SG2844DM集成電路（IC）的ACDC轉(zhuǎn)換器離線開(kāi)關(guān)規(guī)格書(shū)PDF中文資料

SG2844DM屬于集成電路（IC）的ACDC轉(zhuǎn)換器離線開(kāi)關(guān)。由美高森美公司制造生產(chǎn)的SG2844DMAC DC 轉(zhuǎn)換器，離線開(kāi)關(guān)該系列是元器件級(jí)控制產(chǎn)品，用于構(gòu)建將交流市電轉(zhuǎn)換為直流電（通常電壓大幅降低）的設(shè)備。集成和未集成系統(tǒng)主要開(kāi)關(guān)元件的器件均包括在內(nèi)。由于高輸入輸出電壓比，以及此類系統(tǒng)中通常需要隔離，這些器件通常與外部變壓器配合使用。盡管通常使用定制變壓器來(lái)實(shí)現(xiàn)此用途，但也有許多專門(mén)用于此用途的庫(kù)存產(chǎn)品，請(qǐng)參見(jiàn)“開(kāi)關(guān)轉(zhuǎn)換器，SMPS 變壓器”標(biāo)題。

DESCRIPTION

The SG1844/45 family of control ICs provides all the necessary features to implement off-line fixed frequency, current-mode switching power supplies with a minimum number of external components. Current-mode architecture demonstrates improved line regulation, improved load regulation, pulse-bypulse current limiting and inherent protection of the power supply output switch.

KEY FEATURES

■ OPTIMIZED FOR OFF-LINE CONTROL

■ LOW START-UP CURRENT (<1mA)

■ AUTOMATIC FEED FORWARD COMPENSATION

■ TRIMMED OSCILLATOR DISCHARGE CURRENT

■ PULSE-BY-PULSE CURRENT LIMITING

■ ENHANCED LOAD RESPONSE CHARACTERISTICS

■ UNDER-VOLTAGE LOCKOUT WITH 6V HYSTERESIS (SG1844 only)

■ DOUBLE PULSE SUPPRESSION

■ HIGH-CURRENT TOTEM-POLE OUTPUT

■ INTERNALLY TRIMMED BANDGAP REFERENCE

■ 500kHz OPERATION

■ UNDERVOLTAGE LOCKOUT SG1844 - 16 volts SG1845 - 8.4 volts

■ LOW SHOOT-THROUGH CURRENT