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UC28023DWRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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UC28023DWRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 19 page UC28023 UC28025 SLUS557F -- MARCH 2003 -- REVISED AUGUST 2010 11 www.ti.com APPLICATION INFORMATION OSCILLATOR Figure 7. Oscillator Circuit UDG--03052 6 4 CT UC2802x CLOCK 3V 5 RT Blanking 5.1 V IR IC= IR TD 400 μA Figure 8. 0.47 0.22 0.047 1.0 2.2 4.7 10.0 22.0 47 0.10 2.20 0.47 1.00 4.70 10.0 100 CT -- Timing Capacitance -- nF DEAD TIME vs TIMING CAPACITANCE 3kΩ≤ RT ≤ 100 kΩ Figure 9. Oscillator Circuit 10 k 1k 100 k 1 k 10 k 100 k 1 M 100 10 nF 22 nF 47 nF 100 nF fOSC -- Frequency -- Hz 470 pF 1nF 2.2 nF 4.7 nF TIMING RESISTANCE vs FREQUENCY Figure 10. DEAD TIME vs FREQUENCY 160 140 120 100 80 10 k 100 k 1 M CT =1nF fOSC -- Frequency -- Hz CT = 470 pF |
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