Fairchild FSEZ1216 Data Handbook
Summary
The FSEZ1216 is a primary-side-regulation PWM integrated power MOSFET designed to simplify power supply design by offering precise CV and CC control without secondary feedback circuitry. This efficient IC supports green mode, cable drop compensation, and over-voltage protection, making it ideal for battery chargers, LED drivers, and RCC SMPS applications.
Page 1 Text Content
FSEZ1216 — Prim ary-Side-R egulation PW Integrated Pow er M SFET
April 2009
FSEZ1216 — Primary-Side-Regulation PWM Integrated Power MOSFET Features Description
Constant-Voltage (CV) and Constant-Current (CC) The primary-side PWM integrated Power MOSFET, FSEZ1216, significantly simplifies power supply design
Control without Secondary-Feedback Circuitry
that requires CV and CC regulation capabilities.
Green Mode: Frequency Reduction at Light-Load
FSEZ1216 controls the output voltage and current Fixed PWM Frequency at 42k Hz with Frequency precisely only with the information in the primary side of the power supply, not only removing the output current
Hopping to Reduce EMI
sensing loss, but also eliminating all secondary
Cable Voltage Drop Compensation in CV Mode
feedback circuitry.
Low Startup Current: 10μA
The green-mode function with a low startup current Low Operating Current: 3.5m A (10µA) maximizes the light load efficiency so the power supply can meet stringent standby power regulations.
Peak-Current-Mode Control in CV Mode
Compared with conventional secondary side regulation
Cycle-by-Cycle Current Limiting
approach, the FSEZ1216 can reduce total cost, VDD Over-Voltage Protection with Auto-Restart component count, size, and weight, while simultaneously increasing efficiency, productivity, and
VDD Under-Voltage Lockout (UVLO)
system reliability.
Gate Output Maximum Voltage Clamped at 18V
A typical output CV/CC characteristic envelope is shown in Figure 1.
Fixed Over-Temperature Protection with Latch DIP-8 Package Available Applications Battery Chargers for Cellular Phones, Cordless Phones, PDA, Digital Cameras, Power Tools Replaces Linear Transformer and RCC SMPS Offline High Brightness (HB) LED Drivers
Figure 1. Typical Output V-I Characteristic
Ordering Information
Operating
MOSFET MOSFET Eco
Part Number Temperature Package Packing
BVDSS RDS.ON Status Method
Range
FSEZ1216NY -40°C to +105°C 600V 9.3Ω Tube
(Typical) Green 8-Lead, Dual Inline Package (DIP-8)
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSEZ1216 • Rev. 1.0.1
Page Summary Contents For Fairchild FSEZ1216 Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 16 |
| File Size | 819.74 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the main benefit of the FSEZ1216 over traditional designs?
It simplifies design by providing CV/CC control using only primary-side information, eliminating secondary feedback circuitry, reducing cost, size, and increasing efficiency.
What is the startup current and operating current?
The startup current is 10µA and the operating current is 3.5mA.
What package is the FSEZ1216 available in?
It is available in an 8-Lead, Dual Inline Package (DIP-8).
What is the function of the VDD pin?
It is the power supply pin for the IC operating current and MOSFET driving current, connected to an external capacitor.