1
DCP01B
Miniature, 1W Isolated
UNREGULATED DC/DC CONVERTERS
2000 Burr-Brown Corporation
PDS-1586B
Printed in U.S.A. May, 2000
DCP01B
Series
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111
Twx: 910-952-1111 Internet: http://www.burr-brown.com/ Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
FEATURES
q
UP TO 85% EFFICIENCY
q
THERMAL PROTECTION
q
DEVICE-TO-DEVICE SYNCHRONIZATION
q
SHORT CIRCUIT PROTECTION
q
EN55022 CLASS B EMC PERFORMANCE
q
UL1950 RECOGNIZED COMPONENT
q
JEDEC PDIP-14 AND GULL-WING PACKAGES
DESCRIPTION
The DCP01B series is a family of 1W, unregulated,
isolated DC/DC converters. Requiring a minimum of
external components and including on-chip device
protection, the DCP01B series provides extra features
such as output disable and synchronization of switch-
ing frequencies.
The use of a highly integrated package design results
in highly reliable products with a power density of
40W/in
3
(2.4W/cm
3
). This combination of features
and small size makes the DCP01B 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
For most current data sheet and other product
information, visit www.burr-brown.com
I
BIAS
Power
Stage
V
OUT
2
Reset
800kHz
Oscillator
Watch-dog/
start-up
PSU
Thermal
Shutdown
SYNC
OUT
SYNC
IN
V
S
0V
Power Controller IC
0V
DCP01
DCP01
2
DCP01B
Basic Model Number: 1W Product
Voltage Input:
5V In
Voltage Output:
5V Out
Dual Output:
Model Revision:
Package Code:
P = PDIP-14
P-U = PDIP-14 Gull-Wing
05
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
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
24V Input Models .............................................................................. 29V
Storage Temperature ...................................................... 60
C to +125
C
Lead Temperature (soldering, 10s) ................................................. 270
C
ABSOLUTE MAXIMUM RATINGS
ORDERING INFORMATION
05
(
)
( D )
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
(3)
0% LOAD
100% LOAD
V
ISO
= 750V
RMS
PRODUCT
MIN
TYP
MAX
MIN
TYP
MAX
TYP
MAX
TYP
TYP
TYP
DCP010505B
4.5
5
5.5
4.75
5
5.25
19
31
20
80
3.6
DCP010505DB
4.5
5
5.5
4.25
5
5.75
18
32
22
81
3.8
DCP010512B
4.5
5
5.5
11.4
12
12.6
21
38
29
85
5.1
DCP010512DB
4.5
5
5.5
11.4
12
12.6
19
37
40
82
4.0
DCP010515B
4.5
5
5.5
14.25
15
15.75
26
42
34
82
3.8
DCP010515DB
4.5
5
5.5
14.25
15
15.75
19
41
42
85
4.7
DCP012405B
21.6
24
26.4
4.75
5
5.25
13
23
14
77
3.8
NOTES: (1) During UL1950 recognition tests only. (2) 100% Load Current = 1W/V
NOM
TYP. (3) Load regulation = (V
OUT
at 10% Load V
OUT
at 100% Load)/V
OUT
at 75% Load.
SPECIFICATIONS
At T
A
= +25
C, unless otherwise specified.
DCP01B SERIES
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT
Power
100% Full Load
0.97
W
Ripple
O/P Capacitor = 1
F, 50% Load
20
mVp-p
Voltage vs Temp
Room to Cold
0.046
%/
C
Room to Hot
0.016
%/
C
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
IN
Pin
External
3
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
+100
C
DCP01
( B )
3
DCP01B
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
PACKAGE
SPECIFIED
DRAWING
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
PACKAGE
NUMBER
RANGE
MARKING
NUMBER
(1)
MEDIA
Single
DCP010505BP
DIP-14
010-1
40
C to +100
C
DCP010505BP
DCP010505BP
Rails
DCP010505BP-U
DIP-14 Gull-Wing
010-2
40
C to +100
C
DCP010505BP-U
DCP010505BP-U/700
Tape and Reel
DCP010512BP
DIP-14
010-1
40
C to +100
C
DCP010512BP
DCP010512BP
Rails
DCP010512BP-U
DIP-14 Gull-Wing
010-2
40
C to +100
C
DCP010512BP-U
DCP010512BP-U/700
Tape and Reel
DCP010515BP
DIP-14
010-1
40
C to +100
C
DCP010515BP
DCP010515BP
Rails
DCP010515BP-U
DIP-14 Gull-Wing
010-2
40
C to +100
C
DCP010515BP-U
DCP010515BP-U/700
Tape and Reel
DCP012405BP
DIP-14
010-1
40
C to +100
C
DCP012405BP
DCP012405BP
Rails
DCP012405BP-U
DIP-14 Gull-Wing
010-2
40
C to +100
C
DCP012405BP-U
DCP012405BP-U/700
Tape and Reel
Dual
DCP010505DBP
DIP-14
010-1
40
C to +100
C
DCP010505DBP
DCP010505DBP
Rails
DCP010505DBP-U
DIP-14 Gull-Wing
010-2
40
C to +100
C
DCP010505DBP-U
DCP010505DBP-U/700
Tape and Reel
DCP010512DBP
DIP-14
010-1
40
C to +100
C
DCP010512DBP
DCP010512DBP
Rails
DCP010512DBP-U
DIP-14 Gull-Wing
010-2
40
C to +100
C
DCP010512DBP-U
DCP010512DBP-U/700
Tape and Reel
DCP010515DBP
DIP-14
010-1
40
C to +100
C
DCP010515DBP
DCP010515DBP
Rails
DCP010515DBP-U
DIP-14 Gull-Wing
010-2
40
C to +100
C
DCP010515DBP-U
DCP010515DBP-U/700
Tape and Reel
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /700 indicates 700 devices per reel). Ordering 700 pieces
of "DCP010505BP-U/700" will get a single 700-piece Tape and Reel.
PACKAGE/ORDERING INFORMATION
Top View
DIP
PIN CONFIGURATION (Single-DIP and Gull-Wing)
Top View
DIP
PIN CONFIGURATION (Dual-DIP and Gull-Wing)
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
SYNC
OUT
Unrectified Transformer Output
14
SYNC
IN
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
SYNC
OUT
Unrectified Transformer Output
14
SYNC
IN
Synchronization Pin
DCP01DB
1
2
5
6
7
14
8
V
S
0V
0V
+V
OUT
V
OUT
SYNC
IN
SYNC
OUT
DCP01B
1
2
5
6
7
14
8
V
S
0V
0V
+V
OUT
NC
SYNC
IN
SYNC
OUT
4
DCP01B
TYPICAL PERFORMANCE CURVES
At T
A
= +25
C, unless otherwise noted.
DCP010505B
OUTPUT RIPPLE vs LOAD (20MHz BW)
Load (%)
Ripple (mVp-p)
50
45
40
35
30
25
20
15
10
5
0
20
30
50
70
60
80
90
100
40
10
1
F Ceramic
4.7
F Ceramic
10
F Ceramic
DCP010505B V
OUT
vs V
S
V
S
(V)
V
OUT
(V)
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.6
4.7
4.9
5.1
5.0
5.2
5.4
5.3
5.5
4.8
4.5
DCP010505B V
OUT
vs LOAD
Load (%)
V
OUT
(V)
5.8
5.7
5.6
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
100
10
20
30
40
50
60
70
80
90
DCP010505B EFFICIENCY vs LOAD
Load (%)
Ef
ficiency (%)
85
80
75
70
65
60
55
100
10
20
30
40
50
60
70
80
90
DCP010505DB V
OUT
vs LOAD
Load (%)
V
OUT
(V)
5.8
5.7
5.6
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
100
10
20
30
40
50
60
70
80
90
+V
OUT
V
OUT
DCP010505DB EFFICIENCY vs LOAD
Load (%)
Ef
ficiency (%)
85
80
75
70
65
60
55
100
10
20
30
40
50
60
70
80
90
5
DCP01B
TYPICAL PERFORMANCE CURVES
(Cont.)
At T
A
= +25
C, unless otherwise noted.
DCP010512B V
OUT
vs LOAD
Load (%)
V
OUT
(V)
14.5
14
13.5
13
12.5
12
11.5
11
100
10
20
30
40
50
60
70
80
90
DCP010512B EFFICIENCY vs LOAD
Load (%)
Ef
ficiency (%)
90
85
80
75
70
65
60
55
50
100
10
20
30
40
50
60
70
80
90
DCP010512DB V
OUT
vs LOAD
Load (%)
V
OUT
(V)
14.5
14.0
13.5
13.0
12.5
12.0
11.5
11.0
10.5
10.00
20
30
50
70
60
80
90
100
40
10
+V
OUT
V
OUT
DCP010512DB EFFICIENCY vs LOAD
Load (%)
Ef
ficiency (%)
85
80
75
70
65
60
55
50
20
30
50
70
60
80
90
100
40
10
DCP010515B EFFICIENCY vs LOAD
Load (%)
Ef
ficiency (%)
85
80
75
70
65
60
55
50
100
10
20
30
40
50
60
70
80
90
DCP010515B V
OUT
vs LOAD
Load (%)
V
OUT
(V)
18
17.5
17
16.5
16
15.5
15
14.5
14
100
10
20
30
40
50
60
70
80
90
6
DCP01B
TYPICAL PERFORMANCE CURVES
(Cont.)
At T
A
= +25
C, unless otherwise noted.
DCP010515DB V
OUT
vs LOAD
Load (%)
V
OUT
(V)
18
17
16
15
14
20
30
50
70
60
80
90
100
40
10
+V
OUT
V
OUT
DCP010515DB EFFICIENCY vs LOAD
Load (%)
Ef
ficiency (%)
90
85
80
75
70
65
60
55
50
20
30
50
70
60
80
90
100
40
10
DCP012405B V
OUT
vs LOAD
Load (%)
V
OUT
(V)
5.60
5.50
5.40
5.30
5.20
5.10
5.00
4.90
4.80
20
30
60
50
70
80
100
40
10
DCP012405B EFFICIENCY vs LOAD
Load (%)
Ef
ficiency (%)
90
80
70
60
50
40
30
20
10
0
20
30
70
60
80
90
100
40
50
10
DCP010505B
CONDUCTED EMISSIONS (125% Load)
Emission Level, Peak (dB
A)
Frequency (MHz)
1
0.15
10
30
60
50
40
30
20
10
0
10
20
DCP010505B
CONDUCTED EMISSIONS (8% Load)
Emission Level, Peak (dB
A)
Frequency (MHz)
1
0.15
10
30
60
50
40
30
20
10
0
10
20
7
DCP01B
FIGURE 1. Connecting the DCP01B in Series.
FUNCTIONAL DESCRIPTION
OVERVIEW
The DCP01B offers up to 1W of unregulated output power
with a typical efficiency of up to 85%. 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 pro-
cess.
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 DCP01B 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 DCP01B 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 small variations in
switching frequencies between the DC/DC converters.
The DCP01B overcomes this by allowing devices to be
synchronized to one another. Up to eight devices can be
synchronized by connecting the SYNC
IN
pins together, tak-
ing care to minimize the capacitance of tracking. Stray
capacitance (> 3pF) will have the effect of reducing the
switching frequency, or even stopping the oscillator circuit.
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
IN
pins are driven by an exter-
nal device. Details are contained in a separate applications
bulletin (AB-153).
CONSTRUCTION
The DCP01B's basic construction is the same as standard
ICs. There is no substrate within the molded package. The
DCP01B is constructed using an IC, rectifier diodes, and a
wound magnetic toroid on a leadframe. As there is no solder
within the package, the DCP01B does not require any
special PCB assembly processing. This results in an isolated
DC/DC converter with inherently high reliability.
ADDITIONAL FUNCTIONS
DISABLE/ENABLE
The DCP01B can be disabled or enabled by driving the SYNC
pin using an open drain CMOS gate. If the SYNC
IN
pin is
pulled low, the DCP01B 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 DCP01B to be enabled.
Capacitive loading on the SYNC
IN
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 at least a
1
F capacitor is used on V
OUT
. Dual outputs should both be
decoupled to pin 5. A 2.2
F low ESR capacitor on the input
of the 5V in versions, and a 0.47
F low ESR cap on the 24V
DCP01B in versions is recommended.
DCP
01B
V
OUT 1
V
SUPPLY
V
S
0V
DCP
01B
V
OUT 2
V
OUT1
+ V
OUT 2
SYNC
IN
SYNC
IN
V
S
0V
0V
0V
COM
8
DCP01B
FIGURE 2. Connecting Dual Outputs in Series.
Connecting the DCP01B in Series
Multiple DCP01B isolated 1W DC/DC converters can be
connected in series to provide nonstandard voltage rails.
This is possible by utilizing the floating outputs provided by
the DCP01B's galvanic isolation.
Connect the positive V
OUT
from one DCP01B to the nega-
tive V
OUT
(0V) of another (see Figure 1). If the SYNC
IN
pins
are tied together, the self-synchronization feature of the
DCP01B will prevent beat frequencies on the voltage rails.
The SYNC
IN
feature of the DCP01B allows easy series
connection without external filtering, minimizing cost.
The outputs on dual output DCP01B 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
DCP01B could be connected to provide a 30V rail.
Connecting the DCP01B in Parallel
If the output power from one DCP01B is not sufficient, it is
possible to parallel the outputs of multiple DCP01Bs, as
shown in Figure 3. Again, the SYNC
IN
feature allows easy
synchronization to prevent power-rail beat frequencies at no
additional filtering cost.
PCB LAYOUT
Ripple and Noise
Careful consideration should be given to the layout of the
PCB in order that the best results can be obtained.
The DCP01B is a switching power supply and as such can
place high peak current demands on the input supply. In
order to avoid the supply falling momentarily during the fast
switching pulses ground and power planes should be used to
track the power to the input of DCP01B. If this is not
possible then the supplies must be connected in a star
formation with the tracks made as wide as possible.
If the SYNC
IN
pin is being used then the tracking between
device SYNC
IN
pins should be short to avoid stray capaci-
tance. If the SYNC
IN
pin is not being used it is advisable to
place a guard ring, (connected to input ground) around this
pin to avoid any noise pick up.
The output should be taken from the device using ground
and power planes, this will ensure minimum losses.
A good quality low ESR capacitor placed as close as
practicable across the input will reduce reflected ripple and
ensure a smooth start up.
A good quality low ESR capacitor placed as close as
practicable across the rectifier output terminal and output
ground will give the best ripple and noise performance.
THERMAL MANAGEMENT
Due to the high power density of this device it is advisable
to provide ground planes on the input and output.
FIGURE 3. Connecting Multiple DCP01Bs in Parallel.
DCP
01B
+V
OUT
V
SUPPLY
+V
OUT
V
OUT
V
OUT
0V
V
S
0V
COM
DCP
01B
0V
0V
V
OUT
V
SUPPLY
V
S
0V
DCP
01B
V
OUT
2 x Power Out
SYNC
IN
SYNC
IN
V
S
0V
COM
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