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LM2419 bảng dữ liệu(PDF) 4 Page - National Semiconductor (TI) |
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LM2419 bảng dữ liệu(HTML) 4 Page - National Semiconductor (TI) |
4 / 8 page Application Hints (Continued) TLH11442 – 8 FIGURE 3 Typical Application Circuit (One Channel) IMPROVING RISE AND FALL TIMES Because of an emitter follower output stage the rise and fall times of the LM2419 are relatively unaffected by capacitive loading However the series resistors R1 and R2 (see Fig- ure 3 ) will reduce the rise and fall times when driving the CRT’s cathode which appears as a capacitive load The ca- pacitance at the cathode typically ranges from 8 pF to 12 pF To improve the rise and fall times at the cathode a small inductor is often used in series with the output of the amplifi- er The inductor L1 in Figure 3 peaks the amplifier’s fre- quency response at the cathode thus improving rise and fall times The inductor value is empirically determined and is dependent on the load An inductor value of 01 mHisa good starting value Note that peaking the amplifier’s fre- quency response will increase the overshoot REDUCING OVERSHOOT LM2419’s overshoot is a function of both the input signal rise and fall times and the capacitive loading The overshoot is increased by either more capacitive loading or faster rise and fall times of the input signal Table I shows the overshoot for a typical device with differ- ent capacitive loads and different input signal rise and fall times As can be observed from Table I overshoot is large for large capacitive loads and faster input signal rise and fall times In an actual application the LM2419 is driven from a preamplifier with rise and fall times of 3 ns to 7 ns When driven from LM1203 preamplifier (see application circuit Figure 6 ) the overshoot is 10% with 12 pF capacitive load The overshoot can be reduced by including a resistor in series with LM2419’s output as in Figure 3 Larger value resistors for R1 and R2 would reduce overshoot but this also increases the rise and fall times at the output Frequen- cy peaking using an inductor in series with the output may restore the bandwidth Table I LM2419 Output Overshoot vs Capacitive Loading for a Typical Device Input Signal CL tr tf 5 pF 8 pF 11 pF 15 pF 12 ns 4% 6% 7% 8% 7ns 4% 5% 6% 7% GAIN VS OUTPUT DC LEVEL Figure 4 shows LM2419’s gain versus output DC level A 100 mVPP AC signal is applied at the LM2419’s input and the input signal’s DC level is swept As can be seen from Figure 4 the amplifier’s gain is constant at approximately 154 (VOUT e 154 VPP) for output DC level between 35V and 65V Thus the amplifier’s output response is linear for output voltage between 35V and 65V If the output voltage is less than 35V or more than 70V the amplifier’s output response becomes non-linear (note the change in gain Fig- ure 4 ) For optimum performance it is recommended that LM2419’s output low voltage be at 25V or above For a 50 VPP swing the output high voltage is 75V With an output signal swing from 25V to 75V LM2419’s linearity error is measured at 8% TLH11442 – 9 FIGURE 4 Gain vs VOUT (DC) VIN e 100 mVPP 4 |
Số phần tương tự - LM2419 |
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Mô tả tương tự - LM2419 |
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