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TEA1755T

NXP Semiconductors
Part Number TEA1755T
Manufacturer NXP Semiconductors
Description HV start-up DCM/QR flyback controller
Published Aug 18, 2015
Detailed Description TEA1755T HV start-up DCM/QR flyback controller with integrated DCM/QR PFC controller Rev. 1.1 — 13 March 2015 Product...
Datasheet PDF File TEA1755T PDF File

TEA1755T
TEA1755T

Overview
TEA1755T HV start-up DCM/QR flyback controller with integrated DCM/QR PFC controller Rev.
1.
1 — 13 March 2015 Product data sheet 1.
General description The GreenChip is the latest generation of green Switched Mode Power Supply (SMPS) controller ICs.
The TEA1755T combines a controller for Power Factor Correction (PFC) and a flyback controller.
Its high level of integration enables cost-effective power supply design using a very low number of external components.
The PFC operates in Quasi-Resonant (QR) or Discontinuous Conduction Mode (DCM), with valley switching.
The specially built-in green functions provide high efficiency at all power levels.
At high power levels the flyback operates in QR mode or DCM with valley detection.
At medium power levels, the flyback controller switches to Frequency Reduction (FR) mode and limits the peak current to an adjustable minimum value.
In low power mode, the PFC switches off to maintain high efficiency.
At very low power levels, when the flyback switching frequency drops below 25 kHz, the flyback converter switches to burst mode.
During the non-switching phase of burst mode, the internal IC supply current is minimized to further optimize efficiency.
Valley switching is used in all operating modes.
The advanced burst mode ensures high-efficiency at low power and good standby power performance while minimizing audible transformer noise.
The TEA1755T is a Multi-Chip Module, (MCM), containing two chips.
The proprietary high-voltage BCD800 process 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 TEA1755T enables easy design of highly efficient and reliable supplies up to 250 W.
These power supply designs are cost-effective, requiring the minimum number of external components.
Remark: All values in this document are typical values unless otherwise stated.
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