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PDF FAN7711 Data sheet ( Hoja de datos )
| Número de pieza | FAN7711 | |
| Descripción | Ballast Control IC | |
| Fabricantes | Fairchild Semiconductor | |
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FAN7711
Ballast Control IC
March 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
Description
The FAN7711, developed using 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.
Applications
Electronic Ballast
www.DataSheet4U.com
8-SOP
8-DIP
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
© 2007 Fairchild Semiconductor Corporation
FAN7711 Rev. 1.0.2
www.fairchildsemi.com
1 page  
Electrical Characteristics
VBIAS (VDD, VBS) = 15.0V, TA = 25°C, unless otherwise specified.
Symbol
Characteristics
Condition
Supply Voltage Section
VDDTH(ST+) VDD UVLO positive going threshold
VDD increasing
VDDTH(ST-) VDD UVLO negative going threshold
VDD decreasing
VDDHY(ST) VDD-side UVLO hysteresis
VCL Supply clamping voltage
IDD =10mA
IST Start-up supply current
VDD = 10V
IDD Dynamic operating supply current
50kHz, CL = 1nF
High-Side Supply Section (VB-VS)
VHSTH(ST+) High-side UVLO positive going threshold VBS increasing
VHSTH(ST-) High-side UVLO negative going threshold VBS decreasing
VHSHY(ST) High-side UVLO hysteresis
IHST High-side quiescent supply current
VBS = 14V
IHD
High-side dynamic operating supply
current
50kHz, CL = 1nF
ILK Offset supply leakage current
Oscillator Section
VB = VS = 600V
VMPH
IPH
CPH pin preheating voltage range
CPH pin charging current during
preheating
VCPH = 1V
IIG
VMO
fPRE
fOSC
DTMAX
CPH pin charging current during ignition
CPH pin voltage level at running mode
Preheating frequency
Running frequency
Maximum dead time
VCPH = 4V
RT = 80kΩ, VCPH = 2V
RT = 80kΩ
VCPH = 1V, VS = GND during
preheat mode
DTMIN Minimum dead time
VCPH = 6V, VS = GND during
run mode
Output Section
IOH+
IOH-
IOL+
IOL-
tHOR
tHOL
tLOR
tLOL
VS(2)
High-side driver sourcing current
High-side driver sinking current
Low-side driver sourcing current
Low-side driver sink current
High-side driver turn-on rising time
High-side driver turn-off rising time
Low-side driver turn-on rising time
Low-side driver turn-off rising time
Maximum allowable negative VS swing
range for signal propagation to high-side
output
PW = 10μs
PW = 10μs
PW = 10μs
PW = 10μs
CL = 1nF, VBS = 15V
CL = 1nF, VBS = 15V
CL = 1nF, VBS = 15V
CL = 1nF, VBS = 15V
Min. Typ. Max. Unit
12.4 13.4 14.4
10.8 11.6 12.4
1.8
14.8 15.2
120 200
3.2
V
μA
mA
8.5 9.2 10.0
7.9 8.6 9.5 V
0.6
50 μA
1 mA
45 μA
2.5 3.0 3.5 V
1.25 2.00 2.85
8 12 16
μA
7.0 V
72 85 98 kHz
48.7 53.0 57.3 kHz
3.1 μs
1.0 μs
250 350
500 650
250 350
500 650
45
25
45
25
-9.8
mA
ns
V
© 2007 Fairchild Semiconductor Corporation
FAN7711 Rev. 1.0.2
5
www.fairchildsemi.com
5 Page 
40dB
20dB
RL=100k
0dB
RL=1k
RL=500
RL=10k
Preheating
frequency
(B)
(C) (A)
Running frequency
FAN7711 Rev. 1.00
(D) Dead-time control mode
at fixed frequency
Figure 19. LCC Transfer Function in Terms of
Lamp Impedance
3. Operation Modes
FAN7711 has four operation modes: (A) preheating
mode, (B) ignition mode, (C) active ZVS mode, and (D)
shutdown mode, depicted in Figure 20. The modes are
automatically selected by the voltage of CPH capacitor,
shown in Figure 20. In modes (A) and (B), the CPH acts
as a timer to determine the preheating and ignition times.
After the preheating and ignition modes, the role of the
CPH is changed to stabilize the active ZVS control
circuit. In this mode, the dead time of the inverter is
selected by the voltage of CPH. Only when FAN7711 is
in active ZVS mode is it possible to shut off the whole
system using CPH pin. Pulling the CPH pin below 2V in
active ZVS mode, causes the FAN7711 to enter
shutdown mode. In shutdown mode, all active operation
is stopped, except UVLO and some bias circuitry. The
shutdown mode is triggered by the external CPH control
or the active ZVS circuit. The active ZVS circuit
automatically detects lamp removal (open-lamp
condition) and decreases CPH voltage below 2V to
protect the inverter switches from damage.
CPH voltage [V]
8
7 (B) Ignition Mode
(C) Active ZVS Mode
6
5
4 (A) Preheating Mode
3
2
1
Dead 3Time2[μs1]
0
0
Oscillation
Frequency
Preheating Frequency:fPRE
Preheating
Mode
Ignition
Mode
t0 t1
(D) Shutdown
mode
time
Running Frequency:
fOSC
Running
Mode
t2 t3
time
FAN7711 Rev. 1.00
Figure 20. Operation Modes
3.1 Preheating Mode (t0~t1)
When VDD exceeds VDDTH(ST+), the FAN7711 starts
operation. At this time, an internal current source (IPH)
charges CPH. CPH voltage increases from 0V to 3V in
preheating mode. Accordingly, the oscillation frequency
follows the Equation 4. In this mode, the lamp is not
ignited, but warmed up for easy ignition. The preheating
time depends on the size of CPH:
fpreheat
=
3 ×CPH
IPH
[Sec.]
(EQ 4)
According to preheating process, the voltage across the
lamp to ignite is reduced and the lifetime of the lamp is
increased. In this mode, the dead time is fixed at its
maximum value.
3.2 Ignition Mode (t1~t2)
When the CPH voltage exceeds 3V, the internal current
source to charge CPH is increased about six times larger
than IPH, noted as IIG, causing rapid increase in CPH
voltage. The internal oscillator decreases the oscillation
frequency from fPRE to fOSC as CPH voltage increases.
As depicted in Figure 20, lowering the frequency
increases the voltage across the lamp. Finally, the lamp
ignites. Ignition mode is defined when CPH voltage lies
between 3V and 5V. Once CPH voltage reaches 5V, the
FAN7711 does not return to ignition mode, even if the
CPH voltage is in that range, until the FAN7711 restarts
from below VDDTH(ST-). Since the ignition mode
continues when CPH is from 3V to 5V, the ignition time is
given by:
tignition
=
2 × CPH
IIG
[Sec.]
(EQ 5)
In this mode, dead time varies according to the CPH
voltage.
© 2007 Fairchild Semiconductor Corporation
FAN7711 Rev. 1.0.2
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet FAN7711.PDF ] | |
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