UC2838N [TI]
MAGNETIC AMPLIFIER CONTROLLER; 磁放大控制器
| 型号： | UC2838N |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | MAGNETIC AMPLIFIER CONTROLLER |
| 文件： | 总11页 (文件大小：343K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ꢀꢁꢂ ꢃ ꢄ ꢃ ꢅ ꢀ ꢁꢂ ꢃꢄ ꢃꢆ
ꢀꢁꢄ ꢃ ꢄ ꢃ ꢅ ꢀ ꢁꢄ ꢃꢄ ꢃꢆ
SLUS221A – APRIL 2000 – REVISED MAY 2001
ꢇ ꢆꢈ ꢉꢊꢋ ꢌꢁ ꢆꢇ ꢍꢎ ꢌꢏ ꢌꢊ ꢐ
ꢁꢑ ꢉꢋ ꢐꢑ ꢎ ꢎꢊ ꢐ
FEATURES
DESCRIPTION
D
Independent 1% Reference
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.
D
Two Uncommitted, Identical Operational
Amplifiers
D
100-mA Reset Current Source With –120-V
Capability
D
5-V to 40-V Analog Operation
5-W DIP Package
D
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.
BLOCK DIAGRAM
VCC 10
11 VM
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.
2.5 V
REFERENCE
VREF
9
Ω
Ω
Ω
20
5 k
1 k
3.5 V
INV. IN
6
–
E/A
+
N.I. IN
E/A OUT
INV. IN
7
8
3
14 RESET
15 DR 1
16 DR 2
–
C/L
+
N.I. IN
2
1
C/L OUT
4
5
12
13
GND GND GND GND
UDG-97174
AVAILABLE OPTIONS
Packaged Devices
T
A
= T
J
SOIC Wide
(DW)
PDIP (N)
PLCC (Q)
UC2838DW
UC2838ADW
UC3838DW
UC3838ADW
UC2838N
UC2838AN
UC3838N
UC3838AN
UC2838Q
UC2838AQ
UC3838Q
UC3838AQ
–20°C to 85°C
0°C to 70°C
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1
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SLUS221A – APRIL 2000 – REVISED MAY 2001
description (continued)
The UC3838/A contains a precision 2.5-V reference, two uncommitted high-gain operational amplifier and a
high-gain PNP-equivalent current source which can deliver up to 100 mA of magnetic amplifier reset current
and with –120-V capability.
These devices are available in a plastic batwing DIP (N), wide body SOIC (DW), and PLCC (Q) package for
operation over a –20°C to 85°C temperature range.
Q PACKAGE
(TOP VIEW)
DW AND N PACKAGES
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
C/L OUT
C/L N.I. IN
C/L INV. IN
GND
DR2
DR1
RESET
GND
GND
VM
VCC
VREF
3
2
1
20 19
C/L INV.IN
GND
RESET
N/C
4
5
6
7
8
18
17
16
15
14
GND
E/A INV. IN
E/A N.I. IN
E/A OUT
N/C
N/C
N/C
GND
VM
E/A INV.IN
9
10 11 12 13
†
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V
CC
Magnetic amplifier source voltage, VM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V
Reset output voltage, VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –120 V
Total current source voltage, VM – VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –140 V
Amplifier input range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to VCC
Reset input current, DR1 and DR2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10 mA
Power dissipation at T = 25°C
A
Q, N, DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 W
Power dissipation at T (leads/case) = 25°C
Q, N, DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 W
Operating temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C
J
Storage temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
Lead temperature (soldering, 10 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C
†
‡
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltages are with respect to ground pins. All currents are positive into the specified terminal. Consult packaging section of data book for thermal
limitations and considerations of package.
2
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SLUS221A – APRIL 2000 – REVISED MAY 2001
electrical characteristics, T = –20°C to 85°C for the UC2838/A, and T = 0°C to 70°C for the
A
A
UC3838/A, V
= 20 V, VM = 5 V, T = T , (unless otherwise stated)
CC
A J
reference
UC2838/UC2838A
UC3838/UC3838A
PARAMETER
Supply current
TEST CONDITIONS
UNITS
MIN
TYP
4
MAX
8
MIN
TYP
4
MAX
8
V
= V = 40 V
M
mA
V
CC
Reference output
Line regulation
T
A
= 25°C
2.47
2.50
1
2.53
5
2.45
2.50
1
2.55
10
V
= 5 V to 30 V
mV
mV
mA
mV
CC
Load regulation
I
O
= 0 mA to –2 mA
5
20
5
20
Short-circuit current
Temperature stability
VREF = 0 V
See Note 1
–30
15
–60
25
–30
10
–60
25
NOTE: 1.These parameters are ensured by design but not 100% tested in production.
amplifier (each amplifier)
UC2838/UC2838A
UC3838/UC3838A
PARAMETER
Offset voltage
TEST CONDITIONS
= 2.5 V
UNITS
MIN
TYP
MAX
5
MIN
TYP
MAX
10
V
V
mV
µA
nA
V
CM
Input bias current
= 0 V
–1
–1
IN
Input offset voltage
Minimum output swing
Output sink current
Output source current
100
18
100
18
0.4
1
0.4
1
V
O
V
O
V
O
= 5 V
10
–10
120
30
10
–10
120
30
mA
mA
dB
= 0 V
–1
–20
–1
–20
A
VOL
(open loop gain)
= 1 V to 11 V
100
100
C
(common mode rejection ra-
MRR
tio)
V
IN
= 1 V to 11 V
70
80
70
80
dB
P
(power supply rejection ratio)
V
= 10 V to 20 V
70
100
0.8
70
100
0.8
dB
SRR
CC
Gain bandwidth
See Note 1
0.6
0.6
MHz
NOTE: 1.These parameters are ensured by design but not 100% tested in production.
reset drive
UC2838/UC2838A
UC3838/UC3838A
PARAMETER
Input leakage
TEST CONDITIONS
UNITS
MIN
TYP
MAX
10
MIN
TYP
MAX
10
V
= 40 V
DR
VR = –120 V
µA
µA
Output leakage
–100
–2
–100
–2
Input current
I
I
I
= –50 mA
–1
–120
0.042
–1
–120
0.042
mA
mA
A/V
R
Maximum reset current
Transconductance
= –3 mA
–100
–200
0.055
–100
–200
0.055
DR
= –10 mA to –50 mA
0.03
0.03
R
3
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SLUS221A – APRIL 2000 – REVISED MAY 2001
typical application
45 TURNS
50B10–1D CORE
100 µH
UES2403
0.02 Ω
100 Ω
+V
O
MAGNETIC
AMPLIFIER
UES1003
UES2403
Ω
300
1 W
100 Ω
0.1
15 k
+
Ω
14
9.1 kΩ
3
2
12 V
SECONDARY
WINDING
15
1
0.47
+
4.7 k
Ω
12 k
Ω
20Ω
1000
15 V
AUXILLIARY
SUPPLY
6
7
+
11
10
16
8
3.6 k
Ω
2 k
Ω
2.5 V
9
REF
UC3838/A
2.4 k
Ω
4, 5, 12, 13
GND
NOTE: 12 V, 4 A output with switching frequency = 50 kHz.
APPLICATION INFORMATION
GAIN MAGNITUDE
vs
GAIN MAGNITUDE/PHASE
vs
SIGNAL FREQUENCY
SIGNAL FREQUENCY
–120
–100
–80
–60
–40
–20
0
140
120
180
225
270
315
T
= 125 C
J
100
80
60
40
20
0
Phase
T
= 25 C
J
Gain
360
V
IN
V
O
2.5 V
+
T
= –55 C
J
V
O
Gain = 20 Log
V
IN
0.1
1.0
10
100
1 k
10 k 0.1 M 1 M
0
–0.2 –0.4
–0.6 –0.8
–1.0
–1.2 –1.4
Signal Frequency – Hz
Input Current – mA
Figure 1.
Figure 2.
4
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ꢀꢁꢄ ꢃ ꢄ ꢃ ꢅ ꢀ ꢁꢄ ꢃꢄ ꢃꢆ
SLUS221A – APRIL 2000 – REVISED MAY 2001
APPLICATION INFORMATION
RESET CURRENT
vs
GAIN MAGNITUDE/PHASE
vs
RESET VOLTAGE
SIGNAL FREQUENCY
–120
–100
–80
–60
–40
–20
0
5
C
= 25
T
J
PHASE
GAIN
0
180
225
270
315
I
= 1.2 mA
B
–5
–10
–15
–20
–25
–30
I
= 1.0 mA
B
I
= 0.8 mA
B
5 V
I
= 0.6 mA
= 0.4 mA
B
V
V
O
360
GAIN = 20 LOG
V
IN
IN
V
O
RI = 10
I
I (dc) = 50 mA
O
B
I (ac) = 10 mA
O
1 k
10 k
100 k
1 M
10 M
0
–20
–40
–60
–80
–100
Signal Frequency – Hz
Reset Voltage – V
Figure 3.
Figure 4.
REFERENCE VOLTAGE OUTPUT
vs
RESET CURRENT
vs
JUNCTION TEMPERATURE
INPUT CURRENT
–120
–100
–80
V
= 5 V
M
2.55
V
IN
2.54
2.53
2.52
2.51
2.50
I
R
–60
2.49
2.48
= –55 C
T
J
T
= 125 C
–40
J
2.47
2.46
T
J
= 25 C
–20
2.45
0
0
–1
–2
–3
–4
–5
–6
–50
0
50
100
°C
150
Input Voltage – V
Junction Temperature –
Figure 5.
Figure 6.
5
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PACKAGE OPTION ADDENDUM
www.ti.com
21-Mar-2013
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package Qty
Eco Plan Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
Top-Side Markings
Samples
Drawing
(1)
(2)
(3)
(4)
UC2838AJ
UC2838AN
NRND
CDIP
PDIP
PDIP
PLCC
PLCC
SOIC
J
N
16
16
16
20
20
16
TBD
TBD
TBD
TBD
TBD
TBD
Call TI
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-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
0 to 70
OBSOLETE
OBSOLETE
NRND
UC2838AN
UC2838ANG4
UC2838AQ
N
FN
FN
DW
UC2838AQTR
UC3838ADW
OBSOLETE
OBSOLETE
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) Only one of markings shown within the brackets will appear on the physical device.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
21-Mar-2013
OTHER QUALIFIED VERSIONS OF UC3838A :
Military: UC1838A
•
NOTE: Qualified Version Definitions:
Military - QML certified for Military and Defense Applications
•
Addendum-Page 2
MECHANICAL DATA
MPLC004A – OCTOBER 1994
FN (S-PQCC-J**)
PLASTIC J-LEADED CHIP CARRIER
20 PIN SHOWN
Seating Plane
0.004 (0,10)
0.180 (4,57) MAX
0.120 (3,05)
D
0.090 (2,29)
D1
0.020 (0,51) MIN
3
1
19
0.032 (0,81)
0.026 (0,66)
4
18
D2/E2
D2/E2
E
E1
8
14
0.021 (0,53)
0.013 (0,33)
0.050 (1,27)
9
13
0.007 (0,18)
M
0.008 (0,20) NOM
D/E
D1/E1
D2/E2
NO. OF
PINS
**
MIN
0.385 (9,78)
MAX
MIN
MAX
MIN
MAX
0.395 (10,03)
0.350 (8,89)
0.356 (9,04)
0.141 (3,58)
0.191 (4,85)
0.291 (7,39)
0.341 (8,66)
0.169 (4,29)
0.219 (5,56)
0.319 (8,10)
0.369 (9,37)
20
28
44
52
68
84
0.485 (12,32) 0.495 (12,57) 0.450 (11,43) 0.456 (11,58)
0.685 (17,40) 0.695 (17,65) 0.650 (16,51) 0.656 (16,66)
0.785 (19,94) 0.795 (20,19) 0.750 (19,05) 0.756 (19,20)
0.985 (25,02) 0.995 (25,27) 0.950 (24,13) 0.958 (24,33) 0.441 (11,20) 0.469 (11,91)
1.185 (30,10) 1.195 (30,35) 1.150 (29,21) 1.158 (29,41) 0.541 (13,74) 0.569 (14,45)
4040005/B 03/95
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-018
1
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