Datasheet > TEA1771

TEA1771

更新时间： 2024-11-11 05:53:03

品牌	Logo	应用领域
恩智浦 - NXP		PC
页数	文件大小	规格书
25页	142K
描述
GreenChip PC primary control IC

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TEA1771 数据手册

TEA1771

GreenChip PC primary control IC

Rev. 01 — 6 February 2009

Product data sheet

1. General description

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.

2. Features

I Designed for ATX PC power supplies

I Universal mains operation, 90 V (AC) to 265 V (AC)

I Integrated start-up current source

I Integrated high-voltage, high-side active clamp reset switch

I Feed-forward regulation

I Enhanced efﬁciency in Standby mode and Normal mode

I OverVoltage Protection (OVP)

I OverCurrent Protection (OCP)

I Short-Winding Protection (SWP)

I Low external component count

I Soft (re)start

I High voltage ramp-up detection assuring Zero Voltage Switching (ZVS) of the reset

switch

I Available in a 24-pin SO package

3. Applications

I PC desktop power supply

12 3 4 5 6 7...25

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