TEA1751TN1

The TEA1751T is the third generation of green Switched Mode Power Supply (SMPS)
controller ICs. The TEA1751T 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 25 % of its maximum value. This mode ensures high
efficiency at low-power and good standby power performance while minimizing audible
noise from the transformer.
The TEA1751T 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 TEA1751T enables the design of highly efficient and reliable supplies with power
requirements of up to 250 W using the minimum number of external components.

Category: Power Management (PMIC)

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SPECIFICATION

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
Green features
 On-chip start-up current source
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 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 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 input for latched protection to provide system OverTemperature
Protection (OTP) for example