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LM324 Folha de dados(PDF) 11 Page - Cadeka Microcircuits LLC. |
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LM324 Folha de dados(HTML) 11 Page - Cadeka Microcircuits LLC. |
11 / 15 page Data Sheet ©2011 CADEKA Microcircuits LLC www.cadeka.com 11 (VLOAD)RMS = VPEAK / √2 ( ILOAD)RMS = ( VLOAD)RMS / Rloadeff The dynamic power is focused primarily within the output stage driving the load. This value can be calculated as: PDYNAMIC = (VS+ - VLOAD)RMS × ( ILOAD)RMS Assuming the load is referenced in the middle of the pow- er rails or Vsupply/2. Figure 4 shows the maximum safe power dissipation in the package vs. the ambient temperature for the pack- ages available. 0 0.5 1 1.5 2 2.5 -40 -20 0 20 40 60 80 Ambient Temperature (°C) SOT23-6 SOT23-5 SOIC-16 Figure 4. Maximum Power Derating Driving Capacitive Loads Increased phase delay at the output due to capacitive load- ing can cause ringing, peaking in the frequency response, and possible unstable behavior. Use a series resistance, RS, between the amplifier and the load to help improve stability and settling performance. Refer to Figure 5. + - Rf Input Output Rg Rs CL RL Figure 5. Addition of RS for Driving Capacitive Loads Table 1 provides the recommended RS for various capaci- tive loads. The recommended RS values result in <=1dB peaking in the frequency response. The Frequency Re- sponse vs. CL plot, on page 6, illustrates the response of the LM358/LM324. CL (pF) RS (Ω) -3dB BW (kHz) 1nF 0 485 5nF 0 390 10nF 0 260 100 0 440 Table 1: Recommended RS vs. CL For a given load capacitance, adjust RS to optimize the tradeoff between settling time and bandwidth. In general, reducing RS will increase bandwidth at the expense of ad- ditional overshoot and ringing. Overdrive Recovery An overdrive condition is defined as the point when either one of the inputs or the output exceed their specified volt- age range. Overdrive recovery is the time needed for the amplifier to return to its normal or linear operating point. The recovery time varies, based on whether the input or output is overdriven and by how much the range is ex- ceeded. The LM358/LM324 will typically recover in less than 30ns from an overdrive condition. Figure 6 shows the LM358 in an overdriven condition. Figure 6. Overdrive Recovery -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 0 20 40 60 80 100 Time (us) Output Input VIN = 1.25Vpp G = 5 |
Nº de peça semelhante - LM324 |
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Descrição semelhante - LM324 |
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