UCC2889 - 脱机电源控制器

UCC2889是TI德州仪器公司的一款PWM与谐振控制器产品，UCC2889是脱机电源控制器，本站介绍了UCC2889的封装应用图解、特点和优点、功能等，并给出了与UCC2889相关的TI元器件型号供参考。

UCC2889 - 脱机电源控制器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

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.

产品特性

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

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