开关电源设计详解

1、 ZZ Z F Q W U R Q L F V F R P .偸: PCB Layout. .偠.(DA-14B33: PCB Layout .: 偠 DA-14B33 . : Gauss B 100(maxB(max = 佅 (GaussLp = (uHIp = (ANp = ( Ae = (cm 2B(max TDK Ferrite Core PC40100 B(max3900 Gauss 30003500 Gauss power Adapter( 3000 Gauss 催佅 Ae 催 Power : Vin(min Vin(win催 Power 催 : Bobbin Bobbin 6A/

2、mm 2 Duty cycle ( : Duty cycle Duty cycle 50% Duty cycle 50% xDVin D x V Vo Np Ns D (min1( N S = N P = V o = V D = 乎 Vin(min = ZZ Z F Q W U R Q L F V F R PD = (Duty cycle Ip :I Iav Ip '21KxDx Vin Pout Iav (minfPx Lp Vin I (min'Ip = Iav = Pout = K f PWM 乥 : MOSFET Stress( : (Stress 264V(380V

3、: 5V 乏TL431TL432 乏 Photo coupler TL431 Gauss x NpxAeLpxIpB 100(max B(maxB(max 催 乏 DA-14B33 : 13.2W(3.3V/4ACore = EI-28 ( =10mm Margin Tape = 2.8mm( =4.4mm. : PC-40 =EI-28Ae=0.86cm 2 ( =10mm Margin Tape 2.8mm 4.4mm. 47uF/400V Vin(min 90V :Ax x x x Vin PoutIin 42.05T K N P 0.32¸ =Ax x 286.11024.0

4、14.342.02¸¹·¨©§ =ZZ Z F Q W U R Q L F V F R P =Ax x 07.440289.014.34¸¹·¨©§ 4P =A 02.11407.44 =.4 Duty cycle:Np=44T Ns=2T V D =0.5(schottky DiodeDD Ip :IIav Ip ' 21Ax x xD x Vin Pout Iav 435.0482.07.0902.13(minK A Kx u f D x Lp Vin I 603

5、.045482.0160090(min'A Ip 737.02603.0435.0 : =12V128.31 A N Ns 128.321 A N N A1=6.30.23¸ =13.19.4 N A1=6Tx2P =11.4VMOSFET Stress( :MOSFET(Q1 = 催 (380V+ D V Vo Ns Np44380 =463.6VZZ Z F Q W U R Q L F V F R PDiode(D5= (V o+NpNsx 催 (380V =3804423.3x=20.57VDiode(D4=380(2V x NpNsN A 催 =3804446.6x=

6、41.4V : 3.3V TL431Vref 2.5V photo coupler 1.2V Photocoupler TL431 乏 N A2= 4T 0.35¸ =.4 N A2 4Tx2P228.3A A V N Ns VGauss x x x Gauss x NpxAe LpxIp B 3.311610086.044737.01600(100(max :( : (DA-14B33 Schematic FS1:0.32 x1Px22T0.32 x1Px22T0.35 x2Px4T0.35 x4Px2T0.23 x2Px6TZZ Z F Q W U R Q L F V F R P

7、 Iin Iin (0.42A 2A/250V 乏Pin(max Iin 乱 TR1( : C1( Iin Power 乏 Iin Spec (115V/30A 230V/60A ( SCK053(3A/5¡C1 乏 ( Power VDR1( : Power 乏 AC (Fuse Power( 07D471K CY1CY2(Y-Cap: Y-Cap Y1 Y2 AC Input FG(3 PinY2- Cap AC Input 2Pin( L NY1-Cap Y1Y2 (Y1 (Y1 Y2 Y1 FG Y2-Cap Y-Cap EMI 乏 乬(Leakage Current 乏 乏

8、(3Pin 750uA maxCX1(X-CapRX1:X-Cap EMI EMI Conduction Radiation Conduction : FCC Part 15J Class B CISPR 22(EN55022 Class B FCC 乥 450K30MHz CISPR 22乥 150K30MHz Conduction乥 偠Radiation 乏 偠 偠X-Cap 乥(150K M EMI X-Cap EMI ( 催X-Cap 0.22uf ( 0.22uf 乏 (RX11.2M 1/4WLF1(Common Choke:EMI Conduction 乥 乏 EMI Commo

9、n Choke ( EMI 催BD1( :AC DC Iin 1A/600V 600V C1( :C1 ( Vin(min Vin(min 催 催 偠Vin(min AC Input 90V132V (Vc1 催190V 200V ;AC Input 90V264V( 180V264V Vc1 催380V 乏 400V D2( : FR105(1A/600V BYT42M(1A/1000V : ( V F (FR105=1.2V BYT42M=1.4V R10( :ZZ Z F Q W U R Q L F V F R P PWM IC VCC 3843 VCC 乏 8.4V(Min. Load

10、 VCC 催 ( C7( : PWM IC 100uf/25V Z1(Zener : 催 催 3843 VCC 3843 Pin3 Zener Diode Zener Diode Pin3 1V .Z1 催Z1 乏 Q1V GS (1/2W .R2( :3843 R2 C7 3843 VCC R2 turn on Pin R2 turn on Pin 220K /2W M.O .R4 (Line Compensation:催 3843 Pin3 90V/47Hz 264V/63Hz (750K 1.5M 1/4W R3C6D1 (Snubber: Snubber Snubber :1. Q1

11、off Spike Snubber Spike Q1 2. Snubber EMI.D11N4007(1A/1000VEMI .R32W M.O.C6 ( 500V Q1(N-MOS: 3A/600V 6A/600V 6A/600V R DS(ON3A/600V I DS 3A 3A/600V 偠 6A/600V 催3A/600V Q1V DS乱 R8:R8 Q1 Q1 R7(Rs :3843 Pin3 催1V R7 乏R4 催 2W M.O.R7 R4 3843 Pin3 0.85V0.95V ( 1V 乊 1VR5C3(RC filter:3843 Pin3 R51K 1/8W C3102

12、P/50V C3 ( 3843 Pin3乊 1V; Pin 乬 R9(Q1 Gate :R9 EMI Q1 turn on / turn off EMI Q1 催 ( turn off ; Q1 turn on / turn off Q1 催EMI 51-150 1/8W ZZ Z F Q W U R Q L F V F R PR6C4( 乥:3843 乥 Data Sheet R C 乥C410nf ( 5%R6 DA-14B33C4103P/50V PE R63.74K 1/8W 乥45 KHz C5:RC filter 催 101P/50V U1(PWM IC:UC3843BN KA38

13、43 2KHz f T 乬( :EMI 乬乬 KA3843 UC3843BN R1R11R12C2( :3843 Error AMP( R1R11R12C2 Error AMP C2 ( U2(Photo coupler (Photo coupler ( TL431 U2 3843Pin6 (output off (Low Q1Photo coupler (primacy to secondary 5.6mm R13( :Photo coupler R13 Photo coupler U2 ( R13 Photo coupler U2 U3(TL431R15R16R18 16/151816/1

14、3R R R R R xVref Vo 38V( TL431 V KA36V Photo coupler V F V o 38V TL431Vref 2.5V R15 R16 R15R16 ( 2K ¡ R14C9( : Dynamic load D4( : 3.3V (Output V oltage RegulatorTL431(Vref=2.5VTL432(Vref=1.25V 乏 Photo coupler TL431 U2 U3 (10mA 100V 1N4148(0.15A/100V C8( :U2 U3 1u/50V ZZ Z F Q W U R Q L F V F R

15、PD5( : D5: DA-14B33 4A 10A (Schottky 偠 D5 催 乏 15A 10A V F 15A V F 40V 偠 15A/40V Schottky C10R17(snubber :D5 spike spike (D5 snubber spike EMI R171/2W C10 500V snubber (264V/63Hz R17,C10 C11C13( : (LXZ YXA : Ripple 乱 乱 R19( : 乏 乱( 乱 L3C12(LC :LC L3 ( C12 偠:( 偠 偠QE 偠偠 偠 偠 偠 DA-14B33偠 (偠乍 偠:3843 PIN3 (

16、full load 4A :90V/47Hz = 0.83V 115V/60Hz = 0.83V 132V/60Hz = 0.83V 180V/60Hz = 0.86V 230V/60Hz = 0.88V 264V/63Hz =0.91VDuty Cycle , f T :ZZ Z F Q W U R Q L F V F R P%V T %V T Vin(min = 100V (90V / 47Hz full load Stress (264V / 63Hz full load : Q1 MOSFET:D5: D4: ( Pin max.:.V ZZ Z F Q W U R Q L F V F

17、 R P.V Static (full loadPin(w Iin(A Iout(A V out(V P.F. Ripple(mV Pout(w eff 90V/47Hz 18.7 0.36 4 3.30 0.57 32 13.22 70.7 115V/60Hz 18.6 0.31 4 3.30 0.52 28 13.22 71.1 132V/60Hz 18.6 0.28 4 3.30 0.50 29 13.22 71.1 180V/60Hz 18.7 0.21 4 3.30 0.49 30 13.23 70.7 230V/60Hz 18.9 0.18 4 3.30 0.46 29 13.22 69.9 264V/60Hz 19.2 0.16 43.30 0.45 2913.23 68.9Full Range (0.3A-4A (偠 (