DCP021205DP [TI]
Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS; 微型， 2W ，隔离非稳压DC / DC转换器
| 型号： | DCP021205DP |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS |
| 文件： | 总9页 (文件大小：501K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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DCP02
DCP02 Series
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DCP02
SBVS011C–MARCH 2000–REVISED DECEMBER 2005
Miniature, 2W, Isolated
UNREGULATED DC/DC CONVERTERS
FEATURES
DESCRIPTION
•
•
•
•
•
•
•
Up To 89% Efficiency
The DCP02 series is a family of 2W, isolated,
unregulated DC/DC converters. Requiring a minimum
of external components and including on-chip device
protection, the DCP02 series provides extra features
such as output disable and synchronization of
switching frequencies.
Thermal Protection
Device-to-Device Synchronization
SO-28 Power Density of 106W/in3 (6.5W/cm3 )
EN55022 Class B EMC Performance
UL1950 Recognized Component
The use of a highly integrated package design results
in highly reliable products with power densities of
79W/in3 (4.8W/cm3) for DIP-14, and 106W/in3
(6.5W/cm3) for SO-28. This combination of features
and small size makes the DCP02 suitable for a wide
range of applications.
JEDEC 14-Pin and SO-28 Packages
APPLICATIONS
•
•
•
•
•
Point-of-Use Power Conversion
Ground Loop Elimination
Data Acquisition
Industrial Control and Instrumentation
Test Equipment
800kHz
Oscillator
Divide-by-2
V
OUT
Reset
Power
Stage
0V
Watchdog/
SYNC/DISABLE
Startup
PSU
Thermal
Shutdown
I
BIAS
V
S
Power Controller IC
0V
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.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2005, Texas Instruments Incorporated
DCP02 Series
www.ti.com
SBVS011C–MARCH 2000–REVISED DECEMBER 2005
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated
circuits be handled with appropriate precautions. Failure to observe proper handling and installation
procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision
integrated circuits may be more susceptible to damage because very small parametric changes could
cause the device not to meet its published specifications.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this
data sheet, or see the TI website at www.ti.com.
Supplemental Ordering Information
DCP02 05 05 (D)
( )
Basic Model Number: 2W Product
Voltage Input:
5V In
Voltage Output:
5V Out
Dual Output:
Package Code:
P = DIP-14
U = SO-28
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)
(1)
DCP02 Series
UNIT
V
5V input models
7
12V input models
Input Voltage
15
V
15V input models
18
29
V
24V input models
V
Storage temperature range
–60 to +125
°C
(1) 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.
2
DCP02 Series
www.ti.com
SBVS011C–MARCH 2000–REVISED DECEMBER 2005
ELECTRICAL CHARACTERISTICS
At TA = +25°C, unless otherwise noted.
PARAMETER
OUTPUT
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Power
100% full load
2
W
Ripple
O/P capacitor = 1µF, 50% load
20
mVPP
INPUT
Voltage range on VS
ISOLATION
–10
10
%
1s Flash test
1
1
kVrms
kVrms
Voltage
60s test, UL1950(1)
LINE
Regulation
1
%/1% of VS
SWITCHING/SYNCHRONIZATION
Oscillator frequency (fOSC
)
Switching frequency = fOSC/2
VSYNC = +2V
800
kHz
V
Sync input low
0
0.4
10
Sync input current
Disable time
75
2
µA
µs
pF
Capacitance loading on SYNC pin
RELIABILITY
External
Demonstrated
TA = +55°C
75
FITS
THERMAL SHUTDOWN
IC temperature at shutdown
Shutdown current
+150
3
°C
mA
TEMPERATURE RANGE
Operating
–40
+85
°C
(1) During UL1950 recognition tests only.
ELECTRICAL CHARACTERISTICS PER DEVICE
At TA = +25°C, unless otherwise noted.
INPUT
VOLTAGE
(V)
OUTPUT
VOLTAGE
(V)
LOAD
REGULATION
(%)
NO LOAD
CURRENT
(mA)
BARRIER
CAPACITANCE
(pF)
EFFICIENCY
(%)
VS
VNOM
IQ
0% LOAD
TYP
18
CISO
75% LOAD(1)
10% TO 100% LOAD
100% LOAD
VISO = 750Vrms
PRODUCT
DCP020503P, U
DCP020505P, U
DCP020507P, U
DCP020509P, U
DCP020515DP, U
DCP021205P, U
DCP021212P, U
DCP021212DP, U
DCP021215DP, U
DCP021515P, U
DCP022405P
MIN
TYP MAX
MIN
TYP
3.3
5
MAX
3.46
TYP
19
14
14
12
11
7
MAX
30
20
25
20
20
15
20
20
20
20
10
15
15
16
25
25
TYP
TYP
4.5
4.5
5
5
5.5
5.5
3.13
4.75
74
80
81
82
85
83
87
88
87
88
81
81
80
83
79
84
26
22
30
31
24
33
47
35
33
42
33
33
22
29
44
32
5.25
18
4.5
5
5.5
6.65
7
7.35
20
4.5
5
5.5
8.55
9
9.45
23
4.5
5
5.5
±14.25
4.75
±15
5
±15.75
5.25
27
10.8
10.8
10.8
10.8
13.5
21.6
21.6
21.6
21.6
21.6
21.6
12
12
12
12
15
24
24
24
24
24
24
13.2
13.2
13.2
13.2
16.5
26.4
26.4
26.4
26.4
26.4
26.4
14
11.4
12
±12
±15
15
5
12.6
7
15
±11.4
±14.25
14.25
4.85
±12.6
±15.75
15.75
5.35
6
16
6
21
6
15
6
13
DCP022405U
4.75
5
5.25
10
6
13
DCP022405DP, U
DCP022412DP, U
DCP022415DP, U
DCP022418DP, U
±4.75
±11.4
±14.25
±17.1
±5
±12
±15
±18
+5.25
±12.6
±15.75
±18.9
12
4
19
6
16
9
20
(1) 100% load current = 2W/VNOM typ.
3
DCP02 Series
www.ti.com
SBVS011C–MARCH 2000–REVISED DECEMBER 2005
DEVICE INFORMATION
NVA PACKAGE
DIP-14 (Single-DIP)
(Top View)
NVA PACKAGE
DIP-14 (Dual-DIP)
(Top View)
V
1
14 SYNC
S
V
1
14 SYNC
S
0V
2
0V
2
DCP02
DCP02
0V
5
6
7
0V
5
6
7
+V
OUT
+V
OUT
NC
8
NC
-V
8
NC
OUT
Table 1. Pin Description (Single-DIP)
Table 3. TERMINAL FUNCTIONS (Dual-DIP)
TERMINAL
TERMINAL
NAME
VS
NO. DESCRIPTION
NAME
NO. DESCRIPTION
1
2
5
6
Voltage input
VS
1
2
Voltage input
0V
Input side common
Output side common
+Voltage out
0V
Input side common
Output side common
+Voltage out
0V
0V
5
+VOUT
NC
+VOUT
–VOUT
NC
6
7, 8 Not connected
14 Synchronization pin
7
–Voltage out
SYNC
8
Not connected
SYNC
14
Synchronization pin
DVB PACKAGE
SO-28 (Single-SO)
(Top View)
DVB PACKAGE
SO-28 (Dual-SO)
(Top View)
V
1
28 SYNC
27 NC
S
0V
2
V
1
2
3
28 SYNC
27 NC
S
0V
3
26 NC
0V
0V
26 NC
DCP02
DCP02
0V 12
17 NC
16 NC
15 NC
+V
13
0V 12
17 NC
16 NC
15 NC
OUT
NC 14
+V
13
OUT
-V
14
OUT
Table 2. TERMINAL FUNCTIONS (Single-SO)
TERMINAL
Table 4. TERMINAL FUNCTIONS (Dual-SO)
NAME
VS
NO.
1
DESCRIPTION
Voltage input
TERMINAL
NAME
VS
NO.
1
DESCRIPTION
Voltage input
0V
2
Input side common
Input side common
Output side common
+Voltage out
0V
3
0V
2
Input side common
Input side common
Output side common
+Voltage out
0V
12
13
0V
3
+VOUT
0V
12
13
14
14, 15, 16,
17, 26, 27
+VOUT
–VOUT
NC
Not connected
–Voltage out
SYNC
28
Synchronization pin
15, 16, 17,
26, 27
NC
Not connected
SYNC
28
Synchronization pin
4
DCP02 Series
www.ti.com
SBVS011C–MARCH 2000–REVISED DECEMBER 2005
TYPICAL CHARACTERISTICS
At TA = +25°C, unless otherwise noted.
DCP020505P
CONDUCTED EMISSIONS (500mA Load)
DCP020505P
VOUT vs TEMPERATURE (75% Load)
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
60
50
40
30
20
10
0
-10
-20
-40
-20
0
20
40
60
80
100
0.15
1
10
30
Temperature (°C)
Frequency (MHz)
Figure 1.
Figure 2.
DCP021205P
VOUT vs LOAD
DCP021205P
POWER OUT vs TEMPERATURE (400mA Load)
5.4
5.3
5.2
5.1
5.0
2.5
2.0
1.5
1.0
0.5
0
4.9
0
20
40
60
80
100
-50
-25
0
25
50
75
100
Load (%)
Temperature (°C)
Figure 3.
Figure 4.
DCP0212
EFFICIENCY vs LOAD
DCP020505P
OUTPUT AC RIPPLE (20MHz Band)
100
80
60
40
20
450
400
350
300
250
200
150
100
50
DCP1212DP
DCP1205P
0.1F
1F
0
0
0
25
50
75
100
0
200
400
Load (%)
Load Current (mA)
Figure 5.
Figure 6.
5
DCP02 Series
www.ti.com
SBVS011C–MARCH 2000–REVISED DECEMBER 2005
FUNCTIONAL DESCRIPTION
This is due to the small variations in switching
frequencies between the DC/DC converters.
OVERVIEW
The DCP02 overcomes this by allowing devices to be
synchronized to one another. Up to eight devices can
be synchronized by connecting the SYNC pins
together, taking care to minimize the capacitance of
tracking. Stray capacitance (> 10pF) will have the
effect of reducing the switching frequency, or even
stopping the oscillator circuit. It is also recommended
that power and ground lines be star-connected.
The DCP02 offers up to 2W of unregulated output
power from a 5V, 12V, 15V, or 24V input source with
a typical efficiency of up to 89%. This is achieved
through highly integrated packaging technology and
the implementation of a custom power stage and
control IC. The circuit design uses an advanced
BiCMOS/DMOS process.
POWER STAGE
It should be noted that if synchronized devices are
used at start up, all devices will draw maximum
current simultaneously. This can cause the input
voltage to dip, and if it dips below the minimum input
voltage (4.5V), the devices may not start up. A 2.2µF
capacitor should be connected close to the input pins.
The DCP02 uses a push-pull, center-tapped topology
switching at 400kHz (divide-by-2 from an 800kHz
oscillator).
OSCILLATOR AND WATCHDOG
If more than eight devices are to be synchronized, it
is recommended that the SYNC pins be driven by an
external device. Details are contained in Application
Report SBAA035, External Synchronization of the
DCP01/02 Series of DC/DC Converters, available for
download from www.ti.com.
The onboard 800kHz oscillator generates the
switching frequency via a divide-by-2 circuit. The
oscillator can be synchronized to other DCP02
circuits or an external source, and is used to minimize
system noise.
A watchdog circuit checks the operation of the
oscillator circuit. The oscillator can be stopped by
pulling the SYNC pin low. The output pins will be
tri-stated. This will occur in 2µs.
CONSTRUCTION
The basic construction of the DCP02 is the same as
standard ICs. There is no substrate within the molded
package. The DCP02 is constructed using an IC,
rectifier diodes, and a wound magnetic toroid on a
leadframe. Since there is no solder within the
package, the DCP02 does not require any special
printed circuit board (PCB) assembly processing. This
results in an isolated DC/DC converter with inherently
high reliability.
THERMAL SHUTDOWN
The DCP02 is protected by a thermal-shutdown
circuit. If the on-chip temperature exceeds +150°C,
the device will shut down. Once the temperature falls
below +150°C, normal operation will resume.
SYNCHRONIZATION
In the event that more than one DC/DC converter is
needed onboard, beat frequencies and other
electrical interference can be generated.
V
V
V
SUPPLY
OUT 1
S
SYNC
DCP
02
0V
0V
V
+ V
OUT 2
OUT 1
V
V
OUT 2
S
SYNC
DCP
02
0V
0V
COM
Figure 7. Connecting the DCP02 in Series
6
DCP02 Series
www.ti.com
SBVS011C–MARCH 2000–REVISED DECEMBER 2005
ADDITIONAL FUNCTIONS
Connecting the DCP02 in Series
DISABLE/ENABLE
Multiple DCP02 isolated 2W DC/DC converters can
be connected in series to provide nonstandard
voltage rails. This is possible by using the floating
outputs provided by the galvanic isolation of the
DCP02.
The DCP02 can be disabled or enabled by driving the
SYNC pin using an open drain CMOS gate. If the
SYNC pin is pulled low, the DCP02 will be disabled.
The disable time depends upon the external loading;
the internal disable function is implemented in 2µs.
Removal of the pull down will cause the DCP02 to be
enabled.
Connect the positive VOUT from one DCP02 to the
negative VOUT (0V) of another (see Figure 7). If the
SYNC pins are tied together, the self-synchronization
feature of the DCP02 will prevent beat frequencies on
the voltage rails. The SYNC feature of the DCP02
allows easy series connection without external
filtering, thus minimizing cost.
Capacitive loading on the SYNC pin should be
minimized in order to prevent a reduction in the
oscillator frequency.
DECOUPLING
The outputs on the dual-output DCP02 versions can
also be connected in series to provide two times the
magnitude of VOUT, as shown in Figure 8. For
Ripple Reduction
The high switching frequency of 400kHz allows
simple filtering. To reduce ripple, it is recommended
that a 1µF capacitor be used on VOUT. Dual outputs
should both be decoupled to pin 5. A 2.2µF capacitor
on the input is recommended.
example,
a dual 15V DCP022415D could be
connected to provide a 30V rail.
Connecting the DCP02 in Parallel
If the output power from one DCP02 is not sufficient,
it is possible to parallel the outputs of multiple
DCP02s, as shown in Figure 9. Again, the SYNC
feature allows easy synchronization to prevent
power-rail beat frequencies at no additional filtering
cost.
V
+V
SUPPLY
V
+V
OUT
S
OUT
OUT
0V
-V
DCP
02
-V
OUT
0V
COM
Figure 8. Connecting Dual Outputs in Series
V
V
V
SUPPLY
OUT
S
SYNC
DCP
02
0V
0V
2 x Power Out
V
V
OUT
S
SYNC
DCP
02
0V
0V
COM
Figure 9. Connecting Multiple DCP02s in Parallel
7
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accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
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