1、M U OQO! VDROP=2VBE+VSAT(NPN REG)MEP! MEP! VDROP=VBE+VSAT U VOUT=VREF(1 + R1/R2)10123901n 1. NPN n 3. LDO 10123902n 2. PNP LDO 10123903TT F9e 1148Chester Simpson2000 N 5M U AN-11482002 National SemiconductorCorporation AN101239 #“W F N X z: LM340 LM317 = T rYFA2u QC NPNs 6 on 1( NPN LDO LDO quasi-LD
2、OA q NPN QC PNP6 NPNs 6 Q r U| | X2 1.5V 2.5V dropout voltageLm “ “: _ 7CY=X u 5V 3.3V _ LDO n 3 LDO NPNs LDO X8 PNP6 NPN6zO NPN LDO X N 0 , | C! : G R $ _ ! )*101239091012391110123910n 9. :n /Nnn 10. -:n /Nnn 11.|Np,nAN- 4z1 “n“ ! 20dB/F : GrO* “n“ _: G # WVN N rN2NNW 0 90C: G : GNNL2_ , - NN_F T j
3、C : G 90CNNL2 s 180C4I r- -%m (N - . ):n xM rD+20dB/F N n 10 .: G -4 rNs_ W G -4NN 0 90C - r 45C NNL2_ N - _ “R “:n N sU NR 1kHz* -Q rN 0dB/F 10kHz* rN 20dB/F 100kHz* :_LC rLN 40dB/F n 11 W B:n 0dB r_1MHz 0dB rI:% _| N NnWV - tR Z 4n 2t - :NN: j r f NN WZW0U : NN arctan(f/fp) j r f -NN WZW0U : -NN a
4、rctan(f/fz)O _ t6 BU :2 0dBINNO _1MHz . , C - ( - ) r 0CF T E ,NN: _J 2 LDO _$jA G-z : - Wi Z , Z _p,nt d C -p,nn 11t:n N M“ A:n 80dBC 4 100Hz*O r*:n xM rN 20dB/F R $ _ ! )*NPN LDO 10123912n 12.NPN p,n10123913n 13. LDO:np,nAN-5zO . C - E 2:NN 180C 90CL NNN 90CLC F D 0dB -NNU W : 4 84CNN 1MHzI G 90CN
5、N NN_ 174C: _N_ 6CO _ W NPN 6 on 1 _ # U # _C2, _|FG j# _:n xM r D * NPN & QC 0F_ # C _:n A G C on 12 NPN P1WVC“100Hz* 100Hz* Q:n 20dB/F r im , 3MHz* P2 P2*:n xM r: G 20dB/F P2 r2 & NPN r6 $N2 _zOI:O r 7 P2D _:n 10dB*zO:n 0dB r*1MHzNN Em 2 : 0dB r*NC P14 90CN N_ P2: G 18CN N 1MHz*: _ 0dB*N N 108CN 7
6、2CW _ej_ , f5 ( W B _ , Q _s 180CNN2 ! E 90CNN , 8 P2 r* 0dB 1MHz*NN E m LDO PNP6 F U N # U|F G F G | GZ *D O % PLWV r0U:f(PL) 1/(2! Rload ! Cout)OU W LDO ZW fA G UMDJ ? 6 M“C 5V/50mA LDO0 I r :Lw AI PL r0U :PL 1/(2! Rload ! Cout)1/(2! 100 ! 10-5) 160Hz M“ 1kHz*A G C (P1) PNP r6 _j 500kHz*DC r PPWR
7、M“ A:n 80dB, Lw| AIF RL 100| Cout 10uFQ I r WNp,n n 13 W B _ PL P1tZ490CNN 0dB*O 40kHzNNs 180C iNNF _BA GC -C - W4 90CNNLDO Q ESR LDOESR KESR10123914n 14. ESRs _n10123915n 15. ESR - LDO10123916n 16.LDO ESRT xMAN- 6zO , LDO2 _A G - -C_ZW| s2 FZ f ESR Z LDO2 q | ESR C,T | LDO05C# | ESR AGmT xMn 16U5 I
8、 J2 eJ uTj Q . 5 1 ESRNZ#Q C 5 1 M“ 10uF| ESR: G 20 Q - r 800Hzn 17 - rQ _| : G:n 0dB rW 100kHz 5 2MHz| : Gj# PPWRDZ| 2n15tn 17p,n xMND UI - P1 PLC xMZm: _ _t 90C NN 4 76C NN PPWR Zs2 F ESR_ C (, W WVF 2 s _n 14| ESR _:n4C - WiW NN -* r Fzero ESR | N2Fzero 1/(2! Cout ! ESR) B C 1n 13 M“| Cout 10uF|
9、ESR 16 -4 16kHz*n 15p,nBV A GO - Q#e _| : G :n 0dB rW 30kHzN 100kHz 100kHz* -: : G 81CNN: _ i PL P10NN Ppwr 500kHz* 100kHz* : G 11CNN G - NN E 0dB*:NN 110C: _ 70CN#ee e 5b ESR| W4 - LDO#eESR ( ) ESR| 5 LDOM ESR!LDO10123917n 17. ESR _p,n10123918n 18. ESR _AN-7 6 14CN (#e W ), lBV ESR 10I EO f WV W 9
10、| _ LDO 5IB 1 ( LDO _| ESRW W0 LDO5| Z _L5# CuQ)M 8 “ : LDO LP2985lC AVX 4.7uF , W 25FI ESR 1.3*Tn 16 7Ce2 AVX ESR 40F 125FT Nm 2:1 i IESR:bU LDO| BjZw)M = 1uFESR 20m ,Q# LP2985 LDO 4 UQ)M 22 F: G ESRw )M , _ Z5U: _UT 7 0 Q Nx jQ LDOn 3 J o Z LDO NPN , z LDO NPN6 # G: Q| B NF G 8 NPN _F G PNP A LDO|
11、F GaQ NPNs 6NPN + ( 2 PNP6 # | LDO|F G2 ): _ Q LDO r r2 NPN zO LDO:2Cu (| ) s , r r22 LDO r zO LDO2m 8 PESR2 q: O Z LDO LM1085 W|s 3A A 10uF| LDO0B5 ESRT xMn LDO ESR2 q 5 ESR| Cz:4 C 1 M 10uF| ESR 50m6 - rN 320kHzn 18 : #e_ P1 PL 0dB* 4 180CNN U2#e6- 0dB .NN 8 -320kHz*Y #e| F U TT F9 | LDO LP2985 LP
12、29892 qMa)M C# ESR| ESR W2 q ESR, LDO( )Q FETsn610123919n 19.Ps6 LDO AN-1148M U eNational SemiconductorAmericas CustomerSupport CenterEmail: Tel: 1-800-272-9959National SemiconductorEurope Customer Support CenterFax: +49 (0) 180-530 85 86Email: Deutsch Tel: +49 (0) 69 9508 6208English Tel: +44 (0) 8
13、70 24 0 2171Franais Tel: +33 (0) 1 41 91 8790National SemiconductorAsia Pacific CustomerSupport CenterEmail: National SemiconductorJapan Customer Support CenterFax: 81-3-5639-7507Email: Tel: 81-3-5639- _Q TT F9 4 P V _ W TT F9I _ 7ZY L ia 4 | TT F9: o q - TT F9 U4 “ #e2 p rQ,O 1. 4 “ /#e avZW TnN9 4
14、 “ #e b 4 HwQ QI ?s02. 2 p r_4 “ #e ?s04 “ /#e?s Z4 “ /#e s rTT F90 Q io 6 T CSP-9-111C2 $N2 T CSP-9-111S2I |d CSP-9-111S2L “ “ $ RoHS 8 5 10m 8#m ESR LDO n 18V Q LP2985 O ESR U ,Q -: 6 .| ESR -#T_ ESR L G - LDO ESR TC 100m -5bQ 8 )M LP2985 ESRT 3M , s 500MzO WQ)M2 ESR L z i Jn 15 5O LDO -Y% # IC zO 4 ESR -B*A rQ| 6 4AwNN8 LDO WQ P-FET Ps6U6n 19 Q P-FET LDO*j , PNPLDOn 2 r62 A Aj| SzOW| Aj LDO |0U : PWR Base Drive! Vin ! Ibase2 PNP6 A A# PNP6:nCu PNP LDO C 15 20 AN2O A4|_ _| Ps6 P-FETF A m & 6 P-FET LDO 7C_s6FETZFQ # 8s r6 ZF2 826ZF Wm0|w A
