I runga i te PCB te whakatakotoranga o te mana, ko tenei pepa e whakaatu ana i te tikanga whakatakotoranga PCB pai rawa, nga tauira me nga tikanga hei whakapai ake i te mahinga o te waahanga hiko huri noa.

I a koe e whakamahere ana i te whakatakotoranga hiko, ko te whakaaro tuatahi ko te waahanga koropiko tinana o nga koropiko e rua e huri ana inaianei. Although these loop regions are largely invisible in the power module, it is important to understand the respective current paths of the two loops because they extend beyond the module. I roto i te koropiko 1 e whakaatuhia ana i te Whakaahua 1, ko te kaitautoko whakauru whakauru (Cin1) e whakawhiti ana i te MOSFET ki te kaiwhakauru o roto me te whakaputa i te kaitohu (CO1) i te wa e haere tonu ana te whakahaere o te MOSFET teitei, ka hoki ano ki te miihini hipa whakauru

Schematic diagram of loop in the power module www.elecfans.com

Whakaahua 1 Whakaaturanga Schematic o te koropiko i te waahanga mana

Loop 2 is formed during the turn-off time of the internal high-end MOSFEts and the turn-on time of the low-end MOSFEts. Ko te pngao kei roto i te kaiwhakauru o roto e rere ana ma te miihini hipa whakaputa me nga MOSFEts mutunga iti i mua i to hokinga mai ki te GND (tirohia te Whakaahua 1). Ko te rohe e kore e rua nga koropiko e hono tetahi ki tetahi (tae atu ki te rohe i waenga o nga koropiko) ko te rohe he DI / DT nui inaianei. Ko te kaiwhakauru hipa whakauru (Cin1) he mahi nui ki te tuku i te auau auau nui ki te kaitahuri me te whakahoki i te auau teitei ki tona ara putake.

Ko te miihini hipa putanga (Co1) kaore i te nui te mana o te AC, engari he taatari auau-nui mo te huri haruru. Mo nga take i runga ake nei, ko te whakauru me nga kaiwhakawhiwhi whakaputa kia tata rawa ki a raatau tohu VIN me VOUT kei runga i te kaupapa. Ka whakaatuhia i te Whakaahua 2, ko te whakauru i hangaia e enei hononga hono ka taea te whakaiti ma te hanga waea hiko i waenga i nga kaitahuri hiko me a raatau tohu VIN me VOUT kia rite ki te poto me te whanui ka taea.

Whakaatu 2 koropiko KAUPAPA MAHI

Ko te whakaiti i te whakauru i roto i te whakatakotoranga PCB e rua nga painga nui. Tuatahi, whakapai ake i te mahinga waahanga ma te whakatairanga i te whakawhiti kaha i waenga i te Cin1 me te CO1. Ma tenei e mohio ai he pai te hipa a te kōwae, he whakaiti i te teitei o te ngaohiko whakauru na te mea nui o te DI / DT. Ka whakaitihia te haruru o te taputapu me te ahotea hiko kia pai ai te whakahaere. Tuarua, whakaitihia te EMI.

Ko nga Kaitautoko e hono ana me te kore o te werawera e whakaatu ana i nga ahuatanga koretake ki nga auau teitei, na reira ka whakaitihia te rauropi e whakahaerehia ana. Nga miihini uku (X7R me te X5R) me etahi atu momo momo ESR iti ranei e taunakitia ana. Ka taea noa nga kaitohu whakauru whakauru ki te takaro mena ka whakanohohia etahi atu capacitor ki te taha o nga pito GND me te VIN. The Power module of the SIMPLE SWITCHER is uniquely designed to have low radiation and conducted EMI. However, follow the PCB layout guidelines described in this article to achieve higher performance.

Ko te whakamahere ara iahiko i tenei wa kaore e aro ki taua mahi, engari he mahi nui tena ki te whakapai ake i te hoahoa hiko. In addition, ground wires to Cin1 and CO1 should be shortened and widened as much as possible, and bare pads should be directly connected, which is especially important for input capacitor (Cin1) ground connections with large AC currents.

Ko nga titi o te whenua (tae atu ki nga papa koreu), nga urunga whakauru me nga kaiwhakaputa whakaputa, nga kaitohu tiimata ngohengohe, me nga parenga urupare o te waahanga me hono katoa ki te papa koropiko kei runga i te PCB. Ka taea te whakamahi i tenei papa koropiko hei huarahi whakahoki ma te iti rawa o te waa whakauru kaore ano hoki kia rite ki te taputapu wera wera e korerohia ana i raro ake nei.

ATUAHI. 3 Hoahoa Whakaaturanga o te waahanga me te PCB hei aukati i te waiariki

Ko te parenga urupare me whakanoho kia tata ki te tohu FB (urupare) o te waahanga. To minimize the potential noise extraction value at this high impedance node, it is critical to keep the line between the FB pin and the feedback resistor’s middle tap as short as possible. Available compensation components or feedforward capacitors should be placed as close to the upper feedback resistor as possible. For an example, see the PCB layout diagram in the relevant module data table.

For AN example layout of LMZ14203, see the application guide document AN-2024 provided at www.naTIonal.com.

Nga Whakaaro Hoahoa Whakawhana wera

Ko te whakatakotoranga kiato o nga waahanga, i te wa e whakarato ana i nga hua hiko, he raru kino ki te hoahoa wera wera, ka whakakorehia te mana taurite mai i nga Wahanga iti. To address this problem, a single large bare pad is designed on the back of the Power module package of the SIMPLE SWITCHER and is electrically grounded. Ko te papa he awhina ki te whakarato i te aukati wera tino iti mai i nga MOSFEts o roto, e whakaputa ana i te nuinga o te wera, ki te PCB.

Ko te aukati waiariki (θJC) mai i te hononga semiconductor ki te kohinga o waho o enei taputapu ko te 1.9 ℃ / W. Ahakoa te whakatutukitanga o te uara θJC-a-umanga he pai, ko te uara θJC iti kaore e whai kiko ina he nui rawa te pehanga o te waiariki (θCA) o te kete o waho ki te rangi! Mena kaore i te whakawhiwhia te ara mokowhiti iti-koretake ki te hau e karapoti ana, ka kohi te wera ki runga i te papa kore ka taea te whakakore. Na he aha te whakatau θCA? Ko te aukume waiariki mai i te papa whanau ki te hau ka tino whakahaerehia e te hoahoa PCB me te wera wera e pa ana.

Na mo te titiro tere me pehea te hoahoa i tetahi PCB ngawari kaore he peera, te whakaahua 3 e whakaatu ana i te waahanga me te PCB hei aukati i te waiariki. Na te mea ko te haurangi i waenga i te hononga me te tihi o te kete o waho he mea nui ki te hikoi hiko mai i te hononga ki te papa whanau, ka taea e taatau te aro ki te ara wera wera θJA i te wa o te whakatau tuatahi mo te aukati waiariki mai i te hononga ki te te hau huri noa (θJT).

Ko te mahi tuatahi mo te hoahoa whakamahana wera ko te whakatau i te kaha o te mana ka turakina. Ko te mana e pau ana i te konae (PD) ka taea te tatau ma te whakamahi i te kauwhata pai (η) i whakaputaina i te teepu raraunga.

Ka whakamahia e maatau nga awangawanga awangawanga o te paemahana teitei i te hoahoanga, TAmbient, me te paemahana honohono i whakaritea, TJuncTIon (125 ° C), hei whakatau i te awangawanga a-waiariki e hiahiatia ana mo nga taapiri whakauru kei runga i te PCB.

I te mutunga, i whakamahia e maatau tetahi waahanga maatau mo te whakawhiti wera wera tino nui i runga i te mata o te PCB (me nga kirikiri parahi 1-hekere kua pakaru me te maha o nga rua wera i te papa o runga me raro) hei whakatau i te waahanga pereti e hiahiatia ana mo te wera wera.

Ko te tata o te rohe PCB e hiahiatia ana kaore e aro ki te mahi a nga kohao wera wera e whakawhiti ana te wera mai i te papa whakarewa o runga (kua hono te putea ki te PCB) ki te papa whakarewa o raro. Ko te paparanga o raro hei papa papa tuarua e taea ai e te whakawhitinga te whakawhiti wera mai i te pereti. Me whakamahi kia 8 ki te 10 nga poka whakamatao kia tika ai te tatauranga a te poari. Ko te aukati waiariki o te wera wera e tata ana ki te wharite e whai ake nei.

Ko tenei whakatata e pa ana ki te kohao puta noa i te 12 mils diameter me te 0.5 oz parahi i te taha. I te mea e tika ana kia hangaia nga kohao totohu wera i te waahi katoa i raro ake o te papa noho, ana ko enei kohao wera ka whakatuu i te rahinga o te 1 ki te 1.5mm.

mutunga

Ko te miihini Hiko KAIWHU ATU e whakarato ana i tetahi rereke ki nga hoahoa mana hiko matatini me nga whakatakotoranga PCB angamaheni e hono ana ki nga kaitahuri DC / DC. Ahakoa kua whakakorehia nga wero whakatakotoranga, me mahi tonu etahi mahi hangarau hei whakapai ake i te mahinga o te waahanga me te pai o te paahitanga me te hoahoa wera wera.