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to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON
Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON
Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA
Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended
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FL6961
Single-Stage Flyback and Boundary Mode PFC
Controller for Lighting
Features
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.
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
Applications
General LED Lighting
Industrial, Commercial and Residential Fixtures
Outdoor Lighting: Street, Roadway, Parking,
Construction, and Ornamental LED Lighting
Ordering Information
Part Number
Operating Temperature
Range
FL6961MY
-40°C to +125°C
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
Package
8-Pin, Small Outline Package (SOP)
Packing Method
Tape & Reel
www.fairchildsemi.com
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
January 2012
Figure 1.
Figure 2.
Typical Application Circuit for Step-up Converter
Typical Application Circuit for Single Stage PFC Converter
Block Diagram
MOT
COMP
3
2
2.65V
OVP
2.75V
2.3V
0.45V
INV 1
4
LEB
2.5V
SAWTOOTH
GENERATOR
VCC
8
VOLTAGE
REGULATOR
CS
VLIMIT
THD
OPTIMIZATION
Internal
Supply
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Application Diagram
VREF
VCC
UVLO
9R
R
Q
INHIBIT
TIMER
2.1V/1.75V
1R
VZCDHYS = 0.35V
2.75V
VCC_ON = 12V
VCC_OFF= 9.5V
S
16.5V
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
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
FL6961
TPM
Figure 4. Marking Information
Pin Configuration
Figure 5.
Pin Configuration (Top View)
Pin Definitions
Pin #
Name
Description
1
INV
2
COMP
3
MOT
4
CS
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 cycleby-cycle current limiting.
5
ZCD
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.
6
GND
Ground. The power ground and signal ground. Placing a 0.1µF decoupling capacitor between
VCC and GND is recommended.
7
GATE
Driver Output. Totem-pole driver output to drive the external power MOSFET. The clamped gate
output voltage is 16.5V.
8
VCC
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.
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Marking Information
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.
Power Supply. Driver and control circuit supply voltage.
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
www.fairchildsemi.com
3
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
Parameter
VVCC
DC Supply Voltage
VHIGH
Gate Driver
Min.
-0.3
Max.
Unit
30
V
30.0
V
VLOW
Others (INV, COMP, MOT, CS)
-0.3
7.0
V
VZCD
Input Voltage to ZCD Pin
-0.3
12.0
V
660
mW
+150
C
PD
Power Dissipation
TJ
Operating Junction Temperature
θJA
Thermal Resistance (Junction-to-Air)
150
C/W
θJC
Thermal Resistance (Junction-to-Case)
39
C/W
+150
C
TSTG
TL
ESD
-40
Storage Temperature Range
-65
+230
C
Human Body Model: JESD22-A114
2.5
KV
Machine Model: JESD22-A115
200
V
Lead Temperature (Wave Soldering or IR, 10 Seconds)
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
TA
Parameter
Min.
Operating Ambient Temperature
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
-40
Typ.
Max.
Unit
+125
C
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Absolute Maximum Ratings
www.fairchildsemi.com
4
Unless otherwise noted, VCC=15V and TJ=-40°C to 150°C. Current is defined as positive into the device and negative
out of the device.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
24.5
V
VCC Section
VCC-OP
Continuous Operation Voltage
VCC-ON
Turn-On Threshold Voltage
11.5
12.5
13.5
V
VCC-OFF
Turn-Off Threshold Voltage
8.5
9.5
10.5
V
ICC-ST
Startup Current
VCC=VCC-ON – 0.16V
10
20
µA
ICC-OP
Operating Supply Current
VCC=12V, VCS=0V,
CL=3nF, fSW=60KHz
4.5
6
mA
27.8
28.8
V
VCC-OVP
VDD Over-Voltage Protection Level
26.8
tD-VCCOVP VDD Over-Voltage Protection Debounce
30
µs
Error Amplifier Section
VREF
Reference Voltage
2.475
Gm
Transconductance
125
VINVH
Clamp High Feedback Voltage
2.65
VINVL
Clamp Low Feedback Voltage
2.25
VOUT HIGH Output High Voltage
VOZ
2.500
2.525
V
μmho
2.70
2.30
V
V
4.8
V
Zero Duty Cycle Output Voltage
1.15
1.25
1.35
V
VINV-OVP
Over-Voltage Protection for INV Input
2.70
2.75
2.80
V
VINV-UVP
Under-Voltage Protection for INV Input
0.40
0.45
0.50
V
VINV=2.35V, VCOMP=1.5V
10
20
VINV=1.5V
550
800
VINV=2.65V, VCOMP=5V
10
20
0.77
0.82
ICOMP
Source Current
Sink Current
μA
Current-Sense Section
VPK
Threshold Voltage for Peak Current Limit
Cycle-by-Cycle Limit
tPD
Propagation Delay
tLEB
Leading-Edge Blanking Time
0.87
V
200
ns
RMOT=24kΩ, VCOMP=5V
400
500
RMOT=24kΩ,
VCOMP=VOZ+50mV
270
350
16.0
17.5
V
1.4
V
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Electrical Characteristics
ns
Gate Section
VZ-OUT
Output Voltage Maximum (Clamp)
VCC=25V
14.5
VOL
Output Voltage Low
VCC=15V, IO=100mA
VOH
Output Voltage High
VCC=14V, IO=100mA
tR
Rising Time
VCC=12V, CL=3nF,
20~80%
80
ns
tF
Falling Time
VCC=12V, CL=3nF,
80~20%
40
ns
8
V
Continued on the following page…
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
www.fairchildsemi.com
5
Unless otherwise noted, VCC=15V and TJ=-40°C to 150°C. Current is defined as positive into the device and negative
out of the device.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
1.9
2.1
2.3
V
Zero-Current Detection Section
VZCD
HYS of
VZCD
Input Threshold Voltage Rising Edge
VZCD Increasing
Threshold Voltage Hysteresis
VZCD Decreasing
0.35
VZCD-HIGH Upper Clamp Voltage
IZCD=3mA
VZCD-LOW Lower Clamp Voltage
IZCD=-1.5mA
0.3
Maximum Delay, ZCD to Output Turn-On
VCOMP=5V,
fSW=60KHz
100
Restart Time
Output Turned Off by
ZCD
300
tINHIB
Inhibit Time (Maximum Switching
Frequency Limit)
RMOT=24kΩ
VDIS
Disable Threshold Voltage
tDEAD
tRESTART
tZCD-DIS
Disable Function Debounce Time
12
V
V
500
400
ns
700
μs
2.8
130
RMOT=24kΩ,
VZCD=100mV
V
200
μs
250
800
mV
μs
Maximum On Time Section
VMOT
tON-MAX
Maximum On Time Voltage
Maximum On Time Programming
(Resistor Based)
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
1.25
RMOT=24kΩ, VCS=0V,
VCOMP=5V
1.30
25
1.35
V
μs
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Electrical Characteristics
www.fairchildsemi.com
6
3.0
2.515
2.4
I CC-OP (mA)
V ref (V)
2.525
2.505
2.495
2.485
1.8
1.2
0.6
2.475
0.0
-40 -25 -10
5
20
35
50
65
80
95 110 125
-40 -25 -10
Temperature (℃)
20
35
50
65
80
95 110 125
Temperature (℃)
Figure 6. VREF vs. TA
Figure 7. ICC-OP vs. TA
24.60
14.0
24.52
13.4
V th-ON (V)
t ON-MAX (μs)
5
24.44
24.36
24.28
12.8
12.2
11.6
24.20
-40 -25 -10
5
20
35
50
65
80
11.0
95 110 125
-40 -25 -10
5
Temperature (℃)
35
50
65
80
95 110 125
Temperature (℃)
Figure 8. tON-MAX vs. TA
Figure 9. Vth-ON vs. TA
10.5
16.0
10.1
13.6
I CC-ST (μA)
V th-OFF (V)
20
9.7
9.3
8.9
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Typical Performance Characteristics
11.2
8.8
6.4
8.5
4.0
-40 -25 -10
5
20
35
50
65
80
95 110 125
-40 -25 -10
Temperature (℃)
20
35
50
65
80
95 110 125
Temperature (℃)
Figure 10. Vth-OFF vs. TA
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
5
Figure 11. ICC-ST vs. TA
www.fairchildsemi.com
7
18.0
1.330
17.4
V Z-OUT (V)
V MOT (V)
1.350
1.310
1.290
1.270
16.2
15.6
1.250
15.0
-40 -25 -10
5
20
35
50
65
80
95 110 125
-40 -25 -10
Temperature (℃)
0.85
0.83
0.81
0.79
0.77
5
20
35
50
65
80
95 110 125
Temperature (℃)
Figure 14. VPK vs. TA
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
20
35
50
65
Figure 13. VZ-OUT vs. TA
0.87
-40 -25 -10
5
80
Temperature (℃)
Figure 12. VMOT vs. TA
V PK (V)
16.8
95 110 125
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Typical Performance Characteristics (Continued)
www.fairchildsemi.com
8
Error Amplifier
Leading-Edge Blanking (LEB)
The inverting input of the error amplifier is referenced to
INV. The output of the error amplifier is referenced to
COMP. The non-inverting input is internally connected
to a fixed 2.5V ±2% voltage. The output of the error
amplifier is used to determine the on-time of the PWM
output and regulate the output voltage. To achieve a
low input current THD, the variation of the on-time
within one input AC cycle should be very small. A multivector error amplifier is built in to provide fast transient
response and precise output voltage clamping.
Connecting a capacitance, such as 1µF, between
COMP and GND is suggested. The error amplifier is a
trans-conductance amplifier that converts voltage to
current with a 125µmho.
A turn-on spike on the CS pin appears when the power
MOSFET is switched on. At the beginning of each
switching pulse, the current-limit comparator is disabled
for around 400ns to avoid premature termination. The
gate drive output cannot be switched off during the
blanking period. Conventional RC filtering is not
necessary, so the propagation delay of current limit
protection can be minimized.
Under-Voltage Lockout (UVLO)
The turn-on and turn-off threshold voltages are fixed
internally at 12V and 9.5V, respectively. This hysteresis
behavior guarantees a one-shot startup with proper
startup resistor and hold-up capacitor. With an ultra-low
startup current of 20µA, one 1MΩ RIN is sufficient for
startup under low input line voltage, 85Vrms. Power
dissipation on RIN would be less than 0.1W even under
high line (VAC=265Vrms) condition.
Startup Current
Typical startup current is less than 20µA. This ultra-low
startup current allows the usage of a high resistance,
low-wattage startup resistor. For example, 1MΩ/0.25W
startup resistor and a 10µF/25V (VCC hold-up) capacitor
are recommended for an AC-to-DC power adaptor with
a wide input range 85-265VAC.
Output Driver
With low on resistance and high current driving
capability, the output driver can drive an external
capacitive load larger than 3000pF. Cross conduction
current has been avoided to minimize heat dissipation,
improving efficiency and reliability. This output driver is
internally clamped by a 16.5V Zener diode.
Operating Current
Operating current is typically 4.5mA. The low operating
current enables better efficiency and reduces the
requirement of VCC hold-up capacitance.
Zero-Current Detection (ZCD)
The zero-current detection of the inductor is achieved
using its auxiliary winding. When the stored energy of
the inductor is fully released to output, the voltage on
ZCD goes down and a new switching cycle is enabled
after a ZCD trigger. The power MOSFET is always
turned on with zero inductor current such that turn-on
loss and noise can be minimized. The converter works
in Boundary Mode and peak inductor current is always
exactly twice of the average current. A natural power
factor correction function is achieved with the lowbandwidth, on-time modulation. An inherent maximum
off time is built in to ensure proper startup operation.
This ZCD pin can be used as a synchronous input.
Maximum On-Time Operation
Given a fixed inductor value and maximum output
power, the relationship between on-time and line
voltage is:
t on
2 L Po
(1)
Vrms 2
If the line voltage is too low or the inductor value is too
high, tON is too long. To avoid extra low operating
frequency and achieve brownout protection, the
maximum value of tON is programmable by one resistor,
RI, connected between MOT and GND. A 24kΩ resistor
RI generates corresponds to 25µs maximum on time:
t on (max) RI ( k )
25
s
24
Noise Immunity
Noise on the current sense or control signal can cause
significant pulse-width jitter, particularly in Boundary
Mode. Slope compensation and a built-in debounce
circuit can alleviate this problem. Because the FL6961
has a single ground pin, high sink current at the output
cannot be returned separately. Good high-frequency or
RF layout practices should be followed. Avoiding long
PCB traces and component leads, locating
compensation and filter components near to the
FL6961, and increasing the power MOSFET gate
resistance all improve performance.
(2)
The range of the maximum on-time is 10 ~ 50µs.
Peak Current Limiting
The switch current is sensed by one resistor. The signal
is fed into the CS pin and an input terminal of a
comparator. A high voltage on the CS pin terminates
the switching cycle immediately and cycle-by-cycle
current limit is achieved. The designed threshold of the
protection point is 0.82V.
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Functional Description
www.fairchildsemi.com
9
5.00
4.80
A
0.65
3.81
5
8
B
6.20
5.80
PIN ONE
INDICATOR
1.75
4.00
3.80
1
5.60
4
1.27
(0.33)
0.25
M
1.27
C B A
LAND PATTERN RECOMMENDATION
0.25
0.10
SEE DETAIL A
1.75 MAX
0.25
0.19
C
0.10
0.51
0.33
0.50 x 45°
0.25
R0.10
C
OPTION A - BEVEL EDGE
GAGE PLANE
R0.10
OPTION B - NO BEVEL EDGE
0.36
NOTES: UNLESS OTHERWISE SPECIFIED
8°
0°
0.90
0.406
A) THIS PACKAGE CONFORMS TO JEDEC
MS-012, VARIATION AA, ISSUE C,
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS DO NOT INCLUDE MOLD
FLASH OR BURRS.
D) LANDPATTERN STANDARD: SOIC127P600X175-8M.
E) DRAWING FILENAME: M08AREV13
SEATING PLANE
(1.04)
DETAIL A
SCALE: 2:1
Figure 15.
8-Lead, SOIC, JEDEC MS-012, .150 Inch Narrow Body
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
www.fairchildsemi.com
10
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
Physical Dimensions
FL6961 — Single-Stage Flyback and Boundary Mode PFC Controller for Lighting
© 2010 Fairchild Semiconductor Corporation
FL6961 • Rev. 1.0.2
www.fairchildsemi.com
11
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ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
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