TL2842B

正在供货

具有 16V/10V UVLO 和 100% 占空比、温度范围为 -40°C 至 85°C 的 30V、0.2A 高性能 500KHz 电流模式 PWM

产品详情

Vin (max) (V) 30 Operating temperature range (°C) -40 to 85 Control mode Current Topology Boost, Flyback Rating Catalog Features Adjustable switching frequency, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 100
Vin (max) (V) 30 Operating temperature range (°C) -40 to 85 Control mode Current Topology Boost, Flyback Rating Catalog Features Adjustable switching frequency, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 100
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
  • Low Start-Up Current (<0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Current Mode Operation to 500 kHz
  • Automatic Feed-Forward Compensation
  • Latching PWM for Cycle-by-Cycle Current Limiting
  • Internally Trimmed Reference With Undervoltage Lockout
  • High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis
  • Double-Pulse Suppression

  • Low Start-Up Current (<0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Current Mode Operation to 500 kHz
  • Automatic Feed-Forward Compensation
  • Latching PWM for Cycle-by-Cycle Current Limiting
  • Internally Trimmed Reference With Undervoltage Lockout
  • High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis
  • Double-Pulse Suppression

The TL284xB and TL384xB 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. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is 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 TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V).

Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842B and TLx844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are 8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for operation from -40°C to 85°C. The TL384xB-series devices are characterized for operation from 0°C to 70°C.

The TL284xB and TL384xB 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. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is 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 TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V).

Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842B and TLx844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are 8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for operation from -40°C to 85°C. The TL384xB-series devices are characterized for operation from 0°C to 70°C.

下载 观看带字幕的视频 视频

您可能感兴趣的相似产品

open-in-new 比较替代产品
功能优于比较器件,可直接替换
UC2842A 正在供货 具有 16V/10V UVLO 100% 占空比、温度范围为 40°C 至 85°C 的 30V、1A、500KHz 电流模式 PWM 控制器 Pin-to-pin equivalent alternate product

技术文档

star =有关此产品的 TI 精选热门文档
未找到结果。请清除搜索并重试。
查看全部 18
类型 标题 下载最新的英语版本 日期
* 数据表 High Performance Current-Mode PWM Controllers 数据表 (Rev. B) 2007年 7月 2日
应用简报 Flyback Selection Guide PDF | HTML 2022年 6月 23日
应用手册 使用 TI 运算放大器调节开关模式电源电流信号 (Rev. A) PDF | HTML 英语版 (Rev.A) PDF | HTML 2021年 7月 16日
应用手册 Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 2019年 3月 12日
应用手册 DN-62 开关电源拓扑电压模式与 电流模式 英语版 2010年 7月 28日
应用手册 U-100A UC3842/3/4/5 提供低成本电流模式控制 英语版 2010年 7月 28日
应用手册 UCC38C42 系列高速 BiCMOS 电流模式 PWM 控制器 2002年 2月 7日
应用手册 DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 1999年 9月 5日
应用手册 DN-27 UC1842/UC1842A Family - Summary of Functional Differences 1999年 9月 5日
应用手册 DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection 1999年 9月 5日
应用手册 DN-30 Programmable Electronic Circuit Breaker 1999年 9月 5日
应用手册 DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 1999年 9月 5日
应用手册 DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 1999年 9月 5日
应用手册 DN-65 Considerations in Powering BiCMOS ICs 1999年 9月 5日
应用手册 DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers 1999年 9月 5日
应用手册 U-111, Practical Considerations in Current Mode Power Supplies 1999年 9月 5日
应用手册 了解开关模式电源中的升压功率级 1999年 3月 4日
应用手册 了解开关模式电源中的降压功率级 1999年 3月 4日

设计和开发

如需其他信息或资源,请点击以下任一标题进入详情页面查看(如有)。

参考设计

PMP22899 — 24W、120VAC 至 24VDC 降压转换器参考设计

该参考设计使用 TL2842B 作为高侧降压转换器,将 120Vac 输入转换为 24Vdc 输出,能够承受 1A 的负载。在满载时,该参考设计可实现低峰峰值输出纹波以及超过 88% 的效率。该参考设计采用 2 层 PCB 和单面组装方式构建而成。
测试报告: PDF
原理图: PDF
封装 引脚 CAD 符号、封装和 3D 模型
PDIP (P) 8 Ultra Librarian
SOIC (D) 14 Ultra Librarian
SOIC (D) 8 Ultra Librarian

订购和质量

包含信息:
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息:
  • 制造厂地点
  • 封装厂地点

支持和培训

视频