HOME在庫検索>在庫情報

部品型式

ML4821CS

製品説明
仕様・特性

May 1997 Micro Linear ML4821* Power Factor Controller GENERAL DESCRIPTION FEATURES The ML4821 provides complete control for a “boost” type power factor correction system using the average current sensing method. Special care has been taken in the design of the ML4821 to increase system noise immunity. The circuit includes a precision reference, gain modulator, average current error amplifier, output error amplifier, over-voltage protection comparator, shutdown logic, as well as a high current output. In addition, start-up is simplified by an under-voltage lockout circuit. s s s s s s In a typical application, the ML4821 controls the AC input current by adjusting the pulse width of the output MOSFET. This modulates the line current so that its shape conforms to the shape of the input voltage. The reference for the current regulator is a product of the sinusoidal line voltage times the output of the error amplifier which is regulating the output DC voltage. Average line voltage compensation is provided in the gain modulator to ensure constant loop gain over a wide input voltage range. This compensation includes a special “brown-out” control which reduces output power below 90V RMS input. s s s Average current sensing for lowest possible harmonic distortion Average line compensation with brown-out control Precision buffered 5V reference 1A peak current totem-pole output drive Overvoltage comparator eliminates output “runaway” due to load removal Wide common mode range in current sense comparators for better noise immunity Large oscillator amplitude for better noise immunity Output driver internally limited to 17V “Sleep mode” shutdown input * Some Packages Are Obsolete BLOCK DIAGRAM 11 1 OVP + VREF ILIM – + SLEEP – 0.7V – UNDER VOLTAGE LOCKOUT + 2 3 IA OUT IA– + IA+ S VLIMIT R + 6 7 OUT VRMS GAIN MODULATOR PGND RT OSC SYNC CT EA OUT 15 14 13 12 10 17 VREF EA– – VREF 9 18 17V OUT ISINE 16 Q 4 8 GND VCC – – 5 VREF + SOFT START Micro Linear 1

ブランド

TI

会社名

Texas Instruments Incorporated

本社国名

U.S.A

事業概要

世界25ヶ国以上に製造・販売拠点を有する国際的な半導体企業であり、デジタル情報家電、ワイヤレス、ブロードバンド市場に欠かせないデジタル信号処理を行うDSPと、それに関連するアナログIC、マイクロコントローラを主力製品としている。

供給状況

 
Not pic File
お探し部品ML4821CSは、当社担当が市場調査を行いメールにて結果を御連絡致します。

「見積依頼」をクリックして どうぞお問合せ下さい。

送料

お買い上げ小計が1万円以上の場合は送料はサービスさせて頂きます。
1万円未満の場合、また時間指定便はお客様負担となります。
(送料は地域により異なります。)


お取引内容はこちら

0.0556228161