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NXP Semiconductors Electronic Components Datasheet

TEA1751LT Datasheet

GreenChip III SMPS control IC

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TEA1751LT pdf
TEA1751T
HV start-up DCM/QR flyback controller with integrated
DCM/QR PFC controller
Rev. 3 — 10 January 2013
Product data sheet
1. General description
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.
Remark: All values provided throughout this data sheet are typical values unless
otherwise stated.


NXP Semiconductors Electronic Components Datasheet

TEA1751LT Datasheet

GreenChip III SMPS control IC

No Preview Available !

TEA1751LT pdf
NXP Semiconductors
TEA1751T
HV start-up flyback controller with integrated PFC controller
2. Features and benefits
2.1 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
2.2 Green features
On-chip start-up current source
2.3 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
2.4 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
2.5 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
3. 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 can benefit from the
high level of integration
TEA1751T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 10 January 2013
© NXP B.V. 2013. All rights reserved.
2 of 31


Part Number TEA1751LT
Description GreenChip III SMPS control IC
Maker NXP Semiconductors
Total Page 30 Pages
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