Diodes AP3981D2 User Manual
Universal AC input, Primary Side Regulation
AP3981D2 12V-1A EV Board User Guide
Parameter
Value
Input Voltage
90 to 264VAC
Input standby power
75mW
Main output Vo / Io
12V – 1A
Efficiency
~ 87%
Total Output Power
12W
Protections
OCP, OVP, OLP,OTP
XYZ Dimension
63 x 34 x 20 mm
ROHS Compliance
Yes
General Description
Based on Flyback topology, the Primary side
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 ~264VAC input range
Using the Primary side control for eliminating the Opto-
coupler.
Multi-Mode PFM method operations, the 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 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.
Universal AC input PSR 12V-1.0 A Power
Specifications (CV & CC mode)
Evaluation Board Picture:
Figure 1: Top View
Applications
Switching AC-DC Adaptor & Charger
Power home Appliances systems
The auxiliary Vcc power supply for bigger power system.
AP3981D2 EV1 Page 1 of 12 10 – 25. 2018
Rev 1.0 www.diodes.com
Figure 2: Bottom View
Universal AC input Primary side regulation
AP3981D2 12V-1A EV Board User Guide
EE16C （Ae = 38mm^2）
NO
Winding
NAME
TERMINAL NO.
WINDING
START
FINISH
WIRE
TURNS
Layers
1
Na 5 4
Φ 0.21mm X 3
11 Ts
1
2
Np1
3 2 Φ 0.32mm X 1
46 Ts
2
3
Shield
4（GND）
NC
Φ 0.15mm X 1
12 Ts
1
4
Ns
7 6 Φ 0.65W X 1
9 Ts
1
5
Np2
2 1 Φ 0.32mm X 1
19 Ts
1
Primary Inductance
Pin 1-3,all other windings open,
measured at 10kHz, 0.4VRMS
1mH ± 7 %
Primary Leakage
Inductance
Pin 1-3, all other windings shorted,
measured at 10kHz, 0.4VRMS
80 uH (Max.)
AP3981D2 (90 VAC ~ 265VAC one outputs 12W Transformer Spec.)
1) Core& Bobbin:
EE16C, 5+2 pin 2)
Electrical Diagram:
3) Transformer Parameters
1. Primary Inductance (Pin1-Pin3), all other windings are open Lp =1 mH
± 7
% @10KHz
AP3981D2 EV1 Page 2 of 12 06 - 05 2019
Rev1.0 www.diodes.com
Universal AC input Primary side regulation
AP3981D2 12V-1A EV Board User Guide
Evaluation Board Schematic
Figure 3: Evaluation Board Schematic
Evaluation Board PCB Layout
Figure4: PCB Board Layout Top View Figure5: PCB Board Layout Bottom View
AP3981D2 EV1 Page 3 of 12 06 - 05 2019
Rev1.0 www.diodes.com
Universal AC input Primary side regulation
AP3981D2 12V-1A EV Board User Guide
AP3981D2 12V-1A BOM 8-28-2018
Item
QTY per
board
REF. DES. Description MFG or Supplier
MFG P/N or Supplier P/N
Digi key #
0
1 1 C1
10uf /400V 8 x 18mm Aishi Electro
2 1 C2
10uf /400V 8 x 18mm Aishi Electro
3 1 C3
4.7uF/50V 5 x 10mm Aishi Electro
4 1 C4
470pf / 200V, 0805 X7R Holy Stone
5 1 C5
470uf /16V 8 x 12mm Rubycon Electro
6 1 C6
470uf /16V 8 x 12mm Rubycon Electro
7 1 C7
470pf / 200V, 0805 X7R Holy Stone
8 1 R1
1.6M ohm 1206 Yageo
9 1 R2
1.6M ohm 1206 Yageo
10 1 R3
360K ohm 1206 Yageo
11 1 R4
360K ohm 1206 Yageo
12 1 R5
300R ohm 1206 Yageo
13 1 R6
300R ohm 1206 Yageo
14 1 R7
2.7R ohm 0805 Yageo
15 1 R8
30.1K ohm 0805 Yageo
16 1 R9
6.19K ohm 0805 Yageo
17 1 R10
300K ohm 0805 Yageo
18 1 RS1
1.8R ohm 1206 Yageo
19 1 RS2
1.8R ohm 1206 Yageo
20 1 R12
20R ohm 0805 Yageo
21 1 R13
12K ohm 1206 Yageo
22 1 BD1
ABS10 Diodes
23 1 D1
D7(1N4007) Diodes
24 1 D2
F7(FR107) Diodes
25 1 D3
SR5100L JF
26 1 F1
2A Fuse
27 1 L1
10mH Inductor
28 1 Y1
470pf/250Vac Y1 Holy Stone
29 1 U1
AP3981D2 sop-8 Diodes
AP3981D2 12V-1A BOM 8-28-2018
Quick Start Guide
1. The evaluation board is preset at 12V/1A from output + & -
2. Ensure that the AC source is switched OFF or disconnected before doing connection.
3. Connect the AC line wires of power supply to “L and N” on the left side of the board.
4. Turn on the AC main switch.
5. Measure Red & Black wires to ensure correct output voltages at 12V respectively.
Build of Material
AP3981D2 EV1 Page 4 of 12 06 - 05 2019
Rev1.0 www.diodes.com
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