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Dual Output Off-Line Non-isolated Flyback Power Solution 

               AP3917B 12V/20mA+3.8V20mA EV3 Board User

’s Guide

 

  

 

 

   

 
AP3917B EV3                                                                     Page 11 of 17                                                                      06-21-2019                                        
Rev 1.0                                                                                                                                                                   www.diodes.com 

CH1: Vds/Vak2; CH2: Vak1 

 

 

 

Fig. 5-9, MOS drain-source 221

V@

85V/60Hz, full load

 

Fig. 5-10,

 

Vo1 terminal Vak 17

V, Vo2 Vak 57V@

85V/60Hz, full 

load 

 

 

Fig. 5-11, MOS drain-source 484

V @

265V/50Hz, full load

 

Fig. 5-12,Vo1 terminal Vak 129

V, Vo2 Vak 42V@

264V/50Hz,full 

load 

 

5.2.3 Output Ripple & Noise 

The ripple and noise was tested at PCB terminal, using coaxial cable (1:1). The bandwidth was limited to 20MHz. A 10uF 
electrolytic capacitor and a 104 ceramic capacitor should be paralleled to the output terminal. 

 

Table 5-7, ripple & noise 

Conditions 

Input voltage 

R&N(mV) 

Figures

 

Vo1 terminal 

Vo2 terminal 

3.8V full load, 12V full load 

85V/60Hz 

96 

184 

Fig. 23 

115V/50Hz 

96 

184 

- 

230V/50Hz 

101 

192 

- 

264V/60Hz 

101 

190 

Fig. 24 

 
CH1:Vo1 output; CH4:Vo2 output 

Содержание AP3917B

Страница 1: ...er Instructions 5 3 3 3 Electrical Specifications 5 Chapter4 Evaluation Board Connections 5 4 1 PCB Layout 5 4 2 Circuit Description 6 4 2 1 Input EMI Filtering 6 4 2 2 Control IC 6 4 2 3 Flyback bloc...

Страница 2: ...ons 12V20mA and 3 8V20mA with both non isolations flyback The two outputs share a three winding transformer The feedback circuitry samples 3 8V output The user s guide provides good design example for...

Страница 3: ...ers Output voltage 1 11 1V 12 0V 12 9V Test at board terminal Output voltage 1 3 61V 3 8V 3 99V loading current 1 0 20mA mA loading current 2 4 20mA performance specifications Standby power 12mW 230V...

Страница 4: ...acitor 6 7mm 1 Aishi 6 C4 10uF 16V X7R SMD 0805 1 Telesky 7 C5 22uF 16V electrolytic capacitor 5 10mm 1 Telesky 8 C6 470pF 500V X7R SMD 0805 1 Telesky 9 C7 470pF 50V X7R SMD 0805 1 Telesky 10 D1 S1MWF...

Страница 5: ...ght tension Tape W 5mm 2 Full layer 3 4 0 17mm 2 UEW 10 5 One layer with tight tension Tape W 5mm 2 Full layer 1 3 0 17mm 1 UEW 23 One layer with tight tension Tape W 7mm 2 Full layer Note the transfo...

Страница 6: ...nding and 12V output winding are in series so if the turn ratio of 12V winding to 3 8V winding approximate to 12 3 8 the output voltage can be fixed to 12V and 3 8V 4 2 4 Output Rectification During t...

Страница 7: ...4 3 791 12 205 230V 50Hz 7 8 3 788 12 197 264V 50Hz 8 6 3 788 12 197 Fig 5 1 Standby Power versus Vin Curve 5 1 2 Efficiency The efficiency data was tested after 10min burning and it was tested at the...

Страница 8: ...d Vin ranges from 85V to 264V Table 5 3 line and load regulation data Vin Vo1 output V Vo2 output V Vin Vo1 V Vo2 V 85V 60Hz 3 752 12 291 115V 60Hz 3 746 12 280 150V 60Hz 3 749 12 282 180V 50Hz 3 748...

Страница 9: ...766 12 157 230V 50Hz 3 786 11 572 3 781 11 757 3 774 11 922 3 769 12 047 3 764 12 147 265V 50Hz 3 785 11 572 3 780 11 755 3 774 11 922 3 768 12 045 3 763 12 147 Fig 5 4 12V and 5V output voltage 3 8V...

Страница 10: ...5 7 Start up time is 15 3ms full load 230V 50Hz Fig 5 8 Start up time is 14 6ms full load 265V 50Hz 5 2 2 Voltage Stress The voltage tested below was between the source and the drain pin of IC The te...

Страница 11: ...full load Fig 5 12 Vo1 terminal Vak 129V Vo2 Vak 42V 264V 50Hz full load 5 2 3 Output Ripple Noise The ripple and noise was tested at PCB terminal using coaxial cable 1 1 The bandwidth was limited to...

Страница 12: ...sponse output voltage was tested at the PCB terminal and the bandwidth was limited to 20MHz The loading is set 0mA as low load and 20mA as high load and last for 0 1s respectively The ramp is set at 4...

Страница 13: ...V FL 85V 60Hz Fig 5 20 dynamic response 12V 0 20mA 3 8V FL 265V 50Hz 5 3 Protection SCP test The SCP test was measured under the condition of output cable terminal short circuit Table 5 9 the short ci...

Страница 14: ...Fig 5 23 SCP 12V output short and 3 8V full load 85V 60Hz Fig 5 24 SCP 12V output short and 3 8V full load 265V 50Hz 5 4 Thermal Test The thermal test was under room temperature after burning 1 hour...

Страница 15: ...3 Fig 5 28 Transformer 33 5 3 8V flyback diode 31 8 full load 264V 50Hz ambient temperature 25 4 5 5 System EMI Scan The power supply passed EN55022 Class B for 230V input and FCC part 15 for 110V inp...

Страница 16: ...ion waveform 230V full load Fig 5 32 N line conduction data 230V full load 5 5 2 Conduction EMI test of 110V full load The test result can pass FCC part 15 limitation with more than 6dB margin Fig 5 3...

Страница 17: ...overed by one 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 trademark...

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