內(nèi)置轉(zhuǎn)換器和過(guò)流保護(hù)的微特步進(jìn)電機(jī)驅(qū)動(dòng)芯片

HR4985是一種便于使用的內(nèi)部集成了譯碼器的微特步進(jìn)電機(jī)驅(qū)動(dòng)器。其設(shè)計(jì)為能使雙極步進(jìn)電機(jī)以全、半、1/4和1/8步進(jìn)模式工作。步進(jìn)模式由邏輯輸入MSx選擇。輸出驅(qū)動(dòng)能力達(dá)到35V和±1A。HR4985包含一個(gè)工作在慢衰或混合衰減模式的固定關(guān)閉時(shí)間的電流調(diào)節(jié)器。\n\n譯碼器是HR4985易于實(shí)施的關(guān)鍵。通過(guò)STEP簡(jiǎn)單的輸入一個(gè)脈沖就可以使電機(jī)完成一次步進(jìn)，省去了相序表，高頻控制線及復(fù)雜的編程接口。這使其更適于在沒(méi)有復(fù)雜的微處理器或微處理器負(fù)擔(dān)過(guò)重的場(chǎng)合。\n\n在步進(jìn)操作期間，HR4985的內(nèi)部電路可以自動(dòng)的控制其PWM操作工作在快、慢及混合衰減模式。在混合衰減模式下，器件初始經(jīng)過(guò)一段時(shí)間 ? 低導(dǎo)通電阻RDS(ON)\r\n\r\n? 自動(dòng)檢測(cè)并選擇電流衰減模式\r\n\r\n? 支持滿衰減和混合衰減模式\r\n\r\n? 降低功耗的同步整流功能\r\n\r\n? 內(nèi)部欠壓鎖定\r\n\r\n? 過(guò)流保護(hù)\r\n\r\n? 兼容3.3V和5V的邏輯電平\r\n\r\n? 過(guò)熱關(guān)斷電流\r\n\r\n? 對(duì)地短路保護(hù)\r\n\r\n? 負(fù)載短路保護(hù)\r\n\r\n? 低電流睡眠模式，＜10uA;

Heroic

禾潤(rùn)

Micro-stepping motor driver chip with built-in converter and overcurrent protection

文件：130.97 Kbytes 頁(yè)數(shù)：3 Pages

HEROIC

禾潤(rùn)

STEMP, END LAUNCH, TNC, F

文件：126.56 Kbytes 頁(yè)數(shù)：1 Pages

WINCHESTER

溫徹斯特

CCM PFC controller with high voltage startupv

Features Peak current mode CCM-operated 800 V high voltage startup with integrated input voltage sensing Active input filter capacitor discharge Proprietary multiplier “emulator” with minimum THD of line current in all operating conditions (CCM and DCM) Extremely few external components Pro

文件：1.2952 Mbytes 頁(yè)數(shù)：27 Pages

STMICROELECTRONICS

意法半導(dǎo)體

CCM PFC controller with high voltage startupv

Features Peak current mode CCM-operated 800 V high voltage startup with integrated input voltage sensing Active input filter capacitor discharge Proprietary multiplier “emulator” with minimum THD of line current in all operating conditions (CCM and DCM) Extremely few external components Pro

文件：1.2952 Mbytes 頁(yè)數(shù)：27 Pages

STMICROELECTRONICS

意法半導(dǎo)體