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TEA1721FT Scheda tecnica(PDF) 4 Page - NXP Semiconductors |
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TEA1721FT Scheda tecnica(HTML) 4 Page - NXP Semiconductors |
4 / 14 page TEA1721FT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 1.1 — 7 June 2012 4 of 14 NXP Semiconductors TEA1721FT HV start-up flyback controller with integrated MOSFET for 5 W 4. Pinning information 4.1 Pinning 4.2 Pin description 5. Functional description 5.1 Start-up The TEA1721 starts up by charging the VCC capacitor until the VCC(start) level. The charging current flows from the high voltage DRAIN pin via an internal start-up current source to the VCC pin. Once the start level has been reached the start-up current source is switched off. During switching operation, the start-up current source remains current-less and has zero bleeder loss. 5.2 Primary sensing The FB input senses the reflected secondary voltage on the primary side. The FB input has a sample and hold function that samples the FB voltage on the secondary stroke to control the output voltage. The sampled VFBS voltage is the input for the TEA1721’s control loop and defines the operating mode. Fig 2. Pinning top view TEA1721 GND1 DRAIN GND2 GND3 SOURCE FB VCC 001aan294 1 2 3 4 6 5 7 Pin Pin name I/O type Pin description 1 GND1 ground 2 GND2 ground 3 GND3 ground 4 FB I feedback input for voltage sensing 5 VCC I supply input 6 SOURCE O source for power switch 7 DRAIN I drain of power switch - - high voltage spacer |
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