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DCP020507U Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer DCP020507U
Beschreibung Miniature/ 2W Isolated UNREGULATED DC/DC CONVERTERS
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 7 Seiten
DCP020507U Datasheet, Funktion
®
For most current data sheet and other
product information, visit www.burr-brown.com
DCP02
DCP02
DCP02
Series
Miniature, 2W Isolated
UNREGULATED DC/DC CONVERTERS
FEATURES
q UP TO 89% EFFICIENCY
q THERMAL PROTECTION
q DEVICE-TO-DEVICE SYNCHRONIZATION
q SO-28(1) POWER DENSITY OF 106W/in3
(6.5W/cm3)
q EN55022 CLASS B EMC PERFORMANCE
q UL1950 RECOGNIZED
q JEDEC 14-PIN AND SO-28(1) PACKAGES
APPLICATIONS
q POINT-OF-USE POWER CONVERSION
q GROUND LOOP ELIMINATION
q DATA ACQUISITION
q INDUSTRIAL CONTROL AND
INSTRUMENTATION
q TEST EQUIPMENT
DESCRIPTION
The DCP02 series is a family of 2W, unregulated,
isolated 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 switch-
ing frequencies.
The use of a highly integrated package design results
in highly reliable products with power densities of
79W/in3 (4.8W/cm3) for the 14-PDIP, and 106W/in3
(6.5W/cm3) for the SO-28(1). This combination of
features and small size makes the DCP02 suitable for
a wide range of applications.
NOTE: (1) SO-28 version available January, 2000.
SYNC/DISABLE
800kHz
Oscillator
÷2
Reset
Watch-dog/
start-up
Power
Stage
VOUT
0V
PSU
Thermal
Shutdown
IBIAS
VS
Power Controller IC
0V
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
©1999 Burr-Brown Corporation
PDS-1558A
Printed in U.S.A. December, 1999






DCP020507U Datasheet, Funktion
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 2µs.
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 2.2µF 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.
VSUPPLY
COM
VS VOUT 1
SYNC DCP 02
0V 0V
VS VOUT 2
SYNC DCP 02
0V 0V
FIGURE 1. Connecting the DCP02 in Series.
®
DCP02
6
VOUT1 + VOUT 2

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