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CA5130E bảng dữ liệu(PDF) 11 Page - Intersil Corporation |
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CA5130E bảng dữ liệu(HTML) 11 Page - Intersil Corporation |
11 / 19 page 11 Peak Detectors Peak detector circuits are easily implemented with the CA5130, as illustrated in Figure 7 for both the peak positive and the peak negative circuit. It should be noted that with large signal inputs, the bandwidth of the peak negative circuit is much less than that of the peak positive circuit. The second stage of the CA5130 limits the bandwidth in this case. Negative going output signal excursion requires a positive going signal excursion at the collector of transistor Q11, which is loaded by the intrinsic capacitance of the associated circuitry in this mode. On the other hand, during a negative going signal excursion at the collector of Q11, the transistor functions in active “pull down” mode so that the intrinsic capacitance can be discharged more expeditiously. Error Amplifier In Regulated Power Supplies The CA5130 is an ideal choice for error amplifier service in regulated power supplies since it can function as an error amplifier when the regulated output voltage is required to approach 0V. Figure 8 shows the schematic diagram of a 40mA power supply capable of providing regulated output voltage by continuous adjustment over the range from 0V to 13V. Q3 and Q4 in IC2 (a CA3066 transistor array lC) function as zeners to provide supply voltage for the CA5130 comparator (lC1). Q1,Q2, and Q5 in lC2 are configured as a low impedance, temperature compensated source of adjustable reference voltage for the error amplifier. Transistors Q1, Q2, Q3, and Q4 in lC3 (another CA3086 transistor array lC) are connected in parallel as the series pass element. Transistor Q5 in lC3 functions as a current limiting device by diverting base drive from the series pass transistors, in accordance with the adjustment of resistor R2. Figure 9 contains the schematic diagram of a regulated power supply capable of providing regulated output voltage by continuous adjustment over the range from 0.1V to 50V and currents up to 1A. The error amplifier (lC1) and circuitry associated with lC2 function as previously described, although the output of lC1 is boosted by a discrete transistor (Q4) to provide adequate base drive for the Darlington connected series pass transistors Q1, Q2. Transistor Q3 functions in the previously described current limiting circuit. Multivibrators The exceptionally high input resistance presented by the CA5130 is an attractive feature for multivibrator circuit design because it permits the use of timing circuits with high R/C ratios. The circuit diagram of a pulse generator (astable multivibrator), with provisions for independent control of the “on” and “off” periods, is shown in Figure 10. Resistors R1 and R2 are used to bias the CA5130 to the midpoint of the supply voltage and R3 is the feedback resistor. The pulse repetition rate is selected by positioning S1 to the desired position and the rate remains essentially constant when the resistors which determine “on period” and “off period” are adjusted. Function Generator Figure 11 contains a schematic diagram of a function generator using the CA5130 in the integrator and threshold detector functions. This circuit generates a triangular or square wave output that can be swept over a 1,000,000:1 range (0.1Hz to 100kHz) by means of a single control, R1.A voltage control input is also available for remote sweep control. The heart of the frequency determining system is an operational transconductance amplifier (OTA) (see Note 9), lC1, operated as a voltage controlled current source. The output, IO, is a current applied directly to the integrating capacitor, C1, in the feedback loop of the integrator lC2, using a CA5130, to provide the triangular wave output. Potentiometer R2 is used to adjust the circuit for slope symmetry of positive going and negative going signal excursions. Another CA5130, lC3, is used as a controlled switch to set the excursion limits of the triangular output from the integrator circuit. Capacitor C2 is a “peaking adjustment” to optimize the high frequency square wave performance of the circuit. Potentiometer R3 is adjustable to perfect the “amplitude symmetry” of the square wave output signals. Output from the threshold detector is fed back via resistor R4 to the input of lC1 so as to toggle the current source from plus to minus in generating the linear triangular wave. Operation with Output Stage Power-Booster The current sourcing and sinking capability of the CA5130 output stage is easily supplemented to provide power boost capability. In the circuit of Figure 12, three CMOS transistor pairs in a single CA3600E (see Note 10) lC array are shown parallel connected with the output stage in the CA5130. In the Class A mode of CA3600E shown, a typical device consumes 20mA of supply current at 15V operation. This arrangement boosts the current handling capability of the CA5130 output stage by about 2.5X. The amplifier circuit in Figure 12 employs feedback to establish a closed-loop gain of 48dB. The typical large signal bandwidth (-3dB) is 50kHz. NOTES: 9. See File No. 475 and AN6668. 10. See File No. 619 for technical information. CA5130, CA5130A |
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Mô tả tương tự - CA5130E |
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