UC1838AJ [TI]

Magnetic Amplifier Controller 16-CDIP -55 to 125;


型号：	UC1838AJ
厂家：	TEXAS INSTRUMENTS
描述：	Magnetic Amplifier Controller 16-CDIP -55 to 125 CD
文件：	总5页 (文件大小：270K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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

UC1838A

UC2838A

UC3838A

CONNECTION DIAGRAMS

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V_CC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V

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

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

Total Current Source Voltage, V_M- V_R. . . . . . . . . . . . . . . . . . –140V

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

Reset Input Current, I_DR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10mA

Power Dissipation at T_A= 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

DIL-16, SOIC-16 (TOP VIEW)

J or N Package, DP Package

C/L Out

C/L N.I. In

C/L INV. In

Gnd

16 DR 2

15 DR 1

14 Reset

13 Gnd

12 Gnd

Gnd

E/A Inv. In

E/A N.I. In

E/A Out

Note: All voltages are with respect to ground pins. All currents

are positive into the specified terminal. Consult Packaging

section of Databook for thermal limitations and considerations

of package.

REF

Note: All four ground pins must be connected to a common

ground

ORDERING INFORMATION

TEMPERATURE RANGE

PACKAGE

Ceramic Dip

CLCC

UC1838AJ

UC1838AL

UC2838ADP

UC2838AN

UC2838AQ

UC3838ADP

UC3838AN

UC3838AQ

–55°C to +125°C

PLCC-20, LCC-20 (TOP VIEW)

Q, L Packages

–20°C to +85°C

0°C to +70°C

Power SOIC

Plastic Dip

PLCC

N/C

C/L Out

DR2

DR1

C/L N.I. In

Power SOIC

Plastic Dip

PLCC

20 19

C/L Inv. In

GND

Reset

N/C

GND

V_M

E/A Inv. In

10 11 12 13

E/A N.I. In

E/A Out

V_CC

V_REF

N/C

UC1838A

UC2838A

UC3838A

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for T_A= –55°C to +125°C for the

UC1838A, –20°C to +85°C for the UC2838A, and 0°C to +70°C for the UC3838A, V_CC= 20V, V_M= 5V, T_A= T_J.

UC1838A / UC2838A

UC3838A

TYP

UNITS

PARAMETER

Reference Section

TEST CONDITIONS

MIN

TYP

MAX

MIN

MAX

Supply Current

Reference Output

Line Regulation

_CC= V_M= 40V

2.5

2.53

2.5

2.55

T_A= 25°C

2.47

2.45

V_CC= 5 to 30V

I_O= 0 to –2mA

V_REF= 0V

Load Regulation

Short Circuit Current

Temperature Stability*

Amplifier Section (Each Amplifier)

Offset Voltage

–30

–60

–30

–60

Over Operating Temp. Range

V_CM= 2.5V

V_IN= 0V

–1

µA

Input Bias Current

Input Offset Current

Minimum Output Swing

Output Sink Current

Output Source Current

A_VOL

–1

100

0.4

V_O= 5V

–10

120

–10

120

V_O= 0V

–1

100

0.6

–20

–1

100

0.6

–20

V_O= 1 to 11V

V_IN= 1 to 11V

V_CC= 10 to 20V

C_MRR

P_SRR

100

0.8

100

0.8

Gain Bandwidth*

Reset Drive Section

Input Leakage

MHz

V_DR= 40V

–100

–2

–100

–2

µA

Output Leakage

Input Current

V_R= –120V

I_R= –50mA

–1

A/V

Maximum Reset Current

Transconductance

I_DR= –3mA

–100 –120 –200 –100 –120 –200

.03 .042 .055 .03 .042 .055

I_R= –10 to –50mA

* These parameters are guaranteed by design but not 100% tested in production.

TYPICAL APPLICATION

+12V, 4A output with switching frequency = 50 kHz.

UC1838A

UC2838A

UC3838A

APPLICATION INFORMATION

Figure 1. Amplifier open loop response.

Figure 4. Reset driver response.

Figure 2. Reset driver-input current.

Figure 5. Reset driver-input voltage.

Figure 3. Reset driver-output impedance.

Figure 6. Reference temperature coefficient.

UNITRODE CORPORATION

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

TEL. (603) 424-2410 • FAX (603) 424-3460

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.

UC1838AJ [TI]

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