The SE3901 is a green-mode Pulse Width Modulation
(PWM) controller. It is specifically designed for low
power applications such as 5W-20W Adaptors and
Of-line
battery
Chargers. In
these
typical
applications, the low standby power, space saving,
and low cost are all re SE3901 is a perfect
solutions to meet these challenges. The typical
standby power is only 0. 13Watt.
In normal operation, the SE3901 switches on and off
at a fixed switching frequency of 60 kHz. With a
current limit capability of about 420mA, the SE3901
can directly drive the emitter of a high voltage NPN
transistor. When the output power falls below a given
level, the IC enters skip cycle mode to reduce power
consumption.
The SE3901 also features Under-Voltage Lockout ,
Over-Temperature Protection, Over-Current and
Short Circuit Protections.
The SE3901 is available in TO-94 Packages.

Intermal Zener Diode
Low Cost Emitter Drive PWM Solution
0.13W Standby Power
Current Mode Operation
Short Circuit Protection
Over-Current Protection
Over-Temperature Protection
Under-Voltage Lockout with Auto-restart
Available in TO-94 Packages
RoHS Compliant and  Lead (Pb)-Free

             应用

Battery Chargers
Universal Off-line Power Supplies
Power Adaptors
LED 3W-9W Lighting Solutions with SE1051