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UCC35705DGK Datasheet(PDF) 7 Page - Texas Instruments |
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UCC35705DGK Datasheet(HTML) 7 Page - Texas Instruments |
7 / 12 page UCC25705, UCC25706, UCC35705, UCC35706 HIGHSPEED VOLTAGE MODE PULSE WIDTH MODULATOR SLUS473A – NOVEMBER 1999 – REVISED MARCH 2001 7 www.ti.com FUNCTIONAL DESCRIPTION component selection for oscillator with duty cycle clamp (MODE = 1) 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 D DMAX = 0.78 at VIN(min) In this mode, the on-time is approximately: D TON(max) = 780 ns D TOFF(min) = 220 ns D VFF(min) = 18 15 = 1.20 V (1) Pick CT = 220 pF. (2) Calculate RT. R T + V IN min T ON(max) V FF min C T RT = 51.1 kΩ (3) RDISCH R DISCH + 30 R T 1 ) V FF(min) V IN(min) R T C T T OFF(min) RDISCH = 383 kΩ. IDISCH must be between 25 µA and 250 µA over the entire VIN range. With the calculated values, IDISCH ranges from 44 µA to 193 µA, within the allowable range. If IDISCH is too high, CT must be decreased. (4) RFF R FF + V FF(min) R DISCH 2 V IN(min) * 1 The nearest 1% standard value to the calculated value is 13.7 k. |
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