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TEA1738T Datenblatt(PDF) 9 Page - NXP Semiconductors |
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9 / 21 page TEA1738T_TEA1738LT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Preliminary data sheet Rev. 1 — 31 December 2010 9 of 21 NXP Semiconductors TEA1738T; TEA1738LT GreenChip SMPS control IC Leading edge blanking prevents false triggering due to capacitive discharge when switching on the external power switch (see Figure 8). 7.11 Overpower or high/low line compensation (VINSENSE and ISENSE pins) The overpower compensation function can be used to realize a maximum output power which is nearly constant over the full input mains. The overpower compensation circuit measures the input voltage on the VINSENSE pin and outputs a proportionally dependent current on the ISENSE pin. The DC voltage across the soft start resistor limits the maximum peak current on the current sense resistor (see Figure 9). At low output power levels the overpower compensation circuit is switched off. Fig 7. Peak current control Fig 8. Leading edge blanking frequency reduction 0.2 0.4 0.6 0 04 3 12 014aab293 VCTRL (V) Vsense(max) (V) frequency reduction frequency increase tleb Vsense(max) VISENSE t 014aaa932 |
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