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LM2931CTH Scheda tecnica(PDF) 8 Page - Motorola, Inc |
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LM2931CTH Scheda tecnica(HTML) 8 Page - Motorola, Inc |
8 / 16 page LM2931 Series 8 MOTOROLA ANALOG IC DEVICE DATA 0.1 1.0 0.01 Figure 17. Fixed Output Regulator Figure 18. Adjustable Output Regulator Figure 19. (5.0 A) Low Differential Voltage Regulator Figure 20. Current Boost Regulator with Short Circuit Projection Figure 21. Constant Intensity Lamp Flasher Figure 22. Output Noise Voltage versus Output Capacitor Impedance |ZO|, MAGNITUDE OF CAPACITOR IMPEDANCE (mΩ) 10 100 1.0 k 10 k Vin Input Output Vout CO IB Gnd Cin 0.1 LM2931–5.0 Fixed Output Switch Position 1 = Output “On”, 2 = Output “Off” LM2931C Adjustable Output Vin Cin 0.1 Vout CO Output Input 51 k 1 2 Output Inhibit Adjust Gnd IAdj R1 R2 IB The LM2931 series can be current boosted with a PNP transistor. The D45VH7, on a heatsink, will provide an output current of 5.0 A with an input to output voltage differential of approximately 1.0 V. Resistor R in conjunction with the VBE of the PNP determines when the pass transistor begins conducting. This circuit is not short circuit proof. Input ≥ 6.0 V D45VH7 5.0 V @ 5.0 A Output 100 + 100 + 68 LM2931–5.0 The circuit of Figure 19 can be modified to provide supply protection against short circuits by adding the current sense resistor RSCandanadditionalPNP transistor. The current sensing PNP must be capable of handling the short circuit current of the LM2931. Safe operating area of both transistors must be considered under worst case conditions. Input R RSC Output LM2931–5.0 100 100 ++ LM2931C Input 6.4 V to 30 V 2.0 k 8.2 k 100 + CM #345 100 + 33 k 6.2 V fosc = 2.2 Hz 0 10 100 Vin = 5.6 V Vout = 5.0 V IO = 100 mA Vnrms 10 Hz to 10 MHz |ZO| @ 40 kHz TA = 25°C 22.5 k w R 1 R 2 R 1 ) R 2 Vout + Vref 1 ) R 2 R 1 ) I Adj R 2 R Unstable Marginally Stable Stable |
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