Diodes AP3981B User Manual

General Description
Based on Flyback topology, the Primary side
Regulated AP3981B 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 6W with 12V-0.5A. 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
switching
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
82% 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.
AP3981B EV2
Rev1.0
Universal AC input, Primary Side Regulation
AP3981B 12V-500mA EV2 Board User Guide
the
method operations,
Page 1 of 13
Universal AC input PSR 12V-500mA 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 – 500mA
~ 82.0%
6W
OCP, OVP, OLP,OTP
34 x 51 x 10 mm
Yes
11 – 12 - 2019
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