Burr-Brown DCR011205 Miniature, 1w isolated regulated dc/dc converter Datasheet

DCR01
Series
®
DCR
01
DCR
01
For most current data sheet and other
product information, visit www.burr-brown.com
Miniature, 1W Isolated
REGULATED DC/DC CONVERTERS
FEATURES
APPLICATIONS
● UL1950 RECOGNIZED
●
●
●
●
● PDIP-18,
SO-28(1)
● 53W/in3 (3.3W/cm3) POWER DENSITY
● DEVICE-TO-DEVICE SYNCHRONIZATION
POINT-OF-USE POWER CONVERSION
DIGITAL INTERFACE POWER
GROUND LOOP ELIMINATION
POWER-SUPPLY NOISE REDUCTION
● THERMAL PROTECTION
● 1000Vrms ISOLATION
DESCRIPTION
● 400kHz SWITCHING
DCR01 family is a series of high-efficiency, inputisolated, output-regulated DC/DC converters. In addition to 1W nominal, galvanically-isolated output power
capability, this range of DC/DCs offer very low output noise, thermal protection and high accuracy.
The DCR01 family is implemented in standard molded
IC packaging, giving standard JEDEC outlines suitable for high-volume assembly.
The DCR01 is manufactured using the same technology as standard IC packages, thereby achieving very
high reliability.
● 125 FITS AT 55°C
● ±10% INPUT RANGE
● SHORT-CIRCUIT PROTECTED
● 5V, 12V, 24V INPUTS
● 3.3V, 5V OUTPUTS
● HIGH EFFICIENCY
NOTE: (1) SO version available Q3 2000.
VREC
SYNC
ENABLE
VS
Input
Controller
LDO
Regulator
ERROR
VOUT
0V
0V
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©
2000 Burr-Brown Corporation
PDS-1587A
Printed in U.S.A. May, 2000
SPECIFICATIONS
At TA = +25°C, VS = nominal, IO = 10mA, CO = 0.1µF, unless otherwise specified.
DCR01 SERIES
PARAMETER
CONDITIONS
OUTPUT
Setpoint
DCR010503
DCR010505
DCR011203(2)
DCR011205(2)
DCR012403(3)
DCR012405(3)
Setpoint Accuracy
Maximum Output Current
DCR010503
DCR010505
DCR011203(2)
DCR011205(2)
DCR012403(3)
DCR012405(3)
Output Short-Circuit Protected
Line Regulation
DCR010503
DCR010505
DCR011203(2)
DCR011205(2)
DCR012403(3)
DCR012405(3)
Over Line and Load
DCR010503
DCR010505
DCR011203
DCR011205
DCR012403
DCR012405
Versus Temperature
Ripple and Noise
DCR0105 Ripple
DCR0105 Noise
INPUT
Nominal Voltage (VS)
Voltage Range
Supply Current
DCR010503
MIN
TYP
3.3
5
3.3
5
3.3
5
0.5
DCR011203(2)
DCR011205(2)
DCR012403(3)
DCR012405(3)
Reflected Ripple Current
DCR010503, DCR01505
Duration
2.0
V
V
V
V
V
V
%
mA
mA
mA
mA
mA
mA
Infinite
1
1
1
1
1
1
10mA to 300mA Load, 4.5V to
10mA to 200mA Load, 4.5V to
10mA to 390mA Load, 10.8V to
10mA to 200mA Load, 10.8V to
10mA to 390mA Load, 21.6V to
10mA to 200mA Load, 21.6V to
–40°C to +85°C
5.5V Line
5.5V Line
13.2V Line
13.2V Line
26.4V Line
26.4V Line
1.0
1.0
1.0
1.0
1.0
1.0
1.0
20MHz Bandwidth, 50% Load
CIN = 2.2µF, CFILTER = 1µF, COUT = 0.1µF
100MHz Bandwidth, 50% Load
CIN = 2.2µ, CFILTER = 1µF, COUT = 0.1µF
DCR0105xx
DCR0112xx
DCR0124xx
mV/V
mV/V
mV/V
mV/V
mV/V
mV/V
2.5
2.5
2.5
2.5
2.5
2.5
%
%
%
%
%
%
%
5
mVp-p
35
mVp-p
5
12
24
V
V
V
%
+10
IO = 0mA
IO = 10mA
IO = 300mA
IO = 0mA
IO = 10mA
IO = 200mA
IO = 0mA
IO = 10mA
IO = 390mA
IO = 0mA
IO = 10mA
IO = 200mA
IO = 0mA
IO = 10mA
IO = 390mA
IO = 0mA
IO = 10mA
IO = 200mA
18
28
335
25
40
310
13
17
173
13
18
125
15
17
94
15
17
71
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
MHz Bandwidth, 100% Load
CIN = 2.2µF, CFILTER = 1µF
8
mAp-p
®
DCR01
UNITS
300
200
390
200
390
200
–10
DCR010505
MAX
2
SPECIFICATIONS
(Cont.)
At TA = +25°C, VS = nominal, IO = 10mA, CO = 0.1µF, unless otherwise specified.
DCR01 SERIES
PARAMETER
ISOLATION
Voltage
CONDITIONS
MIN
1s Flash Test
60s Test, UL1950(1)
1
1
Input/Output Capacitance
TYP
MAX
kVrms
kVrms
pF
25
OUTPUT ENABLE CONTROL
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
DCR010503
DCR010505
2.0
2.0 < VENABLE < VREC
VREC
100
–0.2
0 < VENABLE < 0.5
ERROR FLAG
Logic High Open Collector Leakage
Logic Low Output Voltage
0.5
100
VERROR = 5V
Sinking 2mA
10
0.4
THERMAL SHUTDOWN
Junction Temperature
Temperature Activated
Temperature Deactivated
720
720
2.5
0
TEMPERATURE RANGE
Operating
–40
800
2.5
V
nA
V
nA
V
V
µA
V
°C
°C
150
130
SYNCHRONIZATION PIN
Max External Capacitance on SYNC Pin
Internal Oscillator Frequency
External Synchronization Frequency
External Synchronization Signal High
External Synchronization Signal Low
UNITS
3
880
880
5.0
0.4
pF
kHz
kHz
V
V
+85
°C
NOTES: (1) During UL approval only. (2) DCR011203, DCR011205 available Q2 2000. (3) DCR0112403, DCR012405 available Q3 2000.
ELECTROSTATIC
DISCHARGE SENSITIVITY
ABSOLUTE MAXIMUM RATINGS
Input Voltage:
DCR0105 ............................................................................................ 7V
DCR0112 .......................................................................................... 15V
DCR0124 .......................................................................................... 29V
Storage Temperature ...................................................... –60°C to +125°C
Lead Temperature (soldering, 10s) ................................................. 270°C
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.
ORDERING INFORMATION
DCR01
Basic Model Number: 1W Product
Voltage Input:
5V In
Voltage Output:
5V Out
Package Code:
P = 18-Pin Plastic DIP, U = 28-Pin SO(1)
05
05
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.
(P)
NOTE: (1) SO version available Q3 2000.
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
DCR01
PACKAGE/ORDERING INFORMATION
PACKAGE
PACKAGE
DRAWING
NUMBER
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER(1)
TRANSPORT
MEDIA
DCR010503P
PDIP-18
218-1
–40°C to +85°C
DCR010503P
DCR010503P
Rails
DCR010505P
PDIP-18
218-1
–40°C to +85°C
DCR010505P
DCR010505P
Rails
SO-28
217-2
–40°C to +85°C
DCR010503U
DCR010503U/1K
Tape and Reel
DCR010505U(3)
SO-28
217-2
–40°C to +85°C
DCR010505U
DCR010505U/1K
Tape and Reel
DCR011203P(2)
PDIP-18
218-1
–40°C to +85°C
DCR011203P
DCR011203P
Rails
SO-28
217-2
–40°C to +85°C
DCR011203U
DCR011203U/1K
Tape and Reel
PRODUCT
DCR010503U(3)
DCR011203U(1, 3)
DCR011205P(2)
DCR011205U(1, 3)
DCR012403P(3)
DCR012403U(1, 3)
DCR012405P(3)
DCR012405U(1, 3)
PDIP-18
218-1
–40°C to +85°C
DCR011205P
DCR011205P
Rails
SO-28
217-2
–40°C to +85°C
DCR011205U
DCR011205U/1K
Tape and Reel
PDIP-18
218-1
–40°C to +85°C
DCR012403P
DCR012403P
Rails
SO-28
217-2
–40°C to +85°C
DCR012403U
DCR012403U/1K
Tape and Reel
PDIP-18
218-1
–40°C to +85°C
DCR012405P
DCR012405P
Rails
SO-28
217-2
–40°C to +85°C
DCR012405U
DCR012405U/1K
Tape and Reel
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /1K indicates 1000 devices per reel). Ordering 1000 pieces
of “DCR010503U/1K” will get a single 1000-piece Tape and Reel. (2) Available Q2 2000. (3) Available Q3 2000.
PIN CONFIGURATIONS
Top View
SO
PDIP
VS
1
18 SYNC
VS
1
28 SYNC
NC
2
17 0VIN
VS
2
27 0VIN
NC
3
26 0VIN
DCR01
DCR01U
VREC
7
12 ERROR
VREC 12
17 ERROR
0VOUT
8
11 ENABLE
0VOUT 13
16 ENABLE
VO
9
10 DNC
15 DNC
VO 14
PIN DEFINITION (PDIP)
PIN DEFINITION (SO)
PIN #
PIN NAME
DESCRIPTION
PIN #
PIN NAME
1
VS
Voltage Input
1
VS
Voltage Input
2
NC
No Connection
2
VS
Voltage Input
7
VREC
Rectified Output
3
NC
No Connection
8
0VOUT
Output Ground
12
VREC
Rectified Output
Output Ground
DESCRIPTION
9
VO
Voltage Output
13
VOUT
10
DNC
Do Not Connect
14
VO
Voltage Output
11
ENABLE
Output Voltage Enable
15
DNC
Do Not Connect
12
ERROR
17
0VIN
18
SYNC
Error Flag Active Low
16
ENABLE
Input Ground
17
ERROR
Synchronization Input
26
0VIN
NOTE: (1) SO version available Q3 2000.
®
DCR01
4
27
0VIN
28
SYNC
Output Voltage Enable
Error Flag Active Low
Input Ground
Input Ground
Synchronization Input
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = 5V, IO = 10mA, CO = 0.1µF, unless otherwise specified.
DCR0105 OUTPUT NOISE (100MHz Bandwidth)
80
12
70
60
10
Noise (mVp-p)
Ripple Voltage (mVp-p)
DCR0105 OUTPUT VOLTAGE RIPPLE
14
8
6
4
40
30
20
2
10
0
0
0
20
40
60
80
0
100
20
40
60
80
Load (%)
Load (%)
DCR010503P EFFICIENCY
(VIN = 5V)
DCR010503P VOUT vs LOAD
(VIN = 5V)
100
3.305
70
85°C
85°C
3.3
60
3.295
50
VOUT (V)
–40°C
40
25°C
30
20
3.29
3.285
25°C
3.28
3.275
10
3.27
0
3.265
–40°C
10
20
30
40
50
60
70
80
90
0
100
10
20
30
40
50
60
70
Load (%)
Load (%)
DCR0105 SERIES INPUT CURRENT
REFLECTED NOISE (100MHz Bandwidth)
DCR0105 SERIES INPUT
CURRENT REFLECTED RIPPLE
80
90
100
20mA/div
0
40mA/div
Efficiency (%)
50
500ns/div
500ns/div
®
5
DCR01
TYPICAL PERFORMANCE CURVES
(Cont.)
At TA = +25°C, VS = 5V, IO = 10mA, CO = 0.1µF, unless otherwise specified.
DCR010503P LOAD TRANSIENT RESPONSE
DCR010503P LOAD TRANSIENT RESPONSE
150mA Changing
to 300mA
30mA Changing
to 325mA
Load Current
Load Current
200mV/div
200mV/div
Output Voltage
Output Voltage
10µs/div
10µs/div
DCR010503P OUTPUT VOLTAGE NOISE
AT 100% LOAD (100MHz Bandwidth)
DCR010503P OUTPUT VOLTAGE RIPPLE
AT 100% LOAD (20MHz Bandwidth)
5mV/div
20mV/div
Load Current
Output Voltage
200ns/div
200ns/div
DCR010505P LOAD TRANSIENT RESPONSE
DCR010505P LOAD TRANSIENT RESPONSE
100mA Changing
to 200mA
200mV/div
200mV/div
20mA Changing
to 200mA
Load Current
Output Voltage
10µs/div
Output Voltage
10µs/div
®
DCR01
Load Current
6
TYPICAL PERFORMANCE CURVES
(Cont.)
At TA = +25°C, VS = 5V, IO = 10mA, CO = 0.1µF, unless otherwise specified.
DCR010505P OUTPUT VOLTAGE NOISE
AT 100% LOAD (100MHz Bandwidth)
5mV/div
20mV/div
DCR010505P OUTPUT VOLTAGE RIPPLE
AT 100% LOAD (20MHz Bandwidth)
200ns/div
200ns/div
The DCR01 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 will have the
effect of reducing the frequency of the internal oscillator. If
this is large, the DCR01 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 2.2µF capacitor (low ESR) should be connected as
close to the device input pins as possible for the 5V input
devices and a 0.47µF capacitor for the 12V and 24V devices.
If more than eight devices are required to be synchronized,
it is recommended that external synchronization be used.
Details are contained in Burr-Brown’s Application Bulletin
AB-153.
FUNCTIONAL DESCRIPTION
OVERVIEW
The DCR01 series offers isolation from an unregulated
power supply operating from a choice of input voltages. The
DCR01’s provide a variety of regulated output voltages at a
nominal output power of 1W or above.
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’s output is full wave rectified and smoothed
by the external capacitor connected to VREC.
REGULATOR
The internal low drop-out regulator provides a well-regulated output voltage, throughout the operating range of the
device.
CONSTRUCTION
The DCR01 is manufactured using the same technology as
standard IC packages. There is no substrate within the
package. The DCR01 is constructed using a driver IC, Low
Dropout Voltage Regulator, rectifier diodes and a wound
magnetic toroid, all mounted on a leadframe. The DCR01
requires no special PCB assembly processing, as there is no
solder within the package. The result is an isolated DC/DC
converter with inherently high reliability.
OSCILLATOR AND WATCHDOG
The DCR01 uses an internal saw-tooth generator to provide
the 800kHz on-board 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.
ADDITIONAL FUNCTIONS
SYNCHRONIZATION
DISABLE/ENABLE
If more than one DCR01 is being used, beat frequencies and
other electrical interference can be generated. This is due to
the small variations in switching frequencies between the
converters.
The DCR01 can be disabled or enabled by driving the SYNC
pin using an open drain CMOS gate. If the SYNC pin is
®
7
DCR01
It is recommended that a 0.1µF low ESR capacitor is
connected close to the output pin and ground to reduce noise
on the output. The capacitor values listed are minimum
values. If lower ripple is required then the filter capacitor
should be increased in value to 0.47µF.
NOTE: As with all switching power supplies the best
performance is only obtained with low ESR capacitors
connected close to the switcher. If low ESR capacitors are
not used, the ESR will generate a voltage drop when the
capacitor is supplying the load power. Often a larger capacitor is chosen for this purpose when a low ESR smaller
capacitance would perform as well.
pulled low, the DCR01 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 enable the DCR01.
Capacitance loading on the SYNC pin should be minimized
in order to prevent a reduction in the internal oscillator‘s
frequency. See Application Bulletin AB-153 External Synchronization of the DCP01/02 Series of DC/DC Converters.
This document contains information on how to null the
effects of additional capacitance on the sync pin. The oscillators frequency can be measured at VREC, as this is the
fundamental frequency of the ripple component.
PCB LAYOUT
OUTPUT ENABLE/DISABLE
RIPPLE AND NOISE
The regulated output of the DCR01 can be disabled by
pulling the ENABLE pin low. Holding the ENABLE pin
high enables the regulated output voltage, thus allowing the
output to be controlled from the isolated side.
Careful consideration should be given to the layout of the
PCB in order for the best results to be obtained.
The DCR01 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 DCR01, this will also serve
to reduce noise on the circuit. If this is not possible, 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 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.
ERROR FLAG
The DCR01 has an Error pin which provides a ‘power good’
flag, as long as the internal regulator is in regulation.
DECOUPLING
Ripple Reduction
Due to the very low forward resistance of the DMOS
switching transistors, high current demands are placed upon
the input supply for a short time. By using a good quality
low Equivalent Series Resistance (ESR) capacitor of 2.2µF
(minimum) for the 5V input devices and a 0.47µF capacitor
for the 12V and 24V devices, placed close to the IC supply
input pins, the effects on the power supply can be minimized.
The high switching frequency of 400kHz allows relatively
small values of capacitors to be used for filtering the rectified output voltage. A good quality low ESR capacitor of
1µF placed close to the VREC pin and output ground will
reduce the ripple.
It is not recommended that the DCR01 be fitted using an
IC socket as this will degrade performance.
The output at VREC is full wave rectified and produces a
ripple of 800kHz.
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.
®
DCR01
8
VIN
VS
CIN(1)
VOUT
DCR
COUT = 0.1µF
01
VREC
0V
VO1
0V
0 VOUT
CFILTER = 1µF
NOTE: (1) 2.2µF capacitor with low ESR for 5V
devices and 0.47µF for 12V and 24V devices.
FIGURE 1. DCR01 with a Single Output.
VIN
VS
CIN(1)
SYNC
VOUT
DCR
COUT = 0.1µF
01
VREC
0V
VO1
0V
0 VOUT
CFILTER = 1µF
0 VOUT
VIN
VS
CIN(1)
SYNC
VOUT
DCR
COUT = 0.1µF
01
VREC
0V
VO2
0V
0 VOUT
CFILTER = 1µF
0 VOUT
NOTE: (1) 2.2µF capacitor with low ESR for 5V
devices and 0.47µF for 12V and 24V devices.
FIGURE 2. Self-Synchronizing DCR01s with a Dual Output.
®
9
DCR01
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