Magnetic Amplifier Controller

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VCC . . . . . . . . . . . 40V

Magnetic Amp. Source Voltage, VM . . . . . . . . . . . . . . 40V

Reset Output Voltage, VR . . . . . . . . . . . . . . . . . . . . –120V

Total Current Source Voltage, VM - VR . . . . . . . . . . –140V

Amplifier Input Range . . . . . . . . . . . . . .. –0.3V to VCC

Reset Input Current, IDR . . . . . . . . . . . . . . . . . . . . . . . . . –10mA Power Dissipation at TA = 25°C

Q, N, DP Package . . . . . . 2W

J, L Package. . . . . . . . .. . 1W

Power Dissipation at T (leads/case) = 25°C

Q, N, DP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5W

J, L Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2W Operating Temperature Range. . . . . . . . . . . . –55°C to +125°C Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . 300°C

DESCRIPTION

The UC1838A 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 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 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 will block a portion of this input waveform, allowing just enough to pass to provide a regulated output. With the UC1838A, only the magnetic amplifier coil, three diodes, and an output L-C filter are necessary to implement a complete 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.

TYPICAL APPLICATION

STOCK LIST

CHONGMING GROUP (HK) INT'L CO., LTD. located in Hong Kong and Shenzhen. We are an independent Distributor of Electronic Components,established in 2008. AS a growing fast company, CM GROUP is renowned for its world-class efficiency, excellent services, and extraordinary ability to supply electronic components that are hard to find and even obsolete. We have taken pride in our innovation, reliability and service, especially in the semiconductor marketplace.
Our distribution brands include XILINX，ALTERA，ATMEL, INFINEON, ST,SAMSUNG，TEXAS INSTRUMENTS，ON，TOSHIBA，，MICROCHIP，CYPRESS，FREESCALE，etc. We distributes over 200,000 products ranging from semiconductors to resistors, capacitors, diodes, inductors, connectors, transistors, sensors and so on.
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