Lub luag haujlwm ntawm LDOs hauv Kev Hloov Cov Khoom Siv Hluav Taws Xob Lub Luag Haujlwm ntawm LDOs hauv Hloov Cov Khoom Siv Hluav Taws Xob
1. Simplifying switching power supply design
Hloov cov khoom siv hluav taws xob ntau qhov kev tawm tswv yim feem ntau pom tau los ntawm kev ntxiv lub tshuab hluav taws xob hloov hluav taws xob ntau zaus, uas ua rau lub zog hloov hluav taws xob nce tus neeg tsim khoom ua haujlwm thaum lub sijhawm tsim. Daim ntawv thov ntawm LDO raws li qhov tso zis davhlau ya nyob twg ntawm kev hloov pauv hluav taws xob tuaj yeem ua kom yooj yim rau kev tsim cov khoom siv hluav taws xob hloov thiab ua kom lub voj voog loj hlob sai.
2. Txhim kho cov kev cai thauj khoom ntawm kev hloov fais fab mov
LDO yog ib qho tshwj xeeb nti kom ruaj khov rau lub zog hluav taws xob, thiab muaj ntau lub tuam txhab tsim LDOs nrog cov kev cai thauj khoom me me. Daim ntawv thov ntawm LDO tuaj yeem txo qis kev tswj hwm tus nqi ntawm kev hloov hluav taws xob.
3. Ua tau zoo lim tawm qhov cuam tshuam ntawm electromagnetic cuam tshuam ntawm kev hloov hluav taws xob, txo cov zis tawm ripple
Hloov fais fab mov yog qhov tsis zoo ntawm kev tsim EMI muaj zog. EMI cov teeb liab muaj ob qho tib si ntau zaus, tab sis kuj muaj qee qhov amplitude, los ntawm kev ua thiab hluav taws xob yuav ua rau cov khoom siv hluav taws xob sib txuas, cov khoom siv sib txuas lus thiab cov khoom siv hluav taws xob ua rau muaj kev cuam tshuam. Yog tias tsis ua haujlwm zoo, lub zog hloov hluav taws xob nws tus kheej yuav dhau los ua qhov cuam tshuam. LDO muaj qhov sib piv ntawm cov khoom siv hluav taws xob siab, thiab LDO yog lub suab qis, yog li daim ntawv thov ntawm LDO tuaj yeem lim cov hloov hluav taws xob hloov EMI, txo cov zis tawm.
4. Muab kev tiv thaiv overcurrent rau kev hloov cov khoom siv hluav taws xob
Txawm hais tias ntau PWM tswj chips lawv tus kheej muaj kev tiv thaiv overcurrent, tab sis kev tiv thaiv overcurrent muaj nuj nqi ntawm LDO tuaj yeem txhim kho qhov kev nyab xeeb ntawm kev hloov hluav taws xob.
Kev Ntsuam Xyuas
Ob qhov kev sim hauv qab no yog ua los xyuas qhov ua tau ntawm cov txheej txheem:
1. Kev ntsuas qhov ntsuas qhov sib npaug
Kev sim ntsuas hluav taws xob tau pom hauv daim duab 3. Tam sim no los ntawm 0mA mus rau 400mA yog rub tawm los ntawm cov khoom siv hluav taws xob, thiab cov zis hluav taws xob ntawm lub zog hloov hluav taws xob tau sau tseg ntawm txhua qhov chaw thauj khoom. Cov ntaub ntawv xeem tau ua tiav los tsim cov duab qhia hauv daim duab 4. Daim duab qhia pom tau tias qhov zoo tshaj plaws load tuning piv ntawm LDO tau hloov pauv tag nrho rau lub zog hloov pauv. Hauv lwm lo lus, LDO tau txhim kho qhov kev tswj hwm tus nqi ntawm lub zog hloov pauv.
2. Kev ntsuas cov zis Ripple
Txuas lub oscilloscope rau LDO cov tswv yim thiab cov zis ntawm lub zog hloov hluav taws xob raws li, cov waveforms qhia hauv daim duab 5 tuaj yeem muab tau. Qhov twg Ch1 yog qhov tso zis waveform ntawm qhov nkag ntawm LDO, thiab Ch2 yog cov zis tawm ntawm qhov tawm ntawm LDO, qhov kawg tso zis waveform ntawm lub zog hloov pauv.
Raws li tuaj yeem pom los ntawm daim duab saum toj no, LDO zoo lim tawm cov khoom siv hluav taws xob hloov hluav taws xob EMI cov cim, tsis zoo li lub tsev EMI cov ntxaij lim dej, daim ntawv thov ntawm LDO yog yooj yim dua thiab txhim khu kev qha.
