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FLS3217 / FLS3247
Single-Stage PFC Primary-Side-Regulation Offline
LED Driver with Integrated Power MOSFET
Features
Description
Cost-Effective Solution without Input Bulk Capacitor
and Feedback Circuitry
Power-Factor Correction (PFC)
This highly integrated PWM controller with power
MOSFET, FLS3217 / FLS3247, provides several
features to enhance the performance of low-power
flyback converters. The proprietary topology enables
simplified circuit design for LED lighting applications.
Linear Frequency Control for Increased Efficiency
Application Voltage Range: 80 VAC ~ 308 VAC
Integrated Power MOSFET
Accurate Constant-Current (CC) Control
Independent Online Voltage, Output Voltage, and
Magnetizing Inductance Variation
Open / Short-LED Protection
Cycle-by-Cycle Current Limiting
Over-Temperature Protection with Auto Restart
Low Startup Current: 20μA
Low Operating Current: 5mA
VDD Over-Voltage Protection (OVP)
VDD Under-Voltage Lockout (UVLO)
By using the single-stage topology with primary-side
regulation, an LED lighting board can be implemented
with the few external components and minimized cost;
requiring no input bulk capacitor or feedback circuitry.
To implement good power factor and low THD, constant
on-time control is utilized with an external capacitor
connected to COMI.
Precise constant-current control regulates accurate
output current versus changes in input voltage and
output voltage. The operating frequency is proportionally
changed by the output voltage to guarantee DCM
operation with higher efficiency and simple design.
FLS3217 and FLS3247 provide protection features such
as open-LED, short-LED, and over-temperature
protection. The current-limit level is automatically
reduced to minimize the output current and protect
external components in short-LED condition.
Applications
LED Lighting System
Ordering Information
Part Number
Operating
Temperature Range
FLS3217M
FLS3217N
Package
7-Lead, Small Outline Package (SOIC)
-40°C to +125°C
FLS3247N
7-Lead, Small Outline Package (DIP)
Packing Method
Tape & Reel
Tube
.
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
www.fairchildsemi.com
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
July 2014
BRIDGE DIODE
TRANS
LINE INPUT
FUSE
DRAIN 7
2 VDD
NC 6
5 COMI
VS 4
3 GND
CS 1
Figure 1.
Typical Application
Internal Block Diagram
DRAIN
7
Internal
Bias
Shutdown
Max. Duty
Controller
VDD Good
VDD 2
VOVP
Gate
Driver
+
S
Q
-
+
OCP Level
Controller
R
+
S
Q
LEB
-
R
TSD
VOCP
-
OSC
VS
Sawtooth
Generator
+
VDD Good
NC
5 COMI
6
GND 3
TRUECURRENT®
Calculation
VREF
Freq.
Sample & Hold
VS
Figure 2.
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
Error
Amp.
tDIS
Detector
+
DCM Frequency
Controller
Auto Restart Protection:
OVP (Over-Voltage Protection)
UVLO (Under-Voltage Lockout)
OTP (Over-Temperature Protection)
1 CS
Functional Block Diagram
4 VS
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Application Diagram
www.fairchildsemi.com
2
ZXYTT
S3217
TM
F: Fairchild Logo
Z: Plant Code
X: 1-Digit Year Code
Y: 1-Digit Week Code
TT: 2-Digit Die Run Code
T: Package Type (M=SOIC, N=DIP)
M: Manufacture Flow Code
ZXYTT
S3247
TM
Figure 3.
Top Mark
Pin Configuration
Figure 4.
Pin Configuration
Pin Definitions
Pin #
Name
Description
1
CS
Current Sense. This pin connects a current-sense resistor to detect the MOSFET current for
the output-current regulation in Constant-Current (CC) regulation.
2
VDD
Power Supply. IC operating current and MOSFET driving current are supplied using this pin.
3
GND
Ground
4
VS
5
COMI
6
NC
7
DRAIN
Voltage Sense. This pin detects the output voltage information and discharge time for
maximum frequency control and constant current regulation. This pin is connected to an
auxiliary winding of the transformer via resistors of the divider.
Constant Current Loop Compensation. This pin is connected to a capacitor between the
COMI and GND pins for compensation current loop gain.
No Connect
Power MOSFET Drain. This pin is the high-voltage power MOSFET drain.
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Marking Information
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.
Symbol
Parameter
Min.
(1,2)
Max.
Unit
30
V
VVDD
DC Supply Voltage
VVS
VS Pin Input Voltage
-0.3
7.0
V
VCS
CS Pin Input Voltage
-0.3
7.0
V
COMI Pin Input Voltage
-0.3
7.0
V
VCOMI
ID
Continuous Drain Current
IDM
Pulsed Drain Current
IAR
Avalanche Current
PD
Power Dissipation
ΘJA
Thermal Resistance (Junction-to-Air)
ΘJC
Thermal Resistance (Junction-to-Case)
TJ
TSTG
TL
ESD
TA=25°C,
FLS3217M/N
1
TA=25°C, FLS3247N
4
FLS3217M/N
4
FLS3247N
16
FLS3217M/N
-
FLS3247N
1
4
SOIC, TA＜50°C
DIP, TA＜50°C
1
W
DIP, TA＜50°C
95
SOIC, TA＜50°C
40
DIP, TA＜50°C
25
+150
-55
Lead Temperature (Soldering 10 seconds)
A
mW
150
Storage Temperature Range
A
660
SOIC, TA＜50°C
Maximum Junction Temperature
A
°C/W
°C/W
°C
+150
°C
+260
°C
ESD Capability, Human Body Model
5
ESD Capability, Charged Device Model
2
V
Notes:
1. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.
2. All voltage values, except differential voltages, are given with respect to GND pin.
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
Operating Ambient Temperature
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
Min.
Max.
Unit
-40
125
°C
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Absolute Maximum Ratings
www.fairchildsemi.com
4
Unless otherwise specified, VDD=15 V and TA=25°C.
Symbol
Parameter
Condition
Min.
ID=250 µA, VGS=0 V
700
Typ.
Max.
Unit
MOSFET Section
BVDSS
Drain-Source Breakdown Voltage
RDS(ON)
FLS3217M
Static Drain-Source
FLS3217N
On Resistance
FLS3247N
FLS3217M
CISS
Input Capacitance
FLS3217N
FLS3247N
FLS3217M
COSS
Output Capacitance FLS3217N
FLS3247N
ID=0.5 A, VGS=10 V
ID=1 A, VGS=10 V
VGS=0 V, VDS=25 V,
fS=1 MHz
V
13
16
Ω
8.8
11.0
Ω
2.4
2.8
Ω
175
200
pF
250
pF
435
pF
23
VGS=0V, VDS=25V,
fS=1MHz
25
pF
25
pF
51
pF
VDD Section
VDD-ON
Turn-On Threshold Voltage
14.5
16.0
17.5
V
VDD-OFF
Turn-Off Threshold Voltage
6.75
7.75
8.75
V
2.85
4.00
5.00
mA
2
20
μA
22.0
23.5
25.0
V
IDD-OP
Operating Current
IDD-ST
Startup Current
VOVP
VDD Over-Voltage Protection Level
VS=2.4 V, CL=MOSFET
CISS
VDD=VDD-ON – 0.16 V
Oscillator Section
fMAX-CC
Maximum Frequency in CC
VDD=10 V, 20 V
60
65
70
kHz
fMIN-CC
Minimum Frequency in CC
VDD=10 V, 20 V
21.0
23.5
26.0
kHz
VSMAX-CC
VS for Maximum Frequency in CC
Frequency=Maximum
Frequency-2 kHz
2.25
2.35
2.45
V
VSMIN-CC
VS for Minimum Frequency in CC
Frequency=Minimum
Frequency +1 kHz
0.55
0.85
1.15
V
tON(MAX)
Maximum Turn-on Time
12
14
16
μs
2.475
2.500
2.525
V
2.38
2.43
2.48
V
Current-Sense Section
VRV
Reference Voltage
VCCR
Variation Test Voltage on CS Pin
for Constant Current Regulation
tLEB
Leading-Edge Blanking Time
tMIN
Minimum On Time in CC
tPD
Propagation Delay to GATE
Output
DSAW
Duty Cycle of SAW Limiter
40
%
tDIS-BNK
tDIS Blanking Time of VS
1.5
μs
IVS-BNK
VS Current for VS Blanking
100
μA
VCS=0.24 V
VVS=-0.5 V, VCS=1.5 V
50
300
ns
600
ns
100
150
ns
Continued on the following page…
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Electrical Characteristics
www.fairchildsemi.com
5
Unless otherwise specified, VDD=15 V and TA=25°C.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
Current-Error-Amplifier Section
μmho
Gm
Transconductance
ICOMI-SINK
COMI Sink Current
VEAI=3 V, VCOMI=5 V
25
38
μA
COMI Source Current
VEAI=2 V, VCOMI=0 V
25
38
μA
VCOMI-HGH
COMI High Voltage
VEAI=2 V
4.7
VCOMI-LOW
COMI Low Voltage
VEAI=3 V
ICOMI-SOURCE
85
V
0.1
V
Over-Current Protection Section
VOCP
VLowOCP
VCS Threshold Voltage for OCP
0.60
0.67
0.74
V
VCS Threshold Voltage for Low OCP
0.13
0.18
0.23
V
VLowOCP-EN
VS Threshold Voltage to Enable LOW OCP Level
0.40
V
VLowOCP-DIS
VS Threshold Voltage to Disable LOW OCP Level
0.60
V
Over-Temperature-Protection Section
TOTP
TOTP-HYS
Threshold Temperature for OTP(3)
140
Restart Junction Temperature Hysteresis
150
10
160
o
C
o
C
Note:
3. When the over-temperature protection (OTP) is activated, the power system enters Auto-Recovery Mode and
output is disabled.
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Electrical Characteristics (Continued)
www.fairchildsemi.com
6
1.5
1.3
1.3
Normalized to 25 °C
Normalized to 25 °C
1.5
1.1
0.9
FLS3217M
0.7
FLS3217N
1.1
0.9
FLS3217M
0.7
FLS3217N
FLS3247N
FLS3247N
0.5
0.5
-40
-30
-15
0
25
50
75
85
100
-40
125
-30
-15
0
VDD-ON vs. Temperature
Figure 6.
1.5
1.5
1.3
1.3
Normalized to 25 °C
Normalized to 25 °C
Figure 5.
1.1
0.9
FLS3217M
0.7
50
75
85
100
125
FLS3217N
100
125
100
125
VDD-OFF vs. Temperature
1.1
0.9
FLS3217M
0.7
FLS3217N
FLS3247N
FLS3247N
0.5
0.5
-40
-30
-15
0
25
50
75
85
100
-40
125
-30
-15
0
Figure 7.
IDD-OP vs. Temperature
Figure 8.
1.5
1.3
1.3
Normalized to 25 °C
1.5
1.1
0.9
FLS3217M
0.7
25
50
75
85
Temp [°C]
Temp [°C]
Normalized to 25 °C
25
Temp [°C]
Temp [°C]
FLS3217N
VOVP vs. Temperature
1.1
0.9
FLS3217M
0.7
FLS3217N
FLS3247N
FLS3247N
0.5
0.5
-40
-30
-15
0
25
50
75
85
100
-40
125
Figure 9.
fMAX_CC vs. Temperature
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
-30
-15
0
25
50
75
85
Temp [°C]
Temp [°C]
Figure 10. fMIN_CC vs. Temperature
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Typical Performance Characteristics
www.fairchildsemi.com
7
1.5
1.3
1.3
Normalized to 25 °C
Normalized to 25 °C
1.5
1.1
0.9
FLS3217M
0.7
FLS3217N
1.1
0.9
FLS3217M
0.7
FLS3217N
FLS3247N
FLS3247N
0.5
0.5
-40
-30
-15
0
25
50
75
85
100
125
-40
-30
-15
0
Temp [°C]
50
75
85
100
125
100
125
Figure 12. VVVR vs. Temperature
1.5
1.5
1.3
1.3
Normalized to 25 °C
Normalized to 25 °C
Figure 11. VCCR vs. Temperature
1.1
0.9
FLS3217M
0.7
25
Temp [°C]
FLS3217N
1.1
0.9
FLS3217M
0.7
FLS3217N
FLS3247N
FLS3247N
0.5
0.5
-40
-30
-15
0
25
50
75
85
100
125
-40
Temp [°C]
-15
0
25
50
75
85
Temp [°C]
Figure 13. VOCP vs. Temperature
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
-30
Figure 14. VOCP_Low vs. Temperature
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Typical Performance Characteristics (Continued)
www.fairchildsemi.com
8
FLS3217 / FLS3247 is an AC-DC PWM controller for
®
LED lighting applications. TRUECURRENT techniques
regulate accurate LED current independent of input
voltage, output voltage, and magnetizing inductance
variations. The linear frequency control in the oscillator
reduces conduction loss and maintains DCM operation
in the wide range of output voltage, which implements
high power factor correction in a single-stage flyback
topology. A variety of protections, such as short/openLED protection, over-temperature protection, and cycleby-cycle current limitation stabilize system operation
and protect external components.
Startup
Power-Factor Controller (PFC) and Total
Harmonic Distortion (THD)
In a conventional boost converter, Boundary Conduction
Mode (BCM) is generally used to keep input current in
phase with input voltage for Power Factor (PF) and
Total Harmonic Distortion (THD). In flyback / buck boost
topology, constant turn-on time and constant frequency I
Discontinuous Conduction Mode (DCM) can implement
high PF and low THD as shown in Figure 16. Constant
turn-on time is maintained by the internal error amplifier
and a large external capacitor (typically over 1µF) at the
COMI pin. Constant frequency and DCM operation is
managed by linear frequency control.
Powering at startup is slow due to the low feedback-loop
bandwidth in the PFC converter. To increase power
during startup, the internal oscillator counts 12ms to
define Startup Mode. During Startup Mode, turn-on time
is determined by current-mode control with 0.2V voltage
limit. Transconductance becomes 14 times bigger, as
shown in Figure 15. After Startup Mode, turn-on time is
controlled by Voltage Mode, using the COMI voltage. The
error amplifier transconductance is reduced to 85µmho.
IIN
IIN_AVG
VDD = VDD_ON
VIN
GATE
Constant Frequency
VCS
0.2V
VCOMI
Figure 16. Input Current and Switching
Linear Frequency Control
14gm gm
DCM should be guaranteed for high power factor in
flyback topology. To maintain DCM in the wide range of
output voltage, frequency is linearly changed by output
voltage in linear frequency control. Output voltage is
detected by auxiliary winding and a resistive divider
connected to the VS pin, as shown in Figure 17.
Startup Mode: 12ms
ILED
Time
Figure 15. Startup Sequence
Constant Current Regulation
The output current can be estimated using the peak
drain current and inductor current discharge time
because output current is same as the average of the
diode current in steady state. The peak value of the
drain current is determined by the CS pin and the
inductor discharge time (tDIS) is sensed by tDIS detector.
By using three pieces of information (peak drain current,
inductor discharging time, and operating switching
period); the TRUECURRENT block calculates estimates
the output current. The output of the TRUECURRENT
calculation is compared with an internal precise
reference to generate an error voltage, VCOMI, which
determines the turn-on time in Voltage-Mode control.
With Fairchild’s innovative technique, constant current
output can be precisely controlled.
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
Figure 17. Linear Frequency Control
When the output voltage decreases, the secondary
diode conduction time is increased and the linear
frequency control lengthens the switching period. This
maintains DCM operation in the wide output voltage
range, as shown in Figure 18. The frequency control
also lowers primary rms current with better power
efficiency in full-load condition.
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Functional Description
www.fairchildsemi.com
9
Secondary
Current
LED Short !
nVo
Lm
VO =
VO.nom
t
VIN
t
DIS
3
n VO
4
Lm
VO =
75% VO.nom
4
t
3
DIS
VCS
0.2V
4
t
3
3
n VO
5
Lm
VO =
60% VO.nom
5
t DIS
3
VDD
VDD_ON
5
t
3
VDD_OFF
Figure 18. Primary and Secondary Current
Figure 20. Waveforms at Short-LED Condition
BCM Control
The end of secondary diode conduction time is possibly
over a switching period set by linear frequency control.
In this case, FLS3217 and FLS3247 don’t allow CCM
and the operation mode changes from DCM to BCM.
Therefore, FLS3217 and FLS3247 eliminate subharmonic distortion in CCM.
Short-LED Protection
In the event of a short LED condition, the switching
MOSFET and secondary diode are usually stressed by
the high-power current. However, FLS3217 and
FLS3247 change OCP level in short-LED condition.
When VS is lower than 0.4 V, the OCP level lowers to
0.2 V from 0.7 V, as shown in Figure 17. Power is
limited and external component current stress is
relieved.
LEB
Open LED Protection
FLS3217 and FLS3247 protect external components,
such as diode and capacitor, at secondary side in openLED condition. During switch-off, the VDD capacitor is
charged up to the auxiliary winding voltage, which is
applied as the reflected output voltage. Because the VDD
voltage has output voltage information, the internal
voltage comparator on the VDD pin can trigger output
over-voltage protection (OVP), as shown in Figure 21.
When at least one LED is open-circuited, output load
impedance becomes very high and the output capacitor
is quickly charged up to VOVP x Ns / Na. Then switching
is shutdown and VDD block goes into “Hiccup Mode” until
the open-LED condition is removed, shown in Figure 22.
Internal
Bias
VDD Good
1 CS
+
-
VDD 2
VOCP
VOVP
-
+
+
-
At VS < 0.4V,
VOCP = 0.2V.
4 VS
At VS > 0.6V,
VOCP = 0.7V.
S
VDD Good
Figure 19. Internal OCP Block
Figure 20 shows operational waveforms at short-LED
condition. Output voltage is quickly lowered to 0V after
the LED-short event. Then the reflected auxiliary voltage
is also 0V, making VS less than 0.4 V. 0.2 V OCP level
limits the primary-side current and VDD “hiccups” up and
down in between UVLO hysteresis.
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
Q
Shutdown Gate Driver
R
Figure 21. Internal OVP Block
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Primary
Current
www.fairchildsemi.com
10
The built-in temperature-sensing circuit shuts down
PWM output once the junction temperature exceeds
150°C. While PWM output is off, VDD gradually drops to
the UVLO voltage. Some of the internal circuits are shut
down and VDD gradually increases again. When VDD
reaches 16 V, all the internal circuits start operating. If
the junction temperature is still higher than 140°C, the
PWM controller shuts down immediately.
Figure 22. Waveforms at Open-LED Condition
Under-Voltage Lockout (UVLO)
The turn-on and turn-off thresholds are fixed internally at
16 V and 7.5 V, respectively. During startup, the VDD
capacitor must be charged to 16 V through the startup
resistor, so that the FLS32x7 is enabled. The VDD
capacitor supplies VDD until power can be delivered
from the auxiliary winding of the main transformer. VDD
must not drop below 7.5 V during startup. The UVLO
hysteresis window ensures that the VDD capacitor is
adequate to supply VDD during startup.
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.1
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Over-Temperature Protection (OTP)
www.fairchildsemi.com
11
7
10.00
9.10
5
6.60
6.20
0.56
1
4
TOP VIEW
3.60
3.20
7.62
5.08 MAX
3.60
3.00
0.33 MIN
2.54
1.62
1.42
0.56
0.36
7.62
FRONT VIEW
NOTES: UNLESS OTHERWISE SPECIFIED
A. THIS PACKAGE COMPLIES TO JEDEC MS-001,
VARIATION BA, EXCEPT FOR TERMINAL COUNT
(7 RATHER THAN 8)
B. ALL DIMENSIONS ARE IN MILLIMETERS
C. DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD
FLASH, AND TIE BAR PROTRUSIONS.
D. DIMENSIONS AND TOLERANCES PER
ASME Y14.5M-2009
E. DRAWING FILENAME: MKT-NA07BArev3
0.35
0.20
15°
0°
9.91
7.62
SIDE VIEW
5.00
4.80
3.81
A
B
5
7 6
4.00
3.80
6.20
5.80
PIN #1
1
2
3
4
(0.33)
TOP VIEW
R0.10
R0.10
8°
0°
0.900
0.406
1.27
0.25 M C B A
0.51
0.33
3.81
1.27
0.10 C
FRONT VIEW
3.85 7.35
0.65 TYP
LAND PATTERN RECOMMENDATION
B
C
1.75 MAX
0.25
0.10
1.75 TYP
OPTION A
BEVEL EDGE
0.25
0.19
OPTION B
NO BEVEL EDGE
SIDE VIEW
NOTES:
A. THIS PACKAGE DOES NOT FULLY CONFORM
0.50
x
45
TO JEDEC MS-012, VARIATION AA
0.25
B. ALL DIMENSIONS ARE IN MILLIMETERS
GAGE PLANE C. DIMENSIONS DO NOT INCLUDE MOLD FLASH
OR BURRS
0.36
D. DRAWING FILENAME: MKT-M07Brev4
SEATING PLANE
(1.04)
DETAIL B
SCALE 2:1
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