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TEA1782T 数据表(PDF) 10 Page - NXP Semiconductors |
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TEA1782T 数据表(HTML) 10 Page - NXP Semiconductors |
10 / 32 page 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 |
类似零件编号 - TEA1782T |
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类似说明 - TEA1782T |
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