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PDF ( 数据手册 , 数据表 ) DCR021205P

零件编号 DCR021205P
描述 REGULATED DC/DC CONVERTERS
制造商 Burr-Brown Corporation
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DCR021205P 数据手册, 描述, 功能
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
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DCR021205P pdf, 数据表
DCR02 SERIES
SBVS028A − DECEMBER 2000 − REVISED APRIL 2004
GENERATION OF DUAL POLARITY
VOLTAGES FROM TWO
SELF-SYNCHRONIZED DCR02s
Two DCR02s can be configured to produce a dual polarity
supply (that is, ±5V); the circuit must be connected as
shown in Figure 3.
It should be observed that both DCR02s are positive
voltage regulators; therefore the ERROR, ENABLE, and
VREC pins are relative to their respective devices, 0V, and
must not be connected together.
PCB LAYOUT
RIPPLE AND NOISE
Careful consideration should be given to the layout of the
PCB in order for the best results to be obtained.
The DCR02 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 DCR02; this will also
serve to reduce noise on the circuit. If this is not possible,
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the supplies must be connected in a star formation, with
the tracks made as wide as possible.
If the SYNC pin is being used, the tracking between device
SYNC pins should be short, to avoid stray capacitance. If
the SYNC pin is not being used, it is advisable to place a
guard ring (connected to input ground) around this pin to
avoid any noise pickup.
The output should be taken from the device using ground
and power planes. This will ensure minimum losses.
A good quality, low ESR ceramic capacitor placed as close
as practical across the input will reduce reflected ripple
and ensure a smooth startup.
Additionally, a good quality, low ESR ceramic capacitor
placed as close as practical across the rectifier output
terminal and output ground will also give the best ripple
and noise performance.
THERMAL MANAGEMENT
Due to the high power density of this device, it is advisable
to provide a ground plane on the output. The output
regulator is mounted on a copper leadframe, and a ground
plane will serve as an efficient heatsink.
U1
VIN VS
VOUT
CIN(1)
SYNC
0V
DCR
ERROR
02 VREC
ENABLE
0V
U2
VIN VS
VOUT
CIN(1)
SYNC
0V
DCR
ERROR
02 VREC
ENABLE
0V
CFILTER
1µF
COUT
0.1µF
VPOS O/P
0V
CFILTER
1µF
COUT
0.1µF
VNEG O/P
NOTE: (1) Required 2.2µF low ESR ceramic capacitor.
Figure 3. Dual Polarity Voltage Generation from Two Self-Synchronized DCR02s
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