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TEA1703T датащи(PDF) 6 Page - NXP Semiconductors |
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TEA1703T датащи(HTML) 6 Page - NXP Semiconductors |
6 / 15 page TEA1703T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 2.3 — 28 April 2011 6 of 15 NXP Semiconductors TEA1703T GreenChip SMPS standby control IC 7.2 Standby operation When the output load of the switched-mode power supply falls, the voltage on pin PSENSE also falls. When the voltage on pin PSENSE falls below the Vth(Psense) level, the TEA1703T activates its pin OPTO output as soon as its pin SWDET current is above the Ith(det)sw level. In a typical application, the switched-mode power supply is disabled by the TEA1703T as soon as its pin OPTO output is activated. The application’s output voltage will then start to fall. After a period dependent on the output load and the output capacitor value, the VSENSE voltage falls below the Vth(Vsense) level and the OPTO output is disabled again. This restarts the primary-side converter. If the output load remains low, the application reverts to standby mode again after the output capacitor has been recharged. When a normal load is detected, the converter resumes normal operation; see Figure 5. 7.3 Voltage sensing (pin VSENSE) If the voltage on pin VSENSE is above the Vth(Vsense) level, pin VSENSE outputs a current IO(Vsense), which, in combination with the external resistive divider, creates a hysteresis on the adapter output voltage level. In a typical application, the effective output voltage hysteresis is larger than that set by IO(Vsense) and the resistive divider. This is because the external PSENSE filter circuit keeps the PSENSE voltage above the Vth(Psense) level as long as the output capacitor is not charged to the normal output voltage level. Fig 5. Standby operation signals Vth(Vsense) Vo(nom) Vth(Psense) Ith(det)sw normal operation standby standby normal operation low output load stopping SMPS re-starting SMPS re-starting SMPS stopping SMPS output load output voltage VSENSE PSENSE SWDET OPTO primary side converter active 001aan123 |
Аналогичный номер детали - TEA1703T |
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Аналогичное описание - TEA1703T |
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