東沃電子（DOWOSEMI）代理的TMP1750芯片是一款具有模擬和 PWM 調(diào)光控制功能的三通道線性LED驅(qū)動(dòng)器。該器件的全面診斷和內(nèi)置保護(hù)功能使其成為可變強(qiáng)度 LED 照明（可達(dá)到中等功率范圍）應(yīng)用的理想之選。查看TMP1750芯片產(chǎn)品手冊(cè)，可知：The design of this device suits it well for driving LEDs configured as a single string or multiple strings within its power capability. A single device can drive up to three strings with one to three LEDs in each string at a total current of up to 150 mA per channel. Outputs can be paralleled to provide higher current drive capability to 450 mA. In multiple-string applications, the device offers the advantage of having common-cathode connection of the LED strings. So, the application needs only a single return wire instead of one return wire per LED string that a system with low-side current sense would need. A single-LED-short comparator allows detection of single LED failing with a short circuit. Fault output can support bus connection topology between multiple devices. The included temperature monitor reduces the LED drive current if the device junction temperature exceeds a thermal threshold. One can program the temperature threshold through an external resistor. One can disable the thermal current-monitor feature by connecting the TEMP pin to ground. Output of the junction temperature as an analog voltage is available as a factory program option.

TMP1750三通道線性LED驅(qū)動(dòng)器特點(diǎn)

? 符合汽車類應(yīng)用的標(biāo)準(zhǔn)

? 具有符合 AEC-Q100標(biāo)準(zhǔn)的下列結(jié)果

– 器件溫度 1 級(jí)：–40°C 至 125°C 的環(huán)境運(yùn)行溫度范圍

– 器件 HBM ESD 分類等級(jí) H2

– 件 CDM ESD 分類等級(jí) C3B

? 3通道LED驅(qū)動(dòng)器（具有模擬和PWM調(diào)光功能）

? 寬輸入電壓范圍：5V - 28V

? 由基準(zhǔn)電阻器設(shè)定的可調(diào)恒定輸出電流

– 最大電流：每通道 150mA

– 最大電流：并聯(lián)運(yùn)行模式下為 450mA

? 使用多個(gè)IC或者單個(gè)IC的多個(gè)通道的并聯(lián)輸出，以實(shí)現(xiàn)更高電流

? 低壓降電壓

– 最大壓降：電流為60mA時(shí)每通道400mV

– 最大壓降：電流為150mA時(shí)每通道 0.9V

? 每個(gè)通道獨(dú)立進(jìn)行 PWM 調(diào)光

? 具有抗毛刺脈沖計(jì)時(shí)器的開路和短路LED檢測(cè)

? 每條通道的LED燈串電壓反饋，用于單個(gè)LED短路檢測(cè)

? 針對(duì)單個(gè)LED短路故障的獨(dú)立故障引腳

? 用于報(bào)告開路、短路和熱關(guān)斷故障的故障引腳，可通過(guò)一條總線并行連接最多 15 個(gè)器件

? 器件可適應(yīng)慢輸入電壓 dV/dt（0.5V/分），而不會(huì)出現(xiàn)任何問(wèn)題

? 運(yùn)行結(jié)溫范圍：-40°C 至 150°C

? 封裝：16引腳耐熱增強(qiáng)型封裝 (HTSSOP)

TMP1750三通道線性LED驅(qū)動(dòng)器引腳配置說(shuō)明

TMP1750三通道線性LED驅(qū)動(dòng)器應(yīng)用電路

汽車LED照明應(yīng)用，比如：日間行車燈、駐車燈、霧燈、尾燈 、停車燈、室內(nèi)照明燈。

細(xì)心的電子工程師對(duì)比參數(shù)后會(huì)發(fā)現(xiàn)，東沃電子（DOWOSEMI）代理的三通道線性LED驅(qū)動(dòng)器TMP1750可替代替換品牌TI （德州儀器）TPS92630-Q1 (pin-to-pin HTSSOP-16)、TPS92610-Q1（當(dāng)TMP1750三通道并聯(lián)輸出450mA應(yīng)用時(shí)可以代替）、TPS92611-Q1（當(dāng)TMP1750三通道并聯(lián)輸出450mA應(yīng)用時(shí)可以代替）和Elmos品牌E522.80/81。