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UC2825AQDWRQ1 Arkusz danych(PDF) 6 Page - Texas Instruments |
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UC2825AQDWRQ1 Arkusz danych(HTML) 6 Page - Texas Instruments |
6 / 14 page www.ti.com APPLICATION INFORMATION R T + 3 V (10 mA) 1 * DMAX C T + 1.6 D MAX R T f (1) CLK LEB IC = IR IR R T C T ID = 10 mA V TH R C 3 V 1 k 10 k 70 75 80 85 90 95 100 100 k RT - Timing Resistance - MAXIMUM DUTY CYCLE vs TIMING RESISTANCE W 10 M 1 M 100 k 10 k 1 k 10 k 100 k RT - Timing Resistance - W OSCILLATOR FREQUENCY vs TIMING RESISTANCE UC2825A-Q1 SLUS781 – SEPTEMBER 2007 The oscillator is a sawtooth. 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: Recommended values for RT range from 1 kΩ to 100 kΩ. Control of DMAX less than 70% is not recommended. Figure 1. Oscillator Figure 2. Figure 3. 6 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated |
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