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UC1838A Scheda tecnica(PDF) 1 Page - Texas Instruments |
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UC1838A Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 5 page UC1838A UC2838A UC3838A Magnetic Amplifier Controller FEATURES • Independent 1% Reference • Two Uncommitted, Identical Operational Amplifiers • 100mA Reset Current Source with –120V Capability • 5V to 40V Analog Operation • 5W DIL Package 10 VCC VREF 9 2.5V REFERENCE INV. IN 8 E/A OUT 3 INV. IN 6 7 N.I. IN 2 1 N.I. IN C/L OUT C/L E/A 3.5V 15 DR 1 16 DR 2 RESET 14 VM 11 5 12 13 4 GND GND GND GND 20 1k 5k BLOCK DIAGRAM 04/99 UDG-97174 DESCRIPTION The UC1838A family of magnetic amplifier controllers contains the circuitry to gen- erate and amplify a low-level analog error signal along with a high volt- age-compliant current source. This source will provide the reset current necessary to enable a magnetic amplifier to regulate and control a power supply output in the range of 2A to 20A. By controlling the reset current to a magnetic amplifier, this device will define the amount of volt-seconds the magnetic amplifier will block before switching to the conducting state. Magnetic amplifiers are ideal for post-regulators for multi- ple-output power supplies where each output can be independently controlled with efficiencies up to 99%. With a square or pulse-width-modulated input voltage, a magnetic amplifier will block a portion of this input waveform, allowing just enough to pass to provide a regulated output. With the UC1838A, only the magnetic ampli- fier coil, three diodes, and an output L-C filter are necessary to implement a com- plete closed-loop regulator. The UC1838A contains a precision 2.5V reference, two uncommitted high-gain op amps and a high-gain PNP-equivalent current source which can deliver up to 100mA of magnetic amplifier reset current and with –120 volt capability. These devices are available in a plastic “bat-wing” DIP for operation over a –20°C to +85°C temperature range and, with reduced power, in a hermetically sealed cerdip for –55°C to +125°C operation. Surface mount versions are also available. This improved “A” version replaced the non “A” version formerly introduced. |
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