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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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LM363 Scheda tecnica(PDF) 12 Page - National Semiconductor (TI) |
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LM363 Scheda tecnica(HTML) 12 Page - National Semiconductor (TI) |
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12 / 22 page  Application Hints (Continued) COMPENSATION AND OUTPUT CLAMPING The LM363 is internally compensated for unity feedback from output to sense Increasing gain with external dividers will decrease the bandwidth and increase stability margin Without external compensation the amplifier can stably drive capacitive loads up to 400 pF When used as an op amp (sense and reference pins grounded feedback to in- verting input) the LM363 is stable for gains of 100 or more For greater stability the device may be over-compensated as in Figure 6 Tables I and II depict suggested compensa- tion components along with the resulting changes in large and small signal bandwidth for the 8-pin and 16-pin pack- ages respectively Note that the RC network from pin 8 of the 8-pin device to ground has a large effect on power bandwidth especially at low gains The Miller capacitance utilized for overcompen- sating the 16-pin device permits higher slew rate and larger load capacitance for the same bandwidth and is preferred when bandwidth must be greatly reduced (eg to reduce output noise) Heavy Miller overcompensation on the 16-pin package can degrade AC PSRR A large capacitor between pins 15 and 16 couples transients on the positive supply to the output buffer Since the amplifier bandwidth is severely rolled off it cannot keep the output at the correct state at moderate frequencies Hence for good PSRR either keep the Miller capacitance under 1000 pF or use the pin 15-to-ground compensation shown in Table I TLH5609 – 14 FIGURE 6 Overcompensation TABLE I Overcompensation on 8-Pin Package Small Signal Power Maximum Compensation Network 3 dB Bandwidth Capacitive Gain (Pin 8 to Ground) Bandwidth (g10V Swing) Load (kHz) (Hz) (pF) 125 100k 400 100 pF 15k 95 15k 600 500 1000 pF 5k 45 18k 800 001 mF500X 10 200 1000 01 mF 1 20 1000 240 100k 400 100 pF 15k 170 15k 900 100 1000 pF 5k 80 18k 1200 001 mF 500X 20 200 1600 01 mF 2 20 2000 240 100k 400 100 pF 15k 170 15k 900 10 1000 pF 5k 90 18k 1200 001 mF 500X 20 200 1600 01 mF 2 20 2000 Also stable for CL t 005 mF Pin 15 to ground on 16-pin package TABLE II Overcompensation on 16-Pin Package Compensation Small Signal Power Maximum Gain Capacitor 3 dB Bandwidth Capacitive (Pin 15 to 16) Bandwidth (g10V Swing) Load (Hz) (Hz) (pF) 45k 45k 1000 10 pF 16k 16k 2000 1000 100 pF 25k 25k 2500 1000 pF 250 250 3000 001 mF 25 25 3000 140k 100k 900 10 pF 50k 50k 1600 100 100 pF 75k 75k 2000 1000 pF 750 750 2000 001 mF 75 75 2000 180k 90k 600 10 pF 60k 50k 1100 10 100 pF 9k 9k 1600 1000 pF 900 900 2000 001 mF 90 90 2000 Also stable for CL t 005 mF 12 |
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