722MG [BB]
DUAL ISOLATED DC/DC CONVERTER; 双隔离DC / DC转换器
| 型号： | 722MG |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | DUAL ISOLATED DC/DC CONVERTER |
| 文件： | 总10页 (文件大小：157K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
722
SBVS016A - SEPTEMBER 1978 – REVISED JANUARY 2003
DUAL ISOLATED DC/DC CONVERTER
DESCRIPTION
FEATURES
ꢀ DUAL ISOLATED ±5V TO ±16V OUTPUTS
The 722 converts a single 5VDC to 16VDC input into a pair of
bipolar output voltages of the same value as the input
voltage. The converter is capable of providing a total output
current of 64mA at rated voltage accuracy and up to 200mA
without damage.
ꢀ HIGH BREAKDOWN VOLTAGE: 8000V Test
ꢀ LOW LEAKAGE CURRENT:
< 1µA at 240V/60Hz
The two output channels are isolated from the input and from
each other. They may be connected independently, in series
for higher output voltage or in parallel for higher output
current, as a single channel isolated DC/DC converter.
ꢀ LOW COST PER ISOLATED CHANNEL
ꢀ SMALL SIZE: 27.9mm x 27.9mm x 7.6mm
(1.1" x 1.1" x 0.3")
Integrated circuit construction of the 722 reduces size and
cost. High isolation breakdown voltages and low leakage
currents are assured by special design and construction that
includes use of a high dielectric strength, low leakage coating
used on the internal assembly.
APPLICATIONS
ꢀ MEDICAL EQUIPMENT
A self-contained 900kHz oscillator drives switching circuitry,
which is designed to eliminate the common problem of input
current spiking due to transformer saturation or crossover
switching.
ꢀ INDUSTRIAL PROCESS CONTROL
ꢀ TEST EQUIPMENT
ꢀ DATA ACQUISITION SYSTEMS
ꢀ NUCLEAR INSTRUMENTATION
1
2
3
+VO1
C1
P+
V+
11
20
Rectifiers
and
Filters
–VO1
Oscillator
and
Switch
Drivers
E
18
16
10 +VO2
Rectifiers
and
Filters
C2
9
8
–VO2
V–
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2003, Texas Instruments Incorporated
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE(2)
PACKAGE
DESIGNATOR(1)
PACKAGE
MARKING
ORDERING
NUMBER
TRANSPORT
MEDIA, QUANTITY
PRODUCT
PACKAGE-LEAD
722
DIP-20
DIP-20
DIP-20
JND
JND
JND
–25°C to +85°C
–25°C to +85°C
–25°C to +85°C
722
722G
722BG
722MG
Rails, 17
Rails, 17
Rails, 17
722BG
722MG
722BG
722MG
NOTES: (1) For the most current specifications, and package information, refer to our web site at www.ti.com. (2) –25°C to +60°C for 16mA ≤ ILOAD ≤ 40mA per
output.
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
Supply Voltage, V+ to V– ..................................................................... 16V
DISCHARGE SENSITIVITY
Input Current ................................................................................... 275mA
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
Operating Temperature .................................................... –25°C to +80°C
Storage Temperature ...................................................... –55°C to +125°C
Junction Temperature ..................................................... –55°C to +125°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those specified is not implied.
ESD damage can range from subtle performance degradation
tocompletedevicefailure. Precisionintegratedcircuitsmaybe
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
722
2
SBVS016A
www.ti.com
ELECTRICAL CHARACTERISTICS
At TA = +25°C, VIN = 15VDC, C = 0.47µF, and R1 selected per typical characteristic, unless otherwise noted.
722
722BG
TYP
722MG
TYP
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
MAX MIN
MAX
UNITS
INPUT
Rated Input Voltage
Input Voltage Range(1)
Input Current
15
ꢀ
ꢀ
VDC
VDC
mA
5
16
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Total Output Current = 12mA
Total Output Current = 64mA
Total Output Current = 64mA
at TA = +85°C
Total Output Current = 160mA
Total Output Current = 12mA
Total Output Current = 64mA
Total Output Current = 160mA
50
105
ꢀ
ꢀ
ꢀ
ꢀ
120
mA
120
—
3
6
—
ꢀ
225
ꢀ
ꢀ
12
ꢀ
—
ꢀ
ꢀ
—
mA
mA
mA, pk
mA, pk
mA, pk
—
275
—
Input Ripple(2)
ISOLATION
Test Voltages
Input-to-Output, 5 seconds, min
Input-to-Output, 1 minute, min
Channel-to-Channel, 5 seconds, min
Input-to-Output, continuous
Channel-to-Channel, continuous
Input-to-Output
8000
—
5000
3500
2000
ꢀ
—
ꢀ
ꢀ
ꢀ
ꢀ
2500
ꢀ
ꢀ
ꢀ
Vpk
Vrms
Vpk
V
Rated Voltages
ꢀ
V
Isolation Impedance
Leakage Current(3)
10 || 6
ꢀ
ꢀ
GΩ || pF
µA
Input-to-Output, 240V, 60Hz
1
ꢀ
ꢀ
OUTPUT
Rated Output Voltages(4)
ILOAD = 3mA per Output
15.4
14.3
—
16.2
16.2
—
200
100
ꢀ
ꢀ
13.0
ꢀ
ꢀ
16.2
ꢀ
ꢀ
ꢀ
—
ꢀ
ꢀ
—
ꢀ
ꢀ
VDC
VDC
VDC
mA
I
I
LOAD = 16mA per Output
LOAD = 40mA per Output
Total of All Outputs
—
14.2
—
Output Current
Any One Output(5)
3
ꢀ
ꢀ
ꢀ
mA
(5)
Load Regulation
Ripple Voltage
ꢀ
ꢀ
ꢀ
50
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ILOAD = 3mA per Output
15
35
—
mVpk
mVpk
mVpk
mVDC
I
I
LOAD = 16mA per Output
LOAD = 40mA per Output
Balanced Loads
100
ꢀ
ꢀ
Tracking Error between
Dual Outputs
±200
Sensitivity to Input
Voltage Changes
Output Voltage Temperature
Coefficient
1.13
±0.02
ꢀ
ꢀ
ꢀ
ꢀ
V/V
%/°C
T
A = TSPECIFICATION RANGE
TEMPERATURE
Specification
I
LOAD ≤ 16mA per Output
–25
–25
–55
+85
+60
+125
+125
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
°C
°C
°C
°C
ILOAD ≤ 40mA per Output
Storage
Junction Temperature
ꢀ Specifications same as 722.
NOTES: (1) For ambient temperature above +70°C, the input voltage is 12.5V (max). The input voltage remains 16V (max) if case temperature is kept below +85°C.
(2) External capacitor across P+ to V– pins and 12" of #24 wire to VIN. (3) Reference UL544, paragraph 27.5, Leakage Current. (4) See Typical Characteristics.
(5) A minimum output current of 3mA at each output is recommended to maintain output voltage accuracy.
722
SBVS016A
3
www.ti.com
TYPICAL CHARACTERISTICS
At TA = +25°C, VIN = 15VDC, C = 0.47µF, and R1 selected per typical characteristic, unless otherwise noted.
SELECTION OF R1 OR EXTERNAL VOLTAGE V+
FOR MINIMUM INTERNAL POWER DISSIPATION
MAXIMUM SAFE OPERATING TEMPERATURE
vs TOTAL OUTPUT CURRENT
125
100
75
125
100
75
MAXIMUM OUTPUT CURRENT
FROM ANY SINGLE OUTPUT
16mA to
Case
<16mA
30mA
30mA
>13
11 to
13
9 to
11
1.3kΩ
820Ω
510Ω
820Ω
510Ω
510Ω
200Ω
200Ω
0Ω
Ambient
Input
Voltage
(V)
50
50
8 to
9
200Ω
0Ω
0Ω
—
—
—
25
0
25
0
<8
V+EXT
6.5V
7.5V
9.0V
0
50
100
150
200
Total Output Current(2) (mA)
SINGLE-CHANNEL LOAD REGULATION
OUTPUT VOLTAGE vs INPUT VOLTAGE
Total Output Current = 12mA
16
15
14
13
18
13
8
IL
+
+
IF = 3mA
IF = 16mA
IF
VO
–
+
V
V
–
+
IL
IF
VO
Total Output Current = 64mA
–
–
Total Output Current = 200mA
IF = 50mA
3
4
8
12
16
0
20
40
Output Load Current |IL| (mA)
60
80
100
Input Voltage (V)
SINGLE OUTPUT LOAD REGULATION
CHANNEL-TO-CHANNEL INTERACTION
IF = 3mA
16
15
14
13
16
15
14
13
IL
+
+
IF = 3mA
IF = 16mA
IF
VO
–
V
–
+
+
IF = 16mA
IF
IF
VO VO
–
–
IL
+
+
IF = 50mA
IF
VN
VN
V
V
IF = 50mA
–
+
–
+
IF
IF
–
–
0
20
40
Output Load Current |IL| (mA)
60
80
0
100
20
40
Output Load Current |IL| (mA)
60
80
100
NOTES: (1) Using a 104mm x 19mm x 1.6mm aluminum strip mounted to the bottom of the case with heat sink compound. (2) Total output current is the sum of the
currents for each individual output.
722
4
SBVS016A
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VIN = 15VDC, C = 0.47µF, and R1 selected per typical characteristic, unless otherwise noted.
PARALLEL OUTPUT UNBALANCED
LOAD REGULATION
PARALLEL OUTPUT BALANCED
LOAD REGULATION
16
15
14
13
16
15
14
13
IL
V
V
IF = 6mA
IF
VO
VO
IF = 100mA
IL
V
V
V
V
IL
IF = 32mA
0
40
80
120
0
160
20
200
40
60
80
100
Output Load Current |IL| (mA)
Output Load Current |IL| (mA)
OUTPUT-TO-OUTPUT INTERACTION
16
15
14
IL
V
V
I
F = 6mA
IF
VN
VN
IF = 32mA
IF = 100mA
13
0
40
80
120
160
200
Output Load Current |IL| (mA)
722
SBVS016A
5
www.ti.com
INSTALLATION AND
DISCUSSION
OPERATING INSTRUCTIONS
OUTPUT CURRENT RATINGS
At rated output voltage accuracy, the 722 is capable of
providing 64mA divided among its four outputs(1). A minimum
average output current of 3mA is recommended at each
output to maintain voltage accuracy.
Typical application connections for the 722 are shown in
Figures 1 and 2. Primary power (VIN) is applied at the P+ and
V– terminals. The common or ground for VIN may be con-
nected to either P+ or V–; the only requirement is that P+ and
V+ must be positive with respects to V–.
Output channels(2) can be connected in series or parallel for
higher output voltage or current.
Power for the internal oscillator and switch drivers is derived
from the primary power by a voltage dropping resistor, R1.
The value of R1 as a function of VIN is shown in the Typical
Characteristics section. Alternately, voltage for the V+ termi-
nal can be obtained from a separate source. V+ should be
+5V to +7.5V positive with respect to V–. If a separate source
is used, the V+ input must be applied before the P+ input in
order to avoid possible damage to the unit. P+ and V+ must
remain positive with respect to V– at all times (including
transients). If necessary, diode clamps should be attached
across these inputs.
ISOLATION CONFIGURATIONS
The fact that the two outputs of the 722 are isolated from the
input and from each other allows both two-port and three-port
isolation connections.
Figure 1 shows TI’s 3650 optically coupled isolation amplifier
connected in three-port configuration. One of the 722 chan-
nels provides power to the 3650 input. The other channel
supplies power to the 3650 output. The amplifier input and
output are isolated from each other and the system power
supply common. In this configuration, the 722 channel-to-
channel isolation specification applies to the amplifier input-
to-output voltage.
The E pin enables the converter when connected to V+ and
disables it when connected to V–.
An external capacitor, C (0.47µF ceramic), is used to reduce
input ripple. It should be connected as close to the P+ and V–
pins as practical. Input leads to these terminals should also
be kept as short as possible. External shielding may be
appropriate in applications where RFI at the 900kHz nominal
oscillator frequency is a problem because the 722 is not
internally shielded.
+15V
+VO1 P+
R1
C1
C
V+
E
–VO1
+VO2
C2
VIN
Each output is filtered with an internal 0.22µF capacitor.
Output ripple voltage can be reduced below the specified
value by adding external capacitors up to 10µF between
each output and its common.
Com
O/P
I/P Com
Com
–VO2 V–
722
Power
Supply
Common
FIGURE 1. Three-Port Isolation.
NOTES: (1) “Output” denotes a single output terminal (+V or –V) and its
associated common. (2) “Channel” denotes a pair of outputs (+V and –V) and
their associated common.
722
6
SBVS016A
www.ti.com
Figure 2 illustrates how the 722 can provide isolated input
power to the input stage of two 3650s connected in the two-
port configuration. Power for the output stage is provided by
the system +15V and –15V supplies. Input stages are iso-
lated from each other and from the system supply. In this
situation, the 722 input-to-output isolation specification ap-
plies to the amplifier input-to-output voltages, whereas the
channel-to-channel 722 specification applies to the voltage
existing between I/P Com #1 and I/P Com #2.
SHORT CIRCUIT PROTECTION
The circuit in Figure 3 may be added to the input of the 722
to protect it from damage in situations where too much
current is demanded from the outputs—such as a short
circuit from an output to its common. The circuit limits input
current to approximately 150mA for an input voltage of
15VDC (for ß of 2N2219 of 50).
+15V –15V
P+
+VO1
C1
+
R1
3.6kΩ
2N2219
V+
E
–VO1
+VO2
C2
VIN
O/P Com
IN4148
+15V
+VO1 P+
V–
100Ω
1Ω
–VO2
–
C
722
R1
C1
V+
E
–VO1
+VO2
C2
I/P
Com #1
VIN
Com
–VO2 V–
I/P
Com #2
722
FIGURE 3. Short-Circuit Protection.
+15V –15V
O/P Com
–15V
O/P Com
FIGURE 2. Two-Port Isolation with Two 3650s.
722
SBVS016A
7
www.ti.com
PACKAGE DRAWING
JND (R-CDIP–P20)
CERAMIC DUAL-IN-LINE
1.120 (28,45)
1.080 (27,43)
20
11
Index
Area
1.120 (28,45)
1.080 (27,43)
0.100 (2,54)
1
1
0
0.100 (2,54)
0.010 (0,25)
0.002 (0,05)
0.285 (7,24)
0.235 (5,97)
Seating Plane
0.350 (8,89)
0.150 (3,81)
0.050 (1,27)
0.035 (0,89)
0.900 (22,86)
0.100 (2,54)
0.021 (0,53)
0.018 (0,46)
4202121/A 03/01
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Leads in true position within 0.010 (0,25) R @
MMC at seating plane.
D. Pin numbers shown for reference only. Numbers may not
be marked on package.
E. A visual index feature must be located within the
cross–hatched area.
722
8
SBVS016A
www.ti.com
PACKAGE OPTION ADDENDUM
www.ti.com
3-Oct-2003
PACKAGING INFORMATION
ORDERABLE DEVICE
STATUS(1)
PACKAGE TYPE
PACKAGE DRAWING
PINS
PACKAGE QTY
0722BG
0722MG
722G
NRND
NRND
CDIP
CDIP
CDIP
JND
JND
JND
20
20
20
17
17
17
ACTIVE
(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.
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