FSEZ1216B Datasheet, PDF (1/15 Pages) Fairchild Semiconductor – Primary-Side-Regulation PWM Integrated Power MOSFET

January 2009
FSEZ1216B
Primary-Side-Regulation PWM Integrated Power MOSFET
Features
ƒ Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
ƒ Green-Mode Function: PWM Frequency Linearly
Decreasing
ƒ Fixed PWM Frequency at 50kHz with Frequency
Hopping to Solve EMI Problems
ƒ Cable Compensation in CV mode
ƒ Low Startup Current: 10μA
ƒ Low Operating Current: 3.5mA
ƒ Peak-Current-Mode Control in CV Mode
ƒ Cycle-by-Cycle Current Limiting
ƒ VDD Over-Voltage Protection (OVP) with
Auto-Restart
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ Fixed Over-Temperature Protection (OTP)
with Latch
ƒ DIP-8 Package Available
Description
This highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback converters. The proprietary topology enables
most simplified circuit design especially for battery
charger applications. A low-cost, smaller, and lighter
charger results when compared to a conventional
design or a linear transformer. The startup current is
only 10μA, which allows large startup resistance for
further power saving.
To minimize the standby-power consumption, the
proprietary green-mode function provides off-time
modulation to linearly decrease PWM frequency under
light-load conditions. This green-mode function assists
the power supply in meeting power conservation
requirements.
By using FSEZ1216B, a charger can be implemented
with few external components and minimized cost. A
typical output CV/CC characteristic envelope is shown
in Figure 1.
FSEZ1216B series controllers are available in an 8-pin
DIP package.
Applications
ƒ Battery Chargers for Cellular Phones, Cordless
Phones, PDA, Digital Cameras, Power Tools
ƒ Best Choice to Replace Linear Transformer and
RCC SMPS
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
FSEZ1216BNY
Operating
Temperature Range
-40°C to +105°C
Eco
Status
Green
Package
8-Lead, Dual Inline Package (DIP-8)
Packing
Method
Tube
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
FSEZ1216B Rev. 1.0.0
www.fairchildsemi.com