Diodes AP3981D2 User Manual

General Description
Based on Flyback topology,
Regulated AP3981D2 EV board is designed to serve
as an example for High Efficiency, low cost & less
components consumer home appliance systems. Also
a 650V N MosFet is integrated within control IC for
easy fitting in a flexible & small size power system
design. During the valley on operating & work at PFM
region the high efficiency and low standby function can
be achieved, by mean of using multi-mode controlling
skill the accurate constant voltage and constant current
can be easy meet. Its output power is rated at 12W
with 12V-1A. It can meet DOE VI and CoC Tier 2
energy efficiency requirement.
Key Features

90 ~264V input range
AC

Using the Primary side control for eliminating the Opto-
coupler.

Multi-Mode PFM method operations,
frequency between 24kh ~80Khz.

With Valley on detection the switching stay at Valley on
region so that will improve power converting efficiency &
EMI performance, the 87% Efficiency can be reached at
full load.

During the burst mode operation and Low start-up
operating quiescent currents the 75mW low standby
input power can be achieved.

Dynamic response is improved during work at three
mode operation as well as benefiting the accurate
constant voltage (CV) regulation & constant current (CC)
performance.

There is a Soft start during startup process.

Built-in Jittering Frequency function which is the EMI
emission can be improved.

Internal Auto Recovery OCP, OVP, OLP, OTP Power
Protection, cycle by cycle current limit, also with DC
polarity protection

Built –in Cable Compensation mode.

With a Brown out Protection.
Applications

Switching AC-DC Adaptor & Charger

Power home Appliances systems

The auxiliary Vcc power supply for bigger power system.
AP3981D2 EV1
Rev 1.0
Universal AC input, Primary Side Regulation
AP3981D2 12V-1A EV Board User Guide
the Primary side
the switching
Page 1 of 12
Universal AC input PSR 12V-1.0A Power
Specifications (CV & CC mode)
Parameter
Input Voltage
Input standby power
Main output Vo / Io
Efficiency
Total Output Power
Protections
XYZ Dimension
ROHS Compliance
Evaluation Board Picture:
Figure 1: Top View
Figure 2: Bottom View
Value
90 to 264V
AC
75mW
12V – 1A
~ 87%
12W
OCP, OVP, OLP,OTP
63 x 34 x 20 mm
Yes
10 – 25. 2018
www.diodes.com