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UC1637-SP датащи(PDF) 4 Page - Texas Instruments |
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UC1637-SP датащи(HTML) 4 Page - Texas Instruments |
4 / 11 page 20 UC1637-SP SLUS950 – FEBRUARY 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range, VS = 15 V, –VS = –15 V, +VTH = 5 V, –VTH = –5 V, RT = 16.7 kΩ, CT = 1500 pF, TA = –55°C to 125°C = TJ (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OUTPUT SECTION ISINK = 20 mA –14.9 –13 Output low level V ISINK = 100 mA –14.5 –13 ISOURCE = 20 mA 13 13.5 Output high level V ISOURCE = 100 mA 12 13.5 Rise time CL = 1 nF, TJ = 25°C (4) 100 600 ns Fall time CL = 1 nF, TJ = 25°C (4) 100 300 ns (4) Parameters ensured by design and/or characterization, if not production tested. FUNCTIONAL DESCRIPTION The following is a description of each of the functional blocks shown in the Functional Block Diagram. Oscillator The oscillator consists of two comparators, a charging and discharging current source, a current source set terminal, ISET, and a flip-flop. The upper and lower threshold of the oscillator waveform is set externally by applying a voltage at pins +VTH and -VTH respectively. The +VTH terminal voltage is buffered internally and also applied to the ISET terminal to develop the capacitor charging current through RT. If RT is referenced to -VS as shown in Figure 1, both the threshold voltage and charging current will vary proportionally to the supply differential, and the oscillator frequency will remain constant. The triangle waveform oscillator's frequency and voltage amplitude are determined by the exernal components using the formulas given in Figure 1. Figure 1. Oscillator Setup 4 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UC1637-SP |
Аналогичный номер детали - UC1637-SP |
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Аналогичное описание - UC1637-SP |
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