FSEZ1317AMY Datasheet, PDF (1/17 Pages) Fairchild Semiconductor – Primary-Side-Regulation PWM with POWER MOSFET Integrated

September 2012
FSEZ1317A
Primary-Side-Regulation PWM with POWER MOSFET
Integrated
Features
 Low Standby Power Under 30mW
 High-Voltage Startup
 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
 V_DD Over-Voltage Protection with Auto Restart
 V_DD Under-Voltage Lockout (UVLO)
 Gate Output Maximum Voltage Clamped at 15V
 Fixed Over-Temperature Protection with
Auto Restart
 Available in the 7-Lead SOP Package
Description
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 FSEZ1317A enables precise CC
regulation and simplified circuit design for battery-
charger 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 FSEZ1317A, a charger can be
implemented with few external components and
minimized cost. A typical output CV/CC characteristic
envelope is shown in Figure 1.
Applications
 Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, power tools, etc.
 Replaces linear transformers and RCC SMPS
Related Resources
 Evaluation Board: FEBFSEZ1317A_CH310v3
 Fairchild Power Supply WebDesigner — Flyback
Design & Simulation - In Minutes at No Expense
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
FSEZ1317AMY_F116
Operating
Temperature Range
-40°C to +105°C
Package
7-Lead, Small Outline Package (SOP-7)
Packing
Method
Tape & Reel
© 2012 Fairchild Semiconductor Corporation
FSEZ1317A • Rev. 1.0.4
www.fairchildsemi.com