Datenblatt-Suchmaschine für elektronische Bauteile |
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UC3838A Datenblatt(PDF) 1 Page - Texas Instruments |
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UC3838A Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 12 page UC2838, UC2838A UC3838, UC3838A SLUS221A – APRIL 2000 – REVISED MAY 2001 MAGNETIC AMPLIFIER CONTROLLER UDG-97174 10 VCC VREF 9 2.5 V 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 3.5 V 15 DR 1 16 DR 2 RESET 14 VM 11 5 12 13 4 GND GND GND GND + – + – 20 Ω 1 kΩ 5 kΩ 1 www.ti.com FEATURES D Independent 1% Reference D Two Uncommitted, Identical Operational Amplifiers D 100-mA Reset Current Source With –120-V Capability D 5-V to 40-V Analog Operation D 5-W DIP Package BLOCK DIAGRAM DESCRIPTION The UC3838 and the UC3838A family of magnetic amplifier controllers contains the circuitry to generate and amplify a low-level analog error signal along with a high voltage-compliant current source. This source provides the reset current necessary to enable a magnetic amplifier to regulate and control a power supply output in the range of 2 A to 20 A. The UC3838A originally was a parametric improvement version of the UC3838 which since has been used for both versions. There is no difference between the UC3838A and UC3838 version. By controlling the reset current to a magnetic amplifier, this device defines the amount of volt-seconds the magnetic amplifier blocks before switching to the conducting state. Magnetic amplifiers are ideal for post-regulators for multiple-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 blocks a portion of this input waveform, allowing just enough to pass to provide a regulated output. With the UC3838/A, only the magnetic amplifier coil, three diodes, and an output L-C filter are necessary to implement a complete closed-loop regulator. AVAILABLE OPTIONS Packaged Devices TA = TJ SOIC Wide (DW) PDIP (N) PLCC (Q) 20 °Cto85°C UC2838DW UC2838N UC2838Q –20 °C to 85°C UC2838ADW UC2838AN UC2838AQ 0 °Cto70°C UC3838DW UC3838N UC3838Q 0 °C to 70°C UC3838ADW UC3838AN UC3838AQ PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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