UC2838QTR [TI]
IC,MAGNETIC AMPLIFIER CONTROLLER,BIPOLAR,LDCC,20PIN;
| 型号： | UC2838QTR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | IC,MAGNETIC AMPLIFIER CONTROLLER,BIPOLAR,LDCC,20PIN 放大器 |
| 文件： | 总6页 (文件大小：187K) |
| 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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ꢚ ꢞ ꢛ ꢚꢓ ꢔꢨ ꢖꢕ ꢙ ꢡꢡ ꢟꢙ ꢗ ꢙ ꢘ ꢞ ꢚ ꢞ ꢗ ꢛ ꢣ
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1
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ꢀ ꢁꢂꢃ ꢄꢃ ꢅ ꢀ ꢁ ꢂꢃ ꢄꢃ ꢆ
ꢀ ꢁꢄꢃ ꢄꢃ ꢅ ꢀ ꢁ ꢄꢃ ꢄꢃ ꢆ
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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ꢀꢁꢂ ꢃ ꢄ ꢃ ꢅ ꢀ ꢁꢂ ꢃꢄ ꢃꢆ
ꢀꢁꢄ ꢃ ꢄ ꢃ ꢅ ꢀ ꢁꢄ ꢃꢄ ꢃꢆ
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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ꢀ ꢁꢂꢃ ꢄꢃ ꢅ ꢀ ꢁ ꢂꢃ ꢄꢃ ꢆ
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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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ꢀꢁꢂ ꢃ ꢄ ꢃ ꢅ ꢀ ꢁꢂ ꢃꢄ ꢃꢆ
ꢀꢁ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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