| 在線座談主題：飛思卡爾電源管理解決方案 | ||
| [ 問(wèn)題 1 ] | 熱插拔子卡的設(shè)計(jì)中，由于底板系統(tǒng)在子卡插拔時(shí)部分總線仍然處于工作狀態(tài)，對(duì)于這樣的熱插拔設(shè)計(jì)需要注意一些什么？ | |
| [ 答案 1 ] | 子板總線的工作電壓應(yīng)該是子板提供的, 當(dāng)您插拔子板時(shí), 工作電壓由MC34652/3提供, 瞬間的涌入電流由它們控制, 不會(huì)損壞負(fù)載子板。 | |
| [ 問(wèn)題 2 ] | 飛思卡爾的電平轉(zhuǎn)換器對(duì)電源的加電順序有何影響？ 應(yīng)如何考慮？ | |
| [ 答案 2 ] | This would not impact your power sequencing unless it yanks down your power lines of either your IO or core voltages. Even if this does happen, the power sequencing if active, will ensure the sequencing is proper. If this does not answer your question, pls enquire with Freescale regional FAE. | |
| [ 問(wèn)題 3 ] | 飛思卡爾的電源管理相對(duì)于其它公司的同類(lèi)產(chǎn)品有何不同的特點(diǎn)和優(yōu)勢(shì)？ | |
| [ 答案 3 ] | Freescale solution can provide reduced system level (BOM) cost and can save PCB space saving. Also, some cost competitiveness. Freescale's power saving mode is ideal for handheld powered. This product can improve overall regulation. | |
| [ 問(wèn)題 4 ] | 飛思卡爾的MCU對(duì)上電和掉電順序很敏感嗎？錯(cuò)誤的順序會(huì)導(dǎo)致什么后果？ | |
| [ 答案 4 ] | It depends on which MCU or processor, you need to check with the datasheets. To give you an example, for our PowerQUICC1 2 processors (Power PC) they need power sequencing. For the PowerQUICC3, this does not.The wrong sequencing could mean that the core voltage is undefined when it is receiving valid digital inputs to the processor and this could be a problem. | |
| [ 問(wèn)題 5 ] | LDO方式和開(kāi)關(guān)電源方式在芯片內(nèi)部的電壓變換和功能實(shí)現(xiàn)上是如何劃分的？ | |
| [ 答案 5 ] | 對(duì)于使用飛思卡爾的芯片, 你可以不用過(guò)分關(guān)注于是SW提供還是LDO提供的供電 只需要注意您的負(fù)載電流和不同的輸出電壓。 SW和LDO的工作原理不同, 很難在這里講清楚。請(qǐng)參考飛思卡爾本次座談里的內(nèi)容或其它著作。在線座談: http://www.freescale.com.cn/webcast/Analog/PowerManagementSolution.asp | |
| [ 問(wèn)題 6 ] | MC34652最大能承載多大的瞬間電流？ | |
| [ 答案 6 ] | MC34652 has a short circuit current limit funtion. Its maximum current is 5A. If the current is greater than 5A (>5A), the power MOSFET is discharged very fast (<10uS) and MC34652 is in overcurrent mode for 3.0mS. Please refer to data sheet page 11~12 overcurrent mode and short circuit mode. | |
| [ 問(wèn)題 7 ] | MC34703能承受多大的瞬間電流？ | |
| [ 答案 7 ] | 19A | |
| [ 問(wèn)題 8 ] | 按照負(fù)載點(diǎn)拓?fù)鋱D方式, 在拓?fù)潼c(diǎn), 飛思卡爾有哪些外圍組件最少的電源管理芯片, 比如提供3.3V,1.8V？ | |
| [ 答案 8 ] | 這在線座談飛思卡爾介紹的芯片, 和飛思卡爾的電源管理器件都對(duì)外圍組件需要較少。 請(qǐng)參考飛思卡爾的選購(gòu)指南獲得其它的產(chǎn)品信息。 | |
| [ 問(wèn)題 9 ] | 不知道有沒(méi)有升壓型、降壓型一體的開(kāi)關(guān)電源芯片，具體型號(hào)是什么？ | |
| [ 答案 9 ] | Freescale provides both buck and boost regulators but are on more sophisticated devices. For example, Freescale's portable 18730 device. For simplier ones, Freescale has not released them yet, stay tunned for this. | |
| [ 問(wèn)題 10 ] | 電源的噪聲有多種定義如uVrms, V/rtHz, 還有dBc/Hz, 它們有什么不同？ 那種最能反映電源的噪音性能？ | |
| [ 答案 10 ] | This is not concerned with the power supply but is relating to it, though not entirely as it depends on noises from your other components. In general, noise is a measure of energy over a frequency range. So you would see this with per Hertz. If you have uV/Hz then it means the voltages of noise for 1 hz. You then multiply this with the bandwidth of interests. dBc is the power level reference to the carrier signal. This is with RF, not the power supply. Vrms is Voltage root mean square value. It is the equivalent dc level of an ac voltage. You need to read up from reference material on this. | |
| [ 問(wèn)題 11 ] | 負(fù)載點(diǎn)是怎么劃分的？ | |
| [ 答案 11 ] | First, you need to know your power budget requirement and then the load requirements of each point in your system that you want to power. This would depends on the ripple voltage, line, load requlations, power output etc. Once you have the characteristics of the load then you pick your power supply that can cater for this requirement. If you go to Freescale power management solution webcast, an example is given of a 3G system. Also a design example is given for a specific load requirements. Webcast replay: http://www.freescale.com.cn/webcast/Analog/PowerManagementSolution.asp | |
| [ 問(wèn)題 12 ] | 開(kāi)關(guān)電源和LDO有什么區(qū)別？ | |
| [ 答案 12 ] | 簡(jiǎn)單的說(shuō)，開(kāi)關(guān)電源是通過(guò)PWM控制的，可以通過(guò)不同的頻率和占空比來(lái)獲得電壓。它不是連續(xù)的。LDO是連續(xù)輸出的，一般只能提供比輸入電壓低的輸出電壓。在飛思卡爾這次的座談中，有對(duì)開(kāi)關(guān)電源和LDO的討論。 | |
| [ 問(wèn)題 13 ] | 開(kāi)關(guān)電源或線性電源的輸出電壓和輸入電壓相差較大時(shí), 是否效率就降低？ | |
| [ 答案 13 ] | For LDO regulator, the answer is Yes. But for switching regulator, the efficiency is not dependent on voltage difference. | |
| [ 問(wèn)題 14 ] | 開(kāi)關(guān)電源模塊的地和線性穩(wěn)壓模塊的地怎么處理為好？ | |
| [ 答案 14 ] | 一般需要在輸出端加濾波電容�？梢詤⒖硷w思卡爾的芯片數(shù)據(jù)手冊(cè)，內(nèi)部有詳細(xì)的介紹。 | |
| [ 問(wèn)題 15 ] | 可否采用瞬態(tài)電壓抑制器來(lái)應(yīng)付負(fù)載突降？ | |
| [ 答案 15 ] | It depends on which device you are talking about from the webcast. Freescale dc-dc convertor is designed to handle transient surges and we do have special devices incorporated to handle high surges like the hotswap controllers. But if you were to add in an external suppressor, you need to be concerned with the response time and whether this will deprive the power to your load. Pls consult with Freescale local FAE if you need help. | |
| [ 問(wèn)題 16 ] | 我們現(xiàn)在要實(shí)現(xiàn)一個(gè)系統(tǒng), 由于歷史的原因, 需要3V, 1.8V, 5V, 3.3V, 2.5V的電源支持, 請(qǐng)問(wèn)飛思卡爾有沒(méi)有一個(gè)芯片解決這個(gè)問(wèn)題的方案？ 如此復(fù)雜的系統(tǒng), 在布線方面有什么技巧嗎？ | |
| [ 答案 16 ] | 您可以根據(jù)您的不同工作電壓，在不同的位置，可以考慮使用飛思卡爾的電源芯片。飛思卡爾不僅僅提供本次座談中提及的MC34701/2/3，飛思卡爾還有其它的LDO和開(kāi)關(guān)型電源芯片。請(qǐng)?jiān)L問(wèn)飛思卡爾的網(wǎng)頁(yè) http://www.freescale.com.cn/Products/analog.asp 或和當(dāng)?shù)氐娘w思卡爾，代理商聯(lián)系獲得幫助。飛思卡爾代理商聯(lián)系信息 (按地區(qū)檢索或按名錄查詢(xún)): http://www.freescale.com.cn/others/wheretobuy/ | |
| [ 問(wèn)題 17 ] | 我想了解一下飛思卡爾的ldo的最低壓差是在多少？ | |
| [ 答案 17 ] | 50mv. | |
| [ 問(wèn)題 18 ] | 飛思卡爾有沒(méi)有控制下電時(shí)序的方案？ | |
| [ 答案 18 ] | Freescale QUICCSupply can provide both power up and down sequencing, whether standard or inverted. You just need to program or select this sequence using 2 enable pins provided by the device. For the actual specification pls go to Freescale website and download the datasheet for this. | |
| [ 問(wèn)題 19 ] | a. POL電源主要應(yīng)用于何種場(chǎng)合？ b. 使用POL電源應(yīng)注意那些問(wèn)題？ | |
| [ 答案 19 ] | Just to clarify, POL is Point of load and is a method of power management. It is not a power Supply. POL can be applied to any systems whether it is complex or simple. In fact the more complicated your system power is, the better this scheme would benefit you. You will have better EMC, better regulation, transient response and less IR losses. When using POL, you need to pay attention to the total loading that each PoL will have on your main power, or your Brick supply. | |
| [ 問(wèn)題 20 ] | 我在做硬件設(shè)計(jì)的時(shí)候，經(jīng)常遇到關(guān)于電源的問(wèn)題是：功率和紋波系數(shù)的問(wèn)題？請(qǐng)問(wèn)，現(xiàn)在技術(shù)在這兩方面有什么新的突破沒(méi)有？ 另外, 如果工作溫度從-50度至150時(shí)，要求電源仍有優(yōu)良的穩(wěn)定性和精度，現(xiàn)在國(guó)際比較領(lǐng)先的在這方面能做到什么程度？ | |
| [ 答案 20 ] | Most of our devices are for temp range -40 to 85degrees. If you want outside this range then you need to consult with Freescale sales office to help. It seems you are searching for automotive grade supplies. Freescale group is with Industrial and consumer grade. For your 1st question, we have very high power efficiency using Pusle skip mode in our 18730 device for a wide load range. But for Freescale other devices that do not require this, Freescale has not incorporated this. For ripple factor on the input or output, you need to consider both the converter and the board components like the Output cap's ESR etc. | |
| [ 問(wèn)題 21 ] | 請(qǐng)問(wèn)ldo 降壓差調(diào)節(jié)器的主要應(yīng)用環(huán)境？ 它的間斷性供電會(huì)不會(huì)給系統(tǒng)造成影響，比如說(shuō)噪聲什么的？ | |
| [ 答案 21 ] | LDO provides stable and low-noise output voltage source, but poor efficiency. So LDO is suitable for no power-saving concern application. | |
| [ 問(wèn)題 22 ] | 請(qǐng)問(wèn)為何有些處理器沒(méi)有上電順序的問(wèn)題呢？ 上點(diǎn)順序是否可以在處理器設(shè)計(jì)上予以解決呢？ | |
| [ 答案 22 ] | There are many reasons. Some are not concerned with the undefined core voltages because they have some initialization state within the processor, while others may have their own power sequencing built in. To solve this, you can use Freescale chip by direct plug in, and no need to concern with this aspect. Or you need to stick in 2 diodes with appropriate power rating to solve this. | |
| [ 問(wèn)題 23 ] | 如何解決上電順序和EMC考慮，另外在電源功耗上是怎樣解決的？ | |
| [ 答案 23 ] | For Power Sequencing, there are several ways: First, you can use our chip and it will do the job for you but you must make sure that this power sequencing is compliant to your processor. Freescale is for the PowerQUICC processor and should be good for many others. The other way is to use external components like 2 diodes. For EMC, this is more complicated, you need to have good isolation and guarding between your switching signals and how power signals away from your more sensitive nodes (inputs and outputs). Power consumption would depend on the type or power supply topology that you are using. A good measure is in the power efficiency and not the power consumption. This is a very broad topic and is not the focus of this topic. | |
| [ 問(wèn)題 24 ] | 什么是動(dòng)態(tài)功率管理功能？ 飛思卡爾的電源效率能達(dá)到多高？ 影響電源效率的因素有多少？ | |
| [ 答案 24 ] | 由于不同的產(chǎn)品達(dá)到不同的電源效率 。 | |
| [ 問(wèn)題 25 ] | 使用LDO的時(shí)候如果輸入和輸出壓差較大芯片發(fā)熱量會(huì)不會(huì)很大？ | |
| [ 答案 25 ] | No, the package doesn't need heat sink for the issue. | |
| [ 問(wèn)題 26 ] | 我們的系統(tǒng)需要5V，3.3V,1.8V,1.5V供電，其中5V的負(fù)載很輕，電流只有幾個(gè)mA，而3.3V 的負(fù)載電流有幾百mA。 輸入電壓為28V， 請(qǐng)問(wèn)是用28V/5V， 再5V/3.3V等分級(jí)轉(zhuǎn)換， 還是分負(fù)載點(diǎn)直接轉(zhuǎn)換？ 飛思卡爾有這樣的產(chǎn)品解決方案么？ | |
| [ 答案 26 ] | 飛思卡爾的器件可以提供1路5V/3.3V輸出和1路1.8V/1.5/V輸出。如果使用5V/3.3V分極轉(zhuǎn)換可能需要的芯片會(huì)增多，功耗增大，使用負(fù)載點(diǎn)的方案可能更好些。 您的5V負(fù)載很輕，可以考慮使用其它方式來(lái)實(shí)現(xiàn)。 可以考慮飛思卡爾的MC34710芯片。 | |
| [ 問(wèn)題 27 ] | 我們現(xiàn)在的項(xiàng)目是無(wú)線傳感器網(wǎng)絡(luò)，它對(duì)電源的要求非常嚴(yán)格！因?yàn)槭且淮涡缘模詫?duì)于電源的使用要有很多的節(jié)能方案。不知道飛思卡爾有沒(méi)有這方面應(yīng)用的解決？ | |
| [ 答案 27 ] | 本次飛思卡爾座談只介紹了一款電池供電產(chǎn)品，MPC18730。您可以先根據(jù)您的具體要求比照MPC18730，看是否滿(mǎn)足需要。 還有您可以訪問(wèn)飛思卡爾的網(wǎng)站獲得更多的無(wú)線產(chǎn)品和解決方案。http://www.freescale.com.cn/Products/analog.asp | |
| [ 問(wèn)題 28 ] | 我是做STB產(chǎn)品方案設(shè)計(jì)的，需要把5V的電壓降壓為3.3V/600ma、1.8V/600ma，應(yīng)該采用那一款芯片合適，大概成本如何？目前我使用的是1085兩塊。 | |
| [ 答案 28 ] | MC34710可以提供兩路輸出，但是1.8V的輸出僅提供500mA的電流。您看是否可以滿(mǎn)足需要。如果使用MC34701的話(huà)可以完全滿(mǎn)足您的需要。 | |
| [ 問(wèn)題 29 ] | 我需要一種6V～60V寬輸入范圍, 輸出5V～1.2V的電路, 能否推薦一款飛思卡爾的產(chǎn)品。 | |
| [ 答案 29 ] | Recommend MC34129 (MC33129) PWM controller and apply Flyback topology. The solution can meet your requirement. | |
| [ 問(wèn)題 30 ] | 希望給我們一個(gè)12v300mA低成本小體積高可靠開(kāi)關(guān)電源方案？ | |
| [ 答案 30 ] | 您是指12V輸出嗎。飛思卡爾目前提供的輸出電壓都低于12V。如果您需要12V輸入，其它電壓輸出的話(huà)，請(qǐng)和飛思卡爾當(dāng)?shù)氐墓こ處熉?lián)系。 | |
| [ 問(wèn)題 31 ] | 用硬件信號(hào)能控制電源以實(shí)現(xiàn)對(duì)負(fù)載的電源關(guān)斷和自動(dòng)重啟么？ | |
| [ 答案 31 ] | Yes. | |
| [ 問(wèn)題 32 ] | 在負(fù)載出現(xiàn)短路或斷路情況，電源管理芯片有自我保護(hù)功能嗎？過(guò)去采用linear的芯片，曾出現(xiàn)燒DC/DC芯片的情況。 | |
| [ 答案 32 ] | Yes, Freescale power management solution provides overcurrent protection. | |
| [ 問(wèn)題 33 ] | 在應(yīng)用于DVB/數(shù)字電視方面，有什么特別推薦或是優(yōu)勢(shì)產(chǎn)品？ | |
| [ 答案 33 ] | 請(qǐng)比較飛思卡爾芯片提供的輸出方式，輸出電壓，輸出電流，輸出的路數(shù)，等等，根據(jù)您的產(chǎn)品具體需要才能夠選擇合適的型號(hào)。 | |
| [ 問(wèn)題 34 ] | 在熱插拔設(shè)計(jì)中，如果母板和子板各自是一個(gè)工作系統(tǒng)，兩者的電源是由同一電源模塊輸出的，子板的插拔造成了電源負(fù)載的劇烈變化（子卡的功耗較大), 對(duì)母板來(lái)說(shuō)，會(huì)造成什么樣的影響，如何減小這種影響？ | |
| [ 答案 34 ] | This is why you need to have a hotswap controller to limit the in-rush current on your motherboard. The exact reasoning applies of that from the backplane. Since the daughter card draws most of the current, removing it will create spikes on your motherboard. You need to have protection circuitry to prevent damages to your onboard components. Freescale hotswap will provide this function for you. | |
| [ 問(wèn)題 35 ] | MC34701對(duì)比LT1941EFE在靜態(tài)功耗上有什么優(yōu)勢(shì)？LT1941EFE在靜態(tài)功耗也有幾個(gè)毫安，MC34701會(huì)不會(huì)更好？ | |
| [ 答案 35 ] | MC34701的靜態(tài)指標(biāo)可以參看datasheet，34701可以提供一路開(kāi)關(guān)電源，1.5A的驅(qū)動(dòng)電流。和一路LDO。同時(shí)針對(duì)處理器的特點(diǎn)，提供安全的上電和下電控制，確保處理器正常工作。 | |
| [ 問(wèn)題 36 ] | 剛才我又看到PPT中有關(guān)給PORTABLE供電的芯片背面有不規(guī)則的焊盤(pán)那是做什么用的呢？散熱嗎? | |
| [ 答案 36 ] | Those pads that are in the middle are for Freescale internal testing purposes and are to be left alone and disconnected. | |
| [ 問(wèn)題 37 ] | 飛思卡爾提供免費(fèi)樣片嗎？ | |
| [ 答案 37 ] | 請(qǐng)跟飛思卡爾代理商聯(lián)系 (按地區(qū)檢索或按名錄查詢(xún)): http://www.freescale.com.cn/others/wheretobuy/或到飛思卡爾免費(fèi)樣品網(wǎng)站進(jìn)行申請(qǐng): http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=010984007869597059286929489 | |
| [ 問(wèn)題 38 ] | 降壓調(diào)節(jié)器的主要應(yīng)用場(chǎng)合是什么？ | |
| [ 答案 38 ] | 當(dāng)要求的供電電壓與供電電源電壓不同時(shí)，都可能需要使用電壓調(diào)節(jié)器。 | |
| [ 問(wèn)題 39 ] | 開(kāi)關(guān)電源或線性電源的輸出電壓和輸入電壓相差較大時(shí), 是否效率就降低？ | |
| [ 答案 39 ] | Ldo efficiency will be affected (drop) if the drop out voltage is increased (Vin-Vout). This is directly proportional to the efficiency. Switcher will be affected by the Inductor on-off cycle time. This duty cycle will affect the efficiency as it determines the ontime of the charging of the external components and hence the switching loss. For instance, if Vout is very small, the on time for charging to the inductor is less but the discharging path is longer. One would need to conduct analysis along this path and understand the current losses with respect to each components during the on and off cycles. Nevertheless, the bigger the difference between Vin and Vout, the more efficient it is to use the switcher as oppose to the LDO. | |
| [ 問(wèn)題 40 ] | 開(kāi)關(guān)是穩(wěn)壓塊效率受他的周?chē)娐酚绊懘髥幔? | |
| [ 答案 40 ] | This depends on what the other components are. If the components belong to the switcher this will affect the efficiency. For instance, the DCR of the inductor, or the free-wheeling diode will both affect the switcher's efficiency. | |
| [ 問(wèn)題 41 ] | 哪一款電源芯片適合MCF5275，這些芯片是否已經(jīng)量產(chǎn)？ | |
| [ 答案 41 ] | 飛思卡爾介紹的MC34701/2/3都可以給它供電，關(guān)鍵看您的產(chǎn)品對(duì)電源的需求。請(qǐng)參看他們的datasheets。關(guān)于芯片的供貨情況，請(qǐng)和飛思卡爾的銷(xiāo)售或代理商聯(lián)系 (按地區(qū)檢索或按名錄查詢(xún)): http://www.freescale.com.cn/others/wheretobuy/ | |
| [ 問(wèn)題 42 ] | 你們這幾種電源芯片的功耗參數(shù)是多大？ | |
| [ 答案 42 ] | Power consumption would depend on which device you are talking about and what loading you are applying to the circuit as well as what the input signal is. You need to refer to the datasheets and look this up for the max and minimium. To give you an example, if you are applying a low Vin verses that of a high Vin to the buck switcher then the device itself will consume more power for the low Vin because it needs to turn on the booster circuitry inside the chip. This is assuming that the loading is the same for both cases. | |
| [ 問(wèn)題 43 ] | 請(qǐng)透漏MC34703的供貨價(jià)格范圍。 | |
| [ 答案 43 ] | 請(qǐng)跟飛思卡爾代理商聯(lián)系 (按地區(qū)檢索或按名錄查詢(xún)): http://www.freescale.com.cn/others/wheretobuy/或參閱飛思卡爾MC34703網(wǎng)頁(yè): http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MC34703&nodeId=01435974403526 | |
| [ 問(wèn)題 44 ] | 請(qǐng)問(wèn)飛思卡爾電源管理主要用于哪些產(chǎn)品上面？ | |
| [ 答案 44 ] | 飛思卡爾電源管理產(chǎn)品適用于汽車(chē)、電信、工業(yè)和消費(fèi)類(lèi)產(chǎn)品。 | |
| [ 問(wèn)題 45 ] | 請(qǐng)問(wèn)飛思卡爾能提供整套方案嗎，包括周?chē)骷? | |
| [ 答案 45 ] | 飛思卡爾只提供 IC。 | |
| [ 問(wèn)題 46 ] | 請(qǐng)問(wèn)什么是開(kāi)關(guān)電源，它與線形電源有什么區(qū)別？ | |
| [ 答案 46 ] | A switching power supply is one that chops up the output current to the load and maintains the output voltage by this chopped up load. This uses an external inductor to provide the current on one part of a duty cycle and allowing the switcher FET to be turned off during the latter part to minimize power loss. This is why a switcher has higher efficiency. An LDO, lowdrop out regulator is a liner regulator that directly drops the voltage across the FET and in turn providing the required output voltage. The greater you drop the voltage, the higher the loss. There are trade offs with these 2 types of supplies in terms of regulations, ripples, losses and efficiencies etc. | |
| [ 問(wèn)題 47 ] | 我的電路設(shè)計(jì)需要5v/1A的電流，有現(xiàn)成的集成元器件嗎（輸入為6V)？ | |
| [ 答案 47 ] | 飛思卡爾的MC34701可以提供1.5A的電流，同時(shí)還具有上電和下電控制功能和其它保護(hù)功能。 | |
| [ 問(wèn)題 48 ] | 用于便攜式產(chǎn)品，有何推薦電源方案？ | |
| [ 答案 48 ] | 在本次座談中飛思卡爾介紹了一款飛思卡爾的電源管理產(chǎn)品，適合單電池供電。請(qǐng)您參看本次座談的內(nèi)容。 | |
| [ 問(wèn)題 49 ] | 有可調(diào)1~10A的電流反饋（負(fù)載電阻在5~10間隨機(jī)變化）低成本開(kāi)關(guān)電源方案嗎？年用量3~5萬(wàn)個(gè)/年。 | |
| [ 答案 49 ] | MC34703可以提供10A電流的輸出。 | |
當(dāng)前的電子資訊：飛思卡爾電源管理解決方案在線座談和常見(jiàn)問(wèn)題解答
上一篇電子資訊：[上一篇]：高級(jí)電源管理常見(jiàn)問(wèn)題解答
下一篇電子資訊：[下一篇]：非隔離直流-直流轉(zhuǎn)換器常見(jiàn)問(wèn)題F
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