tea1751lt NXP Semiconductors, tea1751lt Datasheet
tea1751lt
Manufacturer Part Number
tea1751lt
Description
Greenchip Iii Smps Control Ic
Manufacturer
NXP Semiconductors
Datasheet
1.TEA1751LT.pdf
(29 pages)
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1. General description
2. Features
2.1 Distinctive features
2.2 Green features
2.3 PFC green features
The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS)
controller ICs. The TEA1751(L)T (TEA1751T and TEA1751LT) 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 applies
to quasi-resonant operation at high power levels, quasi-resonant operation with valley
skipping, as well as to 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 will ensure high efficiency
at low power and good standby power performance while minimizing audible noise from
the transformer.
The TEA1751(L)T is a MultiChip Module, (MCM), containing 2 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
(SIOI) is used for accurate, high speed protection functions and control.
The TEA1751(L)T enables highly efficient and reliable supplies with power requirements
up to 250 W, to be designed easily and with a minimum number of external components.
I
I
I
I
I
I
I
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
Rev. 01 — 10 July 2008
Integrated PFC and flyback controller.
Universal mains supply operation (70 VAC to 276 VAC).
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.
On-chip start-up current source.
Valley/zero voltage switching for minimum switching losses (NXP patented).
Frequency limitation to reduce switching losses.
Product data sheet
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