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LM323AT Datasheet(PDF) 3 Page - ON Semiconductor |
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LM323AT Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 8 page LM323, A 3 MOTOROLA ANALOG IC DEVICE DATA 1.0k Q2 Q1 Q20 210 Q21 100 Q22 6.7V 16k Q9 Q8 300 Q3 10k Q4 Q5 Q10 1.0k Q24 200 Q25 Q27 Q26 3.0k 5.6k Q16 Q19 10pF Q23 300 13 0.12 200 Output 50 520 Q12 2.6k 2.0k 3.9k Q13 Q14 6.0k Q11 Q6 Q7 40pF Q15 2.8k 7.2k 840 1.7k Gnd Input 2 1.0k 6.0k Representative Schematic Diagram Q17 Q18 VOLTAGE REGULATOR PERFORMANCE The performance of a voltage regulator is specified by its immunity to changes in load, input voltage, power dissipation, and temperature. Line and load regulation are tested with a pulse of short duration (< 100 µs) and are strictly a function of electrical gain. However, pulse widths of longer duration (> 1.0 ms) are sufficient to affect temperature gradients across the die. These temperature gradients can cause a change in the output voltage, in addition to changes by line and load regulation. Longer pulse widths and thermal gradients make it desirable to specify thermal regulation. Thermal regulation is defined as the change in output voltage caused by a change in dissipated power for a specified time, and is expressed as a percentage output voltage change per watt. The change in dissipated power can be caused by a change in either input voltage or the load current. Thermal regulation is a function of IC layout and die attach techniques, and usually occurs within 10 ms of a change in power dissipation. After 10 ms, additional changes in the output voltage are due to the temperature coefficient of the device. Figure 1 shows the line and thermal regulation response of a typical LM323A to a 20 W input pulse. The variation of the output voltage due to line regulation is labeled À and the thermal regulation component is labeled Á. Figure 2 shows the load and thermal regulation response of a typical LM323A to a 20 W load pulse. The output voltage variation due to load regulation is labeled À and the thermal regulation component is labeled Á. 2 1 2 1 Figure 1. Line and Thermal Regulation Figure 2. Load and Thermal Regulation Vout = 5.0 V Vin = 8.0 V → 18 V → 8.0 V Iout = 2.0 A = Regline = 2.4 mV t, TIME (2.0 ms/DIV) 1 2 18 V 8.0 V 2 Vout = 5.0 V Vin = 15 V Iout = 0 A → 2.0 A → 0 A = Regline = 5.4 mV t, TIME (2.0 ms/DIV) 1 2 2.0 0 = Regtherm = 0.0015% VO/W = Regtherm = 0.0015% VO/W 2 |
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