Datasheet > UC1838A

UC1838A

更新时间： 2024-11-03 22:34:51

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
5页	272K
描述
Magnetic Amplifier Controller

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中文翻译

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数据手册

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UC1838A 数据手册

UC1838A

UC2838A

UC3838A

Magnetic Amplifier Controller

FEATURES

DESCRIPTION

• Independent 1% Reference

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.

• Two Uncommitted, Identical

Operational Amplifiers

• 100mA Reset Current Source

with –120V Capability

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.

• 5V to 40V Analog Operation

• 5W DIL Package

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

2.5V

REFERENCE

VREF

11 VM

INV. IN

3.5V

E/A

N.I. IN

E/A OUT

INV. IN

14 RESET

15 DR 1

16 DR 2

C/L

N.I. IN

C/L OUT

GND GND GND GND

UDG-97174

04/99

12 3 4 5

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