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TEA1732TS Folha de dados(PDF) 7 Page - NXP Semiconductors |
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7 / 20 page TEA1732TS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 1 — 18 March 2014 7 of 20 NXP Semiconductors TEA1732TS GreenChip SMPS control IC 7.7 Overpower timer A temporary overload situation is allowed. If Vctrl(Ipeak) (see Figure 1) set by pin CTRL exceeds 400 mV, an internal timer is started. If the overload situation continues to exist for more than 60 ms (typical), an OverPower Protection (OPP) is triggered (see Figure 7). The TEA1732TS enters the overpower restart mode when the overload time-out is reached. In overpower restart mode, the VCC capacitor is discharged to UVLO level and then charged to the start-up level three times before the converter switches again. 7.8 Current mode control (pin ISENSE) Current mode control is used because it ensures a good line regulation. Pin ISENSE senses the primary current across external resistor R6 and compares it with an internal control voltage. The internal control voltage is proportional to the CTRL pin voltage (see Figure 8). Fig 7. Overpower delay |
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