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UC2838 Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza UC2838
Descripción Electrónicos  MAGNETIC AMPLIFIER CONTROLLER
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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UC2838 Datasheet(HTML) 1 Page - Texas Instruments

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UC2838, UC2838A
UC3838, UC3838A
SLUS221A – APRIL 2000 – REVISED MAY 2001
MAGNETIC AMPLIFIER
CONTROLLER
UDG-97174
10
VCC
VREF
9
2.5 V
REFERENCE
INV. IN
8
E/A OUT
3
INV. IN
6
7
N.I. IN
2
1
N.I. IN
C/L OUT
C/L
E/A
3.5 V
15 DR 1
16 DR 2
RESET
14
VM
11
5
12
13
4
GND GND GND GND
+
+
20 Ω
1 kΩ
5 kΩ
1
www.ti.com
FEATURES
D Independent 1% Reference
D Two Uncommitted, Identical Operational
Amplifiers
D 100-mA Reset Current Source With –120-V
Capability
D 5-V to 40-V Analog Operation
D 5-W DIP Package
BLOCK DIAGRAM
DESCRIPTION
The UC3838 and the UC3838A 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 provides the reset current
necessary to enable a magnetic amplifier to
regulate and control a power supply output in the
range of 2 A to 20 A.
The UC3838A originally was a parametric
improvement version of the UC3838 which since
has been used for both versions. There is no
difference between the UC3838A and UC3838
version.
By controlling the reset current to a magnetic
amplifier, this device defines the amount of
volt-seconds the magnetic amplifier blocks 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
blocks a portion of this input waveform, allowing
just enough to pass to provide a regulated output.
With the UC3838/A, only the magnetic amplifier
coil, three diodes, and an output L-C filter are
necessary to implement a complete closed-loop
regulator.
AVAILABLE OPTIONS
Packaged Devices
TA = TJ
SOIC Wide
(DW)
PDIP (N)
PLCC (Q)
20
°Cto85°C
UC2838DW
UC2838N
UC2838Q
–20
°C to 85°C
UC2838ADW
UC2838AN
UC2838AQ
0
°Cto70°C
UC3838DW
UC3838N
UC3838Q
0
°C to 70°C
UC3838ADW
UC3838AN
UC3838AQ
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.


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