General description

The TEA1753T is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. The TEA1753T 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 efficiency applies to quasi-resonant operation at high-power levels, quasi-resonant operation with valley skipping, as well as 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 an adjustable minimum value. This mode ensures high efficiency at low-power and good standby power performance while minimizing audible noise from the transformer.
The controller is switched to the power-down mode for no-load operation. In this mode, the controller is shut down for very low standby power applications.
The TEA1753T is a Multi-Chip Module, (MCM), containing two 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 (SOI) is used for accurate, high-speed protection functions and control.
The TEA1753T enables the design of highly efficient and reliable supplies with power requirements of up to 250 W using the minimum number of external components.
Remark: All values provided throughout this data sheet are typical values unless otherwise stated.

Features and benefits

Distinctive features
■ Integrated PFC and flyback controller
■ Universal mains supply operation (70 V (AC) to 276 V (AC))
■ 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
■ Adjustable PFC switch off delay

Green features
■ On-chip start-up current source
■ Power down functionality for very low standby power

PFC green features
■ Valley/Zero Voltage Switching (ZVS) 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)
■ Frequency reduction with adjustable 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 with demagnetization detection for both converters (NXP patented)
■ UnderVoltage Protection (UVP) (foldback during overload)
■ Accurate OverVoltage Protection (OVP) for both converters (adjustable for flyback converter)
■ Mains voltage independent OverPower Protection (OPP)
■ Open control loop protection for both converters. The open-loop protection on the flyback converter is safe restart
■ OverTemperature Protection (OTP)
■ Low and adjustable OverCurrent Protection (OCP) trip level for both converters
■ General-purpose latched protection input for system OverTemperature Protection (OTP) for example

Applications
■ The device is used in all applications requiring an efficient and cost- effective power
supply solutions up to 250 W. Notebook adapters in particular benefit from the high
level of integration