主页 电源管理 交流/直流和隔离式直流/直流开关稳压器 PWM 控制器

UCC2889

正在供货

温度范围为 –40°C 至 85°C 的离线电源控制器

产品详情

Topology Flyback Control mode Voltage feed forward Duty cycle (max) (%) 55 Switching frequency (max) (kHz) 250 Features Constant on-time, Error amplifier, Green mode, Light-load efficiency, Soft start UVLO thresholds on/off (V) 8.4/6.3 Operating temperature range (°C) -40 to 85 Rating Catalog Gate drive (typ) (A) 0.2 Vin (max) (V) 9.3
Topology Flyback Control mode Voltage feed forward Duty cycle (max) (%) 55 Switching frequency (max) (kHz) 250 Features Constant on-time, Error amplifier, Green mode, Light-load efficiency, Soft start UVLO thresholds on/off (V) 8.4/6.3 Operating temperature range (°C) -40 to 85 Rating Catalog Gate drive (typ) (A) 0.2 Vin (max) (V) 9.3
SOIC (D) 8 29.4 mm² 4.9 x 6
  • Transformerless Off-line Applications
  • Ideal Primary-side Bias Supply
  • Efficient BiCMOS Design
  • Wide Input Range
  • Fixed or Adjustable Low Voltage Output
  • Uses Low Cost SMD Inductors
  • Short Circuit Protected
  • Optional Isolation Capability

  • Transformerless Off-line Applications
  • Ideal Primary-side Bias Supply
  • Efficient BiCMOS Design
  • Wide Input Range
  • Fixed or Adjustable Low Voltage Output
  • Uses Low Cost SMD Inductors
  • Short Circuit Protected
  • Optional Isolation Capability

The UCC1889 controller is optimized for use as an off-line, low power, low voltage, regulated bias supply. The unique circuit topology utilized in this device can be visualized as two cascaded flyback converters, each operating in the discontinuous mode, and both driven from a single external power switch. The significant benefit of this approach is the ability to achieve voltage conversion ratios of 400V to 12V with no transformer and low internal losses.

The control algorithm utilized by the UCC1889 is to force the switch on time to be inversely proportional to the input line voltage while the switch off time is made inversely proportional to the output voltage. This action is automatically controlled by an internal feedback loop and reference. The cascaded configuration allows a voltage conversion from 400V to 12V to be achieved with a switch duty cycle greater than 10%. This topology also offers inherent short circuit protection since as the output voltage falls to zero, the switch off time approaches infinity.

The output voltage can be easily set to 12V or 18V. Moreover, it can be programmed for other output voltages less than 18V with a few additional components. An isolated version can be achieved with this topology as described further in Unitrode Application Note U-149.

The UCC1889 controller is optimized for use as an off-line, low power, low voltage, regulated bias supply. The unique circuit topology utilized in this device can be visualized as two cascaded flyback converters, each operating in the discontinuous mode, and both driven from a single external power switch. The significant benefit of this approach is the ability to achieve voltage conversion ratios of 400V to 12V with no transformer and low internal losses.

The control algorithm utilized by the UCC1889 is to force the switch on time to be inversely proportional to the input line voltage while the switch off time is made inversely proportional to the output voltage. This action is automatically controlled by an internal feedback loop and reference. The cascaded configuration allows a voltage conversion from 400V to 12V to be achieved with a switch duty cycle greater than 10%. This topology also offers inherent short circuit protection since as the output voltage falls to zero, the switch off time approaches infinity.

The output voltage can be easily set to 12V or 18V. Moreover, it can be programmed for other output voltages less than 18V with a few additional components. An isolated version can be achieved with this topology as described further in Unitrode Application Note U-149.

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技术文档

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类型 标题 下载最新的英语版本 日期
* 数据表 Off-line Power Supply Controller 数据表 (Rev. A) 2003年 2月 20日
选择指南 电源管理指南 2018 (Rev. R) 2018年 6月 25日
应用手册 DN-59A UCC3889 Bias Supply Controller EVM Kit - Schematic 1999年 9月 5日
应用手册 U-149 Elegantly Simple Off-Line Bias Supply for Very Low Power Applications 1999年 9月 5日

设计和开发

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参考设计

PMP8920 — 采用 PFC 转换模式及 LLC 谐振转换器的高效二级通用输入电源

Low EMI, high efficiency, high power factor and reliable power supply are main focus of the PMP8920 design for telecom applications. Transient mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP8911. In addition, (...)
测试报告: PDF
参考设计

PMP8911 — 高效二级通用输入电源-转换模式 PFC,LLC 谐振转换器

Low EMI, high efficiency, high power factor and reliable power supply are main focus of the PMP8911 design for telecom applications. Transient mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP8911. Low EMI is expected (...)
测试报告: PDF
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SOIC (D) 8 查看选项

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  • 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
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  • 制造厂地点
  • 封装厂地点

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