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TEA1781T 数据表(PDF) 6 Page - NXP Semiconductors

部件名 TEA1781T
功能描述  GreenChip PC secondary control ICs
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TEA1781T 数据表(HTML) 6 Page - NXP Semiconductors

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TEA1781_82_1
© NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 01 — 13 February 2009
6 of 32
NXP Semiconductors
TEA1781T; TEA1782T
GreenChip PC secondary control ICs
7.
Functional description
7.1 Introduction
A PC power supply has to supply a number of different supply voltages: 12 V, 5 V, 3.3 V,
−12 V and 5 V standby. To achieve the required output voltage accuracy, the systems of
today require dissipative post regulations.
Because the system must be able to switch off the main supplies (12 V, 5 V, 3.3 V,
−12 V)
in Standby mode but keep the 5 V standby in operation, a separate standby supply is still
common practice.
With the GreenChip PC chip set (TEA1771T, TEA1781T, TEA1782T) a system
configuration is introduced that integrates the post regulation and combines the main and
standby converter into a single system. This high level of integration reduces the total cost
of the system.
Because the output voltages are regulated separately, it makes the design of the
converter easier as none of the output voltages is directly related to the number of turns
on the transformer.
One of the main differences of this topology compared to commonly used solutions is the
use of switches instead of Schottky diodes, although the rectifying switch is a so-called
bidirectional switch. This switch is built up by two standard FETs in anti-series.
PS_OFF
9
power supply off (via delay network connected to PS_ON#)
ENABLE
10
enabling Normal mode
PGND_12V
11
power ground 12 V output
GSF_12V
12
gate driver switch SF_12V
GND
13
ground
GND
14
ground
VDD
15
supply voltage
GSF_STB
16
gate driver switch SF_stb
PGND_STB
17
power ground standby output
PGOOD
18
PowerGood (delay setting for power OK)
OPTO
19
opto coupler
VOUT_STB
20
output voltage standby output
CS_STB
21
current sense standby output
OCP_STB
22
overcurrent protection standby output
DF_STB
23
drain voltage of switch SF_stb
GSB_STB
24
gate driver switch SB_stb
FSB_STB
25
gate driver switch SB_stb
WND_SEC_1
26
secondary transformer 12 V / standby winding voltage
GSR
27
gate driver switch SR (12 V)
FSR
28
floating supply switch SR (12 V)
Table 3.
TEA1782T Pin description …continued
Symbol
Pin
Description


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