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AC/DC 切換穩壓器
AC/DC 控制器

UC3845A

現行

具有 8.4V/7.6V UVLO 50% 工作週期、0°C 至 70°C 的 30V、1A、500KHz 電流模式 PWM 控制器

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產品規格表

UC3845A

現行
產品規格表 立即訂購

產品詳細資料

Topology Boost, Buck, Buck boost, 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 Sector Test & measurement
Topology Boost, Buck, Buck boost, 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 Sector Test & measurement
SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm) SOIC (D) 14 51.9 mm² (8.65 mm × 6 mm) PDIP (P) 8 92.5083 mm² (9.81 mm × 9.43 mm)
  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5mA)
  • Trimmed Oscillator Discharge Current
  • 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
  • Create a Custom Design Using the UCx84xA With the WEBENCH Power Designer
  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5mA)
  • Trimmed Oscillator Discharge Current
  • 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
  • Create a Custom Design Using the UCx84xA With the WEBENCH Power Designer

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5mA, oscillator discharge is trimmed to 8.3mA, and during UVLO, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V.

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5mA, oscillator discharge is trimmed to 8.3mA, and during UVLO, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V.
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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 UCx84xA Current-Mode PWM Controller 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-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 DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection 1999/9/5
應用說明 U-111, Practical Considerations in Current Mode Power Supplies 1999/9/5
應用說明 DN-30 Programmable Electronic Circuit Breaker 1999/9/5

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SOIC (D) 8 Ultra Librarian
SOIC (D) 14 Ultra Librarian
PDIP (P) 8 Ultra Librarian
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