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UCC1800J883B Datasheet(PDF) 6 Page - Texas Instruments |
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UCC1800J883B Datasheet(HTML) 6 Page - Texas Instruments |
6 / 20 page 6 UCC1800/1/2/3/4/5 UCC2800/1/2/3/4/5 UCC3800/1/2/3/4/5 Figure 1. Oscillator. Figure 2. Error amplifier gain/phase response. 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 tran- sistor on-resistance of approximately 125 . During the fall time, the output is off and the maximum duty cycle is re- duced below 50% or 100% depending on the part number. Larger timing capacitors increase the discharge time and re- duce the maximum duty cycle and frequency. 4.00 3.98 3.96 3.94 3.92 3.90 3.88 3.86 3.84 3.82 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 5.8 6 V (V) CC Figure 3. UCC1803/5 VREF vs. VCC;ILOAD = 0.5mA. 1000 100 10 10 100 1000 R(k) T 100pF 200pF 330pF 1nF Figure 4. UCC1800/1/2/4 oscillator frequency vs. RT and CT. |
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