FSEZ1317 Datasheet, PDF (1/17 Pages) Fairchild Semiconductor – Primary-Side-Regulation PWM with POWER MOSFET Integrated

May 2010
FSEZ1317 (EZ-PSR for 2-Chip Product)
Primary-Side-Regulation PWM with POWER MOSFET
Integrated
Features
ƒ Low Standby Power Under 30mW
ƒ High-Voltage Startup
ƒ Fewest External Component Counts
ƒ Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
ƒ Green-Mode: Linearly Decreasing PWM Frequency
ƒ Fixed PWM Frequency at 50kHz with Frequency
Hopping to Solve EMI Problem
ƒ Cable Compensation in CV Mode
ƒ Peak-Current-Mode Control in CV Mode
ƒ Cycle-by-Cycle Current Limiting
ƒ VDD Over-Voltage Protection with Auto Restart
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ Gate Output Maximum Voltage Clamped at 15V
ƒ Fixed Over-Temperature Protection with
Auto Restart
ƒ Available in the 7-Lead SOP and DIP Packages
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 FSEZ1317 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 FSEZ1317, 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
ƒ Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, power tools, etc.
ƒ Replaces linear transformers and RCC SMPS
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
FSEZ1317MY
FSEZ1317NY
Operating
Temperature Range
-40°C to +105°C
-40°C to +105°C
Package
7-Lead, Small Outline Package (SOP-7)
7-Lead, Dual Inline Package (DIP-7)
Packing
Method
Tape & Reel
Tube
© 2009 Fairchild Semiconductor Corporation
FSEZ1317 • Rev. 1.0.4
www.fairchildsemi.com