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TEA1738FT Datenblatt(PDF) 8 Page - NXP Semiconductors |
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TEA1738FT Datenblatt(HTML) 8 Page - NXP Semiconductors |
8 / 20 page TEA1738FT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Preliminary data sheet Rev. 1 — 30 December 2010 8 of 20 NXP Semiconductors TEA1738FT GreenChip SMPS control IC 7.10 Current mode control (ISENSE pin) Current mode control is used for its good line regulation. The primary current is sensed by the ISENSE pin across an external resistor R9 (see Figure 3) and compared with an internal control voltage.The internal control voltage is proportional to the CTRL pin voltage (see Figure 6). Leading edge blanking prevents false triggering due to capacitive discharge when switching on the external power switch (see Figure 7). Fig 5. Overpower delay (TEA1738FT) 014aaa930 VOPTIMER VISENSE VO 400 mV protection high load high load normal load Vprot(OPTIMER) IO Fig 6. Peak current control frequency reduction 0.2 0.4 0.6 0 04 3 12 014aab293 VCTRL (V) Vsense(max) (V) frequency reduction frequency increase |
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