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AZ3842P Datasheet(PDF) 7 Page - Advanced Analog Technology, Inc. |
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AZ3842P Datasheet(HTML) 7 Page - Advanced Analog Technology, Inc. |
7 / 13 page CURRENT MODE PWM CONTROLLER AZ3842/3/4/5 Advanced Analog Circuits Data Sheet 7 March 2003 Rev: 1.0 Electrical Characteristics (Continued) Figure 4 is the basic test circuit for AZ384x. In testing, the 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 5k potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3. Figure 7. Reference Voltage vs. Ambient Temperature Figure 8. Start-up Current vs. Ambient Temperature Typical Performance Characteristics Figure 5. Oscillator Dead Time vs. Timing Capacitor Figure 6. Timing Resistor vs. Frequency -40 -20 0 20406080 100 120 0.4 0.5 0.6 0.7 0.8 0.9 1.0 AZ3842 Ambient Temperature ( oC) 110 100 1 10 0.3 30 3 47 22 4.7 2.2 Timing Capacitor (nF) 100 1k 10k 100k 1M 10k 100k 5K 50K Frequency (Hz) -40 -20 0 20 40 60 80 100 120 4.980 4.985 4.990 4.995 5.000 5.005 5.010 5.015 V CC=15V, IO=1mA Ambient Temperature ( oC) |
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