SE3912 Datasheet, PDF (1/3 Pages) Seaward Electronics Inc. – Low Power Off-Line Digital PWM AC/DC Controller

SE3912
Low Power Off-Line Digital PWM AC/DC Controller
Description
Features
SE3912 is a high performance offline PWM _{ High precision constant voltage(CV) and}
controller for low power AC/DC charger and adaptor
constant current (CC) output.
applications. It operates in primary-side regulation. _{ Primary-Side- Regulation without secondary}
Consequently, opto-coupler and voltage reference
voltage reference and Opto-coupler.
IC such as SE431 could be eliminated. Proprietary _{ Programmable CV and CC Regulation.}
Constant Voltage (CV) and Constant Current(CC) _{ Built- in Adaptive Peak Current Regulation}
control are integrated.
 Programmable wireloss Compensation
In CC control, the current and output power setting ^{ Power-on Soft-Start.}
can be adjusted externally by the sense resistor Rs ^{ Flyback Topology in DCM Operation}
at CS pin. In CV control, multi-mode operations are ^{ Built-in Leading Edge Blanking(LEB)}
utilized to achieve high performance and high ^{ Cycle-by-Cycle Current Limiting}
efficiency. In addition, good load regulation is ^{ VCC under voltage lockout (UVLO).}
achieved by the built-in wireloss compensation.
 Short Circuit Protection.
 Over Temperature Protection.
SE3912 offers power-on soft-start control and _{ Available in SOT23-6 Packages.}
protection coverage with auto-recovery features _{ RoHS Compliant and 100% Lead (Pb)-Free}
including Cycle-by Cycle current limiting, VCC
UVLO,OTP, SCP. Excellent EMI performance is
achieved with frequency shuffling technique.
SESE3912 is available in SOT23-6 packages.
Applications
Pin Configuration
 Cell Phone Charger
 Small Power Adaptor
 Lower Power LED drivers
 Linear Regulator/RCC Replacement.
Revision 12/11/2010
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2009. • www.seawardinc.com.cn • Page 1