Texas Instruments UC1838AL883B, UC1838AL, UC1838AJ883B, UC1838AJ Datasheet
UC1838A
UC2838A
UC3838A
Magnetic Amplifier Controller
FEATURES
• Independent 1% Reference
• Two Uncommitted, Identical
Operational Amplifiers
• 100mA Reset Current Source
with –120V Capability
• 5V to 40V Analog Operation
• 5W DIL Package
10VCC
VREF
9
2.5V
REFERENCE
INV. IN
8E/A OUT
3INV. IN
6
7N.I. IN
2
1
N.I. IN
C/L OUT
C/L
E/A
3.5V
15 DR 1
16 DR 2
RESET
14
VM11
5 12 134
GND GND GND GND
201k5k
BLOCK DIAGRAM
04/99
UDG-97174
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.
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.
2
UC1838A
UC2838A
UC3838A
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, VM-V
R
. . . . . . . . . . . . . . . . . .
–140V
Amplifier Input Range . . . . . . . . . . . . . . . . . . . . . . –0.3V to V
CC
Reset Input Current, I
DR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–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
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.
DR 216
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
DR 1
Reset
Gnd
Gnd
V
M
V
CC
V
REF
C/L Out
C/L N.I. In
C/L INV. In
Gnd
Gnd
E/A Inv.In
E/A N.I. In
E/A Out
CONNECTION DIAGRAMS
DIL-16, SOIC-16 (TOP VIEW)
J or N Package, DP Package
3
18
17
16
N/C
122019
15
14
4
5
6
7
8
91110 12 13
C/L Out
C/L N.I. In
DR2
DR1
Reset
N/C
N/C
GND
V
M
C/L Inv. In
GND
N/C
N/C
E/A Inv. In
V
CC
V
REF
N/C
E/A N.I. In
E/A Out
PLCC-20, LCC-20 (TOP VIEW)
Q, L Packages
Note: All four ground pins must be connected to a common
ground
TEMPERATURE RANGE PACKAGE
UC1838AJ –55°C to +125°C Ceramic Dip
UC1838AL CLCC
UC2838ADP –20°C to +85°C Power SOIC
UC2838AN Plastic Dip
UC2838AQ PLCC
UC3838ADP 0°C to +70°C Power SOIC
UC3838AN Plastic Dip
UC3838AQ PLCC
ORDERING INFORMATION
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