LM201

LM201

-----

-----

開關(guān)式穩(wěn)壓電源接控制方式分為調(diào)寬式和調(diào)頻式兩種，在實(shí)際的應(yīng)用中，調(diào)寬式使用得較多，在目前開發(fā)和使用的開關(guān)電源集成電路中，絕大多數(shù)也為脈寬調(diào)制型。因此下面就主要介紹調(diào)寬式開關(guān)穩(wěn)壓電源。

　　 調(diào)寬式開關(guān)穩(wěn)壓電源的基本原理可參見下圖。

　　 對(duì)于單極性矩形脈沖來說，其直流平均電壓Uo取決于矩形脈沖的寬度，脈沖越寬，其直流平均電壓值就越高。直流平均電壓Ｕ?？捎晒接?jì)算，

　　 即Uo=Um×T1/T

　　 式中Um為矩形脈沖zui大電壓值；T為矩形脈沖周期；T1為矩形脈沖寬度。

　　從上式可以看出，當(dāng)Um 與T 不變時(shí)，直流平均電壓Uo 將與脈沖寬度T1 成正比。這樣，只要我們?cè)O(shè)法使脈沖寬度隨穩(wěn)壓電源輸出電壓的增高而變窄，就可以達(dá)到穩(wěn)定電壓的目的。

TRIAD CONTROLS MG-16-0F-AU 120 VAC 60 HERTZ LIGHT CURTAIN TRANSMITTER
 
DELPHI MASS AIR FLOW SENSOR AF10003
 
IFM EFECTOR PROXIMITY SWITCH IEB3001-APOG
 
BIMBA MAGNETIC REED SWITCH MRS-.027
 
BALLUFF INDUCTIVE SENSOR BES 517-561-H-RK NIB
 
SICK * 30 FGS SAFETY LIGHT CURTAIN * FGSE 1200-221
 
DELPHI OXYGEN SENSOR ES10412 NIB
 
KISTLER-MORSE MICROCELL SENSOR WEIGHING SYSTEM KIT 35-2019-01/-02
 
DELPHI THROTTLE POSITION SENSOR SS10487 NIB
 
DELPHI TS10034 TEMPERATURE SENSOR, NIB
 
NAMCO EE530-58420 PROXIMITY SWITCH
 
WESTINGHOUSE CURRENT SENSOR ITE-K1600
 
TESTRON BODY TEST CONNECTION T-99963
 
FOXBORO PLATINUM RESISTANCE TEMPERATURE DETECTORS NIB PR-14WBS-012
 
SICK * C4000 STANDARD LIGHT CURTAIN * C40E-0603CA010
 
PEPPERL+FUCHS CUSHIONED SENSOR MOUNT, CM-18, NNB
 
BANNER MULTI-BEAM SCANNER BLOCK 17628
 
PEPPERL + FUCHS 20-250VAC PROXIMITY SENSOR NJ15+W

IFM EFECTOR IE5129 IE-3001-BPOG POSITION INDUCTIVE PROXIMITY SENSOR, NIB
 
NAMCO 20-230VAC/DC, 0.5A CYLINDICATOR SENSOR EE230-27820
 
OMRON THROUGH BEAM LASER SENSOR HEAD ZX-LT010
 
MAGNETIC PULSE SENSOR ASSEMBLY W/20" RIGHT ANGLE CABLE AA01.4601, NNB
 
EFECTOR 200 OJ5019 PHOTOELECTRIC SENSOR, NIB
 
IFM EFECTOR IG0335 PROXIMITY SWITCH, NIB
 
NAMCO * PROXIMITY SWITCH NIB * EE280-98200
 
BALLUFF PROXIMITY SWITCH BES 516-118-B0-C NNB
 
IFM SENSOR OG5041 OGE-FPKG
 
TRI-TRONICS FIBER OPTIC LIGHT GUIDE SENSOR BF-D-16-219 NIB
 
BANNER SM912F VALU-BEAM PHOTOELECTRIC SCANNER, NIB
 
BALLUFF LIMIT SWITCH BNS 519-100-D-11
 
STI * MINISAFE RECEIVER * MS4320BR
 
REXROTH 553 -001-1200 FLOW SENSOR, NNB
 
ACCU-SORT SYSTEMS BARCODE SCANNER MODEL 55
 
BEI MOTION SYSTEMS ENCODER 924-01002-2521
 
DELPHI TS10120 TEMPERATURE SENSOR, NIB
 
RIS STRAIN GAUGE TRANSMITTER SC-1390-C
 
DELPHI ENGINE CRANKSHAFT POSITION SENSOR ES10174 NIB
 
PEPPERL + FUCHS PROXIMITY INDUCTIVE SENSOR NIB 904159 101780
 
CUTLER HAMMER EATON PROXIMITY SENSOR E57LAL30T111
 
SIERRA MONITOR CORPORATION COMBUSTIBLE GAS SENSOR MODULE 5100-02-IT
 
IFM EFECTOR SI1000+E40107 FLOW MONITOR SENSOR SI8503 NIB
 
SICK LIGHT CURTAIN RECEIVER C40E-0603CC010
 
DELPHI SS10250 SPEED SENSOR, NIB
 
DELPHI SS10415 SPEED SENSOR, NIB
 
DELPHI SS10250 SPEED SENSOR, NIB
 
DELPHI SS10332 SPEED SENSOR, NIB
 
SONY MAGNESWITCH SENSOR PG-104 NIB
 
ALLEN BRADLEY GLASS FIBER OPTIC CABLE, 43GR-MVS00SL SER. A