FAN7710 — Ballast Control IC for Compact Fluorescent Lamps
June 2007
FAN7710
Ballast Control IC for Compact Fluorescent Lamps
Features
Integrated Half-Bridge MOSFET
Floating Channel for Bootstrap Operation up to +550V
Low Start-up and Operating Current: 120μA, 2.6mA
Under-Voltage Lockout with 1.8V of Hysteresis
Adjustable Run Frequency and Preheat Time
Internal Active ZVS Control
Internal Protection Function (No Lamp)
Internal Clamping Zener Diode
High Accuracy Oscillator
Soft-Start Functionality
Description
The FAN7710, 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 controls internal
high-voltage stress and delivers 20W to the lamp at
310V
DC
voltage. FAN7710 incorporates a preheating /
ignition function, controlled by an user-selected external
capacitor, to increase lamp life. The FAN7710 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 has a common-
mode noise cancellation circuit that provides robust
operation against high-dv/dt noise intrusion.
8-DIP
Applications
Compact Fluorescent Lamp Ballast
Ordering Information
Part Number
FAN7710N
Package
8-DIP
Pb-Free
Yes
Operating Temperature Range
-25°C ~ 125°C
Packing Method
Tube
© 2007 Fairchild Semiconductor Corporation
FAN7710 Rev. 1.0.2
www.fairchildsemi.com
FAN7710 — Ballast Control IC for Compact Fluorescent Lamps
Typical Application Diagrams
* Refer to the BOM and design guide provided on page16.
Figure 1. Typical Application Circuit for Compact Fluorescent Lamp
Internal Block Diagram
V
DD
1
10V REG
15V SHUNT
REGULATOR
V
DD
Sense
V
DC
HIGH-SIDE DRIVER
V
B
UVLO
8
7 V
B
Reference
IPH
=0.6*IRT
BIAS & SYSTEM LATCH
BGR
CPH
3V 5V
UVLO
UVLO
SDH
R
S
BIAS
TSD
SYSHALT
Q
Q
SHORT-PULSE
GENERATOR
SDL
SET
Noise
Canceller
S
R
V
S
Q
Q
4V
IRT
IPH
IPH*
IRT
RT
2
PRE-HEAT
Control
CPH<3V
Yes
2µA
12µA
No
CPH
0A
6 OUT
LOW-SIDE GATE DRIVER
DELAY
DEAD TIME
Control
OSCILLATOR
RESET
IPH*
V
DDH
/V
DD
LSH
V
DDH
/V
DD
LSH
SDL
SDH
5 PGND
CPH
3
SDL
5V/3V
S
SDH
R
Q
Q
RESET
SYSHALT
ADAPTIVE
ZVS CONTROLLER
TRANSITION
SENSING
ADAPTIVE ZVS ENABLE LOGIC
4
SGND
FAN7710 Rev. 1.00
Figure 2. Functional Block Diagram
© 2007 Fairchild Semiconductor Corporation
FAN7710 Rev. 1.0.2
2
www.fairchildsemi.com
FAN7710 — Ballast Control IC for Compact Fluorescent Lamps
Pin Configuration
V
DC
8
V
B
7
OUT
6
PGND
5
FAN7710
YWW
(YWW : Work Week Code)
1
V
DD
2
RT
3
CPH
4
SGND
FAN7710 Rev. 1.00
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name
V
DD
RT
CPH
SGND
PGND
OUT
V
B
V
DC
Supply voltage
Oscillator frequency set resistor
Preheating time set capacitor
Signal ground
Power ground
High-side floating supply return
High-side floating supply
High-voltage supply
Description
© 2007 Fairchild Semiconductor Corporation
FAN7710 Rev. 1.0.2
3
www.fairchildsemi.com
FAN7710 — Ballast Control IC for Compact Fluorescent Lamps
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In
addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only. T
A
=25°C unless otherwise specified.
Symbol
V
B
V
OUT
V
IN
I
CL
dV
OUT
/dt
T
A
T
STG
P
D
θ
JA
Note:
High-side floating supply
Parameter
High-side floating supply return
RT, CPH pins input voltage
Clamping current level
Allowable offset voltage slew rate
Operating temperature range
Storage temperature range
Power dissipation
Thermal resistance (junction-to-air)
Min. Typ. Max. Unit
-0.3
-0.3
-0.3
50
-25
-65
2.1
70
125
150
575
550
8
25
V
V
V
mA
V/ns
°C
°C
W
°C/W
1. Do not supply a low-impedance voltage source to the internal clamping Zener diode between the GND and the V
DD
pin of this device.
© 2007 Fairchild Semiconductor Corporation
FAN7710 Rev. 1.0.2
4
www.fairchildsemi.com
FAN7710 — Ballast Control IC for Compact Fluorescent Lamps
Electrical Characteristics
V
BIAS
(V
DD
, V
B
-V
out
) = 14.0V, T
A
= 25°C, unless otherwise specified.
Symbol
V
DC
Parameter
High-voltage supply voltage
Condition
Min. Typ. Max. Unit
550
V
13.4
11.6
1.8
15.2
120
2.6
8.5
7.9
9.2
8.6
0.6
50
250
μA
10.0
9.5
V
μA
mA
14.4
12.4
V
High-Voltage Supply Section
Low-Side Supply Section (V
DD
)
V
DDTH(ST+)
V
DD
UVLO positive going threshold
V
DDTH(ST-)
V
DD
UVLO negative going threshold
V
DDHY(ST)
V
CL
I
ST
I
DD
V
DD
-side UVLO hysteresis
Supply clamping voltage
Start-up supply current
Dynamic operating supply current
I
DD
=20mA
V
DD
= 10V
Running freq,C
L
= 1nF
14.8
V
DD
increasing
V
DD
decreasing
12.4
10.8
High-Side Supply Section (V
B
-V
OUT
)
V
HSTH(ST+)
High-side UVLO positive going threshold V
B
-V
OUT
increasing
V
HSTH(ST-)
High-side UVLO negative going threshold V
B
-V
OUT
decreasing
V
HSHY(ST)
I
HST
I
HD
High-side UVLO hysteresis
High-side quiescent supply current
High-side dynamic operating supply
current
CPH pin preheating voltage range
CPH pin charging current during
preheating
CPH pin charging current during ignition
CPH pin voltage level at running mode
Preheating frequency
Running frequency
Maximum dead time
Minimum dead time
RT = 80kΩ, V
CPH
= 2V
RT = 80kΩ
V
CPH
= 1V, V
OUT
= GND during
preheat mode
V
CPH
= 6V, V
OUT
= GND during
run mode
2.6
250
165
V
DS
= 500V
V
GS
= 12V, I
D
= 100mA
V
GS
= 12V, I
D
= 500mA
V
GS
= 12V, V
DS
= 30V
800
6.2
6.5
10
450
72
48.7
V
CPH
= 1V
V
CPH
= 4V
V
B
-V
OUT
= 14V
Running freq,C
L
= 1nF
Oscillator Section
V
MPH
I
PH
I
IG
V
MO
f
PRE
f
OSC
DT
MAX
DT
MIN
2.5
1.25
8
3.0
2.00
12
7.0
85
53.0
3.1
1.0
98
57.3
3.5
2.85
16
V
kHz
kHz
μs
μs
V
μA
Protection Section
V
CPHSD
I
SD
TSD
I
LKMOS
R
ON
I
SAT
Shutdown voltage
Shutdown current
Thermal shutdown
(2)
MOSFET leakage current
On resistance (dynamic)
Saturation current
(2)
V
RT
= 0 after run mode
V
μA
°C
μA
Ω
mA
MOSFET Section
Note:
2. This parameter, although guaranteed, is not 100% tested in production.
© 2007 Fairchild Semiconductor Corporation
FAN7710 Rev. 1.0.2
5
www.fairchildsemi.com
NXP MCU
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