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NXP Semiconductors Electronic Components Datasheet

TEA1752LT Datasheet

GreenChip III SMPS control IC

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TEA1752T; TEA1752LT
GreenChip III SMPS control IC
Rev. 02 — 24 June 2010
Product data sheet
1. General description
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The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS)
controller ICs. The TEA1752T and TEA1752LT combine a controller for Power Factor
Correction (PFC) and a flyback controller. The high level of integration facilitates the
design of a cost-effective power supply using a minimum number of external components.
The special built-in green functions provide high efficiency at all power levels. This applies
to quasi-resonant operation at high power levels, quasi-resonant operation with valley
skipping and 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 will ensure high
efficiency at low power and good standby power performance while minimizing audible
noise from the transformer.
The TEA1752(L)T is a MultiChip Module (MCM), containing two chips. The proprietary
high voltage BCD800 process which enables direct start-up from the rectified universal
mains voltage in an effective and green way and a low voltage Silicon-On Insulator (SOI)
which provides accurate, high speed protection functions and control.
The TEA1752(L)T enables highly efficient and reliable supplies with power requirements
of up to 250 W to be designed easily and with a minimum number of external
components.
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 Semiconductors
patented, US patent number: US7575280)
„ High level of integration, resulting in a very low external component count and a
cost-effective design
„ Adjustable PFC switch-off delay
2.2 Green features
„ On-chip start-up current source


NXP Semiconductors Electronic Components Datasheet

TEA1752LT Datasheet

GreenChip III SMPS control IC

No Preview Available !

NXP Semiconductors
TEA1752T; TEA1752LT
GreenChip III SMPS control IC
2.3 PFC green features
„ Valley/zero voltage switching for minimum switching losses
(NXP Semiconductors patented, US patent number: US6256210)
„ Frequency limitation to reduce switching losses
„ PFC is switched off when a low load is detected at the flyback output
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2.4 Flyback green features
„ Valley switching for minimum switching losses
(NXP Semiconductors patented, US patent number: US6256210)
„ 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 by means of demagnetization detection for both
converters (NXP Semiconductors patented, patent number: US5032967)
„ UnderVoltage Protection (UVP) (foldback during overload)
„ Accurate OverVoltage Protection (OVP) for PFC
„ Accurate, adjustable OverVoltage Protection (OVP) for flyback converter
(NXP Semiconductors patented, patent number: US6542386)
„ Mains voltage independent OverPower Protection (OPP)
(NXP Semiconductors patented, patent number: US6542386)
„ Open control loop protection for both converters. The open-loop protection on the
flyback converter is latched on the TEA1752LT and safe restart on the TEA1752T
„ IC overtemperature protection
„ Low and adjustable OverCurrent Protection (OCP) trip level for both converters
„ General purpose input for latched protection, e.g. to be used for system
OverTemperature Protection (OTP)
3. Applications
„ All applications requiring efficient and cost-effective power supply solutions to 250 W.
Notebook adapters in particular can benefit from the high level of integration
TEA1752T_LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 24 June 2010
© NXP B.V. 2010. All rights reserved.
2 of 34


Part Number TEA1752LT
Description GreenChip III SMPS control IC
Maker NXP Semiconductors
Total Page 30 Pages
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