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UC284XA Datasheet(PDF) 5 Page - STMicroelectronics |
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UC284XA Datasheet(HTML) 5 Page - STMicroelectronics |
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5/16 UC384XA - UC284XA Figure 4. Open Loop Test Circuit. High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin 5 in a single point ground. The transistor and 5 K Ω potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3. RT A 2N2222 4.7K Ω 1K Ω ERROR AMP. ADJUST 4.7K Ω 5K Ω ISENSE ADJUST 100K Ω COMP VFB ISENSE RT/CT 1 2 3 4 CT 7 6 5 8 VREF Vi OUTPUT GROUND 0.1 µF 0.1 µF VREF Vi OUTPUT GROUND 1W 1K Ω D95IN343 Figure 5. Oscillator Frequency vs Timing Resistance Figure 6. Maximum Duty Cycle vs Timing Resistor Figure 7. Oscillator Discharge Current vs. Temperature. Figure 8. Error Amp Open-Loop Gain and Phase vs. Frequency. 300 1K 3K 10K 30K RT(Ω) 1K 10K 100K 1M fo (Hz) D96IN362 CT=470pF 1nF 2.2nF 4.7nF 300 1K 3K 10K 30K RT(Ω) 0 20 40 60 fo (Hz) D96IN363 80 -55 -25 0 25 50 75 100 TA(˚C) 7.0 7.5 8.0 8.5 Idischg (mA) D95IN335 Vi=15V VOSC=2V 10 100 1K 10K 100K 1M f(Hz) -20 0 20 40 60 80 (dB) 180 150 120 90 60 30 φ D95IN337 Vi=15V VO=2V to 4V RL=100K TA=25˚C Gain Phase |
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