a-package solution, designed  for saving space in fluorescent lamp applications.  By offering the FAN7711 fluorescent ballast for both compact and linear fluorescent lamp applications, designers will have flexibility to optimize performance, power, and space according to the specific application requirements.

The FAN7710 electronic ballast combines two 550V MOSFETs, one high-side 625V gate driver circuit, a frequency control circuit and a shunt regulator, plus the added features of active ZVS control and an open lamp detection function. The FAN7710's high functionality and built-in protection features save board space, reduce power dissipation and result in excellent temperature characteristics and enhanced reliability in end systems.

For linear fluorescent lamp designs, the new ballast IC integrates all but the two high-power MOSFETs offered by the FAN7710 fluorescent ballast to make it better suited to LFL designs.

The FAN7710 fluorescent ballast IC, developed using Fairchild’s unique high-voltage process and system-in-package (SiP) concept, is a ballast control integrated circuit (IC) for a compact fluorescent lamp (CFL). The FAN7710 fluorescent ballast controls internal high-voltage stress and delivers 20W to the lamp at 310VDC voltage. FAN7710 fluorescent ballast incorporates a preheating / ignition function, controlled by an user-selected external capacitor, to increase lamp life. The FAN7710 fluorescent ballast detects switch operation from after ignition-mode through an internal active Zero-Voltage Switching (ZVS) control circuit. This control scheme enables the FAN7710 to detect an open-lamp condition, without the expense of external circuitry, and prevents stress on MOSFETs.
The high-side driver built into the FAN7710 fluorescent ballast has a common-mode noise cancellation circuit that provides robust operation against high-dv/dt noise intrusion.

The FAN7711 fluorescent ballast IC, developed using Fairchild’s unique high-voltage process, is a ballast control integrated circuit (IC) for a fluorescent lamp. FAN7711 fluorescent ballast  incorporates a preheating / ignition function, controlled by an user-selected external capacitor, to increase lamp life. The FAN7711 fluorescent ballast detects switch operation from after ignition mode through an internal active Zero-Voltage Switching (ZVS) control circuit. This control scheme enables the FAN7711 fluorescent ballast  to detect an open-lamp condition, without the expense of external circuitry, and prevents stress on MOSFETs. The high-side driver built into the FAN7711 fluorescent ballast  has a common-mode noise cancellation circuit that provides
robust operation against high-dv/dt noise intrusion.

Features of FAN7710 fluorescent electronic ballast:

• Integrated Half-Bridge MOSFET
• Low Start-up and Operating Current: 120µA, 2.6mA
• Floating Channel for Bootstrap Operation up to +550V.
• Under-Voltage Lockout with 1.8V of Hysteresis
• Internal Active ZVS Control
• Adjustable Run Frequency and Preheat Time
• Internal Protection Function (No Lamp)
• High Accuracy Oscillator
• Internal Clamping Zener Diode
• Soft-Start Functionality

Features FAN7711 fluorescent electronic ballast:

• Floating Channel Designed for Bootstrap Operation to +600V.
• Under-Voltage Lockout with 1.8V of Hysteresis
• Low Start-up and Operating Current: 120µA, 3.2mA
• Adjustable Run Frequency and Preheat Time
• Internal Protection Function (Latch Mode)
• Internal Active ZVS Control
• Internal Clamping Zener Diode
• Soft-Start Functionality
• High Accuracy Oscillator

The new fluorescent ballast ICs are packed in both 8-DIP and 8-SOP packages. Price are (each in 1K):

• FAN7710 electronic ballast: $ 1.51
• FAN7711 electronic ballast: $ 1.25

More info: Fairchild FAN7710 and FAN7711 Fluorescent Ballast ICs