ホーム パワー・マネージメント AC/DC と DC/DC の各コントローラ (外部 FET)

バック・パルス幅モジュレータ型 降圧型電圧レギュレータ

UC2578 は新規設計での使用を推奨しません
これまでにご購入されたお客様をサポートする目的でこの製品を引き続き生産しています。新規設計では代替品をご検討ください。
open-in-new 代替品と比較
比較対象デバイスと同等の機能で、ピン配置が異なる製品
LM5145 アクティブ 75V、入力電圧範囲とデューティ・サイクル範囲の広い同期整流・降圧コントローラ Voltage mode controller with adjustable switching frequency
比較対象デバイスと類似の機能
TPSM365R3 アクティブ 3V ~ 36V 入力、1V ~ 13V 出力、0.3A、同期整流降圧コンバータ・パワー・モジュール Save board space, simplify design and speed time to market with an integrated-inductor power module.

製品詳細

Vin (min) (V) 11 Vin (max) (V) 72 Iout (max) (A) 0.2 Operating temperature range (°C) -40 to 85 Control mode Voltage mode Rating Catalog Vout (min) (V) 5 Vout (max) (V) 62 Features Enable Iq (typ) (µA) 10000 Duty cycle (max) (%) 100
Vin (min) (V) 11 Vin (max) (V) 72 Iout (max) (A) 0.2 Operating temperature range (°C) -40 to 85 Control mode Voltage mode Rating Catalog Vout (min) (V) 5 Vout (max) (V) 62 Features Enable Iq (typ) (µA) 10000 Duty cycle (max) (%) 100
SOIC (D) 16 59.4 mm² 9.9 x 6
  • Provides Simple Single Inductor Buck PWM Step-Down Voltage Regulation
  • Drives External High Side NMOS Switch
  • 14V to 72V Input Voltage Operating Range
  • Contains 100kHz Internal Oscillator, 2V Reference and UVLO
  • Soft Start on Power Up
  • Overcurrent Shutdown Followed by Soft Start
  • Provides Simple Single Inductor Buck PWM Step-Down Voltage Regulation
  • Drives External High Side NMOS Switch
  • 14V to 72V Input Voltage Operating Range
  • Contains 100kHz Internal Oscillator, 2V Reference and UVLO
  • Soft Start on Power Up
  • Overcurrent Shutdown Followed by Soft Start

The UC3578 is a PWM controller with an integrated high side floating gate driver. It is used in buck step down converters and regulates a positive output voltage. Intended to be used in a distributed power system, the IC allows operation from 14V to 72V input voltage which range includes the prevalent telecomm bus voltages. The output duty cycle of the UC3578 can vary between 0% and 90% for operation over the wide input voltage and load conditions.

The UC3578 simplifies the design of the single switch PWM buck converter by incorporating a floating high side driver for an external N-channel MOSFET switch. It also features a 100kHz fixed frequency oscillator, an internal 2V precision reference, an error amplifier configured for voltage mode operation, and a PWM comparator with latching logic. Complementing the traditional voltage mode control block, the UC3578 incorporates an overcurrent shutdown circuit with full cycle soft re-start to limit the input current to a user defined maximum value during overload operation. Additional functions include an under voltage lockout circuit to insure that sufficient input supply voltage is present before any switching activity can occur.

The UC2578 and the UC3578 are both available in surface mount and thru-hole power packages.

The UC3578 is a PWM controller with an integrated high side floating gate driver. It is used in buck step down converters and regulates a positive output voltage. Intended to be used in a distributed power system, the IC allows operation from 14V to 72V input voltage which range includes the prevalent telecomm bus voltages. The output duty cycle of the UC3578 can vary between 0% and 90% for operation over the wide input voltage and load conditions.

The UC3578 simplifies the design of the single switch PWM buck converter by incorporating a floating high side driver for an external N-channel MOSFET switch. It also features a 100kHz fixed frequency oscillator, an internal 2V precision reference, an error amplifier configured for voltage mode operation, and a PWM comparator with latching logic. Complementing the traditional voltage mode control block, the UC3578 incorporates an overcurrent shutdown circuit with full cycle soft re-start to limit the input current to a user defined maximum value during overload operation. Additional functions include an under voltage lockout circuit to insure that sufficient input supply voltage is present before any switching activity can occur.

The UC2578 and the UC3578 are both available in surface mount and thru-hole power packages.

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種類 タイトル 最新の英語版をダウンロード 日付
* データシート Buck Pulse Width Modulator Stepdown Voltage Regulator データシート 1999年 9月 5日

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記載されている情報:
  • RoHS
  • REACH
  • デバイスのマーキング
  • リード端子の仕上げ / ボールの原材料
  • MSL 定格 / ピーク リフロー
  • MTBF/FIT 推定値
  • 使用原材料
  • 認定試験結果
  • 継続的な信頼性モニタ試験結果
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  • 組み立てを実施した拠点