FAN7711

FAN7711 — Ballast Control Integrated Circuit May 2007 FAN7711 Ballast Control Integrated Circuit Features Floating Channel for Bootstrap Operation to +600V Low Start-up and Operating Current: 120μA, 3.2mA Under-Voltage Lockout with 1.8V of Hysteresis Adjustable Run Frequency and Preheat Time Internal Active ZVS Control Internal Protection Function (Latch Mode) Internal Clamping Zener Diode High Accuracy Oscillator Soft-Start Functionality Description The FAN7711, developed with Fairchild’s unique highvoltage process, is a ballast control integrated circuit (IC) for a fluorescent lamp. FAN7711 incorporates a preheating / ignition function, controlled by an user-selected external capacitor, to increase lamp life. The FAN7711 detects switch operation from after ignition mode through an internal active Zero-Voltage Switching (ZVS) control circuit. This control scheme enables the FAN7711 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 has a commonmode noise cancellation circuit that provides robust operation against high-dv/dt noise intrusion. 8-SOP 8-DIP Applications Electronic Ballast Ordering Information Part Number FAN7711N FAN7711M FAN7711MX Package 8-DIP 8-SOP Pb-Free Yes Operating Temperature Range -25°C ~ 125°C Packing Method Tube Tube Tape & Reel Typical Application D5 R1 U1 D1 D2 D6 R3 VDD C1 Main Supply 1 2 FAN7711 3 4 8 7 6 5 VB HO VS LO R5 Q2 R4 Q1 C4 D7 C5 L1 C6 RT CPH D3 D4 GND C2 R2 C3 Lamp C7 FAN7711 Rev. 1.00 Figure 1. Typical Application Circuit for Compact Fluorescent Lamp © 2007 Fairchild Semiconductor Corporation FAN7711 Rev. 1.0.3 www.fairchildsemi.com FAN7711 Ballast Control Integrated Circuit Internal Block Diagram V DD 1 HIGH-SIDE DRIVER 10V REG VDD sense 15V SHUNT REGULATOR VB UVLO 8 VB Reference IPH=0.6*IRT IRT BIAS & SYSTEM LATCH UVLO SDH R S Q Noise Canceller S R Q Q 7 6 HO VS 4V IPH IPH* CPH 3V 5V IPH* PRE-HEAT Control CPH