FSEZ1307 Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – Primary-Side-Regulation PWM with Power MOSFET Integrated

February 2010
FSEZ1307
Primary-Side-Regulation PWM with Power MOSFET
Integrated
Features
ƒ Low Standby Power: Under 30mW
ƒ High-Voltage Startup
ƒ Few External Components
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 7-Lead SOP Package
Description
This third-generation Primary Side Regulation (PSR)
PWM controller combination power MOSFET,
FSEZ1307, provides several features to enhance the
performance of low-power flyback converters. The
proprietary topology, TRUECURRENT™, enables
precise CC regulation and simplified circuit design for
battery-charger applications. Compared to a
conventional design or a linear transformer, a low-cost,
smaller, and lighter charger results.
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 FSEZ1307, 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
Operating
Temperature Range
FSEZ1307MY
-40°C to +105°C
Eco
Status
Green
Package
Packing
Method
7-Lead, Small Outline Package (SOP-7) Tape & Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2010 Fairchild Semiconductor Corporation
FSEZ1307 • Rev. 1.0.2
www.fairchildsemi.com