tea1771t NXP Semiconductors, tea1771t Datasheet
tea1771t
Manufacturer Part Number
tea1771t
Description
Greenchip Pc Primary Control Ic
Manufacturer
NXP Semiconductors
Datasheet
1.TEA1771T.pdf
(25 pages)
1. General description
2. Features
3. Applications
The TEA1771 is a primary control IC for an active clamp forward converter. This converter
enables higher duty cycles of up to 70 %. A higher maximum duty cycle lowers the
required breakdown voltage of both the primary and secondary switches, reducing the
total cost of the system.
The IC is optimized for (ATX) PC power supplies. Together with the TEA1781 and
TEA1782 a unique system can be made that reduces costs by integrating the standby
supply. It assures high output voltage accuracy and avoids cross regulation as the output
voltages are regulated separately. This system exceeds the current and proposed
efficiency standards such as 80 plus-gold, energy star and blue angel.
The TEA1771 is implemented in the high voltage EZ-HV SOI process. It enables direct
start-up from the rectified mains voltage, excluding the need for a start-up resistor. The
high voltage reset switch, required for the active clamp, is integrated in the IC. The IC has
a feed-forward control regulation, avoiding high resonant voltage peaks as a result of
output load or input voltage transients. This also assures proper regulation of the output
voltages at input voltage variations.
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TEA1771
GreenChip PC primary control IC
Rev. 01 — 6 February 2009
Designed for ATX PC power supplies
Universal mains operation, 90 V (AC) to 265 V (AC)
Integrated start-up current source
Integrated high-voltage, high-side active clamp reset switch
Feed-forward regulation
Enhanced efficiency in Standby mode and Normal mode
OverVoltage Protection (OVP)
OverCurrent Protection (OCP)
Short-Winding Protection (SWP)
Low external component count
Soft (re)start
High voltage ramp-up detection assuring Zero Voltage Switching (ZVS) of the reset
switch
Available in a 24-pin SO package
PC desktop power supply
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