代理產線

TEA1750T

 2007-04-11

【基本資料】

【產品特性】

‧Green features PFC part
- Valley/zero voltage switching for minimum switching losses
- Frequency limitation to reduce switching losses
- Burst mode operation if a low load is detected at the flyback output
‧Green features flyback part
- Valley switching for minimum switching losses
- Frequency reduction with fixed minimum peak current at low power operation to maintain high
efficiency at low output power levels
‧Protection features
- Safe restart mode for system fault conditions
- Continuous mode protection by means of demagnetization detection for both converters
- Undervoltage protection (foldback during overload)
- Accurate over-voltage protection for both converters (adjustable for flyback converter)
- Open control loop protection for both converters
- IC over-temperature protection
- Low and adjustable over-current protection trip level for both converters
- Soft (re)start for both converters
- Mains undervoltage protection/ brown out protection
- General purpose input for latched protection, e.g. to be used for system over-temperature protection
‧Integrated PFC and flyback controller
‧Universal mains supply operation (70 V to 276 VAC)
‧High level of integration, resulting in a very low external component count

【產品應用】

Cost-effective power supply solution from 75W up to 250 W. Notebook adapters

【文字介紹】

The GreenChip™III is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. The TEA1750 integrates a controller for power factor correction 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 allow a high efficiency at all power levels. This holds for quasi-resonant operation at high power levels, quasi-resonant operation with valley skipping, as well as in reduced frequency operation at lower power levels. At low power (standby) levels, the power factor controller switches over to burst mode control to maintain high efficiency. In burst mode soft-start and soft-stop is added to eliminate audible noise. Highly efficient and reliable
supplies can easily be designed using the GreenChipIII control IC.
The proprietary high voltage BCD800 process makes direct start-up possible from the rectified universal mains voltage in an effective and green way. A second low voltage SOI IC is used for accurate, high speed protection functions and control.