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AC/DC 切換穩壓器
AC/DC 控制器

UC1845-SP

現行

QML-V, 30V input, 1A single-output 500kHz PWM controller, 50% duty cycle

立即訂購
產品規格表

UC1845-SP

現行
產品規格表 立即訂購

產品詳細資料

Topology Boost, Flyback, Forward Control mode Current Features Error amplifier, Multi-topology Duty cycle (max) (%) 50
Topology Boost, Flyback, Forward Control mode Current Features Error amplifier, Multi-topology Duty cycle (max) (%) 50
LCCC (FK) 20 79.0321 mm² (— mm × — mm) CDIP (JG) 8 64.032 mm² (— mm × — 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
* SMD UC1845-SP SMD 5962-86704 2016/7/8
選擇指南 TI Space Products (Rev. L) 2026/3/27
應用說明 Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form (Rev. A) PDF | HTML 2025/11/5
Application brief DLA Approved Optimizations for QML Products (Rev. C) PDF | HTML 2025/6/17
應用說明 Heavy Ion Orbital Environment Single-Event Effects Estimations (Rev. B) PDF | HTML 2025/6/10
更多文件說明 TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing (Rev. B) 2025/2/20
應用說明 QML flow, its importance, and obtaining lot information (Rev. C) 2023/8/30
應用說明 Single-Event Effects Confidence Interval Calculations (Rev. A) PDF | HTML 2022/10/19
Application brief Controlling Input Power for Present and Next-Generation Power Controllers PDF | HTML 2020/12/14
應用說明 DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer 2020/8/21
電子書 Radiation Handbook for Electronics (Rev. A) 2019/5/21
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-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 U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control 1999/9/5
應用說明 Modeling, Analysis and Compensation of the Current-Mode Converter 1999/9/5
應用說明 DN-30 Programmable Electronic Circuit Breaker 1999/9/5
應用說明 DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers 1999/9/5
應用說明 DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 1999/9/5

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LCCC (FK) 20 Ultra Librarian
CDIP (JG) 8 Ultra Librarian
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