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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 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
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
V
DD
C1
Main
Supply
1
2
FAN7711
3
4
8
7
6
5
V
B
HO
V
S
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
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