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UCC2800MDREP Datasheet(PDF) 9 Page - Texas Instruments |
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UCC2800MDREP Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page UCC2800/2801/2802/2803/2804/2805-EP LOW-POWER BICMOS CURRENT-MODE PWM SGLS135F − SEPTEMBER 2002 − REVISED OCTOBER 2010 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION Figure 1 Oscillator The UCC3800/1/2/3/4/5 oscillator generates a sawtooth waveform on RC. The rise time is set by the time constant of RT and CT. The fall time is set by CT and an internal transistor on-resistance of approximately 125. During the fall time, the output is off and the maximum duty cycle is reduced below 50% or 100% depending on the part number. Larger timing capacitors increase the discharge time and reduce the maximum duty cycle and frequency. Figure 2 Error Amplifier Gain/Phase Response Figure 3 UCC1803/05 VREF vs VCC; ILOAD = 0.5 mA Figure 4 UCC1800/01/02/04 Oscillator Frequency vs RT and CT |
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