Text preview for : Flyback-R01.pdf part of SHEMI NA KOMPUTARNI ZAXRANVANIYA PSU
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() 2005, 2006
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.
1.
( , Flyback, ) . , . , . . . , , . , , ( Forward, ) , , . - , . , , . «» 12 2. , - (, ) - UC3842 UC3845. , , . «» . , UC3844, TOP Switch Power Integration, .
2.
, , . , . 30-50 . : . , , . , ,
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. , 5 10 17, . , Low-ESR WG Jamicon 3 . , . 50- , 24 2, 3,5, (, WG 1000uF*50V 12,540 2,48 100 +105°). , , , . , . , . . , , , -, , , -, . . -, , , . -, . , 50- 24, 85% . (Active Clamp Forward) 92%. 8,8, 4,3 ! , . . « ». , . , , , . , 5 10, 12 0,1 24, 20, . , , . , , 150-200 ( ), , 30 . . DC-DC , . -, ( ) , , -, DCDC . , , -
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. DC-DC , . . . , 1206 22uF 6,3V 5 300, $0.2. , ESR, , . DC-DC 5 1, 350, 1206 22uFx6.3V 40mV 40° +100°. , DC-DC , DC-DC 15-20. , , DC-DC , . , . , , .
1.
T1 + V IN I pri in Rcl Ccl N1 Dcl N2 V sec Cout Vout I cout I sec Dout +
V gs
Q1
V ds
.1 . 1 , . 2 . (discontinuous). ,
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, V gs . (continuous) , I pri . Vds(max.) . (V in + V refl. ) f, T=1/f. (t0-t1) Q1 ( ) V ds tON, (Duty Circle, D) D = tON/T. I sec (t0-t1). t0 , U out . , , V sec Q1 V in(refl.) . (I sec - I out ) . Icout I out , t0 t1 t2 t3 t4 , . 2 . . , /. LPRI , . ( ) , . POUT, : A= POUT , f
- (), f .
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L I PRI , , 2 :
2
, : A =
I=
2*A 2 * POUT = L PRI * f * L PRI
, , dI U = L . dt , (, ). . : I RMS = I PRI * D 3
, : PDC = I 2 * R DS , RDS . RMS . . DOUT . N1 , N1 N2, K = , N2 DOUT : VDOUT = VIN + (VOUT + VD ) , VD . K
, , . (t1-t2). , IPRI , VMAX. , . , , , .
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: PSW = IPRI * VMAX * t SW * f 2
tSW , , , . , . ( ). DC-DC , , : PSW ,CAP =
2 C p * VSW * f
2
+ V IN DOUT
, VDS(MAX) (VREFL). , , , , . , . RCD . , RCL CCL TVS (Transient Voltage Suppressor) , . , , , , . , LL(PRI)
I SEC
L L(PRI) R CL C CL V CL COUT RL
L M(PRI) D CL
L M(SEC)
I CL
V CL
V REFL
VIN V GS
I PRI
I L(PRI)
I PRI
I CL
I TR
t0
t1
t2
. 3
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. . 3 , . , CCL . , t0 , . , , .. VREFL, , (VCL VREFL). t0 , .. IPRI, tCH: t CH = L L ( PRI ) * I PRI VCL - VREFL
CCL, , : I CH = I PRI * I 2 * L L ( PRI ) * f D I PRI * t CH * f = = PRI 2 2 2 * (VCL - VREFL )
, , , VREFL. DCL , , , . , , . , , , , . , t1 (VCL VREFL), : I LL ( PRI ) = (VCL - VREFL ) * t L L ( PRI )
, , , , , COUT, . t1-t2 . , . , «» , .
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tRR : I LL ( PRI ) = (VCL - VREFL ) * t RR L L ( PRI )
: I RR = I LL ( PRI ) * D 2 = (VCL - VREFL ) * t 2 * f RR 2 * L L ( PRI )
t2 DCL , LL(PRI) , , . CCL RCL, , : I DCH = VCL R CL
CCL, : I CH = I DCH + I RR «» , «» , IRR: I 2 * L L ( PRI ) * f PRI 2 * (VCL - VREFL ) = VCL R CL
RCL :
R CL =
2 * VCL * (VCL - VREFL ) I 2 * L L ( PRI) * f PRI
, , . «» RCL. , : PRCL =
2 VCL R CL
TVS , TVS , ,
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. , , VCL (, , TVS): PTVS = I 2 * L L ( PRI ) * f PRI 2 * (VCL - VREFL ) * VCL
t1 , TVS , , , RCD . . : POUT = 24.3 W VIN = 300 VDC VCL = 228V VREFL = 164V f = 93.5 kHz IPRI = 0.84A LL = 21 uH CL = 10 nF Q1 IRFRC20 (. 4). . , . , . 2,7MHz, , , 110pF. 720, , , . 92mA, .. 88.0%. (. 5). DCL HS1J 75ns. VCL=228V 21, , 25.
. 4
. 5
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(VCL VREFL) , , RCL 2.5W 2.9W. , , 99mA, 81.8%. (. 6). DCL «» S1J 2,5us. , . 6 150K. (0.35W), . , , . , 96mA, 84.4%. (. 7). TVS 220V (P6KE220) HS1J. TVS . 7 . , , TVS 2.5W (, , ), TVS. 101mA 80.2%. . , t1 ISEC = IPRI*K, t2 . , , . ISEC - IOUT IOUT ( , ). .
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:
2 I RIPPLE = I 2 (SEC ) - IOUT , RMS
IRMS(SEC) , : I RMS(SEC) = ISEC * D 3
t1-2 . T , - , : , D = PDOUT = ISEC * VFD ( DOUT ) (t1 - t2) VOUT, LSEC : t1-2 = LSEC * ISEC VOUT + VD
(t2 t3). t2 , . « », , , / : FOSC = 1 2 * * L PRI * C E
. , . , - , - . t3 .
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2. «»
.8 «» UC3844. , .
D4 + V IN + 1 R1 R3 C2 D2 D1 R4 + T1-2 C3 Q1 C4 R5 C5 U1
1 2 4 8 COMP FB RC REF VCC OUT CS GND 7 6 3 5
L1 +
T1-1
T1-3
+ C8
+ C9 Vout U2-1 R12
R2
R9
D3
R13 R14 C10
R15
R10 U3
R8 U2-2
R7
C6
C7
R11 C11
R16
.8 , . : : 220VAC±20% (176-264)VAC /: 12VDC, 2A (POUT=24W) : 100kHz (C1). 100- . , , . , 1-2uF 220VAC±20%, 2-3uF 85-270VAC.
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, VIN(MIN) VDC(MIN): arccos VIN ( MIN ) V POUT ( MAX ) DC ( MIN ) C1 = * 1 + 2 2 * F * (VDC ( MIN ) - VIN ( MIN ) ) : VDC( MIN ) = 176VAC * 2 = 249VDC . VIN(MIN)=200VDC. 50Hz. 31uF. , 33uF*400V . (U1). UC3842UC3845. , . : D 50% . , , : , , . : (Current Mode), D>50%. , . , . , , . 50 , . , , D. · . · . , «», , , . , UC3844A . (UCC380(0..5), UCC3813), ( ) . (C5 R8). . 5 R8 , (8.3mA typ.). ·
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«» . , R8 5 , . «» , D 50%, , R8 , 25-30. : f = 1.72 , C5 * R 8
UC3844 UC3845 , 50- . 25 344pF. 330pF, R8 26.06, 1% 26.1. - , D. 5 NP0 ±5%. ±5% . : : 99.8kHz : 90.6kHz : 110.1kHz «» . 5 8.3mA (7.6mA min.), 1.7V ( ). «» : t DEAD = C5 * 1.7V = 74ns , 7.6 mA
. 47%, . , D. D=47%. 9.1us, : tON = T*D = 4.28us , D=49%: tON = 4.46us toff = T tON = 4.64us. , 4.28us, 4.64us. (1). . , 20%. , .
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, 4.28us , : A= POUT f
: I= 2*A 2 * POUT = L PRI * f * L PRI
, tON : dI VIN V *t , tON : I = IN ON = dt L PRI L PRI LPRI VIN(MIN), PMAX = POUT*1.2 fMIN ( ) . L PRI =
2 2 VIN ( MIN ) * t ON * * f MIN
2 * PMAX
: L PRI 200V 2 * 4.28us 2 * 0.85 * 90.6kHz = 0.98mH 2 * 28.8W
: I PRI = 2 * PMAX = * f MIN * L PRI 2 * 28.8 W = 0.87 A 0.85 * 90.6kHz * 0.98mH
: I RMS = I PRI * D MAX 0.5 = 0.87A * = 0.36A 3 3
. tOFF , . VOUT VDOUT. , 0.5V.
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, : VOUT + VDOUT = LSEC * ISEC t OFF
, ` 2 P (V + VDOUT ) * I OUT LSEC * ISEC . = A = OUT = OUT f f 2 LSEC : LSEC = (VOUT + VDOUT ) * t 2 * f MIN OFF 2 * I OUT ( MAX )
: LSEC (12V + 0.5V) * 4.64µs 2 * 90.6kHz = 5.08µH 2 * 2.4A
, : ISEC = (VOUT + VDOUT ) * t OFF (12V + 0.5V) * 4.64µs = = 11.4 A L SEC 5.08µH
: K= L PRI = LSEC 0.98mH = 13.9 5.08µH
: VDS = VIN ( MAX ) + (VOUT + VDOUT ) * K = 373VDC + (12V + 0.5V) * 13.9 = 547V , , . , , 0.98mH, 5.08uH. 547V 600- , . , 500V. , , , . - 500V.
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: K= VDS( MAX ) - VIN ( MAX ) VOUT + VDOUT = 500V - 373VDC = 10.2 12V + 0.5V
: L PRI = LSEC * K 2 = 5.08µH * 10.2 2 = 529µH : I PRI = 2 * PMAX = * f MAX * L PRI 2 * 28.8 W = 1.2 A 0.85 * 90.6kHz * 529µH
10% 40%! , , . . , , , 10% . , , . , -. , VDS(MAX)=547V K=13.9. . . , . , , 6 ( ). , , . , - , 19-20. , , . , , ( , ). , , , . 100..400kHz , N87 Epcos (3F3 Ferroxcube, "R" Magnetics, PC-44 TDK .). , 0,25-0,3T. , µ- ( ). -60 -140, (Micrometals, Epcos, Magnetics). ,
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, . , ( 0.5%), . , . 100kHz , . EFD-25 N87. , 160, 250 315nH/². , ( ), , . , : AE = A E ( 0) * l E µE * g , :
AE(0) ( ) LE E g , 160 nH/². 0.98mH: N1 = L PRI 0.98mH = = 78 AL 160nH / T 2
4.28uS VIN(MIN)=200V. EFD-25 AE=57mm². : B = VIN ( MIN ) * t ON A E * N1 = 200VDC * 4.28µs = 0.19T 57mm 2 * 78T
, . f=100kHz B=B/2=0.1T 130kW/m³ ( : 130mW/cm³). Ve=3310mm³=3.31cm³. PCORE=430mW. , . 100° 50mW/cm³ 166mW. , . , 100°, ( , .). , 250nH/². , 62 , 0.24.
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, 660mW. , , . , . 5.08uH, : N2 = LSECI 5.08uH = = 5.6 AL 160nH / T 2
5.08uH, 5 , 4uH . 15.6, VDS = VIN ( MAX ) + (VOUT + VDOUT ) * K = 373VDC + (12V + 0.5V) * 15.6 = 568V 600- . 50V (, , ). =14.16 N1=70.8 - > 70 784H. , ( ). : I PRI ( MAX ) = 2 * PMAX = * f MAX * L PRI 2 * 28.8W = 0.98A 0.85 * 90.6 kHz * 784µH
: I PRI ( NOM ) = 2 * POUT 2 * 24 W = = 0.85A * f NOM * L PRI 0.85 * 99.8kHz * 784µH
: t ON = I PRI ( NOM ) * L PRI VIN ( NOM ) = 0.85A * 784uH = 2.14uS -> DPRI = 0.214 311V
: I PRI( RMS) = I PRI( NOM) * D PRI 0.214 = 0.85A * = 0.23A 3 3
: ISEC = I PRI ( NOM ) * K = 0.85A * 14 = 11.9A
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: t SEC = ISEC * LSEC 11.9A * 4.0 uH = = 3.81us -> DSEC = 0.38 VOUT + VDOUT 12V + 0.5V
: I RMS(SEC ) = I SEC * DSEC 0.38 = 11.9A * = 4.24A 3 3
. I DC(SEC) = ISEC * DSEC 0.38 = 11.9A * = 2.26A 2 2
2 DSEC DSEC 0.38 0.382 - = 11.9A * - = 3.58A 3 4 3 4
I AC (SEC ) = ISEC *
11.5 16. , . 13, : N BIAS = (VBIAS + VD ) * N 2 (13V + 0.6V) * 5 = = 5.44 VOUT + VDOUT 12V + 0.5V
, 5 , 6 . 11.9V, 14.4V. , (11.5V). : : TON(NOM) = 2.14us N1 = 70 LPRI = 784uH IPRI(MAX) = 0.98A IPRI(NOM) = 0.85A -> IRMS(PRI) = 0.23A VDS(MAX) = 548V : TON(NOM) = 3.81us N2 = 5 LSEC = 4.0uH ISEC(NOM) = 11.9A -> IRMS(SEC) = 4.24A IDC(SEC) = 2.26A IAC(SEC) = 3.58A
() 2005, 2006
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: NBIAS = 6 . . , . , ( ) . , . , , . , . , .. , , , ( ), . , , . , , 6. , . (1- ) . . , : (1-) (1-) (1-). , «». 6 , . . . . 9.
3mm 3mm 2 1 2 1 16.4mm min
. 9
() 2005, 2006
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dX: 1.17 us X: 4.63 us . . . / , . . 1 > 1) Ref B: 100 Volt 1 us , . 10 . 1 0.19, 2 dX: 2.03 us . X: 6.93 us 0.94mH. . . 10 1, . 11 2. , 1 > 1) Ch 2: 100 Volt 1 us . 11 . 1 37pF, 2 111pF. 24W 83.0%, 79.6%. 1.23W , . , , . 3 1350F-1 0,0254. . . : . 16.4 2*3 = 10.4. 10.4 : 70 = 0.15, ( ) -0.11 (AWG37) 1.7/. , . 34.4. , 4.1 ( ), 25° PPRI = I 2 ( PRI ) * R PRI = 0.23A 2 * 4.1 = 217mW , RMS 100° - 293mW. : , , , 6 .
() 2005, 2006
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. 12 : , . , : D PEN = 7,5 f
, Q . , 0.83 . . 12 RAC/RDC. IDC RDC, IAC RAC. :
2 P = PDC + PAC = I 2 (SEC ) * R DC + I AC (SEC ) * R AC DC
. 38. ( , ), , . , 10.4 : 3 = 3.47. , 100kHz . 0.24, 0.29. , -0.29(AWG29) 0.34,
() 2005, 2006
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10 . , 10 0.29 : 10*0.29 8*0.36 6*0.45 4*0.72 RDC 5.1m 4.0m 3.5 m 2.0 m PDC 26.2mW 20.4mW 18mW 10.2mW RAC/RDC 1.5 1.8 3.5 8.0 RAC 7.65 m 7.2 m 12.2 m 16.0 m PAC 98mW 92.3mW 157mW 205mW R 124mW 113mW 175mW 215mW
, 8 0.36. , (, , ), . . : 6*0.31 4*0.44 2*0.93 RDC 48m 32m 16m PDC 247mW 161mW 82mW RAC/RDC 1.1 1.6 2.8 RAC 53 m 51 m 45m PAC 677mW 656mW 577mW R 924mW 817mW 659mW
, . 8 0.36., , , 113mW 25° 142mW 100°. : +25° 430mW 217mW 113mW 760mW +100° 166mW 293mW 142mW 601mW
. , , . 15cm², : t
0 CORE
P [mW] = S [cm]2 S
0.833
430mW = 2 15cm
0.833
16°C
() 2005, 2006
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7cm², : t
0 W
P [mW] = S [cm]2 S
0.833
330mW = 2 7cm
0.833
25°C
, 250nH/², : : 56 -0.14(AWG35) : 5 : 4 10 -0.40(AWG26) +25° 660mW 111mW 87mW 858mW +100° 230mW 148mW 116mW 494mW
, , . 1. : 1. , . , , , , . , ( ) , . , . DC-DC ,
. 13
() 2005, 2006
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, ( ). . , , . . . 13. 1 4 , 2 3 . , , . (, ±12V), (. 14). ( , ), , . .
. 14 2. (Triple Insulation) -, ( ), , , , ( ) , , . / . 3. ! , , , . , . 4. .
() 2005, 2006
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, .
(Q1). , . , . , . 0.98, 600- . International Rectifier: IRFR1N60A RDS = 7.0 Qg = 9.3nC typ. IRFRC20 RDS = 4.4 Qg = 12nC typ. : P IRFR1N60A = 7.0 *0.23A² = 370mW P IRFRC20 = 4.4 *0.23A² = 233mW , , 120° . . (tFALL). : t IRFR1N60A = 20ns t IRFRC20 = 25ns : POFF = : PSW ( IRFR1 N 60 A ) = PSW ( IRFRC 20 ) = 481V * 0.85A * 20ns * 100kHz = 409mW 2 (VIN + VOUT ) * IPRI * t FALL * fSW 2
481V * 0.85A * 25ns * 100kHz = 511mW 2
, , . , / , . ( , ), .
() 2005, 2006
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50pF ( , ), VIN+VREFL IPRI : t CHARGE = C EQV * (VIN + VREFL ) 50pF * (311V + 177V) = = 29ns IPRI 0.85A
IRFRC20 500pF, 200V . , , ! . 15 VG, 2V/div ( , IS), ( , VD) ( , IS, 0.2A/div VG). 25ns/div. , , VD, 100V/div . DC-DC . . 15 , . . , , :
3 2 1>
PCAP =
C EQV * U 2 DISCH *f 2
, UDISCH ( «» ). CEQV = 50pF, : PCAP = 50pF * 311V * 100kHz = 242mW 2
, .
() 2005, 2006
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, : P(IRFR1N60A) = PDC + PCAP = 370mW + 242mW = 612mW P(IRFRC20) = PDC + PCAP = 233mW + 242mW = 475mW IRFRC20 . DC-DC , , ( ). IRFRC20 . 80° , 110°/W. 105° 1.7 , .. 6.8, 360mW. .. - 600mW, 66°. 14° , 130mW . , . ( 311V). ( ) 16nC. (- ), 3nC. , QG*fSW = 16nC*100kHz = 1.6mA, 3nC*100kHz = 0.3mA. , , 2mA. (R9, D3). , ( DC-DC ). R9 D3. D3 , BAS16 1N4148 . R9 . , , (Continuous Mode). R9 , . CEQV = 50pF, : = C EQV * Vin 50pF * 311V = 180ns 0.1 * I PRI 0.1 * 0.85A
() 2005, 2006
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, , : IGATE = Q G 16nC = = 89mA 180ns
15V, 5V, 10V, R9 : R9 = VCC - VMILLER 15V - 5V = = 113 IGATE 89mA
, , R10, C7 , . . R9 , . , R9 . , R9 = 120. (R11, R10, C7). , , . : I PRI = 2 * POUT 2 * 24W = = 0.89A * f MIN * L PRI 0.85 * 90.6kHz * 784µH
( 3) (0.9V). R11 : R11 < VPIN 3( MIN ) I PRI = 0.9 V = 1.01 0.89A
1 1%, , , . : PR11 = I2 ( PRI ) * R11 = 0.23A 2 * 1 = 53mW RMS , 0805. DC-DC , ,
() 2005, 2006
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, ( ( 4) ( 3)). . . R10, C7 . , , . , , , R9, .. 180ns. , 100-150ns. 50-150ns, . , , R10 , 300 1K ( ), , R10 = 470. C7 : C9 = (100...150)ns = = (212...320)pF R10 470
R10 = 470 9 = 330pF , . , , ( !) . (R1, R2). 3 R1 R2. , UVLO (Under Voltage Lock Out). , . . - 1206 250V . UC3844A ISTART = 0.5mA max., VSTART = 17.5V max. : (R1 + R 2) VDC ( MIN ) - VSTART ISTART = 249V - 17.5V = 214k 0.5mA
R1=R2=100K. : PR1, R 2 = (VDC( MAX) - 14.5V)2 R1 + R 2 = (373VDC - 14.5V)2 = 0.64 W 100K + 100K
, 1206, 0.5W.
() 2005, 2006
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, - 1206. , UCC3813. , . , , . 8. (D1, R4, C3). , , , . , , . , . , , . , C3. , , , . , 3. (17mA max) ( , 2mA). IPWM = 19mA max. (14.5 17.5)V, (8.5 11.5)V, VHIST = 6V. , . , , 4700F, , : t START = COUT * VOUT 4700µF * 12V = 28.2ms = IOUT ( NOM ) 2A
C3: C3 > IPWM * t START 19mA * 28.2 ms = = 89.3µF VHIST 6V
, 100F*25V, , 4700F. , , . , . 220VAC.
() 2005, 2006
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, C3 19mA VHIST = 6V: t ON = C3 * VHIST 100µF * 6V = = 32ms IPWM 19mA
3 200 , : ICHARGE = VIN ( NOM) - VSTART ( MAX ) R1 + R 2 = 311V - 17.5V = 1.47 mA 100K + 100K
: t OFF = C3 * VHIST 100µF * 6V = 408ms = ISTART 1.47mA
tON:tOFF 0.08. 3 , .. tON : tOFF = ICHARGE : IPWM. , 12.5 . , . , . 3 . , R4. RC . , , , . R4 , , . (10..47). : UC384(2-5) , UCC3813 ( , , (10..47)H). , , . (D2, R3, C2). , . 220V, 264VAC (372VDC) . 2
() 2005, 2006
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, . 2 1206 0.01F, 500V. , . D2 2 : U C 2 = I 2 * L L ( PRI ) I CH PRI = C C 2 * f 2 * CC 2 * ( VCL - VREFL )
C2 C2 + . RCD «» TVS, , . «» 2.5µs S1J, R3 , ( ) VCL 220V. R3 = 75K. , , : PR 3 =
2 VCL 220V = = 645mW R3 75K
1206, VCL 1206. 1206 27 5%. «» , , - C2 , . , 1N4007! , , . (D4). , . , 24V, 100V. «» : VD 4 = VIN + VOUT K
() 2005, 2006
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: VD 4 = 373V + 12V = 41V 14
60- . , , 4.24. , ( - - ). 50WQ06N 6CWQ06N DPAK International Rectifier. 6CWQ06N . (50WQ06N). 4.24 +25° 50WQ06N 0.53V, , , : 4.24*0.53V = 2.25W. +125° 2.12W. , . 220VAC 34.2V, 0.08mA, +125° 11mA. TON(NOM) (2.14 s), ( +125°): Prev = Irev * VD 4 * TON ( NOM) * f = 0.08ma(11mA) * 34.2V * 2.14µs * 100kHz = 0.5mW(80mW) , , . , 50% . , , . , , , . D4 RdCd . , , . 100pF, (180..200)pF. : L * C = R d * Cd : Rd = L LEAK (SEC ) * (C TR + C D 4 ) Cd = 4µH * 0.02 * (50pF + 100pF) = 17 200pF
() 2005, 2006
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20 . , , , , , , Cd:
2 PRD = Cd * VD 4 * f = 200pF * 34.2V 2 * 100kHz = 23mW
0805. (8). . -, , . , , , 10 20 (nCP) . VOUT. 8 : C8 = I OUT * n CP VOUT * f
, / ( ), . , , . . -, (ESR) . nCP = 10 VOUT = 0.5V : C8 I OUT * n CP 2A * 10 = = 400µF VOUT * f 0.5V * 100kHz
:
2 IC8 = I 2 (SEC ) - IOUT = 4.24A 2 - 2A 2 = 3.74A RMS
ESR (LowESR series) HITANO (EXR series). . , . , . 8 , . , 330F*63V 1021, 680F*50V 1326.
() 2005, 2006
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LowESR , . 593D Vishay. «» (7.3x4.3x4.0mm) 150F*16V. , . ESR . , . , 1206 22F*6.3V, 10F*16V. , , DC DC . , . 16 LC ESR , . . 16 (350kHz) DC DC 5V 1. 1206 22F*6.3V ! 680F*50V 1331 ESR 39m. ESR. : VOUT , p - p = I LOAD * t ON + ISEC * ESR (C8) , C8
ILOAD , tON . : VC8, p - p = 2A * 2.14µs + 11.9A * 39m = 0.47V 2 * 680µF
, , . (L1, C9). , , . LC , RC . LC . LC ,
() 2005, 2006
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1/5 . , . 8, , L1 C9, , : VOUT , p - p = VC8 , p - p 4 * * f 2 * L1 * C9 + 1
2
, , /. L1 . SMT 0805 (Ø8 5) 3.3H, 4.6 22m. 88mW, . 50mV C9: C9 > V8, p - p - VOUT , p - p 4 * VOUT , p - p * * f * L1
2 2
=
0.47 V - 0.05V = 6.4µF 4 * 0.05V * 2 * 100kHz 2 * 3.3µH 2
10F C9, ESR , . : = 1 1 = = 174ms -1 L1 * C9 3.3µH * 10µF
. (U3, R14, R15). SMPS TL431 (, .). . ( VRef. = 2.5V), . TL431 . , R14, R15 , . R15. (4A max.), , . R15 = 10K. R14: R14 = R15 * (VOUT - VRe f . ) 10K * (12V - 2.5V) = = 38K VRe f . 2.5V
() 2005, 2006
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E96 38.2K. , : VOUT = VRe f . * (R14 + R15) 2.5V * (38.2K + 10K ) = = 12.05V R15 10K
1% TL431 (2.44V..2.55V) 11.58V 12.49V (.. 12V±4%). TL431A (c ±1%) TL431B (±0.5%). (U3, R16, R7, R12). SMPS . PC817 Sharp. , .. 50-600%. , . , ( 10mA PC817) , . , , 1mA, 0.6mA 2mA 50% 600%. . , ( 1) . ( 2, 2.5V) R5 R7. R5 R7 5V, . , . (0.5..1)mA UC3844A. 0.5mA R5 R7: R5 = R7 = 10K. 5V. 3V ( Gain). , , . , . , TL431, 1mA ( TL431 , ). 817 0.9V . , R12 : R12 = VVD ( PC817 ) ITL 431( MIN ) = 0.9V = 900 1mA
910 , . 817 . ,
() 2005, 2006
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, , , . . , 817, 5mA (CTR) 50%. CTR 1mA 23% - 0.23mA, . 2mA CTR=38 0.76mA, .. . , 1.5mA. 817 R12. 1.5V ( ), R12 : I R12 = VVD ( PC817 ) max 1.5V = = 1.6 mA R12 910
R13 : I R13 = IR12 + I VD ( PC 817 ) max = 1.6 mA + 1.5mA = 3.1mA R13 TL431 ( , .. 2.5V): R13 < VOUT , min - VTL 431, min 11.58V - 2.5V = = 2.93K IR13 3.1mA
R13=2.7K . (C4, C10, R14). , C10 R14, 4 . C4 , 100pF 470pF - . C4 = 330pF, . , , . . , , , , . , . / , , .
() 2005, 2006
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, ( (1-5)A/µs) . . , .. . . 17 (-) R14 10. , , L1C9. . 17-. , . C10. . 17-. , . C10. . 17-. . R14 . , C10 . R14 . . 17-. , . , , , , . C10 = 10nF, R14 = 47K . . ,
. 17- R14=47K, C10=10nF
. 17- R14=47K, C10=1nF
. 17- R14=47K, C10=470pF
() 2005, 2006
.42 46
. , DC DC , . 11. . 17- , . R14=100K, C10=1nF . . C11 ( «Class Y1»). 4.7nF, . , . 11 4.7nF. Epcos Class Y1 B81123-C1472. DC DC C11 , , -, . C11 , . , . , , «» .
() 2005, 2006
.43 46
. . 18 , .
D4 C8 + C8` + L1 + C2 D2 D1 R4 + T1-2 C3 Q1 C4 R5 C5 U1
1 2 4 8 COMP FB RC REF VCC OUT CS GND 7 6 3 5
+ VIN + 1 R1
R3 R3` R3``
T1-1
T1-3
+ C9 Vout U2-1 R12
R2
R9
D3
R13 R14 C10
R15
R10 U3
R8 U2-2
R7
C6
C7
R11 C11
R16
. 18 T1: EFD25 N87 , 160 nH/² (0.55mm) T1-1: -0.14(AWG35), 70 . T1-2: -0.14(AWG35), 6 . T1-3: 10 -0.40(AWG26) 54
() 2005, 2006
.44 46
.
/
1 C2 C3
TKR330M2WLDF
Jamicon
GRM31BR72J103KW01L Murata TKR101M1EE11 Jamicon
C4, C5, 330pF C7 C6 0.1uF Hitano Vishay
C8, C8` EXR681M50BA C9 C10 293D106X9020B2W 1000pF
C11 B81123-C1472 D1, D3 BAS16 D2 D4 L1 R1, R2 R3, R3`, R3`` R4 R5, R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 T1 U1 U2 U3 S1J 50WQ06FN SDR0805-3R9MS 100K 27K 22 10K 26.1K 120 470 1 910 2.7K 47K 38.2K 10K UC3844A-D8 PC817 TL431AID
Epcos Philips DCcomponents IR ABC
, 33uF, 450V, 18*35.5 , 10nF, 500V, X7R, 1206 , 100uF, 25V, 6.3*11 , 330pF, 50V, NP0, 0805 , 0.1uF, 25V, X7R, 0805 Low ESR, 680uF, 50V, 13*26 , 10uF, 20V, Case "B" , 1000pF, 50V, X7R, 0805 Y1, 4700pF , 75V, 0.2A, SOT-23 , 600V, 1A, 2.5uS, SMB , 60V, 5.5A, DPAK 3.9uH, 4.4A, 7.5*5 100K, 5%, 1206 27K, 5%, 1206 22 Ohm, 5%, 0805 10K, 5%, 0805 26.1K, 1%, 0805 120 Ohm, 5%, 0805 470 Ohm, 5%, 0805 1 Ohm, 1%, 1206 910 Ohm, 5%, 0805 2.7K, 5%, 0805 47K, 5%, 0805 38.2K, 1%, 0805 10K, 1%, 0805 EFD-25 - , SO-8 , DIP-4 2.5V , SO-8
TI Sharp TI
() 2005, 2006
.45 46
3. .
, , , . . , . , , . : 1. . . -, , , .. . -, , . , , 1,5 ! , , . , . . , , , . , ( ). 2. «» . . . , «» . . 18
(1)
(2)
(3)
(4)
. 18 3 , , 9.
() 2005, 2006
.46 46
(8 ) 1 2, . 4 . 3. , . , . 4. . , . (, , TOP-Switch) , , ( ) . , . . . , . . , , . . . , ( 100°/W ø0,5 1,5), . 5. ( ) , . (beads) . SMT .
4.
. , , . , «» , . , .
, . e-mail: [email protected]