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PDF DCR021205 Data sheet ( Hoja de datos )

Número de pieza DCR021205
Descripción REGULATED DC/DC CONVERTERS
Fabricantes Burr-Brown Corporation 
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No Preview Available ! DCR021205 Hoja de datos, Descripción, Manual

DCR02 SERIES
SBVS028A − DECEMBER 2000 − REVISED APRIL 2004
Miniature, 2W Isolated
REGULATED DC/DC CONVERTERS
FEATURES
D UL1950 Recognized
D DIP-18 and SO-10 Packages
D 55W/in3 (3.3W/cm3) Power Density
D Device-to-Device Synchronization
D Thermal Protection
D 1000Vrms Isolation
D 400kHz Switching
D 125 FITS at 55°C
D Short-Circuit Protection
D 12V, 24V Inputs
D 5V Outputs
APPLICATIONS
D Point-of-Use Power Conversion
D Digital Interface Power
D Ground Loop Elimination
D Power-Supply Noise Reduction
DESCRIPTION
The DCR02 family is a series of high-efficiency,
input-isolated, output-regulated DC/DC converters. In
addition to 2W nominal, galvanically-isolated output power
capability, this range of converters offers very low output
noise and high accuracy.
The DCR02 family is implemented in standard molded IC
packaging, providing standard JEDEC outlines suitable
for high-volume assembly.
The DCR is manufactured using the same technology as
standard IC packages, thereby achieving very high
reliability.
SYNC
VREC
VS
In p u t
C o n tro lle r
LDO
R egulator
ENABLE
ERROR
VOUT
0VIN
0VOUT
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 Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2000−2004, Texas Instruments Incorporated
www.ti.com

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DCR021205 pdf
DCR02 SERIES
www.ti.com
FUNCTIONAL DESCRIPTION
OVERVIEW
The DCR02 series offers isolation from an unregulated
power supply operating from a choice of input voltages.
This series provides a variety of regulated output voltages
at a nominal output power of 2W.
POWER STAGE
The input supply is chopped at a frequency of 400kHz
(internal oscillator divided by 2), which is used to drive the
center-tapped toroidal transformer.
RECTIFICATION
The transformer output is full wave rectified and smoothed
by the external capacitor connected to VREC.
REGULATOR
The internal low-dropout regulator provides a
well-regulated output voltage throughout the operating
range of the device.
OSCILLATOR AND WATCHDOG
The DCR02 uses an internal saw-tooth generator to
provide the 800kHz onboard oscillator that is used to drive
the power switching circuit. The operation of the oscillator
is monitored by the watchdog, which will tri-state the output
driver circuit if the oscillator fails or if the SYNC pin is taken
low (shutdown mode). When the SYNC pin is returned
high, normal operation resumes.
SBVS028A − DECEMBER 2000 − REVISED APRIL 2004
SYNCHRONIZATION
If more than one DCR02 is being used, beat frequencies
and other electrical interference can be generated. This
interference is due to the small variations in switching
frequencies between the converters. The DCR02
overcomes this by allowing devices to be synchronized to
one another. Up to eight devices can be synchronized by
connecting the SYNC pins together, with care being taken
to minimize the capacitance of tracking.
Significant stray capacitance on the SYNC pin reduces the
frequency of the internal oscillator. If this reduction is large,
the DCR02 may be taken out with its optimized operating
parameters, and saturation of the magnetics may result,
damaging the device.
If devices are synchronized, it should be noted that all
devices will draw maximum current simultaneously at start
up. This can cause the input voltage to dip. Should it fall
below the minimum input voltage, the devices may not
start up. A low equivalent series resistance (ESR) 2.2µF
ceramic capacitor should be connected as close to the
device input pins as possible.
If more than eight devices are required to be synchronized,
it is recommended that external synchronization be used.
Details of this procedure are contained in application
report SBAA035, External Synchronization of the
DCP01/02 Series of DC/DC Converters, available for
download at www.ti.com.
CONSTRUCTION
The DCR02 is manufactured using the same technology
as standard IC packages. There is no substrate within the
package. The DCR02 is constructed using a driver IC,
low-dropout voltage regulator, rectifier diodes, and a
wound magnetic toroid, all mounted on a leadframe. The
DCR02 requires no special printed circuit board (PCB)
assembly processing, since there is no solder within the
package. The result is an isolated DC/DC converter with
inherently high reliability.
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DCR021205 arduino
DVS (R-PDSO-G10/18)
MECHANICAL DATA
MPDS113 – OCTOBER 2001
PLASTIC SMALL-OUTLINE PACKAGE
18
Index
Area
1
0.920 (23,37) C
0.880 (22,35)
10
0.280 (7,11)
0.240 (6,10) C
9
0.022 (0,56)
0.014 (0,36)
D 0.070 (1,78)
0.045 (1,14)
Base
Plane
Seating
Plane
0.005 (0,13)
MIN 4 PL
Full Lead C
0.100 (2,54)
0.195 (4,95)
0.115 (2,92)
0.210 (5,33)
MAX
0.043 (1,10)
0.025 (0,65)
0.057 (1,45)
0.045 (1,15)
0.015 (0,38)
MIN
0.420 (10,70)
0.405 (10,30)
CL
0°± 5°
0.325 (8.26)
0.300 (7,62)
0.014 (0,36)
0.008 (0,20)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Dimensions do not include mold flash or protrusions.
Mold flash or protrusions shall not exceed 0.010 (0,25).
D. Maximum dimension does not include dambar
protrusions. Dambar protrusions shall not exceed 0.010 (0,25)
E. Distance between leads including dambar protrusions
to be 0.005 (0,13) minimum.
F. A visual index feature must be located within the
cross–hatched area.
G. For automatic insertion, any raised irregularity on the top
surface (step, mesa, etc.) shall be symmetrical about
the lateral and longitudinal package centerlines.
4203553/B 09/01
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
1

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