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UC3842A 正在供货 具有 16V/10V UVLO 和 100% 占空比、温度范围为 0°C 至 70°C 的 30V、1A、500KHz 电流模式 PWM 控制器 Pin-to-pin equivalent with reduced start-up current

产品详细信息

Topology Boost, Buck, Buck-Boost, Flyback, Forward Duty cycle (Max) (%) 100 Supply voltage (Max) (V) 28 UVLO thresholds on/off (V) 16/10 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 500 Gate drive (Typ) (A) 1
Topology Boost, Buck, Buck-Boost, Flyback, Forward Duty cycle (Max) (%) 100 Supply voltage (Max) (V) 28 UVLO thresholds on/off (V) 16/10 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 500 Gate drive (Typ) (A) 1
PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9 SOIC (D) 14 52 mm² 8.65 x 6
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1 mA)
  • 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 500-kHz operation
  • Error amplifier with low output resistance
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1 mA)
  • 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 500-kHz 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 1 mA, 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 that is 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 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 ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited 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 1 mA, 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 that is 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 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 ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited 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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类型 项目标题 下载最新的英语版本 日期
* 数据表 UCx84x Current-Mode PWM Controllers 数据表 (Rev. G) PDF | HTML 11 Jul 2022
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 下载英文版本 (Rev.A) PDF | HTML 16 Jul 2021
应用手册 Understanding Buck-Boost (Inverting) Power Stages in Switch Mode Power Supplies (Rev. B) 12 Mar 2019
选择指南 电源管理指南 2018 (Rev. R) 25 Jun 2018
技术文章 When should you use PWM controllers? 02 Dec 2016
应用手册 DN-62 开关电源拓扑电压模式与 电流模式 下载英文版本 28 Jul 2010
应用手册 U-100A UC3842/3/4/5 提供低成本电流模式控制 下载英文版本 28 Jul 2010
应用手册 全面认识开关型电源中的BUCK-BOOST功率级 (Rev. A) 下载最新的英文版本 (Rev.B) 07 Nov 2005
应用手册 UCC38C42 系列高速 BiCMOS 电流模式 PWM 控制器 07 Feb 2002
应用手册 DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 05 Sep 1999
应用手册 DN-27 UC1842/UC1842A Family - Summary of Functional Differences 05 Sep 1999
应用手册 DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 05 Sep 1999
应用手册 DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 05 Sep 1999
应用手册 DN-65 Considerations in Powering BiCMOS ICs 05 Sep 1999
应用手册 DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers 05 Sep 1999
应用手册 U-111, Practical Considerations in Current Mode Power Supplies 05 Sep 1999
应用手册 了解开关模式电源中的升压功率级 04 Mar 1999
应用手册 了解开关模式电源中的降压功率级 04 Mar 1999

设计和开发

如需其他信息或资源,请查看下方列表,点击标题即可进入详情页面。

仿真模型

UCCx8C42 Unencrypted PSpice Transient Model UCCx8C42 Unencrypted PSpice Transient Model

仿真模型

UCC28C42 PSpice Transient Model UCC28C42 PSpice Transient Model

封装 引脚数 下载
PDIP (P) 8 了解详情
SOIC (D) 14 了解详情
SOIC (D) 8 了解详情

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
  • 认证摘要
  • 持续可靠性监测

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