【正文】 外 ，它有很高的 功率效率，它是可編程的，還可以配置用于線性的調(diào)節(jié)器 。 also measured. Conclusions are drawn in Section V. 第五部分將引出結(jié)論。 welldesigned driver for LEDs, to avoid unwanted effects due to wiring parasitics. In fact, the behavior of the current in the 文獻(xiàn)翻譯 021309208 吳驍奕 事實(shí)上，燈泡的電流狀態(tài)不隨著線的長度而變化。從圖 5中可以看出， shows the layout and the photo of the whole control unit IC, 布局和圖片的整個控制單元集成在電路中，使得發(fā)光二極管驅(qū)動電子電路增強(qiáng)。 文獻(xiàn)翻譯 021309208 吳驍奕 acts as a linear current regulator. Otherwise, MB is ON and the 反之，如果 MB是打開的而電流環(huán)路控制開關(guān)關(guān)閉，那么 MOS MB將會被強(qiáng)制關(guān)閉。 Slope Control techniques, proposed by the authors in [12] for bulb lamp driving (lowpower dashboard indicator), have been 文獻(xiàn)翻譯 021309208 吳驍奕 improved to maintain the same proper behavior also with arrays of LEDs and high luminosity up to 10W. The design has taken 軟啟動和電流斜率控制技術(shù) ,作者在 [12]中提出的燈泡驅(qū)動 (低功耗儀表板指示器 ),被用來保持適當(dāng)?shù)臓顟B(tài)，同時也排列二極管把光度提高到 10瓦特。 prevent the device to be damaged, by turning to a standby mode the entire driver until a sufficient cooling has occurred. 集成到驅(qū)動為了防止設(shè)備損壞 ,轉(zhuǎn)向一種待機(jī)模式直到整個驅(qū)動都變得足夠冷卻。 rise up the current flowing in the driver, the scheme in Fig. 9 has been modified and five LEDs have been mounted in parallel way, each forward biased with 20 mA. The parison 為了上升啟動電流驅(qū)動 ,該方案在圖 9中已修改并且五個 光二極管已經(jīng)被并聯(lián)在一起 ,每個正向偏壓為 20毫安。 Table II, are used for the following measurements. According to the scheme in Fig. 9, Fig. 10 pares the results achieved with our driver without slope current control [see Fig. 10(a)] 根據(jù)在圖 9圖 10取得的結(jié)果進(jìn)行比較發(fā)現(xiàn)我們的驅(qū)動沒有電流升降控制。 As application example in Fig. 8, the time necessary to reach the steady luminous state of a 10Wload can be greatly reduced by modifying the duty cycle of the control signal (., from 33% to 72% in the example of Fig. 8). Therefore, the Soft Start 作為 應(yīng)用在圖 8的例子 ,必要的時間到達(dá)穩(wěn)定的發(fā)光狀態(tài) 10 w負(fù)載可以大大降低 通過修改工作周期的控制信號 (如 ,從 33%到 72%的例子 ,圖 8)。 allows to implement two functions in the same LED driver IC at minimal hardware overhead: linear regulator mode, useful for 所述方法可以實(shí)現(xiàn)兩個功能相同的 LED驅(qū)動集成電路在最小的硬件開銷 :線性穩(wěn)壓器，用于瞬間的變化和低電流低功率 LED，當(dāng)電源效率不是問題的時候。 文獻(xiàn)翻譯 021309208 吳驍奕 of . The detected driver and load status are used by the internal logic as feedback signals to properly drive the power MOS in Fig. 4, acting as linear regulator or ON–OFF switch, 檢測到的驅(qū)動和負(fù)載狀態(tài)使用內(nèi)部邏輯作為反饋信號正確驅(qū)動動力在圖四中的金屬氧化物半導(dǎo)體 ,是作為線性調(diào)節(jié)器或開關(guān) and implementing advanced Soft Start or Current Slope Control techniques. 和實(shí)施先進(jìn)的軟啟動或電流升降控制技術(shù) The working mode of the LED driver, as linear regulator or ON–OFF switch, is determined by the user by proper configuring the Current level Iref in Fig. 4. The MOSMA mirrors a small 工作模式的 LED驅(qū)動 ,線性調(diào)節(jié)器或通斷 開關(guān) ,是由用戶通過適當(dāng)?shù)呐渲迷趫D 4按圖四的電流是水平。 the ignition key. The basic scheme of the flexible LED driver is shown in Fig. 4, together with circuit details of the operational 這個靈活的發(fā)光二極管驅(qū)動基本方案以及電路詳細(xì)的步驟和跨導(dǎo)放大器塊如圖四所示。 separated by a few meter cables as in automotive connections. In this case, the wiring parasitics can generate ringing and EMI. 出于這個原因，電線的寄生將引起振蕩和電磁干擾。 connections topology, and wiring parasitics. Hereafter, Section 此后，在第二部分，分析了振蕩和電磁干擾在放光二極管驅(qū)動中的影響 。 Current Slope Control techniques are integrated onchip. This letter 這篇文章討論了設(shè)計于集合 于高電壓的互補(bǔ)金屬氧化半導(dǎo)體上的驅(qū)動技術(shù)， discusses the driver design integrating in high voltage CMOS technology, the digital circuitry for programming and electronic 用于編程和電子控制單元連接的數(shù)字電路以及功率元件提高到 10瓦特。 few meters long wires are used, generating dumped oscillations. Such oscillations and the associated overcurrent and overvoltage levels reduce the LED life time and its efficiency 這種振蕩和與之相關(guān)的過電流和過電壓會降低發(fā)光二極管壽命及其效率。 and life time and creating lighting disturbs. This behavior 如果發(fā)光二極管沒有恰當(dāng)?shù)谋或?qū)動的話 這個行為會導(dǎo)致振蕩和高強(qiáng)度的電流尖脈沖。 圖 驅(qū)動集成電路的體系結(jié)構(gòu)和詳細(xì)電路 文獻(xiàn)翻譯 021309208 吳驍奕 The driving of LEDs has required the implementation of specific techniques to limit the undesired effects of wiring parasitics, 發(fā)光二極管的驅(qū)動要求實(shí)施特定的技術(shù)來限制布線寄生現(xiàn)象帶來的不良影響。 phenomena can be detected by paring the measured current and temperature values (through an onchip temperature sensor) with proper thresholds. All reference and threshold levels are 同樣的過電流和超溫現(xiàn)象是可以探測到的測量的電流和溫度的值 (通過一個芯片上的溫度傳感器 )和適當(dāng)?shù)拈撝当容^。 mode Iref is not acting as the sole current limitation level。 generated by an onchip bandgap circuit. The programmability of the Current Slope Control allows the employment of the smart driver with different LEDs configuration, in order to keep down the ringing. 這個可編程的電流升降控制允許使用的智能與不同的發(fā)光二極管驅(qū)動配置 ,為了降低偏振。 was found between increased area of the power MOS and reduction of its onresistance and hence of the power consumption. 關(guān)掉被發(fā)現(xiàn)增加了區(qū)域之間 MOS以及減少電阻，因此增加了功率消耗。 characterization with LEDs of different power levelsand with different types of connections is also discussed. 對 二極管 不同的電壓等級和不同的連接方式的實(shí)驗特征也做了討論。 TABLE I POWER PERFORMANCE OF THE PROPOSED SMART DRIVER 表格 1 智能驅(qū)動的動力性能 TABLE II WIRING PARASITIC ESTIMATION 表格 2 寄生接線的估算 MOS is almost negligible during turn OFF and power down phases, and it is very low even during the turn ON of the load, with a maximum of while driving a