PDD200A101控制卡件,3BHE019633R0101使用配置說明
一個完美熱管理的設(shè)備具有零熱阻和無限的熱耗散。然而，由于器件是由真實(shí)世界的材料制成的，每種材料都有自己獨(dú)特的熱阻特性，加上沒有任何一個系統(tǒng)可以完美傳遞熱量，因此系統(tǒng)設(shè)計(jì)人員必須從設(shè)計(jì)初期就設(shè)法優(yōu)化每個關(guān)鍵器件的熱性能。固定變量正如許多設(shè)計(jì)人員所知，應(yīng)用的各種參數(shù)通常是固定的，所以需要開發(fā)設(shè)計(jì)以滿足這些要求。在某些情況下，器件的效率、環(huán)境溫度和系統(tǒng)的傳熱機(jī)制取決于最終應(yīng)用。在許多情況下，器件如果要達(dá)到可接受的工作條件和低外殼溫度，唯一的方法就是選擇改善內(nèi)部熱設(shè)計(jì)和選擇內(nèi)部熱阻較低的器件。
PDD200A101控制卡件,3BHE019633R0101使用配置說明優(yōu)化的內(nèi)部熱阻
有兩個關(guān)鍵參數(shù)可供檢視，一個是器件的整體熱阻而另一個是結(jié)溫和環(huán)境溫度之間的熱阻 - Ψjt和θja。Ψjt和θja都是每個器件獨(dú)一無二的熱阻參數(shù)，并且會因封裝的不同而異。Ψjt是熱特性參數(shù)，用來測量熱源和封裝表面之間的多個熱流路徑，而θja代表熱源和環(huán)境溫度之間的直線熱阻。Ψjt與功率相關(guān)，在更高的功耗和外殼溫度下Ψjt的增加最終會降低器件的性能。即使優(yōu)化了Ψjt，高θja電阻值也會導(dǎo)致外殼溫度過高和受限的環(huán)境工作溫度。有許多改善方式能夠降低Ψjt和θja，例如材料優(yōu)化、制造技術(shù)和不同的結(jié)到環(huán)境的熱傳遞方法。其中一個降低熱阻的最新進(jìn)展是 3D Power Packaging?。 使用 3D Power Packaging? (3DPP) 技術(shù)，例如 FCOL、嵌入式 IC、散熱孔等，RECOM 成功地大幅改善了Ψjt和θja值。通過降低 3DPP 產(chǎn)品的這些數(shù)值可以在不限制設(shè)備的環(huán)境溫度的情況下達(dá)到更高的功率表現(xiàn)。高功率密度的解決方案如3DPP等產(chǎn)品，是專為高性能又高效的設(shè)備所設(shè)計(jì)，無需使用主動冷卻或大型被動散熱器。輸入端存在雷擊、浪涌或電壓尖峰沖擊
排查方案：可檢查產(chǎn)品輸入前端保險(xiǎn)絲、整流橋、插件電阻等器件是否損壞，用差分測試上電波形分析。建議在符合技術(shù)手冊EMS條件的環(huán)境內(nèi)使用，若需使用在更惡劣環(huán)境，需在產(chǎn)品前端加入EMC濾波器、防浪涌器件。
輸入電壓遠(yuǎn)超產(chǎn)品最大規(guī)格值
interface. For c5416 and c5420dsp devices, their host interfaces are enhanced host interfaces. The standard HPI interface is an 8-bit bus interface. Two 8-bit bytes are combined to form a 16 bit byte. The enhanced HPI interface is divided into 8-bit and 16 bit. The operation sequence of the 8-bit enhanced host interface is the same as that of the standard HPI interface. The main difference is that the standard type can only access 2 kb of dedicated ram, while the enhanced type can access the entire RAM area of DSP. 16 bit enhanced HPI interface adopts 16 bit bus, and only one host operation can complete the access operation.
(2) HPI hardware connection
The interface circuit between HMS30C7202 and TMS320C5416 is shown in Figure 3. The system addresses all control registers, address registers and data registers of the HPI interface and maps them to the i/o memory space starting from the physical address 0x0c000000 of HMS30C7202.Use the address line ra[3:0] to generate the control signal required for HPI access. A0 and A1 determine the type of access register. A2 decides whether to access the first byte or the second byte: when A2 = 0, it means that the written data is the first byte; When A2 = 1, it means that the written data is the second byte. In hpi-8, all address lines and control lines are sampled on the falling edge of HDS1 and hds2, rather than determined by hr/w.
