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LM27 Folha de dados(PDF) 7 Page - Texas Instruments |
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LM27 Folha de dados(HTML) 7 Page - Texas Instruments |
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7 / 17 page  LM27 V+ VTEMP GND HYST OS/OS/US/ US CLOAD R 0.12f Heavy Capacitive Load, Cable/Wiring LM27 V+ VTEMP GND HYST OS/OS/US/ US CLOAD R Heavy Capacitive Load, Cable/Wiring 0.12F LM27 www.ti.com SNIS124D – AUGUST 2002 – REVISED JULY 2013 5. (a) Gradually raise VTEMP until OS goes HIGH. Note VTEMP. (b) Calculate THYST using Equation 3. VTEMP LOADING The VTEMP output has very weak drive capability (1 µA source, 40 µA sink). So care should be taken when attaching circuitry to this pin. Capacitive loading may cause the VTEMP output to oscillate. Simply adding a resistor in series as shown in Figure 6 will prevent oscillations from occurring. To determine the value of the resistor follow the guidelines given in Table 3. The same value resistor will work for either placement of the resistor. If an additional capacitive load is placed directly on the LM27 output, rather than across CLOAD, it should be at least a factor of 10 smaller than CLOAD. Table 3. Resistive compensation for capacitive loading of VTEMP CLOAD R ( Ω) ≤100pF 0 1nF 8200 10nF 3000 100nF 1000 ≥1µF 430 Resistor placement for capacitive loading compensation of VTEMP Figure 5. R in series with capacitor Figure 6. R in series with signal path NOISE CONSIDERATIONS The LM27 has excellent power supply noise rejection. Listed below is a variety of signals used to test the LM27 power supply rejection. False triggering of the output was not observed when these signals where coupled into the V+ pin of the LM27. • square wave 400kHz, 1Vp-p • square wave 2kHz, 200mVp-p • sine wave 100Hz to 1MHz, 200mVp-p Testing was done while maintaining the temperature of the LM27 one degree centigrade way from the trip point with the output not activated. Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM27 |
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