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CA3130AM Scheda tecnica(PDF) 12 Page - Intersil Corporation |
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CA3130AM Scheda tecnica(HTML) 12 Page - Intersil Corporation |
12 / 17 page 12 Error-Amplifier in Regulated-Power Supplies The CA3130 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 zero. Figure 13 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 lC2 (a CA3086 transistor-array lC) function as zeners to provide supply-voltage for the CA3130 comparator (IC1). Q1, Q2, and Q5 in IC2 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 14 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 CA3130 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 15. Resistors R1 and R2 are used to bias the CA3130 to the mid-point 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 16 contains a schematic diagram of a function generator using the CA3130 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. FIGURE 14. VOLTAGE REGULATOR CIRCUIT (0.1V TO 50V AT 1A) 6 2 3 1 8 7 4 4.3k Ω 1 Ω + - 43k Ω 100 µF ERROR AMPLIFIER IC1 VOLTAGE ADJUST 14 13 100 µF +55V INPUT 2.2k Ω + - IC2 CA3086 10, 11 Q4 Q1 Q2 6 REGULATION (NO LOAD TO FULL LOAD): <0.005% INPUT REGULATION: 0.01%/V HUM AND NOISE OUTPUT: <250 µVRMS UP TO 100kHz + - + - CA3130 + - + - 1W 3.3k Ω 1W 5 µF 9 8, 7 Q3 1, 2 3 5 4 1k Ω 62k Ω Q5 12 10k Ω Q2 Q1 50k Ω Q3 1k Ω 2N3055 2N2102 CURRENT LIMIT ADJUST 2N5294 2N2102 Q4 1000pF 10k Ω 8.2k Ω OUTPUT: 0.1 TO 50V AT 1A CA3130, CA3130A |
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