/a>PSR” title=”PSR”>PSR” title=”PSR”>PSR) and highly integrated PWM controller, standby power consumption less than 300mW, high voltage start-up, with minimal external components, no secondary feedback circuit Constant voltage (CV) and constant current (CC) control, PWM fixed frequency 50kHz, mainly used in mobile phone, cordless phone, PDA, digital camera and other chargers, replacing linear transformers and RCC switching power supply (SMPS). This article introduces the main FSEZ1317 Features, functional block diagram, simplified PSR flyback converter circuit diagram, high voltage start-up circuit diagram and 6W LED lighting driver main features, circuit diagram and transformer circuit diagram.
FSEZ1317: Primary-Side-Regulation PWM with POWER MOSFET Integrated
This third-generation Primary-Side-Regulation (PSR) and highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters. The proprietary topology, TRUECURRENT™, of FSEZ1317 enables precise CC regulation and simplified circuit design for batterycharger applications. A low-cost, smaller, and lighter charger results, as compared to a conventional design or a linear transformer.
To minimize standby power consumption, the proprietary green mode provides off-time modulation to linearly decrease PWM frequency under light-load conditions. Green mode assists the power supply in meeting power conservation requirements.
By using the FSEZ1317, a charger can be implemented with few external components and minimized cost.
FSEZ1317 main features:
Low Standby Power Under 30mW
Fewest 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 with Frequency Hopping to Solve EMI Problem
Cable Compensation in CV Mode
Peak-Current-Mode Control in CV Mode
Cycle-by-Cycle Current Limiting
VDD Over-Voltage Protection with Auto Restart
VDD Under-Voltage Lockout (UVLO)
Gate Output Maximum Voltage Clamped at 15V
Fixed Over-Temperature Protection with Auto Restart
Available in the 7-Lead SOP and DIP Packages
Battery chargers for cellular phones, cordless phones, PDAs, digital cameras, power tools, etc.
Replaces linear transformers and RCC SMPS
Figure 1. FSEZ1317 Functional Block Diagram
Figure 2. FSEZ1317 Simplified PSR Flyback Converter Circuit Diagram
Figure 3. FSEZ1317 High Voltage Startup Circuit Diagram
Figure 4. Typical Application Circuit Diagram of FSEZ1317
6W LED Lighting Driver
The following reference design supports inclusion of FSEZ1317NY in design of LED illumination.
6W LED lighting driver main features:
Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary- Feedback Circuitry
Built in 700V/1A MOSFET
Low EMI through Frequency Hopping
Low Power Consumption in Standby
Protection Functions: UVLO, Over-Voltage, Over-Current, and Over-Temperature
Figure 5. 6W LED Lighting Driver Circuit Diagram
Figure 6. 6W LED Lighting Driver Transformer Circuit Diagram
For details, see: