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AC/DC 切換穩壓器
AC/DC 控制器

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

Topology Boost, Buck, Flyback, Forward Control mode Peak current mode Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
Topology Boost, Buck, Flyback, Forward Control mode Peak current mode Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
PDIP (P) 8 92.5083 mm² (9.81 mm × 9.43 mm) SOIC (D) 14 51.9 mm² (8.65 mm × 6 mm) SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm)
  • 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.
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技術文件

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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 UCx84x Current-Mode PWM Controllers datasheet (Rev. H) PDF | HTML 2024/10/11
應用說明 Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A) PDF | HTML 2021/6/11
應用說明 Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 2019/3/12
選擇指南 Power Management Guide 2018 (Rev. R) 2018/6/25
應用說明 UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers 2002/2/7
應用說明 DN-65 Considerations in Powering BiCMOS ICs 1999/9/5
應用說明 DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 1999/9/5
應用說明 DN-27 UC1842/UC1842A Family - Summary of Functional Differences 1999/9/5
應用說明 DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 1999/9/5
應用說明 DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 1999/9/5
應用說明 U-111, Practical Considerations in Current Mode Power Supplies 1999/9/5
應用說明 U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control 1999/9/5
應用說明 Understanding Buck Power Stages In Switchmode Power Supplies 1999/3/4
應用說明 Understanding Boost Power Stages In Switchmode Power Supplies 1999/3/4

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