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LM2931AZ-5.0RPG Datasheet(PDF) 8 Page - ON Semiconductor |
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LM2931AZ-5.0RPG Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 23 page LM2931, NCV2931 Series http://onsemi.com 8 VO, OUTPUT VOLTAGE (V) 1.160 1.180 1.200 1.220 1.240 0 3.0 6.0 9.0 12 15 18 21 24 18.5 14 t, TIME (10 ms/DIV) Vout = 5.0 V RL = 500 W CO = 100 mF CO(ESR) = 0.3 W TA = 25°C 100 0 t, TIME (10 ms/DIV) VO, OUTPUT VOLTAGE (V) 2.0 2.1 2.2 0 3.0 6.0 9.0 12 15 18 21 24 Output On" Output Off" 2.4 2.5 2.6 2.3 LM2931C Adjustable IO = 10 mA Vin = Vout + 1.0 V TA = 25°C Vin = 14 V Vout = 5.0 V Cin = 1000 mF CO = 100 mF CO(ESR) = 0.3 W TA = 25°C LM2931C Adjustable IO = 10 mA Vin = Vout + 1.0 V TA = 25°C Figure 13. Line Regulation Figure 14. Load Regulation Figure 15. Reference Voltage versus Output Voltage Figure 16. Output Inhibit−Thresholds versus Output Voltage APPLICATIONS INFORMATION The LM2931 series regulators are designed with many protection features making them essentially blow−out proof. These features include internal current limiting, thermal shutdown, overvoltage and reverse polarity input protection, and the capability to withstand temporary power−up with mirror−image insertion. Typical application circuits for the fixed and adjustable output device are shown in Figures 17 and 18. The input bypass capacitor Cin is recommended if the regulator is located an appreciable distance ( ≥ 4″) from the supply input filter. This will reduce the circuit’s sensitivity to the input line impedance at high frequencies. This regulator series is not internally compensated and thus requires an external output capacitor for stability. The capacitance value required is dependent upon the load current, output voltage for the adjustable regulator, and the type of capacitor selected. The least stable condition is encountered at maximum load current and minimum output voltage. Figure 22 shows that for operation in the “Stable” region, under the conditions specified, the magnitude of the output capacitor impedance |ZO| must not exceed 0.4 W. This limit must be observed over the entire operating temperature range of the regulator circuit. With economical electrolytic capacitors, cold temperature operation can pose a serious stability problem. As the electrolyte freezes, around − 30 °C, the capacitance will decrease and the equivalent series resistance (ESR) will increase drastically, causing the circuit to oscillate. Quality electrolytic capacitors with extended temperature ranges of −40 ° to +85°C and −55° to +105°C are readily available. Solid tantalum capacitors may be a better choice if small size is a requirement, however, the maximum ⏐ZO⏐ limit over temperature must be observed. Note that in the stable region, the output noise voltage is linearly proportional to ⏐ZO⏐. In effect, CO dictates the high frequency roll−off point of the circuit. Operation in the area titled “Marginally Stable” will cause the output of the regulator to exhibit random bursts of oscillation that decay in an under−damped fashion. Continuous oscillation occurs when operating in the area titled “Unstable”. It is suggested that oven testing of the entire circuit be performed with maximum load, minimum input voltage, and minimum ambient temperature. |
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