NXP TEA1751电源皇冠体育365器PFC和反激把持方案

admin • 2018-10-08 06:44 来源:未知 EG0

  NXP公司的TEA1751是第叁代绿色开关电源(SMPS)把持器,集儿子成了功比值因儿子修改(PFC)和反激把持器,使用于对本钱敏感和什分低外面接元件的开关电源.畅通用输入电压从70VAC到276VAC,带正确的最父亲输入电压的副指伸PFC. TEA1751(L)T是副芯片模块,采取压服的BCD800工艺创造,故此却直接从整顿流动的前线电压上宗触动. TEA1751是适宜高臻250W的电源处理方案.本文伸见了TEA1751(L)T的各项特点,方框图, 典型运用框图以及拥有完整顿干用运用电路图。

  GreenChip III TEA1751: integrated PFC and flyback controller

  The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. The TEA1751(L)T (TEA1751T and TEA1751LT) combines a controller for Power Factor Correction (PFC) and a flyback controller. Its high level of integration allows the design of a cost-effective power supply with a very low number of external components.

  The special built-in green functions provide high efficiency at all power levels. This applies to quasi-resonant operation at high power levels, quasi-resonant operation with valley skipping, as well as to reduced frequency operation at lower power levels. At low power levels, the PFC switches off to maintain high efficiency.

  During low power conditions, the flyback controller switches to frequency reduction mode and limits the peak current to 25 % of its maximum value. This will ensure high efficiency at low power and good standby power performance while minimizing audible noise from the transformer.

  The TEA1751(L)T is a MultiChip Module, (MCM), containing 2 chips. The proprietary high voltage BCD800 process which makes direct start-up possible from the rectified universal mains voltage in an effective and green way. The second low voltage Silicon On Insulator (SIOI) is used for accurate, high speed protection functions and control.

  The TEA1751(L)T enables highly efficient and reliable supplies with power requirements up to 250 W, to be designed easily and with a minimum number of external components.


  Distinctive features

  Integrated PFC and flyback controller.

  Universal mains supply operation (70 VAC to 276 VAC).

  Dual boost PFC with accurate maximum output voltage (NXP patented).

  High level of integration, resulting in a very low external component count and a cost-effective design.

  Green features

  On-chip start-up current source.

  PFC green features

  Valley/zero voltage switching for minimum switching losses (NXP patented).

  Frequency limitation to reduce switching losses.

  PFC is switched off when a low load is detected at the flyback output.

  Flyback green features

  ?Valley switching for minimum switching losses (NXP patented).