FL7930 — Single-Stage Flyback and Boundary-Mode PFC Controller for Lighting
March 2011
FL7930
Single-Stage Flyback and Boundary-Mode PFC
Controller for Lighting
Features
Additional PFC-Ready Function (FL7930C Only)
Input-Voltage-Absent-Detection Circuit
Maximum Switching Frequency Limitation
Internal Soft-Start with Overshoot Prevention
Internal Total Harmonic Distortion (THD) Optimizer
Precise Adjustable Output Over-Voltage Protection
Additional OVP Detection Pin (FL7930B Only)
Open-Feedback Protection and Disable Function
Zero-Current Detector
150µs Internal Startup Timer
MOSFET Over-Current Protection (OCP)
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)
Description
The FL7930 is an active Power Factor Correction (PFC)
controller for low-to high-power lumens 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.
FL7930 provides over-voltage, open-feedback, over-
current, input-voltage-absent detection, and under-
voltage lockout protections. The FL7930 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.
The FL3930B provides an additional OVP pin that can
be used to shut down the boost power stage when
output voltage exceeds OVP level due to damaged
resistors connected at the INV pin. The FL7930C
provides a PFC-ready pin can be used to trigger other
power stages when PFC output voltage reaches the
proper level (with hysteresis).
Applications
Ballast
General LED Lighting
Industrial, Commercial, and Residential Fixtures
Outdoor Lighting: Street, Roadway, Parking,
Construction and Ornamental LED Lighting Fixtures
Ordering Information
Part Number
FL7930BM
FL7930BMX
FL7930CM
FL7930CMX
© 2011 Fairchild Semiconductor Corporation
FL7930 • Rev. 1.0.0
Operating
Temperature Range
Top Mark
FL7930B
Package
Packing
Method
Rail
Tape & Reel
Rail
Tape & Reel
www.fairchildsemi.com
-40 to +125°C
FL7930C
8-Lead Small Outline Package (SOP)
FL7930 — Single-Stage Flyback and Boundary-Mode PFC Controller for Lighting
Application Diagrams
Figure 1. Typical Boost PFC Application for FL7930B
FL7930B
1 INV
C
F1
C
F2
C
HF
2 OVP
3 COMP
4 CS
VCC 8
GATE 7
GND 6
ZCD 5
Figure 2. Typical Application of Single-Stage Flyback Converter for FL7930B
DC OUTPUT
V
CC
Line Filter
AC INPUT
PFC
Ready
FL7930C
8
5
3
2
V
CC
ZCD
COMP
RDY
GND
Out
CS
INV
7
4
1
6
Figure 3. Typical Boost PFC Application for FL7930C
© 2011 Fairchild Semiconductor Corporation
FL7930 • Rev. 1.0.0
www.fairchildsemi.com
2
FL7930 — Single-Stage Flyback and Boundary-Mode PFC Controller for Lighting
Internal Block Diagram
Figure 4. Functional Block Diagram for FL7930B
Figure 5. Functional Block Diagram for FL7930C
© 2011 Fairchild Semiconductor Corporation
FL7930 • Rev. 1.0.0
www.fairchildsemi.com
3
FL7930 — Single-Stage Flyback and Boundary-Mode PFC Controller for Lighting
Pin Configuration
Figure 6. Pin Configurations (Top View)
Pin Definitions
Pin #
1
Name
INV
OVP
Description
This pin is the inverting input of the error amplifier. The output voltage of the boost PFC
converter should be resistively divided to 2.5V.
FL7930B:
This pin is used to detect PFC output over-voltage when INV pin information is not
correct.
FL7930C:
This pin is used to detect PFC output-voltage reaching a pre-determined value.
When output voltage reaches 89% of rated output voltage, this pin is pulled HIGH, which is an
(open-drain) output type.
This pin is the output of the transconductance error amplifier. Components for the output
voltage compensation should be connected between this pin and GND.
This pin is the input of the over-current protection comparator. The MOSFET current is sensed
using a sensing resistor and the resulting voltage is applied to this pin. An internal RC filter is
included to filter switching noise.
This pin is the input of the zero-current detection block. If the voltage of this pin goes higher
than 1.5V, then goes lower than 1.4V, the MOSFET is turned on.
This pin is used for the ground potential of all the pins. For proper operation, the signal ground
and the power ground should be separated.
This pin is the gate drive output. The peak sourcing and sinking current levels are +500mA
and -800mA, respectively. For proper operation, the stray inductance in the gate driving path
must be minimized.
This is the IC supply pin. IC current and MOSFET drive current are supplied using this pin.
2
RDY
3
4
5
6
7
8
COMP
CS
ZCD
GND
OUT
VCC
© 2011 Fairchild Semiconductor Corporation
FL7930 • Rev. 1.0.0
www.fairchildsemi.com
4
FL7930 — Single-Stage Flyback and Boundary-Mode PFC Controller for Lighting
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.
Symbol
V
CC
I
OH
, I
OL
I
CLAMP
I
DET
V
IN
T
J
T
A
T
STG
ESD
Supply Voltage
Peak Drive Output Current
Parameter
Min.
-800
-10
-10
-0.3
-10
-40
-65
Max.
V
Z
+500
+10
+10
8.0
6
+150
+125
+150
2.5
2.0
Unit
V
mA
mA
mA
V
°C
°C
°C
KV
Driver Output Clamping Diodes V
O
>V
CC
or V
O
<-0.3V
Detector Clamping Diodes
Error Amplifier Input, Output, OVP Input, ZCD, RDY, and OVP Pins
(1)
CS Input Voltage
(2)
Operating Junction Temperature
Operating Temperature Range
Storage Temperature Range
Electrostatic Discharge
Capability
Human Body Model, JESD22-A114
Charged Device Model, JESD22-C101
Notes:
1. When this pin is supplied by external power sources by accident, its maximum allowable current is 50mA.
2. In case of DC input, acceptable input range is -0.3V~6V: within 100ns -10V~6V is acceptable, but electrical
specifications are not guaranteed during such a short time.
Thermal Impedance
Symbol
JA
Parameter
Thermal Resistance, Junction-to-Ambient
(3)
Min.
150
Max.
Unit
°C/W
Note:
3. Regarding the test environment and PCB type, please refer to JESD51-2 and JESD51-10.
© 2011 Fairchild Semiconductor Corporation
FL7930 • Rev. 1.0.0
www.fairchildsemi.com
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