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LM20EP bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI) |
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LM20EP bảng dữ liệu(HTML) 6 Page - National Semiconductor (TI) |
6 / 9 page Mounting (Continued) Capacitive Loads The LM20EP handles capacitive loading well. Without any precautions, the LM20EP can drive any capacitive load less than 300 pF as shown in Figure 4. Over the specified tem- perature range the LM20EP has a maximum output imped- ance of 160 Ω. In an extremely noisy environment it may be necessary to add some filtering to minimize noise pickup. It is recommended that 0.1 µF be added from V + to GND to bypass the power supply voltage, as shown in Figure 5.Ina noisy environment it may even be necessary to add a ca- pacitor from the output to ground with a series resistor as shown in Figure 5. A 1 µF output capacitor with the 160 Ω maximum output impedance and a 200 Ω series resistor will form a 442 Hz lowpass filter. Since the thermal time constant of the LM20EP is much slower, the overall response time of the LM20EP will not be significantly affected. SC70-5 SC70-5 no heat sink small heat sink θ JA T J −TA θ JA T J −TA (˚C/W) (˚C) (˚C/W) (˚C) Still air 412 0.2 350 0.19 SC70-5 SC70-5 no heat sink small heat sink θ JA T J −TA θ JA T J −TA (˚C/W) (˚C) (˚C/W) (˚C) Moving air 312 0.17 266 0.15 See Figure 1 for PCB layout samples. micro SMD micro SMD no heat sink small heat fin θ JA T J −TA θ JA T J −TA (˚C/W) (˚C) (˚C/W) (˚C) Still air 340 0.18 TBD TBD micro SMD micro SMD no heat sink small heat fin θ JA T J −TA θ JA T J −TA (˚C/W) (˚C) (˚C/W) (˚C) Moving air TBD TBD TBD TBD FIGURE 3. Temperature Rise of LM20EP Due to Self-Heating and Thermal Resistance ( θ JA) 20099915 FIGURE 4. LM20EP No Decoupling Required for Capacitive Loads Less than 300 pF. R( Ω) C (µF) 200 1 470 0.1 680 0.01 1 k 0.001 20099916 20099933 FIGURE 5. LM20EP with Filter for Noisy Environment and Capacitive Loading greater than 300 pF. Either placement of resistor as shown above is just as effective. www.national.com 6 |
Số phần tương tự - LM20EP |
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Mô tả tương tự - LM20EP |
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