DCR01

DCR01 BURR-BROWN | Alldatasheet

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Miniature, 1W Isolated REGULATED DC/DC CONVERTERS © 2000 Burr-Brown Corporation PDS-1587A Printed in U.S.A. May, 2000 DCR01 Series 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 For most current data sheet and other product information, visit www.burr-brown.com

FEATURES

l PDIP-18, SO-28(1) l 53W/in3 (3.3W/cm3) POWER DENSITY l DEVICE-TO-DEVICE SYNCHRONIZATION l THERMAL PROTECTION l 1000Vrms ISOLATION l 400kHz SWITCHING l 125 FITS AT 55°C l ±10% INPUT RANGE l SHORT-CIRCUIT PROTECTED l 5V, 12V, 24V INPUTS l 3.3V, 5V OUTPUTS l 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

l POINT-OF-USE POWER CONVERSION l DIGITAL INTERFACE POWER l GROUND LOOP ELIMINATION l POWER-SUPPLY NOISE REDUCTION Input Controller LDO Regulator ENABLE VRECSYNC VS ERROR VOUT 0V 0V DCR01 DCR01

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 C IN = 2.2µF, CFILTER = 1µF, COUT = 0.1µF DCR0105 Noise 100MHz Bandwidth, 50% Load 35 mVp-p C IN = 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 I O = 0mA 18 mA IO = 10mA 28 mA IO = 300mA 335 mA DCR010505 I O = 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 C IN = 2.2µF, CFILTER = 1µF

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 V REC V Logic High Input Current 2.0 < V ENABLE < VREC 100 nA Logic Low Input Voltage –0.2 0.5 V Logic Low Input Current 0 < V ENABLE < 0.5 100 nA DCR010503 V DCR010505 V ERROR FLAG Logic High Open Collector Leakage V ERROR = 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 3p F 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: 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)

PIN # PIN NAME DESCRIPTION 1V S Voltage Input 2V S Voltage Input

3 NC No Connection

12 V REC Rectified Output

13 V OUT Output Ground

14 V O Voltage Output

15 DNC Do Not Connect

16 ENABLE Output Voltage Enable

17 ERROR Error Flag Active Low

28 SYNC Synchronization Input

PIN DEFINITION (PDIP) PIN # PIN NAME DESCRIPTION 1V S Voltage Input

2 NC No Connection

80 V OUT Output Ground

10 DNC Do Not Connect

11 ENABLE Output Voltage Enable

12 ERROR Error Flag Active Low

18 SYNC Synchronization Input

NOTE: (1) SO version available Q3 2000. Top View PDIP PIN CONFIGURATIONS DCR01 V S NC VREC 0VOUT VO SYNC 0VIN ERROR ENABLE DNC PIN DEFINITION (SO) DCR01U V S VS NC VREC 0VOUT VO SYNC 0VIN 0VIN 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

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) 20 40 60 80 1000 DCR0105 OUTPUT NOISE (100MHz Bandwidth) Load (%) Noise (mVp-p) 20 40 60 80 1000 DCR010503P EFFICIENCY (VIN = 5V) Load (%) Efficiency (%) 10001 0 2 0 85°C 25°C 30 40 50 60 70 80 90 –40°C DCR010503P V OUT vs LOAD (VIN = 5V) Load (%) VOUT (V) 3.305 3.3 3.295 3.29 3.285 3.28 3.275 3.27 3.265 1000 1 02 03 04 05 06 07 08 09 0 85°C 25°C –40°C

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 325mA200mV/div Load Current Output Voltage DCR010503P LOAD TRANSIENT RESPONSE 10µs/div 150mA Changing to 300mA200mV/div Load Current Output Voltage DCR010505P LOAD TRANSIENT RESPONSE 10µs/div 20mA Changing to 200mA200mV/div Load Current Output Voltage DCR010505P LOAD TRANSIENT RESPONSE 10µs/div 100mA Changing to 200mA200mV/div Load Current Output Voltage

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 V REC . 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

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 V REC , 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 V REC 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.

FIGURE 1. DCR01 with a Single Output. FIGURE 2. Self-Synchronizing DCR01s with a Dual Output.

0 VOUT0V

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

0 VOUT

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