TEXAS INSTRUMENTS DCP01B Technical data

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®

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DCP01

DCP01

Miniature, 1W Isolated

UNREGULATED DC/DC CONVERTERS

FEATURES

● UP TO 85% EFFICIENCY

● THERMAL PROTECTION

● DEVICE-TO-DEVICE SYNCHRONIZATION

● SHORT CIRCUIT PROTECTION

● EN55022 CLASS B EMC PERFORMANCE

● UL1950 RECOGNIZED COMPONENT

● JEDEC PDIP-14 AND GULL-WING PACKAGES

DCP01B

Series

APPLICATIONS

● POINT-OF-USE POWER CONVERSION

● GROUND LOOP ELIMINATION

● DATA ACQUISITION

● INDUSTRIAL CONTROL AND

INSTRUMENTATION

● TEST EQUIPMENT

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 switch­ing frequencies.

The use of a highly integrated package design results
in highly reliable products with a power density of
40W/in3 (2.4W/cm3). This combination of features
and small size makes the DCP01B suitable for a wide
range of applications.

SYNC

OUT

800kHz

Oscillator

SYNC

IN

V

S

Power Controller IC

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone]

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

©

2000 Burr-Brown Corporation PDS-1586B Printed in U.S.A. May, 2000

÷ 2

Reset

Watch-dog/

start-up

PSU

Thermal

Shutdown

V

Power

Stage

I

BIAS

0V

1

OUT

0V

DCP01B

®

SPECIFICATIONS

At TA = +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 = 1µF, 50% Load 20 mVp-p
Voltage vs Temp Room to Cold 0.046 %/°C

INPUT

Voltage Range on V

ISOLATION

Voltage 1s Flash Test 1 kVrms

LINE

Regulation 1 %/1% of V

SWITCHING/SYNCHRONIZATION

Oscillator Frequency (f
Sync Input Low 0 0.4 V
Sync Input Current V
Disable Time 2 µs
Capacitance Loading on SYNC

RELIABILITY

Demonstrated T

THERMAL SHUTDOWN

IC Temperature at Shutdown 150 °C
Shutdown Current 3mA

TEMPERATURE RANGE

Operating –40 +100 °C

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
at 75% Load.

S

) Switching Frequency = f

OSC

Pin External 3 pF

IN

INPUT OUTPUT LOAD NO LOAD BARRIER

VOLTAGE (V) VOLTAGE (V) REGULATION (%) CURRENT (mA) EFFICIENCY (%) CAPACITANCE (pF)

V

S

V

NOM

75% LOAD

Room to Hot 0.016 %/°C

–10 10 %

60s Test, UL1950

SYNC

= +55°C 75 FITS

A

(2)

10% TO 100% LOAD

(1)

/2 800 kHz

OSC

= +2V 75 µA

(3)

TYP. (3) Load regulation = (V

NOM

1 kVrms

I

Q

0% LOAD 100% LOAD V

at 10% Load – V

OUT

OUT

C

ISO

= 750V

ISO

at 100% Load)/ V

RMS

S

OUT

ABSOLUTE MAXIMUM RATINGS

Input Voltage:

5V Input Models .................................................................................. 7V

24V Input Models .............................................................................. 29V

Storage Temperature...................................................... –60°C to +125°C

Lead Temperature (soldering, 10s) ................................................. 270°C

ORDERING INFORMATION

(D )

Basic Model Number: 1W Product

DCP01 ( B)

Voltage Input:

5V In

Voltage Output:

5V Out
Dual Output:
Model Revision:
Package Code:

P = PDIP-14

P-U = PDIP-14 Gull-Wing

®

05

05

DCP01B

()

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 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.

2

PIN CONFIGURATION (Single-DIP and Gull-Wing)

PIN CONFIGURATION (Dual-DIP and Gull-Wing)

Top View DIP

V
0V

1

S

2

14

SYNC

IN

DCP01B

5

0V

6

+V

OUT

NC

7

8

SYNC

OUT

PIN DEFINITION (Single-DIP)

PIN # PIN NAME DESCRIPTION

1V
2 0V Input Side Common

S

5 0V Output Side Common
6+V
7 NC Not Connected
8 SYNC
14 SYNC

OUT

OUT

Voltage Input

+Voltage Out

Unrectified Transformer Output
Synchronization Pin

IN

Top View DIP

V
0V

1

S

2

14

SYNC

IN

DCP01DB

5

0V

6

+V

OUT

–V

OUT

7

8

SYNC

OUT

PIN DEFINITION (Dual-DIP)

PIN # PIN NAME DESCRIPTION

1V
2 0V Input Side Common

S

5 0V Output Side Common
6+V
7–V
8 SYNC
14 SYNC

OUT
OUT

OUT

Voltage Input

+Voltage Out
–Voltage Out
Unrectified Transformer Output
Synchronization Pin

IN

PACKAGE/ORDERING INFORMATION

PACKAGE SPECIFIED

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

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.

(1)

MEDIA

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.

3

DCP01B

®

TYPICAL PERFORMANCE CURVES

At TA = +25°C, unless otherwise noted.

50
45
40
35
30
25
20

Ripple (mVp-p)

15
10

5
0

5.8

5.7

5.6

5.5

5.4

5.3

(V)

5.2

OUT

V

5.1

5.0

4.9

4.8

4.7

OUTPUT RIPPLE vs LOAD (20MHz BW)

DCP010505B

1µF Ceramic

4.7µF Ceramic
10µF Ceramic

20 30 50 7060 80 90 1004010

Load (%)

DCP010505B V

vs LOAD

OUT

Load (%)

5.5

DCP010505B V

OUT

vs V

S

5.4

5.3

5.2

5.1

5.0

(V)

4.9

OUT

V

4.8

4.7

4.6

4.5

4.4

4.6 4.7 4.9 5.15.0 5.2 5.45.3 5.54.84.5
VS (V)

DCP010505B EFFICIENCY vs LOAD

85

80

75

70

Efficiency (%)

65

60

55

10010 20 30 40 50 60 70 80 90

10010 20 30 40 50 60 70 80 90

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

DCP010505DB V

®

DCP01B

Load (%)

vs LOAD

OUT

+V
–V

OUT

OUT

85

DCP010505DB EFFICIENCY vs LOAD

80

75

70

Efficiency (%)

65

60

55

10010 20 30 40 50 60 70 80 90

10010 20 30 40 50 60 70 80 90

Load (%)

4

TYPICAL PERFORMANCE CURVES (Cont.)

DCP010515B V

OUT

vs LOAD

Load (%)

V

OUT

(V)

18

17.5
17

16.5
16

15.5
15

14.5
14

10010 20 30 40 50 60 70 80 90

At TA = +25°C, unless otherwise noted.

(V)

OUT

V

14.5

13.5

(V)

OUT

12.5

V

11.5

14.5

14.0

13.5

13.0

12.5

12.0

11.5

11.0

10.5

10.00

DCP010512B V

14

OUT

vs LOAD

90
85

DCP010512B EFFICIENCY vs LOAD

80

13

75
70
65

12

Efficiency (%)

60
55

11

10010 20 30 40 50 60 70 80 90

Load (%)

DCP010512DB V

vs LOAD

OUT

50

10010 20 30 40 50 60 70 80 90

Load (%)

DCP010512DB EFFICIENCY vs LOAD

85

80

75

70

65

Efficiency (%)

60

+V
–V

OUT
OUT

55

50

20 30 50 7060 80 90 1004010

Load (%)

20 30 50 7060 80 90 1004010

Load (%)

85

DCP010515B EFFICIENCY vs LOAD

80

75

70

65

Efficiency (%)

60

55

50

10010 20 30 40 50 60 70 80 90

Load (%)

®

5

DCP01B

TYPICAL PERFORMANCE CURVES (Cont.)

DCP010515DB EFFICIENCY vs LOAD

Load (%)

Efficiency (%)

90
85
80
75
70
65
60
55
50

20 30 50 7060 80 90 1004010

DCP010505B

CONDUCTED EMISSIONS (8% Load)

Emission Level, Peak (dBµA)

Frequency (MHz)

10.15 10 30

60
50
40
30
20
10

0
–10
–20

At TA = +25°C, unless otherwise noted.

(V)

OUT

V

(V)

OUT

V

5.60

5.50

5.40

5.30

5.20

5.10

5.00

4.90

4.80

+V
–V

20 30 50 7060 80 90 1004010

20 30 6050 70 80 1004010

DCP010515DB V

OUT
OUT

Load (%)

DCP012405B V

Load (%)

18

17

16

15

14

OUT

vs LOAD

OUT

vs LOAD

90
80
70
60
50
40

Efficiency (%)

30
20
10

0

DCP012405B EFFICIENCY vs LOAD

20 30 7060 80 90 10040 5010

Load (%)

60
50
40
30
20
10

0

Emission Level, Peak (dBµA)

–10
–20

CONDUCTED EMISSIONS (125% Load)

10.15 10 30
Frequency (MHz)

®

DCP01B

DCP010505B

6

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 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 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 2µs.

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 SYNCIN pins together, tak­ing 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 simulta­neously. 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 2.2µF capacitor should be connected
close to the input pins.

If more than eight devices are to be synchronized, it is
recommended that the SYNCIN pins are driven by an exter­nal 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 SYNCIN pin is
pulled low, the DCP01B 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 DCP01B to be enabled.

Capacitive loading on the SYNCIN 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
1µF capacitor is used on V
decoupled to pin 5. A 2.2µF low ESR capacitor on the input
of the 5V in versions, and a 0.47µF low ESR cap on the 24V
DCP01B in versions is recommended.

. Dual outputs should both be

OUT

V

SUPPLY

COM

FIGURE 1. Connecting the DCP01B in Series.

V

S

SYNC

0V

V

S

SYNC

0V

DCP 01B

IN

DCP 01B

IN

V

OUT 1

0V

V

+ V

OUT1

V

OUT 2

0V

7

OUT 2

DCP01B

®

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
tive V

(0V) of another (see Figure 1). If the SYNCIN pins

OUT

from one DCP01B to the nega-

OUT

are tied together, the self-synchronization feature of the
DCP01B will prevent beat frequencies on the voltage rails.
The SYNCIN 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

as shown in Figure 2. For example, a dual 15V

OUT

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 SYNCIN 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 SYNCIN pin is being used then the tracking between
device SYNCIN pins should be short to avoid stray capaci­tance. If the SYNCIN 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.

V

SUPPLY

COM

FIGURE 2. Connecting Dual Outputs in Series.

V

SUPPLY

V

S

0V

V

S

SYNC

0V

V

S

SYNC

0V

DCP 01B

DCP 01B

IN

DCP 01B

IN

+V

–V

+V

OUT

OUT

0V

V

OUT

0V

V

OUT

0V

OUT

–V

OUT

2 x Power Out

COM

FIGURE 3. Connecting Multiple DCP01Bs in Parallel.

®

DCP01B

8