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UCC35706DGK Datasheet(PDF) 9 Page - Texas Instruments |
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UCC35706DGK Datasheet(HTML) 9 Page - Texas Instruments |
9 / 12 page UCC25705, UCC25706, UCC35705, UCC35706 HIGHSPEED VOLTAGE MODE PULSE WIDTH MODULATOR SLUS473A – NOVEMBER 1999 – REVISED MARCH 2001 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) = 18 V D VIN(max) = 75 V D VIN(shutdown) = 15 V D FOSC = 1 MHz With these specifications, V FF(min) + 18 15 + 1.2 V (1) Pick CT = 220 pF (2) Calculate RT. R T + V IN(min) V FF(min) 1 F OSC * 75 ns C T 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 |
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