FAN7711_07 Datasheet, PDF (1/21 Pages) Fairchild Semiconductor – Ballast Control Integrated Circuit

FAN7711
Ballast Control Integrated Circuit
May 2007
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
Applications
„ Electronic Ballast
Description
The FAN7711, developed with Fairchild’s unique high-
voltage 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 common-
mode noise cancellation circuit that provides robust
operation against high-dv/dt noise intrusion.
8-SOP
8-DIP
Ordering Information
Part Number
FAN7711N
FAN7711M
FAN7711MX
Package
8-DIP
8-SOP
Typical Application
Pb-Free
Yes
Operating Temperature Range
-25°C ~ 125°C
Packing Method
Tube
Tube
Tape & Reel
D5
R3
R1
D6
U1
Main
Supply
D1 D2
C1
V_{DD 1}
RT ₂
CPH ₃
FAN7711
8 ^VB
7 ^{HO R4}
6 ^VS
Q1 C4 D7 C5 L1
C6
D3 D4
GND ₄
C2 R2 C3
5 ^{LO R5}
Q2
Lamp
C7
Figure 1. Typical Application Circuit for Compact Fluorescent Lamp
FAN7711 Rev. 1.00
© 2007 Fairchild Semiconductor Corporation
FAN7711 Rev. 1.0.3
www.fairchildsemi.com