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PDF FAN7710 Data sheet ( Hoja de datos )
| Número de pieza | FAN7710 | |
| Descripción | Ballast Control IC | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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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
Applications
Compact Fluorescent Lamp Ballast
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
310VDC 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
Ordering Information
Part Number
FAN7710N
Package
8-DIP
Pb-Free Operating Temperature Range Packing Method
Yes -25°C ~ 125°C
Tube
© 2007 Fairchild Semiconductor Corporation
FAN7710 Rev. 1.0.2
www.fairchildsemi.com
1 page  
Electrical Characteristics
VBIAS (VDD, VB -Vout) = 14.0V, TA = 25°C, unless otherwise specified.
Symbol
Parameter
Condition
Min. Typ. Max. Unit
High-Voltage Supply Section
VDC High-voltage supply voltage
Low-Side Supply Section (VDD)
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 =20mA
IST Start-up supply current
VDD = 10V
IDD Dynamic operating supply current
Running freq,CL = 1nF
High-Side Supply Section (VB-VOUT)
VHSTH(ST+) High-side UVLO positive going threshold VB -VOUT increasing
VHSTH(ST-) High-side UVLO negative going threshold VB -VOUT decreasing
VHSHY(ST) High-side UVLO hysteresis
IHST High-side quiescent supply current
VB -VOUT = 14V
IHD
High-side dynamic operating supply
current
Running freq,CL = 1nF
550 V
12.4 13.4 14.4
10.8 11.6 12.4
1.8
14.8 15.2
120
2.6
V
μA
mA
8.5 9.2 10.0
7.9 8.6 9.5 V
0.6
50
250 μA
Oscillator Section
VMPH
IPH
IIG
VMO
fPRE
fOSC
DTMAX
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
VCPH = 1V
VCPH = 4V
2.5
1.25
8
RT = 80kΩ, VCPH = 2V
RT = 80kΩ
VCPH = 1V, VOUT = GND during
preheat mode
72
48.7
3.0
2.00
12
7.0
85
53.0
3.1
3.5
2.85
16
98
57.3
V
μA
V
kHz
kHz
μs
DTMIN Minimum dead time
VCPH = 6V, VOUT= GND during
run mode
1.0
μs
Protection Section
VCPHSD
ISD
TSD
Shutdown voltage
Shutdown current
Thermal shutdown(2)
VRT = 0 after run mode
2.6 V
250 450 μA
165 °C
MOSFET Section
ILKMOS
RON
ISAT
MOSFET leakage current
On resistance (dynamic)
Saturation current(2)
VDS = 500V
VGS = 12V, ID = 100mA
VGS = 12V, ID = 500mA
VGS = 12V, VDS = 30V
10 μA
6.2
6.5 Ω
800 mA
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
5 Page 
3.3 Running Mode and Active Zero-Voltage
Switching (AZVS) Mode (t2~)
When CPH voltage exceeds 5V, the operating frequency
is fixed to fOSC by RT. However, active ZVS operation is
not activated until CPH reaches ~6V. The FAN7710
prepares for active ZVS operation from the instant CPH
exceeds 5V during t2 to t3. When CPH becomes higher
than ~6V at t3, the active ZVS operation is activated. To
determine the switching condition, FAN7710 detects the
transition time of the output (VOUT pin) of the inverter by
using the VB pin. From the output-transition information,
FAN7710 controls the dead time to meet the ZVS
condition. If ZVS is satisfied, the FAN7710 slightly
increases the CPH voltage to reduce the dead time and
to find optimal dead time, which increases the efficiency
and decreases the thermal dissipation and EMI of the
inverter switches. If ZVS fails, the FAN7710 decreases
CPH voltage to increase the dead time. CPH voltage is
adjusted to meet optimal ZVS operation. During the
active ZVS mode, the amount of the charging/
discharging current is the same as IPH. Figure 23 depicts
normal operation waveforms.
3.4 Shutdown Mode
If the voltage of capacitor CPH is decreased below
~2.6V by an external application circuit or internal
protection circuit, the IC enters shutdown mode. Once
the IC enters shutdown mode, this status continues until
an internal latch is reset by decreasing VDD below
VDDTH(ST-). Figure 24 shows an example of external
shutdown control circuit.
Shutdown
3 CPH
Q1 CPH
FAN7710
4 SGND
FAN7710 Rev. 1.00
Figure 24. External Shutdown Circuit
The amount of the CPH charging current is the same as
IPH, making it possible to shut off the IC using small
signal transistor. FAN7710 provides active ZVS
operation by controlling the dead time according to the
voltage of CPH. If ZVS fails even at the maximum dead
time, FAN7710 stops driving the inverter.
The FAN7710 thermal shutdown circuit senses the
junction temperature of the IC. If the temperature
exceeds ~160°C, the thermal shutdown circuit stops
operation of the FAN7710.
The current usages of shutdown mode and under-
voltage lockout status are different. In shutdown mode,
some circuit blocks, such as bias circuits, are kept alive.
Therefore, the current consumption is slightly higher
than during under-voltage lockout.
Figure 23. Typical Transient Waveform from
Preheating to Active ZVS Mode
4. Automatic Open-Lamp Detection
The FAN7710 can automatically detect an open-lamp
condition. When the lamp is opened, the resonant tank
fails to make a closed-loop to the ground, as shown in
Figure 25. The supplied current from the OUT pin is used
to charge and discharge the charge pump capacitor, CP.
Since the open-lamp condition means resonant tank
absence, it is impossible to meet ZVS condition. In this
condition, the power dissipation of the FAN7710, due to
capacitive load drive, is estimated as:
Pdissipation
=
1
2
× CP
×VDC2
×
f
[W ]
(EQ 6)
where f is driving frequency and VDC is DC-link voltage.
© 2007 Fairchild Semiconductor Corporation
FAN7710 Rev. 1.0.2
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet FAN7710.PDF ] | |
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