Green Mode PWM IC FA8A70N Series Power Supply Design Example ： 5V/15W Reference Design

Green mode PWM IC FA8A70N series Power supply design example ： 5V/15W Reference Design

1．Overview This document describes the design example of flyback converter using the green mode PWM IC FA8A70N series. The input is universal (90Vac to 264Vac) and the output is 5V/15W. This IC can improve efficiency of middle load to reduce the switching frequency according to the load. Furthermore, it can realize low standby power to change the burst mode switching at the light load.

2．Features Realization of low standby power • Built-in discharge function for AC input filter capacitor (XCAP). (Reduce loss of the discharge resistor) • Integrated frequency decrease function improves efficiency in the middle-load region. (Frequency decrease start point is adjustable based on the settings of mounted parts.) • Intermittent operation (burst operation) system adopted for light load operation achieves low standby power.(Burst operation start point is adjustable based on the settings of mounted parts.) • Switching is allowed between normal operation mode and power-off mode. In power-off mode, lower standby power is ensured. • Built-in 500V high voltage startup circuit. Various Protection are built in. • Overload protection (Auto recovery, Latch) • Integrated function of correcting overload detection level depending on AC input voltage (Correction amount is adjustable based on the settings of externally mounted parts.) • Integrated latch-off function based on external signals, overvoltage protection function, low-voltage prevention function, and overheat protection function • Internal Soft-Start • The lowest frequency is set to 25 kHz to prevent operation at audible frequency under light load. ■Switching frequency jitter function realize low EMI. ■ Internal DSS (Dynamic Self Supply) ■ Drive circuit for MOSFET: -0.5A(sink)/0.5A（source）

3． Application circuit C11 R19 C13

DS2 F1 DS1 T1 1 1 C3 5V/3A AC90 to NF1 NF2 C5 R3 264V 2 C2 C1 C4 C14 C15 C16 3 2 GND ZNR1 CN1 D3 C12 CN2

D1 D2 R20

Q1 R22

PC1A R23 R8 D4 R21 R6 R4 ZD3

R11 R7 R5 C17 R27

C18 R25 FB2 R17 D5 PC2A PC2B R28 IC2 8 7 6 5 VH (NC) VC C OUT R26 R18 IC1 FA8A70N C9 R9 LAT FB CS GND C10 1 2 3 4

ZD2 R12 R10 C6 C8

C7 PC1B

4．Specifications of the Power supply Item Value Unit Input voltage 90 to 264 Vac Output voltage 5 Vdc Output current 3 A 5．Efficiency Item 100Vac 230Vac Efficiency Typ Load(3A) 80.5% 79.5% Input power at NO Load 12.5mW 25.6mW OLP 3.93A 3.88A

6．Characteristics curves

Input voltage vs.Output Voltage Input voltage vs.Efficiency 5.20 86 Io=0.1A Io=1A 5.15 Io=1A 84 Io=2A Io=2A Io=3A 5.10 Io=3A 82 5.05 80 5.00 78 4.95 76

4.90 [%] Efficiency 74 Output voltage [V] voltage Output 4.85 72 4.80 70 50 100 150 200 250 300 50 100 150 200 250 300 Input voltage [Vac] Input voltage [Vac]

Output current vs.Output Voltage Output current vs.Efficiency 5.20 90 Vin=100Vac Vin=100Vac 5.15 Vin=230Vac 80 Vin=230Vac 5.10 70 60 5.05 50 5.00 40 4.95 30 4.90 Efficiency [%]

Output voltage [V] voltage Output 20 4.85 10 4.80 0 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 Output current [A] Output current [A]

Input voltage vs.OCP Output current vs.Frequency Vin=100Vac 4.4 Vin=230Vac 70

4.2 60

50 4.0 40 3.8 OCP [A] OCP 30

3.6 20 Frequency [kHz] Frequency 10 3.4 50 100 150 200 250 300 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Input voltage [Vac] Output current [A]

Output power vs.Input power Output power vs.Input power 0.6 1.6 Vin=100Vac Vin=100Vac Vin=230Vac 1.4 Vin=230Vac 0.5 1.2 0.4 1.0

0.3 0.8 0.6 0.2

Input power [W]powerInput 0.4 Input power [W]powerInput 0.1 0.2

0.0 0.0 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.30 0.50 0.70 0.90 Output power [W] Output power [W]

Output current vs.Input power Output current vs.Input power 0.6 1.6 Vin=100Vac Vin=100Vac Vin=230Vac 1.4 Vin=230Vac 0.5 1.2 0.4 1.0 0.3 0.8 0.6 0.2

Input power [W] powerInput [W] powerInput 0.4 0.1 0.2 0.0 0.0 0.00 0.01 0.02 0.03 0.04 0.05 0.05 0.10 0.15 0.20 Output current [A] Output current [A]

Input voltage vs.Input Power 35 No Load 30

10 Input Power[mW] Input 5

0 50 100 150 200 250 300 Input voltage [Vac]

7．Switching waveforms (Vds)  Rated Load (5V/3A) Vin=100V Vin=230V

CH1:100V/div ,8usec/div

 Middle Load (5V/1A) Vin=100V Vin=230V

CH1:100V/div ,8usec/div  Light Load (5V/0.1A) Vin=100V Vin=230V

CH1:100V/div ,20usec/div CH1:100V/div ,1msec/div

 Light Load (5V/0.02A)

Vin=100V Vin=230V

CH1:100V/div ,2msec/div

 No-Load (5V/0A)

Vin=100V Vin=230V

CH1:100V/div ,2msec/div

9.Bill of material Component Item Value Part. No Maker Note T1 Transformer Lp=635uH ST13FE005-53-1 Np:Ns:Nps=62:5:13 NF1 Noise filter 4A,10uH SFC-13R1-04100 SEKISHIN NF2 Noise filter 0.5A,13mH PLA10AN1330R5D2 MURATA FB2 Bead HF70BB3.5X5X1.3 TDK C1 Film capacitor 275V,0.47uF LE474-M OKAYA C2,3 Ceramic capacitor 250V,2200pF DE1E3KX222M_L01 Murata C4 Electrolytic Capacitor 450V,33uF UCS2W330MDH Nichicon C5 Film capacitor 630V,0.01uF ECQE6103KF Panasonic C6 Ceramic capacitor 50V,220pF GRM1882C1H221J MURATA C7 Ceramic capacitor 50V,1000pF GRM188B11H102K MURATA C8 Ceramic capacitor 50V,100pF GRM1882C1H101J MURATA C9,C16 Ceramic capacitor 50V,0.1uF GRM188R11H104K MURATA C10 Electrolytic Capacitor 50V,47uF 50ME47AX SUN CON C11 Ceramic capacitor 250V,4700pF DE1E3KX472M_L01 C12 Film capacitor 400V,0.1uF ECQE4104KF Panasonic C13 Ceramic capacitor 1KV,1000pF DEHR33A102K Murata C14,15 Electrolytic Capacitor 10V,3300uF 10ME3300WA SUN CON C18 Ceramic capacitor 50V,0.01uF GRM188B11H103K MURATA R3 Fixed Metal Film Resistors 100kΩ,2W R4,R21,R28 Resistor 10KΩ,1/8W R5 Resistor 22Ω,1/4W R6 Resistor 100Ω,1/4W R7 Fixed Metal Film Resistors 0.51Ω,2W R8,R11 Resistor 4.7KΩ,1/4W R9,20 Resistor 330Ω,1/8W R10 Resistor 160kΩ,1/8W R12 Resistor 1kΩ,1/8W R17 Resistor 1Ω,1/4W R18 Resistor 470Ω,1/8W R19 Fixed Metal Film Resistors 10Ω,2W R22,26 Resistor 47kΩ,1/8W R23 Resistor 0Ω,1/8W R25 Resistor 47KΩ,1/8W R27 Resistor 68Ω,1/8W DS1 Diode 600V,1A S1WB(A)60-7101 Shindengen DS2 Diode 45V,20A YG865C04R Fuji D1,D2 Diode 600V,0.7A CRF03 Toshiba D3 Diode 1KV,0.5A UF4007 Vishay D4,5 Diode 200V,1A CRH01 Toshiba ZD2 Zener Diode 2.7V,200mW HZU2.7B1 RENESAS ZD3 Zener Diode 5.6V,200mW HZU5.6B2 RENESAS Q1 Nch-MOSFET 600V,11A FMV11N60ES FUJI TO220F IC1 PWM-IC FA8A71N FUJI IC2 IC HA17432HUP RENESAS PC1,PC2 Photo transistor TLP781F Toshiba F1 Fuse 250V,1.6A SLT250V 1.6A ZNR1 Varistor ERZV10D471 Panasonic

10.Transformer specifications

Winding Pin layer Wire type turn order Start Finish 1 NP1-1 UEWφ0.35 62 1 2 2 NS1-1 TEXφ0.5×2557 3NP2UEWφ0.31343 4 NS1-2 TEXφ0.5×2568 5 NP1-2 UEWφ0.35 62 1 2

bobbin BEER-25.5-118CPFR core PC40EER24.5-Z Gap 0.2mm(side gap) inductance 1pin to 2pin 635uH±10%

Notice

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