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UCC2804QDRQ1 Datasheet(PDF) 8 Page - Texas Instruments |
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UCC2804QDRQ1 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 14 page UCC2800/2801/2802/2803/2804/2805Q1 LOW POWER BICMOS CURRENT MODE PWM SGLS121B − JULY 2002 − REVISED 2004 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION Figure 1 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. 0.2 V 2.5 V REF RC RT Oscillator RQ S CT 8 4 Figure 2 Error Amplifier Gain/Phase Response Figure 3 UCC1803/05 VREF vs VCC IL = 0.5 mA Figure 4 UCC1800/01/02/04 Oscillator Frequency vs RT and CT |
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