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UCC25705 Datasheet(PDF) 9 Page - Texas Instruments |
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UCC25705 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 22 page  UCC25705, UCC25706, UCC35705, UCC35706 HIGH-SPEED VOLTAGE MODE PULSE WIDTH MODULATOR SLUS473B -- NOVEMBER 1999 -- REVISED OCTOBER 2010 9 www.ti.com FUNCTIONAL DESCRIPTION component selection for oscillator without duty cycle clamp (MODE = 0) For a power converter with the following specifications: D VIN(min) =18V D VIN(max) =75V D VIN(shutdown) =15V D FOSC =1MHz With these specifications, VFF(min) = 18 15 = 1.2 V (1) Pick CT = 220 pF (2) Calculate RT. RT = V IN(min) V FF(min) × 1 F OSC − 75 ns CT TYPICAL CHARACTERISTICS Figure 4 --50 --25 0 25 50 75 100 125 Temperature 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 UCC35705 UVLO THRESHOLDS vs TEMPERATURE °C Figure 5 --50 --25 0 25 50 75 100 125 Temperature 7 8 9 10 11 12 13 °C UCC35706 UVLO THRESHOLDS vs TEMPERATURE |
Similar Part No. - UCC25705_14 |
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Similar Description - UCC25705_14 |
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