Diodes AP3981B User Manual Download Page 1

 

               Universal AC input, Primary Side Regulation 

               

AP3981B 12V-500mA EV2 Board User Guide             

 

 

 

 

   

                                                                                                                                                                                                  

 

AP3981B EV2                                            Page 1 of 13                                                        11 

– 12 - 2019                                                                                                                                                                

Rev1.0                                                                                                                              www.diodes.com                                 
 

                   

                

 

 
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

AC

 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 
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. 

 
 
 

Universal  AC  input  PSR 

12

V-

500m

A  Power 

Specifications (CV & CC mode) 

Parameter 

Value 

Input Voltage 

90 to 264V

AC

 

Input standby power 

75mW 

Main output Vo / Io 

12V 

– 500mA 

Efficiency 

~ 82.0% 

Total Output Power 

6W 

Protections 

OCP, OVP, OLP,OTP 

XYZ Dimension  

34 x 51 x 10 mm 

ROHS Compliance  

Yes  

 

Evaluation Board Picture:  

 

Figure 1: 

Top View

 

 

Figure 2:

 Bottom View 

 

Summary of Contents for AP3981B

Page 1: ...ng 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 qu...

Page 2: ...ters 1 Primary Inductance Pin3 Pin5 all other windings are open Lp 1 75mH 7 1KHz EE16C Ae 19mm 2 NO Winding NAME TERMINAL NO WINDING START FINISH WIRE TURNS Layers 1 Shield 4 GND NC 0 16mm x 3 15Ts 1...

Page 3: ...12V 500mA EV2 Board User Guide AP3981B EV2 Page 3 of 12 11 12 2019 Rev1 0 www diodes com Evaluation Board Schematic Figure 3 Evaluation Board Schematic Evaluation Board PCB Layout Figure4 PCB Board La...

Page 4: ...Supplier P N Digi key 0 1 1 BD1 ABS10 Rectifier Bridge Diodes 2 2 C1 C2 4 7uF 400V electrolytic Aishi Electro 3 1 C3 2 2uF 50V electrolytic Aishi Electro 4 1 C4 1nF 200V 1206 Holy Stone 5 1 C6 1nF 100...

Page 5: ...50Hz Note Pin w 58 5W 69 2mW At no loading Figure 6 The Input Standby Powerwith at different AC input Input power Efficiency at different loading AC input Efficiency Eff_avg at four conditions 10 25 5...

Page 6: ...n AC input Voltage 90VAC 60Hz 115VAC 60Hz 230VAC 50Hz 265VAC 50Hz Note 12 00Vo 12 09V 0 5A 12 127V 0 5A 12 177V 0 5A 12 183V 0 5A 0 4 1 Cross Load Regulation at nominal line AC input voltage AC input...

Page 7: ...1B EV2 Page 7 of 12 11 12 2019 Rev1 0 www diodes com System main switching Voltage Stress on AP3981B Pin 5 6 Figure 10 AP3981C Vds at FL at 264 Vac Vds 551Vp p System Voltage Stress across on D3 Catho...

Page 8: ...tem output Ripple performance Figure 12 The Ripple at 90Vac_in Vpp 112 5mv FL Figure 13 The Ripple at 264Vac_in Vpp 58mv FL System Dynamic Response performance Figure 14 90VAC Load level 0 0 5A Vout 1...

Page 9: ...System Dynamic Response performance Figure 16 90VAC Load level 0 0 5A Vout 11 4 12 47V Figure 17 264VAC Load level 0 0 5A Vout 11 40 12 47V Frequency 100ms 100mS Slew rate 0 25A us Frequency 100ms 100...

Page 10: ...3 MHz 31 45 18 54 1 Quasi Peak 11 3733617927 MHz 38 94 21 05 2 Average 12 4388782936 MHz 31 04 18 95 1 Quasi Peak 15 177795402 MHz 38 07 21 92 Date 4 MAR 2019 13 06 29 150 kHz 30 MHz 6DB RBW 9 kHz MT...

Page 11: ...mary Side Regulation AP3981B 12V 500mA EV2 Board User Guide AP3981B EV2 Page 11 of 12 11 12 2019 Rev1 0 www diodes com Please see the recommand Application note for reference web page http www diodes...

Page 12: ...e or more United States international or foreign patents pending Product names and markings noted herein may also be covered by one or more United States international or foreign trademarks This docum...

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