DCR01505 - Burr-Brown / Texas Instruments

Miniature, 1W Isolated

REGULATED DC/DC CONVERTERS

DCR01

Series

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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

For most current data sheet and other

product information, visit www.burr-brown.com

FEATURES

●UL1950 RECOGNIZED

●PDIP-18, SO-28(1)

●53W/in3 (3.3W/cm3) POWER DENSITY

●DEVICE-TO-DEVICE SYNCHRONIZATION

●THERMAL PROTECTION

●1000Vrms ISOLATION

●400kHz SWITCHING

●125 FITS AT 55°C

●±10% INPUT RANGE

●SHORT-CIRCUIT PROTECTED

●5V, 12V, 24V INPUTS

●3.3V, 5V OUTPUTS

●HIGH EFFICIENCY

DESCRIPTION

DCR01 family is a series of high-efficiency, input-

isolated, output-regulated DC/DC converters. In addi-

tion to 1W nominal, galvanically-isolated output power

capability, this range of DC/DCs offer very low out-

put noise, thermal protection and high accuracy.

The DCR01 family is implemented in standard molded

IC packaging, giving standard JEDEC outlines suit-

able for high-volume assembly.

The DCR01 is manufactured using the same technol-

ogy as standard IC packages, thereby achieving very

high reliability.

NOTE: (1) SO version available Q3 2000.

APPLICATIONS

●POINT-OF-USE POWER CONVERSION

●DIGITAL INTERFACE POWER

●GROUND LOOP ELIMINATION

●POWER-SUPPLY NOISE REDUCTION

Input

Controller LDO

Regulator

ENABLE

REC

SYNC

ERROR

OUT

0V 0V

DCR01

SPECIFICATIONS

At TA = +25°C, VS = nominal, IO = 10mA, CO = 0.1µF, unless otherwise specified.

DCR01 SERIES

PARAMETER CONDITIONS MIN TYP MAX UNITS

OUTPUT

Setpoint

DCR010503 3.3 V

DCR010505 5V

DCR011203(2) 3.3 V

DCR011205(2) 5V

DCR012403(3) 3.3 V

DCR012405(3) 5V

Setpoint Accuracy 0.5 2.0 %

Maximum Output Current

DCR010503 300 mA

DCR010505 200 mA

DCR011203(2) 390 mA

DCR011205(2) 200 mA

DCR012403(3) 390 mA

DCR012405(3) 200 mA

Output Short-Circuit Protected Duration Infinite

Line Regulation

DCR010503 1 mV/V

DCR010505 1 mV/V

DCR011203(2) 1 mV/V

DCR011205(2) 1 mV/V

DCR012403(3) 1 mV/V

DCR012405(3) 1 mV/V

Over Line and Load

DCR010503 10mA to 300mA Load, 4.5V to 5.5V Line 1.0 2.5 %

DCR010505 10mA to 200mA Load, 4.5V to 5.5V Line 1.0 2.5 %

DCR011203 10mA to 390mA Load, 10.8V to 13.2V Line 1.0 2.5 %

DCR011205 10mA to 200mA Load, 10.8V to 13.2V Line 1.0 2.5 %

DCR012403 10mA to 390mA Load, 21.6V to 26.4V Line 1.0 2.5 %

DCR012405 10mA to 200mA Load, 21.6V to 26.4V Line 1.0 2.5 %

Versus Temperature –40°C to +85°C 1.0

Ripple and Noise

DCR0105 Ripple 20MHz Bandwidth, 50% Load 5 mVp-p

CIN = 2.2µF, CFILTER = 1µF, COUT = 0.1µF

DCR0105 Noise 100MHz Bandwidth, 50% Load 35 mVp-p

CIN = 2.2µ, CFILTER = 1µF, COUT = 0.1µF

INPUT

Nominal Voltage (VS) DCR0105xx 5 V

DCR0112xx 12 V

DCR0124xx 24 V

Voltage Range –10 +10 %

Supply Current

DCR010503 IO = 0mA 18 mA

IO = 10mA 28 mA

IO = 300mA 335 mA

DCR010505 IO = 0mA 25 mA

IO = 10mA 40 mA

IO = 200mA 310 mA

DCR011203(2) IO = 0mA 13 mA

IO = 10mA 17 mA

IO = 390mA 173 mA

DCR011205(2) IO = 0mA 13 mA

IO = 10mA 18 mA

IO = 200mA 125 mA

DCR012403(3) IO = 0mA 15 mA

IO = 10mA 17 mA

IO = 390mA 94 mA

DCR012405(3) IO = 0mA 15 mA

IO = 10mA 17 mA

IO = 200mA 71 mA

Reflected Ripple Current

DCR010503, DCR01505 MHz Bandwidth, 100% Load 8 mAp-p

CIN = 2.2µF, CFILTER = 1µF

DCR01

ISOLATION

Voltage 1s Flash Test 1 kVrms

60s Test, UL1950(1) 1 kVrms

Input/Output Capacitance 25 pF

OUTPUT ENABLE CONTROL

Logic High Input Voltage 2.0 VREC V

Logic High Input Current 2.0 < VENABLE < VREC 100 nA

Logic Low Input Voltage –0.2 0.5 V

Logic Low Input Current 0 < VENABLE < 0.5 100 nA

DCR010503 V

DCR010505 V

ERROR FLAG

Logic High Open Collector Leakage VERROR = 5V 10 µA

Logic Low Output Voltage Sinking 2mA 0.4 V

THERMAL SHUTDOWN

Junction Temperature

Temperature Activated 150 °C

Temperature Deactivated 130 °C

SYNCHRONIZATION PIN

Max External Capacitance on SYNC Pin 3pF

Internal Oscillator Frequency 720 800 880 kHz

External Synchronization Frequency 720 880 kHz

External Synchronization Signal High 2.5 2.5 5.0 V

External Synchronization Signal Low 0 0.4 V

TEMPERATURE RANGE

Operating –40 +85 °C

NOTES: (1) During UL approval only. (2) DCR011203, DCR011205 available Q2 2000. (3) DCR0112403, DCR012405 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.

SPECIFICATIONS (Cont.)

At TA = +25°C, VS = nominal, IO = 10mA, CO = 0.1µF, unless otherwise specified.

DCR01 SERIES

PARAMETER CONDITIONS MIN TYP MAX UNITS

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 degrada-

tion 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.

Input Voltage:

DCR0105 ............................................................................................ 7V

DCR0112 .......................................................................................... 15V

DCR0124 .......................................................................................... 29V

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

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

ABSOLUTE MAXIMUM RATINGS

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)

NOTE: (1) SO version available Q3 2000.

ORDERING INFORMATION

05 05 (P)

DCR01

PIN # PIN NAME DESCRIPTION

SVoltage Input

3 NC No Connection

12 VREC Rectified Output

13 VOUT Output Ground

14 VOVoltage Output

15 DNC Do Not Connect

16 ENABLE Output Voltage Enable

17 ERROR Error Flag Active Low

26 0VIN Input Ground

27 0VIN Input Ground

28 SYNC Synchronization Input

PIN DEFINITION (PDIP)

PIN # PIN NAME DESCRIPTION

SVoltage Input

2 NC No Connection

REC Rectified Output

80V

OUT Output Ground

OVoltage Output

10 DNC Do Not Connect

11 ENABLE Output Voltage Enable

12 ERROR Error Flag Active Low

17 0VIN Input Ground

18 SYNC Synchronization Input

NOTE: (1) SO version available Q3 2000.

Top View PDIP

PIN CONFIGURATIONS

DCR01

REC

OUT

SYNC

ERROR

ENABLE

DNC

PIN DEFINITION (SO)

DCR01U

REC

OUT

SYNC

ERROR

ENABLE

DNC

PACKAGE SPECIFIED

DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER(1) 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

DCR010503U(3) 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

DCR011203U(1, 3) SO-28 217-2 –40°C to +85°C DCR011203U DCR011203U/1K Tape and Reel

DCR011205P(2) PDIP-18 218-1 –40°C to +85°C DCR011205P DCR011205P Rails

DCR011205U(1, 3) SO-28 217-2 –40°C to +85°C DCR011205U DCR011205U/1K Tape and Reel

DCR012403P(3) PDIP-18 218-1 –40°C to +85°C DCR012403P DCR012403P Rails

DCR012403U(1, 3) SO-28 217-2 –40°C to +85°C DCR012403U DCR012403U/1K Tape and Reel

DCR012405P(3) PDIP-18 218-1 –40°C to +85°C DCR012405P DCR012405P Rails

DCR012405U(1, 3) 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.

PACKAGE/ORDERING INFORMATION

DCR01

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VS = 5V, IO = 10mA, CO = 0.1µF, unless otherwise specified.

DCR0105 SERIES INPUT CURRENT

REFLECTED NOISE (100MHz Bandwidth)

500ns/div

40mA/div

DCR0105 SERIES INPUT

CURRENT REFLECTED RIPPLE

500ns/div

20mA/div

DCR0105 OUTPUT VOLTAGE RIPPLE

Load (%)

Ripple Voltage (mVp-p)

020 40 60 80 1000

DCR0105 OUTPUT NOISE (100MHz Bandwidth)

Load (%)

Noise (mVp-p)

020 40 60 80 1000

DCR010503P EFFICIENCY

= 5V)

Load (%)

Efficiency (%)

010001020

85°C

25°C

30 40 50 60 70 80 90

–40°C

DCR010503P V

OUT

vs LOAD

= 5V)

Load (%)

OUT

(V)

3.305

3.3

3.295

3.29

3.285

3.28

3.275

3.27

3.265 1000 102030405060708090

85°C

25°C

–40°C

DCR01

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VS = 5V, IO = 10mA, CO = 0.1µF, unless otherwise specified.

DCR010503P OUTPUT VOLTAGE NOISE

AT 100% LOAD (100MHz Bandwidth)

200ns/div

20mV/div

Load Current

Output Voltage

DCR010503P OUTPUT VOLTAGE RIPPLE

AT 100% LOAD (20MHz Bandwidth)

200ns/div

5mV/div

DCR010503P LOAD TRANSIENT RESPONSE

10µs/div

30mA Changing

to 325mA

200mV/div

Load Current

Output Voltage

DCR010503P LOAD TRANSIENT RESPONSE

10µs/div

150mA Changing

to 300mA

200mV/div

Load Current

Output Voltage

DCR010505P LOAD TRANSIENT RESPONSE

10µs/div

20mA Changing

to 200mA

200mV/div

Load Current

Output Voltage

DCR010505P LOAD TRANSIENT RESPONSE

10µs/div

100mA Changing

to 200mA

200mV/div

Load Current

Output Voltage

DCR01

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)

200ns/div

20mV/div

DCR010505P OUTPUT VOLTAGE RIPPLE

AT 100% LOAD (20MHz Bandwidth)

200ns/div

5mV/div

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-regu-

lated output voltage, throughout the operating range of the

device.

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 re-

turned high, normal operation resumes.

SYNCHRONIZATION

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 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.

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.

ADDITIONAL FUNCTIONS

DISABLE/ENABLE

The DCR01 can be disabled or enabled by driving the SYNC

pin using an open drain CMOS gate. If the SYNC pin is

DCR01

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 Syn-

chronization 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 oscil-

lators frequency can be measured at VREC, as this is the

fundamental frequency of the ripple component.

OUTPUT ENABLE/DISABLE

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.

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 mini-

mized.

The high switching frequency of 400kHz allows relatively

small values of capacitors to be used for filtering the recti-

fied 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.

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 capaci-

tor is chosen for this purpose when a low ESR smaller

capacitance would perform as well.

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 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.

THERMAL MANAGEMENT

Due to the high power density of this device, it is advisable

to provide a ground plane on the output. The output regula-

tor is mounted on a copper leadframe, and a ground plane

will serve as an efficient heatsink.

DCR01

FIGURE 1. DCR01 with a Single Output.

FIGURE 2. Self-Synchronizing DCR01s with a Dual Output.

DCR 01

OUT

REC

IN(1)

OUT

= 0.1µF

FILTER

= 1µF

0 V

OUT

NOTE: (1) 2.2µF capacitor with low ESR for 5V

devices and 0.47µF for 12V and 24V devices.

DCR 01

OUT

REC

0 V

OUT

SYNC

DCR 01

OUT

REC

0 V

OUT

0 V

OUT

0 V

OUT

SYNC

NOTE: (1) 2.2µF capacitor with low ESR for 5V

devices and 0.47µF for 12V and 24V devices.

IN(1)

OUT

= 0.1µF

IN(1)

OUT

= 0.1µF

FILTER

= 1µF

FILTER

= 1µF