首頁 電源管理 AC/DC 和 DC/DC 控制器 (外部 FET)
首頁
電源管理
AC/DC 和 DC/DC 控制器 (外部 FET)

UC2845

現行

具有 8.4V/7.6V UVLO 50% 工作週期、-40C 至 85C 的單端 500KHz 電流模式 PWM 控制器

立即訂購
產品規格表

UC2845

現行
產品規格表 立即訂購

產品詳細資料

Vin (min) (V) 7.6 Vin (max) (V) 28 Iout (max) (A) 1 Operating temperature range (°C) -40 to 85 Control mode Peak current mode Topology Boost, Buck, Flyback, Forward Rating Catalog Vout (min) (V) 0 Vout (max) (V) 80 Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Iq (typ) (µA) 11000 Duty cycle (max) (%) 50 Number of phases 1
Vin (min) (V) 7.6 Vin (max) (V) 28 Iout (max) (A) 1 Operating temperature range (°C) -40 to 85 Control mode Peak current mode Topology Boost, Buck, Flyback, Forward Rating Catalog Vout (min) (V) 0 Vout (max) (V) 80 Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Iq (typ) (µA) 11000 Duty cycle (max) (%) 50 Number of phases 1
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 14 51.9 mm² 8.65 x 6 SOIC (D) 8 29.4 mm² 4.9 x 6
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1mA)
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load-response characteristics
  • Undervoltage lockout with hysteresis
  • Double-pulse suppression
  • High-current totem-pole output
  • Internally trimmed bandgap reference
  • Up to 500kHz operation
  • Error amplifier with low output resistance
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1mA)
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load-response characteristics
  • Undervoltage lockout with hysteresis
  • Double-pulse suppression
  • High-current totem-pole output
  • Internally trimmed bandgap reference
  • Up to 500kHz operation
  • Error amplifier with low output resistance

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, designed for driving N-channel MOSFETs, is low when the output stage is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, designed for driving N-channel MOSFETs, is low when the output stage is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.
filter 尋找其它 AC/DC 和 DC/DC 控制器 (外部 FET)
下載 觀看有字幕稿的影片 影片

您可能會感興趣的類似產品

open-in-new 比較替代產品
可直接投入的替代產品，相較於所比較的裝置，具備升級功能
TL2845 現行 具有 8.4V/7.6V UVLO 50% 工作週期、-40-85C 的經濟型單端 500KHz 電流模式 PWM 控制器 Supports DC-to-DC fixed-frequency current-mode
UC2845A 現行 具有 8.4V/7.6V UVLO 50% 佔空比、40°C 至 85°C 的 30V、1A、500KHz 電流模式 PWM 控制器 Pin-to-pin equivalent with reduced startup current
引腳對引腳且具備與所比較裝置相同的功能
UCC28C55 現行 工業用 30-V、低功耗電流模式 PWM 控制器、8.4-V/7.6-V UVLO、50% 工作週期 Lower startup and supply current, better reference voltage accuracy and faster overcurrent protection

技術文件

star =TI 所選的此產品重要文件
找不到結果。請清除您的搜尋條件，然後再試一次。
檢視所有 14
類型 標題 日期
* Data sheet UCx84x Current-Mode PWM Controllers datasheet (Rev. H) PDF | HTML 2024年 10月 11日
Application note Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A) PDF | HTML 2021年 6月 11日
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 2019年 3月 12日
Selection guide Power Management Guide 2018 (Rev. R) 2018年 6月 25日
Application note UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers 2002年 2月 7日
Application note DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 1999年 9月 5日
Application note DN-27 UC1842/UC1842A Family - Summary of Functional Differences 1999年 9月 5日
Application note DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 1999年 9月 5日
Application note DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 1999年 9月 5日
Application note DN-65 Considerations in Powering BiCMOS ICs 1999年 9月 5日
Application note U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control 1999年 9月 5日
Application note U-111, Practical Considerations in Current Mode Power Supplies 1999年 9月 5日
Application note Understanding Boost Power Stages In Switchmode Power Supplies 1999年 3月 4日
Application note Understanding Buck Power Stages In Switchmode Power Supplies 1999年 3月 4日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

模擬型號

UCCx8C45 Unencrypted PSpice Transient Model

SLUM533.ZIP (5 KB) - PSpice Model
下載
封裝 針腳 CAD 符號、佔位空間與 3D 模型
PDIP (P) 8 Ultra Librarian
SOIC (D) 14 Ultra Librarian
SOIC (D) 8 Ultra Librarian
適用 TI 的評估品項標準條款與條件。

訂購與品質

內含資訊：
  • RoHS
  • REACH
  • 產品標記
  • 鉛塗層/球物料
  • MSL 等級/回焊峰值
  • MTBF/FIT 估算值
  • 材料內容
  • 認證摘要
  • 進行中持續性的可靠性監測
內含資訊：
  • 晶圓廠位置
  • 組裝地點

支援與培訓

內含 TI 工程師技術支援的 TI E2E™ 論壇

以英文檢視所有論壇主題

內容係由 TI 和社群貢獻者依「現狀」提供，且不構成 TI 規範。檢視使用條款。

若有關於品質、封裝或訂購 TI 產品的問題，請參閱 TI 支援。​​​​​​​​​​​​​​

影片