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TEA1792ATS 데이터시트(PDF) 8 Page - NXP Semiconductors |
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TEA1792ATS 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 13 page TEA1792ATS All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Objective data sheet Rev. 1 — 10 August 2012 8 of 13 NXP Semiconductors TEA1792ATS GreenChip synchronous rectifier controller 11. Application information A switched mode power supply with the TEA1792ATS consists of a primary side discontinuous conduction mode flyback controller, a transformer and an output stage with a feedback circuit. A MOSFET (Qsec) is used for low conduction losses in the output state. The TEA1792ATS controls this MOSFET. The timing for the synchronous rectifier switch is derived from the voltage sensed on the SRSENSE pin. The resistor in the SRSENSE connection protects the TEA1792ATS from excessive voltages. The RSRSENSE resistor is typically 1 k. Higher values can impair correct timing, lower values do not provide sufficient protection. Fig 4. Application diagram high side rectification Fig 5. Application diagram low side rectification VIN TR PRIMARY SIDE CONTROLLER Qprim CVCC GND SELREG DRIVER IC SRSENSE VCC Qsec RSRSENSE RDRIVER Vo Cout aaa-000138 DRIVER SRSENSE VCC Vo GND IC PRIMARY SIDE CONTROLLER VIN Qsec Cout RSRSENSE RDRIVER Qprim TR SELREG aaa-000139 |
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