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TEA1733LT 数据表(PDF) 5 Page - NXP Semiconductors |
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TEA1733LT 数据表(HTML) 5 Page - NXP Semiconductors |
5 / 17 page TEA1733T_TEA1733LT_1 © NXP B.V. 2009. All rights reserved. Objective data sheet Rev. 01 — 26 October 2009 5 of 17 NXP Semiconductors TEA1733T; TEA1733LT GreenChip SMPS control IC When the voltage on pin VCC drops below the UVLO level during normal operation, the controller stops switching and enters Restart mode. In Restart mode the driver output is disabled and the VCC pin voltage is recharged via the resistor to the rectified mains. 7.3 Supply management All internal reference voltages are derived from a temperature compensated on-chip band gap circuit. Internal reference currents are derived from a trimmed and temperature compensated current reference circuit. 7.4 Input voltage detection (VINSENSE pin) In a typical application the mains input voltage can be detected by the VINSENSE pin. As long as the voltage on VINSENSE has not reached the Vstart(VINSENSE) voltage (typically 0.93 V), switching is inhibited. When during operation the VINSENSE voltage drops below Vdet(L)(VINSENSE) (typically 0.72 V) or exceeds Vdet(H)(VINSENSE) (typically 3.52 V), the converter stops switching and performs a restart. If the pin is left open or disconnected, the pin is pulled up by the internal 20 nA (typ.) current source and subsequently the Vdet(H)(VINSENSE) level is reached. This will then trigger a restart protection. An internal clamp of 5.2 V (typ.) protects this pin from excessive voltages. 7.5 Protection input (PROTECT PIN) The pin PROTECT is a general purpose input pin, which can be used to switch off the converter (latched protection). The converter is stopped as soon as the voltage on this pin is pulled above Vdet(H)(PROTECT) (typically 0.8 V) or below Vdet(L)(PROTECT) (typically 0.5 V). A current of 32 µA (typ.) is flowing out of the chip when the pin voltage is V det(L)(PROTECT). A current of 107 µA (typ.) is flowing into the chip when the pin voltage is V det(H)(PROTECT). Fig 4. Start-up sequence, normal operation and restart sequence 014aaa929 starting converter charging VCC capacitor normal operation protection (power down) soft start VCC ISENSE VINSENSE PROTECT OPTIMER Output voltage restart soft start Vstartup Vth(UVLO) Vdet(VINSENSE)(H) Vstart(VINSENSE) Vdet(PROTECT)(H) Vdet(PROTECT)(L) 4.5 V 1.2 V |
类似零件编号 - TEA1733LT |
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类似说明 - TEA1733LT |
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