FL103 — Primary-Side-Regulation PWM Controller for LED Illumination
May 2012
FL103
Primary-Side-Regulation PWM Controller for
LED Illumination
Features
Low Standby Power: < 30mW
High-Voltage Startup
Few External Component Counts
Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
Green-Mode: Linearly-Decreasing PWM Frequency
Fixed PWM Frequency at 50kHz and 33kHz with
Frequency Hopping to Solve EMI Problems
Peak-Current-Mode Control in CV Mode
Cycle-by-Cycle Current Limiting
V
DD
Over-Voltage Protection (OVP)
V
DD
Under-Voltage Lockout (UVLO)
Adjustable Brownout Detector
Gate Output Maximum Voltage Clamped at 15V
Thermal Shutdown (TSD) Protection
Available in the 8-Lead SOIC Package
Application Voltage Range: 80V
AC
~ 308V
AC
Description
This third-generation Primary-Side-Regulation (PSR)
and highly integrated PWM controller provides features
to enhance the performance of LED illumination.
The proprietary topology, TRUECURRENT™, enables
precise CC regulation and simplified circuit for LED
illumination applications. The result is lower-cost and
smaller LED lighting compared to a conventional design
or a linear transformer.
To minimize standby power consumption, the
proprietary green-mode function provides off-time
modulation to linearly decrease PWM frequency under
light-load conditions. Green mode assists the power
supply in meeting the power conservation requirements.
By using the FL103,
implemented with few
minimized cost.
LED illumination can be
external components and
Applications
LED Illumination
Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, power tools
Figure 1.
8-Lead SOIC
Ordering Information
Part Number
FL103M
Operating
Temperature Range
-40°C to +125°C
Top Mark
FL103
Package
8-Lead, Small-Outline Package (SOIC-8)
Packing
Method
Tape & Reel
© 2012 Fairchild Semiconductor Corporation
FL103 • Rev. 1.0.1
www.fairchildsemi.com