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AC/DC 和 DC/DC 控制器 (外部 FET)

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

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TL2845B 現行 具有 8.4V/7.6V UVLO、50% 工作週期、-40C 至 85C 的 30-V、0.2A 高性能 500KHz 電流模式 PWM Pin-to-pin equivalent with reduced start-up current

TL2845

現行
產品規格表 立即訂購

產品詳細資料

Vin (max) (V) 30 Operating temperature range (°C) -40 to 85 Control mode Current Topology Boost, Flyback Rating Catalog Features Adjustable switching frequency, Current limiting, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
Vin (max) (V) 30 Operating temperature range (°C) -40 to 85 Control mode Current Topology Boost, Flyback Rating Catalog Features Adjustable switching frequency, Current limiting, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 8 29.4 mm² 4.9 x 6 SOIC (D) 14 51.9 mm² 8.65 x 6
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1mA)
  • Automatic feed-forward 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
  • 500kHz operation
  • Error amplifier with low output resistance
  • Designed to be interchangeable with UC2842 and UC3842 series
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1mA)
  • Automatic feed-forward 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
  • 500kHz operation
  • Error amplifier with low output resistance
  • Designed to be interchangeable with UC2842 and UC3842 series

The TL284x and TL384x 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. Some of the internally implemented circuits are 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 ensure latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The TL284x and TL384x 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. Some of the internally implemented circuits are 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 ensure latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.
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技術文件

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類型 標題 日期
* Data sheet TLx84x Current-Mode PWM Controllers datasheet (Rev. J) 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
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-29 UC3842A Family - Frequency Foldback Technique Provides Protection 1999年 9月 5日
Application note DN-30 Programmable Electronic Circuit Breaker 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-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 1999年 9月 5日
Application note DN-65 Considerations in Powering BiCMOS ICs 1999年 9月 5日
Application note DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers 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

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