Miniature, 2W Isolated
UNREGULATED DC/DC CONVERTERS
FEATURES
q
UP TO 89% EFFICIENCY
q
THERMAL PROTECTION
q
DEVICE-TO-DEVICE SYNCHRONIZATION
q
SO-28 POWER DENSITY OF 106W/in
3
(6.5W/cm
3
)
q
EN55022 CLASS B EMC PERFORMANCE
q
UL1950 RECOGNIZED
q
JEDEC 14-PIN AND SO-28 PACKAGES
DESCRIPTION
The DCP02 series is a family of 2W, unregulated, isolated
DC/DC converters. Requiring a minimum of external com-
ponents and including on-chip device protection, the DCP02
series provides extra features such as output disable and
synchronization of switching frequencies.
The use of a highly integrated package design results in highly
reliable products with power densitiesof 79W/in
3
(4.8W/cm
3
)
for DIP-14, and 106W/in
3
(6.5W/cm
3
) for SO-28. This com-
bination of features and small size makes the DCP02 suitable
for a wide range of applications.
APPLICATIONS
q
POINT-OF-USE POWER CONVERSION
q
GROUND LOOP ELIMINATION
q
DATA ACQUISITION
q
INDUSTRIAL CONTROL AND INSTRUMENTATION
q
TEST EQUIPMENT
I
BIAS
Power
Stage
V
OUT
2
Reset
800kHz
Oscillator
Watch-dog/
start-up
PSU
Thermal
Shutdown
SYNC/DISABLE
V
S
0V
Power Controller IC
0V
DCP02
DCP02
DCP02
SERIES
SBVS011B MAY 2001
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.
Copyright 2001, Texas Instruments Incorporated
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.
www.ti.com
DCP02
2
SBVS011B
PACKAGE
SPECIFIED
DRAWING
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
PACKAGE
NUMBER
RANGE
MARKING
NUMBER
(1)
MEDIA
Single
DCP020503P
DIP-14
010-1
40
C to +85
C
DCP020503P
DCP020503P
Rails
DCP020503U
SO-28
217-2
40
C to +85
C
DCP020503U
DCP020503U/1K
Tape and Reel
DCP020505P
DIP-14
010-1
40
C to +85
C
DCP020505P
DCP020505P
Rails
DCP020505U
SO-28
217-2
40
C to +85
C
DCP020505U
DCP020505U/1K
Tape and Reel
DCP020507P
DIP-14
010-1
40
C to +85
C
DCP020507P
DCP020507P
Rails
DCP020507U
SO-28
217-2
40
C to +85
C
DCP020507U
DCP020507U/1K
Tape and Reel
DCP020509P
DIP-14
010-1
40
C to +85
C
DCP020509P
DCP020509P
Rails
DCP020509U
SO-28
217-2
40
C to +85
C
DCP020509U
DCP020509U/1K
Tape and Reel
DCP021205P
DIP-14
010-1
40
C to +85
C
DCP021205P
DCP021205P
Rails
DCP021205U
SO-28
217-2
40
C to +85
C
DCP021205U
DCP021205U/1K
Tape and Reel
DCP021212P
DIP-14
010-1
40
C to +85
C
DCP021212P
DCP021212P
Rails
DCP021212U
SO-28
217-2
40
C to +85
C
DCP021212U
DCP021212U/1K
Tape and Reel
DCP021515P
DIP-14
010-1
40
C to +85
C
DCP021515P
DCP021515P
Rails
DCP021515U
SO-28
217-2
40
C to +85
C
DCP021515U
DCP021515U/1K
Tape and Reel
DCP022405P
DIP-14
010-1
40
C to +85
C
DCP022405P
DCP022405P
Rails
DCP022405U
SO-28
217-2
40
C to +85
C
DCP022405U
DCP022405U/1K
Tape and Reel
Dual
DCP020515DP
DIP-14
010-1
40
C to +85
C
DCP020515DP
DCP020515DP
Rails
DCP020515DU
SO-28
217-2
40
C to +85
C
DCP020515DU
DCP020515DU/1K
Tape and Reel
DCP021212DP
DIP-14
010-1
40
C to +85
C
DCP021212DP
DCP021212DP
Rails
DCP021212DU
SO-28
217-2
40
C to +85
C
DCP021212DU
DCP021212DU/1K
Tape and Reel
DCP022405DP
DIP-14
010-1
40
C to +85
C
DCP022405DP
DCP022405DP
Rails
DCP022405DU
SO-28
217-2
40
C to +85
C
DCP022405DU
DCP022405DU/1K
Tape and Reel
DCP022415DP
DIP-14
010-1
40
C to +85
C
DCP022415DP
DCP022415DP
Rails
DCP022415DU
SO-28
217-2
40
C to +85
C
DCP022415DU
DCP022415DU/1K
Tape and Reel
NOTES: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /1K indicates 1000 devices per reel). Ordering 1000
pieces of "DCP020503U/1K" will get a single 1000-piece Tape and Reel.
ELECTROSTATIC
DISCHARGE SENSITIVITY
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.
ESD damage can range from subtle performance degrada-
tion 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.
Input Voltage
5V Input Models .................................................................................. 7V
12V Input Models .............................................................................. 15V
15V Input Models .............................................................................. 18V
24V Input Models .............................................................................. 29V
Storage Temperature ...................................................... 60
C to +125
C
Lead Temperature (soldering, 10s) ................................................. 270
C
ABSOLUTE MAXIMUM RATINGS
DCP02
Basic Model Number: 2W Product
Voltage Input:
5V In
Voltage Output:
5V Out
Dual Output:
Package Code:
P = DIP-14
U = SO-28
ORDERING INFORMATION
05
05
(
)
( D )
PACKAGE/ORDERING INFORMATION
SBVS011B
DCP02
3
INPUT
OUTPUT
LOAD
NO LOAD
BARRIER
VOLTAGE (V)
VOLTAGE (V)
REGULATION (%)
CURRENT (mA)
EFFICIENCY (%)
CAPACITANCE (pF)
V
S
V
NOM
I
Q
C
ISO
75% LOAD
(2)
10% TO 100% LOAD
0% LOAD
100% LOAD
V
ISO
= 750V
RMS
PRODUCT
MIN
TYP
MAX
MIN
TYP
MAX
TYP
MAX
TYP
TYP
TYP
DCP020503P, U
4.5
5
5.5
3.13
3.3
3.46
19
30
18
74
26
DCP020505P, U
4.5
5
5.5
4.75
5
5.25
14
20
18
80
22
DCP020507P, U
4.5
5
5.5
6.65
7
7.35
14
25
20
81
30
DCP020509P, U
4.5
5
5.5
8.55
9
9.45
12
20
23
82
31
DCP020515DP, U
4.5
5
5.5
14.25
15
15.75
11
20
27
85
24
DCP021205P, U
10.8
12
13.2
4.75
5
5.25
7
15
14
83
33
DCP021212P, U
10.8
12
13.2
11.4
12
12.6
7
20
15
87
47
DCP021212DP, U
10.8
12
13.2
11.4
12
12.6
6
20
16
88
35
DCP021515P, U
13.5
15
16.5
14.25
15
15.75
6
20
15
88
42
DCP022405P
21.6
24
26.4
4.85
5
5.35
6
10
13
81
33
DCP022405U
21.6
24
26.4
4.75
5
5.25
10
15
13
81
33
DCP022405DP, U
21.6
24
26.4
4.75
5
5.25
6
15
12
80
22
DCP022415DP, U
21.6
24
26.4
14.25
15
15.75
6
25
16
79
44
NOTES: (1) During UL1950 recognition tests only. (2) 100% Load Current = 2W/V
NOM
TYP.
ELECTRICAL CHARACTERISTICS
At T
A
= +25
C, unless otherwise specified.
DCP02 SERIES
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT
Power
100% Full Load
2
W
Ripple
O/P Capacitor = 1
F, 50% Load
20
mVp-p
INPUT
Voltage Range on V
S
10
10
%
ISOLATION
Voltage
1s Flash Test
1
kVrms
60s Test, UL1950
(1)
1
kVrms
LINE
Regulation
1
%/1% of V
S
SWITCHING/SYNCHRONIZATION
Oscillator Frequency (f
OSC
)
Switching Frequency = f
OSC
/2
800
kHz
Sync Input Low
0
0.4
V
Sync Input Current
V
SYNC
= +2V
75
A
Disable Time
2
s
Capacitance Loading on Sync Pin
External
10
pF
RELIABILITY
Demonstrated
T
A
= +55
C
75
FITS
THERMAL SHUTDOWN
IC Temperature at Shutdown
150
C
Shutdown Current
3
mA
TEMPERATURE RANGE
Operating
40
+85
C
DCP02
4
SBVS011B
Top View
SO
PIN CONFIGURATION (Single-SO)
Top View
SO
PIN CONFIGURATION (Dual-SO)
PIN DEFINITION (Single-SO)
PIN #
PIN NAME
DESCRIPTION
1
V
S
Voltage Input
2
0V
Input Side Common
3
0V
Input Side Common
12
0V
Output Side Common
13
+V
OUT
+Voltage Out
14
NC
Not Connected
15
NC
Not Connected
16
NC
Not Connected
17
NC
Not Connected
26
NC
Not Connected
27
NC
Not Connected
28
SYNC
Synchronization Pin
PIN DEFINITION (Dual-SO)
DCP02
1
2
3
12
13
14
28
27
26
17
16
15
V
S
0V
0V
0V
+V
OUT
NC
SYNC
NC
NC
NC
NC
NC
DCP02
1
2
3
12
13
14
28
27
26
17
16
15
V
S
0V
0V
0V
+V
OUT
V
OUT
SYNC
NC
NC
NC
NC
NC
PIN #
PIN NAME
DESCRIPTION
1
V
S
Voltage Input
2
0V
Input Side Common
3
0V
Input Side Common
12
0V
Output Side Common
13
+V
OUT
+Voltage Out
14
V
OUT
Voltage Out
15
NC
Not Connected
16
NC
Not Connected
17
NC
Not Connected
26
NC
Not Connected
27
NC
Not Connected
28
SYNC
Synchronization Pin
Top View
DIP
PIN CONFIGURATION (Single-DIP)
Top View
DIP
PIN CONFIGURATION (Dual-DIP)
PIN DEFINITION (Single-DIP)
PIN #
PIN NAME
DESCRIPTION
1
V
S
Voltage Input
2
0V
Input Side Common
5
0V
Output Side Common
6
+V
OUT
+Voltage Out
7
NC
Not Connected
8
NC
Not Connected
14
SYNC
Synchronization Pin
PIN DEFINITION (Dual-DIP)
PIN #
PIN NAME
DESCRIPTION
1
V
S
Voltage Input
2
0V
Input Side Common
5
0V
Output Side Common
6
+V
OUT
+Voltage Out
7
V
OUT
Voltage Out
8
NC
Not Connected
14
SYNC
Synchronization Pin
DCP02
1
2
5
6
7
14
8
V
S
0V
0V
+V
OUT
NC
SYNC
NC
DCP02
1
2
5
6
7
14
8
V
S
0V
0V
+V
OUT
V
OUT
SYNC
NC
SBVS011B
DCP02
5
TYPICAL CHARACTERISTICS
At T
A
= +25
C, unless otherwise noted.
DCP020505P
V
OUT
vs TEMPERATURE (75% Load)
Temperature (
C)
V
OUT
(V)
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
20
20
40
60
80
100
0
40
DCP021205P
V
OUT
vs LOAD
5.4
5.3
5.2
5.1
5.0
4.9
Load (%)
V
OUT
(V)
0
20
40
60
80
100
DCP021205P
POWER OUT vs TEMPERATURE (400mA Load)
Temperature (
C)
P
OUT
(W)
0
25
50
75
100
25
50
2.5
2.0
1.5
1.0
0.5
0
DCP0212
EFFICIENCY vs LOAD
100
80
60
40
20
0
Load (%)
Ef
ficiency (%)
0
25
50
75
100
DCP1212DP
DCP1205P
DCP020505P
OUTPUT AC RIPPLE (20MHz Band)
450
400
350
300
250
200
150
100
50
0
Load Current (mA)
Ripple (mVp-p)
0
200
0.1
F
400
1
F
DCP020505P
CONDUCTED EMISSIONS (500mA Load)
Emission Level, Peak (dB
A)
Frequency (MHz)
1
0.15
10
30
60
50
40
30
20
10
0
10
20
DCP02
6
SBVS011B
FIGURE 1. Connecting the DCP02 in Series.
DCP
02
V
OUT 1
V
SUPPLY
V
S
0V
DCP
02
V
OUT 2
V
OUT1
+ V
OUT 2
SYNC
SYNC
V
S
0V
0V
0V
COM
FUNCTIONAL DESCRIPTION
OVERVIEW
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
utilizes an advanced BiCMOS/DMOS process.
POWER STAGE
This uses a push-pull, center-tapped topology switching at
400kHz (divide by 2 from 800kHz oscillator).
OSCILLATOR AND WATCHDOG
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 2
s.
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. This is due to the variation in switching
frequencies between the DC/DC converters.
The DCP02 overcomes this by allowing devices to be syn-
chronized to one another. Up to eight devices can be syn-
chronized by connecting the SYNC pins together, taking
care to minimize the capacitance of tracking. Significant
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
are star connected.
If synchronized devices are used, it should be noted that, at
start up, all devices will draw maximum current simulta-
neously. This can cause the input voltage to dip and should
it dip below the minimum input voltage (4.5V), the devices
may not start up. A 2.2
F capacitor should be connected
close to the input pins.
If more than eight devices are to be synchronized, it is
recommended that the SYNC pins are driven by an external
device. Details are contained in a separate applications
bulletin (AB-153).
CONSTRUCTION
The DCP02's basic construction 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. As there is no solder
within the package, the DCP02 does not require any special
PCB assembly processing. This results in an isolated
DC/DC converter with inherently high reliability.
SBVS011B
DCP02
7
FIGURE 2. Connecting Dual Outputs in Series.
ADDITIONAL FUNCTIONS
DISABLE/ENABLE
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 func-
tion is implemented in 2
s. Removal of the pull down will
cause the DCP02 to be enabled.
Capacitive loading on the SYNC pin should be minimized in
order to prevent a reduction in the oscillator frequency.
DECOUPLING
Ripple Reduction
The high switching frequency of 400kHz allows simple
filtering. To reduce ripple, it is recommended that a 1
F
capacitor is used on V
OUT
. Dual outputs should both be
decoupled to pin 5. A 2.2
F capacitor on the input is
recommended.
Connecting the DCP02 in Series
Multiple DCP02 isolated 2W DC/DC converters can be
connected in series to provide nonstandard voltage rails.
This is possible by utilizing the floating outputs provided by
the DCP02's galvanic isolation.
Connect the positive V
OUT
from one DCP02 to the negative
V
OUT
(0V) of another (see Figure 1). 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, minimizing cost.
The outputs on dual output DCP02 versions can also be
connected in series to provide two times the magnitude of
V
OUT
as shown in Figure 2. For 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 3. Again, the SYNC feature allows easy
synchronization to prevent power-rail beat frequencies at no
additional filtering cost.
DCP
02
+V
OUT
V
SUPPLY
+V
OUT
V
OUT
V
OUT
0V
V
S
0V
COM
FIGURE 3. Connecting Multiple DCP02s in Parallel.
DCP
02
0V
0V
V
OUT
V
SUPPLY
V
S
0V
DCP
02
V
OUT
2 x Power Out
SYNC
SYNC
V
S
0V
COM
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its products to the specifications applicable at the time of sale in accordance with
TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary
to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except
those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer's applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
products or services might be or are used. TI's publication of information regarding any third party's products
or services does not constitute TI's approval, license, warranty or endorsement thereof.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
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service, is an unfair and deceptive business practice, and TI is not responsible nor liable for any such use.
Resale of TI's products or services with
statements different from or beyond the parameters stated by TI for
that product or service voids all express and any implied warranties for the associated TI product or service,
is an unfair and deceptive business practice, and TI is not responsible nor liable for any such use.
Also see: Standard Terms and Conditions of Sale for Semiconductor Products. www.ti.com/sc/docs/stdterms.htm
Mailing Address:
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Post Office Box 655303
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Copyright
2001, Texas Instruments Incorporated
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