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UC3842BD1 Datasheet(PDF) 6 Page - STMicroelectronics |
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UC3842BD1 Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 15 page 
-55 -25 0 25 50 75 100 TA(˚C) 7.0 7.5 8.0 8.5 Idischg (mA) D95IN335 Vi=15V VOSC=2V Figure 4: Oscillator Discharge Current vs. Tem- perature. 12 3 5 40 50 60 70 80 90 Dmax (%) 0.8 RT(KΩ) D95IN336 Vi=15V CT=3.3nF TA=25˚C Idischg=7.5mA Idischg=8.8mA Figure 5: Maximum Output Duty Cycle vs. Tim- ing Resistor. 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 Figure 6: Error Amp Open-Loop Gain and Phase vs. Frequency. 0246 VO(V) 0.0 0.2 0.4 0.6 0.8 1.0 Vth (V) D95IN338 Vi=15V TA=-40˚C TA=125˚C TA=25˚C Figure 7: Current Sense Input Threshold vs. Er- ror Amp Output Voltage. 0 20406080 100 Iref(mA) D95IN339 0 10 20 30 40 50 60 Vi=15V TA=-40˚C TA=125˚C Figure 8: Reference Voltage Change vs. Source Current. -55 -25 0 25 50 75 100 TA(˚C) D95IN340 50 60 70 80 90 100 ISC (mA) Vi=15V RL≤0.1Ω Figure 9: Reference Short Circuit Current vs. Temperature. UC2842B/3B/4B/5B - UC3842B/3B/4B/5B 6/15 |
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