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TEA1782T 数据表(PDF) 10 Page - NXP Semiconductors

部件名 TEA1782T
功能描述  GreenChip PC secondary control ICs
Download  32 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TEA1782T 数据表(HTML) 10 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
10 of 32
NXP Semiconductors
TEA1781T; TEA1782T
GreenChip PC secondary control ICs
7.5 Soft start
When the TEA1782T enters the Protection/Standby mode after start-up, the 5 V standby
output is started up via a soft start. The main output voltages, 3.3 V, 5 V, 12 V and
−12 V
are started up via a soft start when the TEA1782T enters the Normal mode. A soft start
implies that the outputs will rise gradually and simultaneously from zero to their required
value during a defined period (
≈ 15 ms).
When PS_OFF is turned low, the main outputs of the TEA178x chip set ensure that power
sequencing is applied according to the ATX12V specification of Intel, i.e., the 12 V and 5 V
outputs must be equal to, or greater than, the 3.3 V output during power-up and normal
operation.
7.6 Enable
The TEA1782T is the master of the system. The required duty cycle is communicated to
the primary controller TEA1771T via the opto coupler. The TEA1782T communicates to
the TEA1781T via the enable signal, see Figure 9, if the main outputs are enabled or
disabled. If the system is in Normal mode, the voltage of the enable signal exceeds the
trip level, Vtrip(ENABLE), enabling all outputs. Otherwise the main outputs are disabled.
Fig 8.
Enable Normal mode assures a proper start-up of the PFC
D1
014aaa188
R1
D2
R2
C1
PS_ON#
5 V standby
PS_OFF
TEA1782
IENABLE > Iprot(ENABLE)+ EN_NM
+ PS_OFF+ PROT_12V + UVP_STB
STARTUP
VENABLE = 4 V
PROT/STDB
VENABLE = 4 V
NORMAL
VENABLE = 11 V
SYSTEM
RESTART
system failure
detection
VVDD > Vstartup(VDD)
VVDD < Vstop(VDD)
PS_OFF
Digital control


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