FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
January 2012
FL6961
Single-Stage Flyback and Boundary Mode PFC
Controller for Lighting
Features
Boundary Mode PFC Controller
Low Input Current THD
Controlled On-Time PWM
Zero-Current Detection
Cycle-by-Cycle Current Limiting
Leading-Edge Blanking Instead of RC Filtering
Low Startup Current: 10µA Typical
Low Operating Current: 4.5mA Typical
Feedback Open-Loop Protection
Programmable Maximum On-Time (MOT)
Output Over-Voltage Clamping Protection
Clamped Gate Output Voltage: 16.5V
Description
The FL6961 is a general lighting power controller for
low- to high-power lumens applications requiring power
factor correction. It is designed for flyback or boost
converter operating in Boundary Mode.
The FL6961 provides a controlled on-time to regulate
the output DC voltage and achieves natural power factor
correction (PFC). The maximum on-time of the external
switch is programmable to ensure safe operation during
AC brownouts. An innovative multi-vector error amplifier
provides rapid transient response and precise output
voltage clamping. A built-in circuit disables the controller
if the output feedback loop is opened. The startup
current is lower than 20µA and the operating current is
less than 6mA. The supply voltage can be up to 25V,
maximizing application flexibility.
Applications
General LED Lighting
Industrial, Commercial and Residential Fixtures
Outdoor Lighting: Street, Roadway, Parking,
Construction, and Ornamental LED Lighting
Ordering Information
Part Number
FL6961MY
Operating Temperature
Range
-40°C to +125°C
Package
8-Pin, Small Outline Package (SOP)
Packing Method
Tape & Reel
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
www.fairchildsemi.com
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Application Diagram
Figure 1.
Typical Application Circuit for Step-up Converter
Figure 2.
Typical Application Circuit for Single Stage PFC Converter
Block Diagram
MOT
3
2.65V
COMP
2
OVP
2.75V
2.3V
0.45V
INV 1
2.5V
LEB
4
CS
SAWTOOTH
GENERATOR
THD
OPTIMIZATION
V
LIMIT
V
CC
8
VOLTAGE
REGULATOR
Internal
Supply
V
REF
V
CC
UVLO
9R
R
Q
2.1V/1.75V
INHIBIT
TIMER
V
ZCDHYS
= 0.35V
S
16.5V
1R
2.75V
V
CC_ON
= 12V
V
CC_OFF
= 9.5V
7 GATE
DISABLE
GND 6
10V
5
ZCD
Figure 3. Function Block Diagram
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
www.fairchildsemi.com
2
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Marking Information
F-
Fairchild Logo
Z- Plant Code
X- Year Code
Y- Week Code
TT: Die Run Code
T: Package Type (M=SOP)
P: Z: Pb Free
Y: Green Compound
M: Manufacture Flow Code
Figure 4. Marking Information
FL6961
TPM
Pin Configuration
Figure 5.
Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
Name
INV
COMP
MOT
Description
Inverting Input of the Error Amplifier.
INV is connected to the converter output via a resistive
divider. This pin is also used for over-voltage clamping and open-loop feedback protection.
Output of the Error Amplifier.
To create a precise clamping protection, a compensation network
between this pin and GND is suggested.
Maximum On Time.
A resistor from MOT to GND is used to determine the maximum on-time of
the external power MOSFET. The maximum output power of the converter is a function of the
maximum on-time.
Current Sense.
Input to the over-current protection comparator. When the sensed voltage across
the sense resistor reaches the internal threshold (0.8V), the switch is turned off to activate cycle-
by-cycle current limiting.
Zero-Current Detection.
This pin is connected to an auxiliary winding via a resistor to detect the
zero crossing of the switch current. When the zero crossing is detected, a new switching cycle is
started. If it is connected to GND, the device is disabled.
Ground.
The power ground and signal ground. Placing a 0.1µF decoupling capacitor between
V
CC
and GND is recommended.
Driver Output.
Totem-pole driver output to drive the external power MOSFET. The clamped gate
output voltage is 16.5V.
Power Supply.
Driver and control circuit supply voltage.
4
CS
5
6
7
8
ZCD
GND
GATE
V
CC
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
www.fairchildsemi.com
3
FL6961 — 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. All voltage values, except differential voltage, are given with
respect to GND pin.
Symbol
V
VCC
V
HIGH
V
LOW
V
ZCD
P
D
T
J
θ
JA
θ
JC
T
STG
T
L
ESD
DC Supply Voltage
Gate Driver
Parameter
Min.
-0.3
-0.3
-0.3
-40
Max.
30
30.0
7.0
12.0
660
+150
150
39
Unit
V
V
V
V
mW
C
C/W
C/W
C
C
KV
V
Others (INV, COMP, MOT, CS)
Input Voltage to ZCD Pin
Power Dissipation
Operating Junction Temperature
Thermal Resistance (Junction-to-Air)
Thermal Resistance (Junction-to-Case)
Storage Temperature Range
Lead Temperature (Wave Soldering or IR, 10 Seconds)
Human Body Model: JESD22-A114
Machine Model: JESD22-A115
-65
+150
+230
2.5
200
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
T
A
Parameter
Operating Ambient Temperature
Min.
-40
Typ.
Max.
+125
Unit
C
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
www.fairchildsemi.com
4
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Electrical Characteristics
Unless otherwise noted, V
CC
=15V and T
J
=-40°C to 150°C. Current is defined as positive into the device and negative
out of the device.
Symbol
V
CC
Section
V
CC-OP
V
CC-ON
V
CC-OFF
I
CC-ST
I
CC-OP
V
CC-OVP
Parameter
Continuous Operation Voltage
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
Startup Current
Operating Supply Current
V
DD
Over-Voltage Protection Level
Conditions
Min.
Typ.
Max.
24.5
Units
V
V
V
µA
mA
V
µs
11.5
8.5
V
CC
=V
CC-ON
– 0.16V
V
CC
=12V, V
CS
=0V,
C
L
=3nF, f
SW
=60KHz
26.8
12.5
9.5
10
4.5
27.8
30
13.5
10.5
20
6
28.8
t
D-VCCOVP
V
DD
Over-Voltage Protection Debounce
Error Amplifier Section
V
REF
Gm
V
INVH
V
INVL
Reference Voltage
Transconductance
Clamp High Feedback Voltage
Clamp Low Feedback Voltage
2.25
4.8
1.15
2.70
0.40
V
INV
=2.35V, V
COMP
=1.5V
V
INV
=1.5V
V
INV
=2.65V, V
COMP
=5V
10
550
10
2.475
2.500
125
2.65
2.30
2.525
V
μmho
2.70
V
V
V
V
OUT HIGH
Output High Voltage
V
OZ
V
INV-OVP
V
INV-UVP
Zero Duty Cycle Output Voltage
Over-Voltage Protection for INV Input
Under-Voltage Protection for INV Input
Source Current
Sink Current
Current-Sense Section
V
PK
t
PD
t
LEB
Threshold Voltage for Peak Current Limit
Cycle-by-Cycle Limit
Propagation Delay
R
MOT
=24kΩ, V
COMP
=5V
Leading-Edge Blanking Time
R
MOT
=24kΩ,
V
COMP
=V
OZ
+50mV
1.25
2.75
0.45
20
800
20
1.35
2.80
0.50
V
V
V
I
COMP
μA
0.77
0.82
0.87
200
V
ns
ns
400
270
500
350
Gate Section
V
Z
-
OUT
V
OL
V
OH
t
R
t
F
Output Voltage Maximum (Clamp)
Output Voltage Low
Output Voltage High
Rising Time
Falling Time
V
CC
=25V
V
CC
=15V, I
O
=100mA
V
CC
=14V, I
O
=100mA
V
CC
=12V, C
L
=3nF,
20~80%
V
CC
=12V, C
L
=3nF,
80~20%
8
80
40
14.5
16.0
17.5
1.4
V
V
V
ns
ns
Continued on the following page…
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
www.fairchildsemi.com
5
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