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Número de pieza | FAN7930B | |
Descripción | Critical Conduction Mode PFC Controller | |
Fabricantes | Fairchild Semiconductor | |
Logotipo | ||
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FAN7930B
Critical Conduction Mode PFC Controller
Features
Additional OVP Detection Pin
Input Voltage Absent Detection Circuit
Maximum Switching Frequency Limitation
Internal Soft-Start and Overshoot-less Control
Internal Total Harmonic Distortion (THD) Optimizer
Precise Adjustable Output Over-Voltage Protection
Open-Feedback Protection and Disable Function
Zero Current Detector
150μs Internal Startup Timer
MOSFET Over-Current Protection
Under-Voltage Lockout with 3.5V Hysteresis
Low Startup and Operating Current
Totem-Pole Output with High State Clamp
+500/-800mA Peak Gate Drive Current
8-Pin Small Outline Package (SOP)
Applications
Adapter
Ballast
LCD TV, CRT TV
SMPS
Description
The FAN7930B is an active power factor correction
(PFC) controller for boost PFC applications that
operate in critical conduction mode (CRM). It uses a
voltage-mode PWM that compares an internal ramp
signal with the error amplifier output to generate a
MOSFET turn-off signal. Because the voltage-mode
CRM PFC controller does not need rectified AC line
voltage information, it saves the power loss of an input
voltage sensing network necessary for a current-mode
CRM PFC controller.
FAN7930B provides over-voltage protection, open-
feedback protection, over-current protection, input-
voltage-absent detection, and under-voltage lockout
protection. The additional OVP pin can be used to shut
down the boost power stage when output voltage
exceeds OVP level due to the resistors that are
connected at INV pin are damaged. The FAN7930B can
be disabled if the INV pin voltage is lower than 0.45V
and the operating current decreases to a very low level.
Using a new variable on-time control method, THD is
lower than the conventional CRM boost PFC ICs.
Related Resources
AN-8035 — Design Consideration for Boundary
Conduction Mode PFC Using FAN7930
Ordering Information
Part Number
Operating
Temperature
Range
www.DataSheFetA4NU7.c9o3m0BM
FAN7930BMX
-40 to +125°C
Top Mark
Package
FAN7930B 8-Lead Small Outline Package (SOP)
Packing
Method
Rail
Tape & Reel
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.2
www.fairchildsemi.com
1 page Electrical Characteristics
VCC = 14V, TA = -40°C~+125°C, unless otherwise specified.
Symbol
Parameter
Conditions
VCC Section
VSTART Start Threshold Voltage
VSTOP Stop Threshold Voltage
HYUVLO UVLO Hysteresis
VZ Zener Voltage
VOP Recommended Operating Range
Supply Current Section
VCC Increasing
VCC Decreasing
ICC=20mA
ISTART
Startup Supply Current
IOP Operating Supply Current
IDOP Dynamic Operating Supply Current
IOPDIS
Operating Current at Disable
Error Amplifier Section
VCC=VSTART-0.2V
Output Not Switching
50kHZ, CI=1nF
VINV=0V
VREF1
ΔVREF1
ΔVREF2
IEA,BS
Voltage Feedback Input Threshold1 TA=25°C
Line Regulation
Temperature Stability of VREF1(4)
VCC=14V~20V
Input Bias Current
VINV=1V~4V
IEAS,SR Output Source Current
VINV=VREF -0.1V
IEAS,SK Output Sink Current
VINV=VREF +0.1V
VEAH
Output Upper Clamp Voltage
VINV=1V, VCS=0V
VEAZ
gm
Zero Duty Cycle Output Voltage
Transconductance(4)
Maximum On-Time Section
tON,MAX1 Maximum On-Time Programming 1 TA=25°C, VZCD=1V
tON,MAX2
Maximum On-Time Programming 2
TA=25°C,
IZCD=0.469mA
Current-Sense Section
VCS
Current Sense Input Threshold
Voltage Limit
ICS,BS
tCS,D
Input Bias Current
Current Sense Delay to Output(4)
VCS=0V~1V
dV/dt=1V/100ns, from
0V to 5V
Min.
11
7.5
3.0
20
13
90
2.465
-0.5
6.0
0.9
90
35.5
11.2
0.7
-1.0
Typ. Max. Units
12 13 V
8.5 9.5 V
3.5 4.0 V
22 24 V
20 V
120 190 µA
1.5 3.0 mA
2.5 4.0 mA
160 230 µA
2.500
0.1
20
-12
12
6.5
1.0
115
2.535
10.0
0.5
7.0
1.1
140
V
mV
mV
µA
µA
µA
V
V
µmho
41.5 47.5 µs
13.0 14.8 µs
0.8 0.9 V
-0.1 1.0 µA
350 500 ns
Continued on the following page…
www.DataSheet4U.com
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.2
5
www.fairchildsemi.com
5 Page Applications Information
1. Startup: Normally, supply voltage (VCC) of a PFC
block is fed from the additional power supply, which can
be called standby power. Without this standby power,
auxiliary winding to detect zero current detection can be
used as a supply source. Once the supply voltage of the
PFC block exceeds 12V, internal operation is enabled
until the voltage drops to 8.5V. If VCC exceeds VZ, 20mA
current is sinking from VCC.
Figure 23. Circuit Around INV Pin
Figure 22. Startup Circuit
2. INV Block: Scaled-down voltage from the output is
the input for the INV pin. Many functions are embedded
based on the INV pin: transconductance amplifier,
output OVP comparator and disable comparator.
For the output voltage control, a transconductance
amplifier is used instead of the conventional voltage
amplifier. The transconductance amplifier (voltage-
controlled current source) aids the implementation of
OVP and disables function. The output current of the
amplifier changes according to the voltage difference of
the inverting and non-inverting input of the amplifier. To
cancel down the line input voltage effect on power factor
correction, effective control response of PFC block
should be slower than the line frequency and these
conflicts with the transient response of controller. Two-
pole one-zero type compensation may be used to meet
both requirements.
The OVP comparator shuts down the output drive block
when the voltage of the INV pin is higher than 2.675V
and there is 0.175V hysteresis. The disable comparator
disables the operation when the voltage of the inverting
input is lower than 0.35V and there is 100mV hysteresis.
An external small-signal MOSFET can be used to
disable the IC. The IC operating current decreases to
reduce power consumption if the IC is disabled. 0 is the
www.DatatrSiamhteeinedgt4PUcFh.Ccaorotmuotfptuhtevoinltteagrneailscairscsuuitmneedaratth3e90INVVDCpainndwhVeCnC
supply voltage is 15V.
Figure 24. Timing Chart for INV Block
3. OVP Pin: Over-Voltage Protection (OVP) is
embedded by the information at the INV pin. That
information comes from the output through the voltage
dividing resistors. To scale down from high voltage to
low one, high resistance normally used with low
resistance. In cases the resistor of high resistance get a
damage and resistance is changed to high, though INV
pin information is normal output voltage exceeds its
rated output. Once this happen, output electrolytic
capacitor may be exploded. To prevent such a
catastrophe additional OVP pin is assigned to double
check output voltage. Thus additional OVP may be
called 2nd OVP while INV pin OVP can be called 1st
OVP.
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.2
11
www.fairchildsemi.com
11 Page |
Páginas | Total 22 Páginas | |
PDF Descargar | [ Datasheet FAN7930B.PDF ] |
Número de pieza | Descripción | Fabricantes |
FAN7930 | Critical Conduction Mode PFC Controller | Fairchild Semiconductor |
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