FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
May 2012
FLS3217 / FLS3247
Single-Stage PFC Primary-Side-Regulation Offline
LED Driver with Integrated Power MOSFET
Features
Cost-Effective Solution without Input Bulk Capacitor
and Feedback Circuitry
Power-Factor Correction (PFC)
Integrated Power MOSFET
Accurate Constant-Current (CC) Control
Independent Online Voltage, Output Voltage, and
Magnetizing Inductance Variation
Linear Frequency Control for Increased Efficiency
Open / Short-LED Protection
Cycle-by-Cycle Current Limiting
Over-Temperature Protection with Auto Restart
Low Startup Current: 20μA
Low Operating Current: 5mA
V
DD
Over-Voltage Protection (OVP)
V
DD
Under-Voltage Lockout (UVLO)
Application Voltage Range: 80V
AC
~ 308V
AC
Description
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.
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
FLS3217M
FLS3217N
FLS3247N
.
-40°C to +125°C
Operating
Temperature Range
Package
7-Lead, Small Outline Package (SOIC)
7-Lead, Small Outline Package (DIP)
Packing Method
Tape & Reel
Tube
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.0
www.fairchildsemi.com
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Application Diagram
BRIDGE DIODE
TRANS
LINE INPUT
FUSE
2 VDD
DRAIN 7
NC 6
5 COMI
3 GND
VS 4
CS 1
Figure 1.
Typical Application
Internal Block Diagram
DRAIN
7
Internal
Bias
V
DD
Good
VDD 2
V
OVP
+
-
Shutdown
Max. Duty
Controller
+
-
S
R
+
OSC
S
Q
V
OCP
Gate
Driver
Q
OCP Level
Controller
VS
-
LEB
Sawtooth
Generator
1 CS
TSD
R
V
DD
Good
+
-
5 COMI
Error
Amp.
-
+
NC
6
DCM Frequency
Controller
t
DIS
Detector
V
REF
GND 3
Auto Restart Protection:
OVP (Over-Voltage Protection)
UVLO (Under-Voltage Lockout)
OTP (Over-Temperature Protection)
Freq.
TRUECURRENT®
Calculation
4 VS
VS
Sample & Hold
Figure 2.
Functional Block Diagram
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.0
www.fairchildsemi.com
2
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Marking Information
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
S3217
TM
ZXYTT
S3247
TM
Figure 3.
Top Mark
Pin Configuration
Figure 4.
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
5
6
7
Name
CS
VDD
GND
VS
COMI
NC
DRAIN
Description
Current Sense.
This pin connects a current-sense resistor to detect the MOSFET current for
the output-current regulation in Constant-Current (CC) regulation.
Power Supply.
IC operating current and MOSFET driving current are supplied using this pin.
Ground
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. 1.0.0
www.fairchildsemi.com
3
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
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
VDD
V
VS
V
CS
V
COMI
I
D
DC Supply Voltage
(1,2)
VS Pin Input Voltage
CS Pin Input Voltage
COMI Pin Input Voltage
Parameter
Min.
-0.3
-0.3
-0.3
T
A
=25°C,
FLS3217M/N
T
A
=25°C, FLS3247N
FLS3217M/N
FLS3247N
FLS3217M/N
FLS3247N
SOIC, T
A
＜50°C
DIP, T
A
＜50°C
SOIC, T
A
＜50°C
DIP, T
A
＜50°C
SOIC, T
A
＜50°C
DIP, T
A
＜50°C
-55
-
Max.
30
7.0
7.0
7.0
1
4
4
16
1
4
660
1
150
95
40
25
+150
+150
+260
5
2
Unit
V
V
V
V
A
Continuous Drain Current
I
DM
I
AR
P
D
JA
JC
T
J
T
STG
T
L
ESD
Pulsed Drain Current
Avalanche Current
Power Dissipation
Thermal Resistance (Junction-to-Air)
Thermal Resistance (Junction-to-Case)
Maximum Junction Temperature
Storage Temperature Range
A
A
mW
W
°C/W
°C/W
°C
°C
°C
V
Lead Temperature (Soldering 10 seconds)
ESD Capability, Human Body Model
ESD Capability, Charged Device Model
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
T
A
Parameter
Operating Ambient Temperature
Min.
-40
Max.
125
Unit
°C
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.0
www.fairchildsemi.com
4
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Electrical Characteristics
Unless otherwise specified, V
DD
=15V and T
A
=25°C.
Symbol
MOSFET Section
BV
DSS
R
DS(ON)
Parameter
Drain-Source Breakdown Voltage
Static Drain-Source
FLS3217N
On Resistance
FLS3247N
Input Capacitance
FLS3217N
FLS3247N
FLS3217M
FLS3217M
Condition
I
D
=250µA, V
GS
=0V
I
D
=0.5A, V
GS
=10V
I
D
=1A, V
GS
=10V
V
GS
=0V, V
DS
=25V,
f
S
=1MHz
Min.
700
Typ.
Max.
Unit
V
13
8.8
2.4
175
250
435
23
25
51
14.5
6.75
16.0
7.75
4.00
2
22.0
23.5
65
23.5
2.35
0.85
14
2.500
2.43
300
16
11.0
2.8
200
Ω
Ω
Ω
pF
pF
pF
FLS3217M
C
ISS
C
OSS
V
DD
Section
V
DD-ON
V
DD-OFF
I
DD-OP
I
DD-ST
V
OVP
f
MAX-CC
f
MIN-CC
VS
MAX-CC
VS
MIN-CC
t
ON(MAX)
V
RV
V
CCR
t
LEB
t
MIN
t
PD
D
SAW
t
DIS-BNK
I
VS-BNK
Output Capacitance FLS3217N
FLS3247N
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
Operating Current
Startup Current
V
DD
Over-Voltage Protection Level
Maximum Frequency in CC
Minimum Frequency in CC
VS for Maximum Frequency in CC
VS for Minimum Frequency in CC
Maximum Turn-on Time
Reference Voltage
Variation Test Voltage on CS Pin
for Constant Current Regulation
Leading-Edge Blanking Time
Minimum On Time in CC
Propagation Delay to GATE
Output
Duty Cycle of SAW Limiter
t
DIS
Blanking Time of VS
VS Current for VS Blanking
V
GS
=0V, V
DS
=25V,
f
S
=1MHz
25
pF
pF
pF
17.5
8.75
5.00
20
25.0
70
26.0
2.45
1.15
16
2.525
2.48
V
V
mA
μA
V
kHz
kHz
V
V
s
V
V
ns
ns
V
S
=2.4V, C
L
=MOSFET
C
ISS
V
DD
=V
DD-ON
– 0.16V
2.85
Oscillator Section
V
DD
=10V, 20V
V
DD
=10V, 20V
Frequency=Maximum
Frequency-2kHz
Frequency=Minimum
Frequency +1kHz
60
21.0
2.25
0.55
12
2.475
V
CS
=0.24V
2.38
Current-Sense Section
V
VS
=-0.5V, V
CS
=1.5V
50
600
100
40
1.5
100
150
ns
%
s
A
Continued on the following page…
© 2012 Fairchild Semiconductor Corporation
FLS3217 / FLS3247 • Rev. 1.0.0
www.fairchildsemi.com
5
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