Document
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
July 2014
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 VDD Over-Voltage Protection (OVP) VDD Under-Voltage Lockout (UVLO)
Application Voltage Range: 80 VAC ~ 308 VAC
Applications
LED Lighting System
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.
Ordering Information
Part Number
Operating Temperature Range
FLS3217M
FLS3217N
-40°C to +125°C
FLS3247N .
Package
Packing Method
7-Lead, Small Outline Package (SOIC)
Tape & Reel
7-Lead, Small Outline Package (DIP)
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
+
+
Application Diagram
BRIDGE DIODE
LINE INPUT FUSE
2 VDD DRAIN 7
NC 6
5 COMI
VS 4
3 GND
CS 1
TRANS
Figure 1. Typical Application
Internal Block Diagram
DRAIN 7
VDD 2
VOVP
Internal Bias
VDD Good + -
Max. Duty Controller
SQ
OSC
NC 6
TSD
R VDD Good
GND 3
DCM Frequency Controller
Auto Restart Protection: OVP (Over-Voltage Protection) UVLO (Under-Voltage Lockout) OTP (Over-Temperature Protection)
Freq.
VS
Shutdown
Gate Driver
SQ R
OCP Level Controller
+ VOCP
-
-
+
Sawtooth Generator
VS LEB
tDIS Detector
VREF
Error Amp.
TRUECURRENT® Calculation
Sample & Hold
1 CS 5 COMI 4 VS
Figure 2. Functional Block Diagram
© 2012 Fairchild Semiconductor Corporation FLS3217 / FLS3247 • Rev. 1.0.1
2
www.fairchildsemi.com
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Marking Information
ZXYTT S3217
TM
Pin Configuration
ZXYTT
S3247 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
Figure 3. Top Mark
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. 1.0.1
3
www.fairchildsemi.com
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
VVDD V.