Datenblatt-Suchmaschine für elektronische Bauteile |
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LM12CL Datenblatt(PDF) 7 Page - National Semiconductor (TI) |
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LM12CL Datenblatt(HTML) 7 Page - National Semiconductor (TI) |
7 / 14 page Application Information (Continued) PARALLEL OPERATION Output drive beyond the capability of one power amplifier can be provided as shown here. The power op amps are wired as followers and connected in parallel with the outputs coupled through equalization resistors. A standard, high-voltage op amp is used to provide voltage gain. Overall feedback compensates for the voltage dropped across the equalization resistors. With parallel operation, there may be an increase in un- loaded supply current related to the offset voltage across the equalization resistors. More output buffers, with individual equalization resistors, may be added to meet even higher drive requirements. This connection allows increased output capability without requiring a separate control amplifier. The output buffer, A 2, provides load current through R 5 equal to that supplied by the main amplifier, A 1, through R4. Again, more output buff- ers can be added. Current sharing among paralleled amplifiers can be affected by gain error as the power-bandwidth limit is approached. In the first circuit, the operating current increase will depend upon the matching of high-frequency characteristics. In the second circuit, however, the entire input error of A 2 appears across R 4 and R5. The supply current increase can cause power limiting to be activated as the slew limit is ap- proached. This will not damage the LM12. It can be avoided in both cases by connecting A 1 as an inverting amplifier and restricting bandwidth with C 1. SINGLE-SUPPLY OPERATION Although op amps are usually operated from dual supplies, single-supply operation is practical. This bridge amplifier supplies bi-directional current drive to a servo motor while operating from a single positive supply. The output is easily converted to voltage drive by shorting R 6 and connecting R7 to the output of A 2, rather than A1. Either input may be grounded, with bi-directional drive pro- vided to the other. It is also possible to connect one input to a positive reference, with the input signal varying about this voltage. If the reference voltage is above 5V, R 2 and R3 are not required. HIGH VOLTAGE AMPLIFIERS The voltage swing delivered to the load can be doubled by using the bridge connection shown here. Output clamping to the supplies can be provided by using a bridge-rectifier as- sembly. DS008704-12 DS008704-13 DS008704-14 DS008704-15 www.national.com 7 |
Ähnliche Teilenummer - LM12CL |
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Ähnliche Beschreibung - LM12CL |
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