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TEA1781T 数据表(PDF) 6 Page - NXP Semiconductors |
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TEA1781T 数据表(HTML) 6 Page - NXP Semiconductors |
6 / 32 page 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 |
类似零件编号 - TEA1781T |
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类似说明 - TEA1781T |
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