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UC1823AL883B Datasheet(PDF) 6 Page - Texas Instruments |
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UC1823AL883B Datasheet(HTML) 6 Page - Texas Instruments |
6 / 15 page UC1823A,UC2823A, UC2823B, UC3823A,UC3823B,UC1825A, UC2825A,UC2825B,UC3825A,UC3825B SLUS334C − AUGUST 1995 − REVISED AUGUST 2004 www.ti.com 6 APPLICATION INFORMATION The oscillator of the UC3823A, UC3823B, UC3825A, and UC3825B is a saw tooth. The rising edge is governed by a current controlled by the RT pin and value of capacitance at the CT pin (CCT). The falling edge of the sawtooth sets dead time for the outputs. Selection of RT should be done first, based on desired maximum duty cycle. CT can then be chosen based on the desired frequency (RT) and DMAX. The design equations are: R T + 3V (10 mA) 1 * D MAX C T + 1.6 D MAX R T f Recommended values for RT range from 1 kΩ to 100 kΩ. Control of DMAX less than 70% is not recommended. UDG−95102 Figure 1. Oscillator 10 M 1 M 100 k 10 k 1 k 10 k 100 k Figure 2 RT − Timing Resistance − W OSCILLATOR FREQUENCY vs TIMING RESISTANCE Figure 3 1 k 10 k 70 75 80 85 90 95 100 100 k RT − Timing Resistance − W MAXIMUM DUTY CYCLE vs TIMING RESISTANCE (1) |
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