UC2838A Datasheet PDF - Unitrode
| Part Number | UC2838A | |
| Description | Magnetic Amplifier Controller | |
| Manufacturers | Unitrode | |
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Magnetic Amplifier Controller
UC1838A
UC2838A
UC3838A
FEATURES
• Independent 1% Reference
• Two Uncommitted, Identical
Operational Amplifiers
• 100mA Reset Current Source
with –120V Capability
• 5V to 40V Analog Operation
• 5W DIL Package
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.
BLOCK DIAGRAM
VCC 10
VREF 9
2.5V
REFERENCE
INV. IN 6
N.I. IN 7
E/A OUT 8
INV. IN 3
N.I. IN 2
C/L OUT 1
E/A
C/L
04/99
11 VM
5k 1k 20
3.5V
4 5 12 13
GND GND GND GND
14 RESET
15 DR 1
16 DR 2
UDG-97174
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IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright © 1999, Texas Instruments Incorporated
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| Information | Total 5 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ UC2838A.PDF Datasheet ] | |
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