Fairchild FSEZ1216B- Primary-Side-Regulation PWM Integrated Power MOSFET Data Handbook
Summary
The FSEZ1216B is a highly integrated PWM controller power MOSFET for developing efficient, primary-side regulating low-power flyback converters. Utilizing proprietary Green-Mode function and supporting both Constant Voltage (CV) and Current (CC) control, it minimizes standby power consumption while simplifying circuit design. This manual provides comprehensive technical details, including functional diagrams, operational parameters, and protection features like OVP and UVLO. It is the ideal solution for battery chargers and SMPS units used in devices such as cell phones, PDAs, cameras, and power tools.
Page 1 Text Content
FSEZ1216B Prim ary-Side-R egulation PW Integrated Pow er M SFET
January 2009
FSEZ1216B Primary-Side-Regulation PWM Integrated Power MOSFET Features Description
Constant-Voltage (CV) and Constant-Current (CC) This highly integrated PWM controller provides several features to enhance the performance of low-power
Control without Secondary-Feedback Circuitry
flyback converters. The proprietary topology enables
Green-Mode Function: PWM Frequency Linearly
most simplified circuit design especially for battery
Decreasing
charger applications. A low-cost, smaller, and lighter Fixed PWM Frequency at 50k Hz with Frequency charger results when compared to a conventional design or a linear transformer. The startup current is
Hopping to Solve EMI Problems
only 10μA, which allows large startup resistance for
Cable Compensation in CV mode
further power saving.
Low Startup Current: 10μA
To minimize the standby-power consumption, the Low Operating Current: 3.5m A proprietary green-mode function provides off-time modulation to linearly decrease PWM frequency under
Peak-Current-Mode Control in CV Mode
light-load conditions. This green-mode function assists Cycle-by-Cycle Current Limiting the power supply in meeting power conservation requirements.
VDD Over-Voltage Protection (OVP) with
Auto-Restart By using FSEZ1216B, a charger can be implemented with few external components and minimized cost. A
VDD Under-Voltage Lockout (UVLO)
typical output CV/CC characteristic envelope is shown Fixed Over-Temperature Protection (OTP) in Figure 1.
with Latch
FSEZ1216B series controllers are available in an 8-pin DIP-8 Package Available DIP package.
Applications Battery Chargers for Cellular Phones, Cordless Phones, PDA, Digital Cameras, Power Tools Best Choice to Replace Linear Transformer and RCC SMPS
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number Operating Package Packing
Temperature Range Status Method
FSEZ1216BNY -40°C to +105°C Green 8-Lead, Dual Inline Package (DIP-8) Tube
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FSEZ1216B Rev. 1.0.0
Page Summary Contents For Fairchild FSEZ1216B- Primary-Side-Regulation PWM Integrated Power MOSFET Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 15 |
| File Size | 640.11 KB |
| Published | June 20, 2026 |
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Frequently Asked Questions
What modes does this integrated controller support for regulating power?
It provides Constant-Voltage (CV), Constant-Current (CC), and features like Cycle-by-Cycle Current Limiting.
What protection circuits are built into the FSEZ1216B chip?
The device includes Over-Voltage Protection (OVP), Under-Voltage Lockout (UVLO), and Fixed Over-Temperature Protection (OTP).
How do I compensate for voltage loss in my cables while running in CV mode?
Connect a resistor between the COMR pin and GND for cable loss compensation in Constant-Voltage mode.
What physical package is available for this controller series?
The FSEZ1216B series controllers are offered in an 8-pin Dual Inline Package (DIP-8) format.