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UC28025DW Datasheet(PDF) 9 Page - Texas Instruments |
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UC28025DW Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page UC28023 UC28025 SLUS557B − MARCH 2003 − REVISED APRIL 2004 9 www.ti.com APPLICATION INFORMATION Figure 3. Open Loop Frequency Response 100 0 −40 1 k 10 k 100 k 1 M 10 M 100 M −20 60 20 40 80 100 −180 −90 0 GAIN AND PHASE vs FREQUENCY fOSC − Frequency − Hz GAIN PHASE 3 2 5 4 1 0 0.2 0.4 0.6 0.8 1.0 tdelay − Delay Time− µs Figure 4. Unity Gain Slew Rate VOLTAGE vs TIME VOUT VIN CONTROL METHODS 6 7 CT UC2802x OSCILLATOR 1.25 V RAMP From Error Amplifier Figure 5. Voltage Mode Control UDG−03050 CT Figure 6. Peak Current Mode Control RSENSE UDG−03050 CT * A small filter may be required to supress switch noise. 6 7 CT UC2802x OSCILLATOR 1.25 V RAMP From Error Amplifier * * ISENSE |
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