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miniature, 1w isolated regulated dc/dc converters copyright ?2000, texas instruments incorporated sbvs013a printed in u.s.a. december, 2000 dcr01 series features ul1950 recognized pdip-18, so-28 (1) 53w/in 3 (3.3w/cm 3 ) 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 note:(1) so version available q1 2001. 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. applications point-of-use power conversion digital interface power ground loop elimination power-supply noise reduction input controller ldo regulator enable v rec sync v s error v out 0v in 0v out dcr01 dcr01 www.ti.com
dcr01 series 2 sbvs013a specifications at t a = +25 c, v s = nominal, i o = 10ma, c o = 0.1 f, unless otherwise specified. dcr01 series parameter conditions min typ max units output setpoint dcr010503 3.3 v dcr010505 5v dcr011203 3.3 v dcr011205 5v dcr012403 3.3 v dcr012405 5v setpoint accuracy 0.5 2.0 % maximum output current dcr010503p 300 ma dcr010503u (1) 300 ma dcr010505p 200 ma dcr010505u (1) 200 ma dcr011203p 390 ma dcr011203u (1) 300 ma dcr011205p 200 ma dcr011205u (1) 200 ma dcr012403p 390 ma dcr012403u (1) 300 ma dcr012405p 200 ma dcr012405u (1) 390 ma output short-circuit protected duration infinite line regulation dcr010503 1 mv/v dcr010505 1 mv/v dcr011203 1 mv/v dcr011205 1 mv/v dcr012403 1 mv/v dcr012405 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 % dcr011203p 10ma to 390ma load, 10.8v to 13.2v line 1.0 2.5 % dcr011203u (1) 10ma to 300ma 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 % dcr012403p 10ma to 390ma load, 21.6v to 26.4v line 1.0 2.5 % dcr012403u (1) 10ma to 300ma 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 ?0 c to +85 c 1.0 % ripple and noise dcr010503p ripple 20mhz bandwidth, 50% load (2) 5 mvp-p dcr010503p noise 100mhz bandwidth, 50% load (2) 35 mvp-p dcr010503u (1) ripple 20mhz bandwidth, 50% load (2) 8 mvp-p dcr010503u (1) noise 100mhz bandwidth, 50% load (2) 23 mvp-p dcr010505p ripple 20mhz bandwidth, 50% load (2) 6 mvp-p dcr010505p noise 100mhz bandwidth, 50% load (2) 20 mvp-p dcr010505u (1) ripple 20mhz bandwidth, 50% load (2) 9 mvp-p dcr010505u (1) noise 100mhz bandwidth, 50% load (2) 20 mvp-p dcr011203p ripple 20mhz bandwidth, 50% load (2) 10 mvp-p dcr011203p noise 100mhz bandwidth, 50% load (2) 54 mvp-p dcr011203u (1) ripple 20mhz bandwidth, 50% load (2) 8 mvp-p dcr011203u (1) noise 100mhz bandwidth, 50% load (2) 22 mvp-p dcr011205p ripple 20mhz bandwidth, 50% load (2) 6 mvp-p dcr011205p noise 100mhz bandwidth, 50% load (2) 45 mvp-p dcr011205u (1) ripple 20mhz bandwidth, 50% load (2) 6 mvp-p dcr011205u (1) noise 100mhz bandwidth, 50% load (2) 21 mvp-p dcr012403p ripple 20mhz bandwidth, 50% load (2) 10 mvp-p dcr012403p noise 100mhz bandwidth, 50% load (2) 22 mvp-p dcr012403u (1) ripple 20mhz bandwidth, 50% load (2) 8 mvp-p dcr012403u (1) noise 100mhz bandwidth, 50% load (2) 22 mvp-p dcr012405p ripple 20mhz bandwidth, 50% load (2) 10 mvp-p dcr012405p noise 100mhz bandwidth, 50% load (2) 22 mvp-p dcr012405u (1) ripple 20mhz bandwidth, 50% load (2) 13 mvp-p dcr012405u (1) noise 100mhz bandwidth, 50% load (2) 32 mvp-p input nominal voltage (v s ) dcr0105xx 5 v dcr0112xx 12 v dcr0124xx 24 v voltage range ?0 +10 %
dcr01 series 3 sbvs013a supply current dcr010503p i o = 0ma 18 ma i o = 10ma 28 ma i o = 300ma 335 ma dcr010503u (1) i o = 0ma 24 ma i o = 10ma 33 ma i o = 300ma 339 ma dcr010505p i o = 0ma 25 ma i o = 10ma 40 ma i o = 200ma 306 ma dcr010505u (1) i o = 0ma 25 ma i o = 10ma 40 ma i o = 200ma 306 ma dcr011203p i o = 0ma 13 ma i o = 10ma 17 ma i o = 390ma 173 ma dcr011203u (1) i o = 0ma 13 ma i o = 10ma 17 ma i o = 390ma 136 ma dcr011205p i o = 0ma 13 ma i o = 10ma 18 ma i o = 200ma 125 ma dcr011205u (1) i o = 0ma 14 ma i o = 10ma 19 ma i o = 200ma 123 ma dcr012403p i o = 0ma 17 ma i o = 10ma 18 ma i o = 390ma 97 ma dcr012403u (1) i o = 0ma 15 ma i o = 10ma 17 ma i o = 390ma 75 ma dcr012405p i o = 0ma 15 ma i o = 10ma 18 ma i o = 200ma 69 ma dcr012405u (1) i o = 0ma 15 ma i o = 10ma 18 ma i o = 200ma 67 ma reflected ripple current 20mhz bandwidth, 100% load 8 map-p c in = 2.2 f, c filter = 1 f isolation voltage 1s flash test 1 kvrms 60s test, ul1950 (3) 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 < v rec 100 na logic low input voltage ?.2 0.5 v logic low input current 0 < v enable < 0.5 100 na v rec all 3.3v outputs 3.3 v v rec all 5v outputs 5 v error flag logic high open collector leakage v error = 5v 10 a 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 ?0 +85 c notes: (1) so version available q1 2001. (2) c in = 2.2 f, c filter = 1 f, c out = 0.1 f. (3) during ul approval only. specifications (cont.) at t a = +25 c, v s = nominal, i o = 10ma, c o = 0.1 f, unless otherwise specified. dcr01 series parameter conditions min typ max units
dcr01 series 4 sbvs013a package specified drawing temperature package ordering transport product package number range marking number (1) media dcr010503p dip-18 218-1 ?0 c to +85 c dcr010503p dcr010503p rails dcr010503u (2) so-28 217-2 ?0 c to +85 c dcr010503u dcr010503u/1k tape and reel dcr010505p dip-18 218-1 ?0 c to +85 c dcr010505p dcr010505p rails dcr010505u (2) so-28 217-2 ?0 c to +85 c dcr010505u dcr010505u/1k tape and reel dcr011203p dip-18 218-1 ?0 c to +85 c dcr011203p dcr011203p rails dcr011203u (2) so-28 217-2 ?0 c to +85 c dcr011203u dcr011203u/1k tape and reel dcr011205p dip-18 218-1 ?0 c to +85 c dcr011205p dcr011205p rails dcr011205u (2) so-28 217-2 ?0 c to +85 c dcr011205u dcr011205u/1k tape and reel dcr012403p dip-18 218-1 ?0 c to +85 c dcr012403p dcr012403p rails dcr012403u (2) so-28 217-2 ?0 c to +85 c dcr012403u dcr012403u/1k tape and reel dcr012405p dip-18 218-1 ?0 c to +85 c dcr012405p dcr012405p rails dcr012405u (2) so-28 217-2 ?0 c to +85 c dcr012405u dcr012405u/1k tape and reel notes: (1) models with a slash (/) are available only in tape and reel in the quantities indicated (e.g., /1k indicates 1000 de vices per reel). ordering 1000 pieces of ?cr010503u/1k?will get a single 1000-piece tape and reel. (2) so version available q1 2001. package/ordering information 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 ...................................................... ?0 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 q1 2001. ordering information 05 05 (p)
dcr01 series 5 sbvs013a so (1) 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 26 0v in input ground 27 0v in input ground 28 sync synchronization input note: (1) so version available q1 2001. pin definition (dip) pin # pin name description 1v s voltage input 2 nc no connection 7v rec rectified output 80v out output ground 9v o voltage output 10 dnc do not connect 11 enable output voltage enable 12 error error flag active low 17 0v in input ground 18 sync synchronization input top view dip pin configurations dcr01 1 2 7 8 9 18 17 12 11 10 v s nc v rec 0v out v o sync 0v in error enable dnc pin definition (so) (1) dcr01u 1 2 3 12 13 14 28 27 26 17 16 15 v s v s nc v rec 0v out v o sync 0v in 0v in error enable dnc
dcr01 series 6 sbvs013a typical performance curves at t a = +25 c, v s = 5v, i o = 10ma, c o = 0.1 f, unless otherwise specified. dcr0105 output voltage ripple load (%) ripple voltage (mvp-p) 14 12 10 8 6 4 2 0 20 40 60 80 100 0 dcr0105 output noise (100mhz bandwidth) load (%) noise (mvp-p) 80 70 60 50 40 30 20 10 0 20 40 60 80 100 0 3v output efficiency load (%) efficiency (%) 70 60 50 40 30 20 10 0 100 01020 85 c 25 c 30 40 50 60 70 80 90 40 c dcr011203p output voltage ripple load (%) ripple voltage (mvp-p) 30.0 25.0 20.0 15.0 10.0 5.0 0 20 40 60 80 100 0 dcr011205p output voltage ripple 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0 ripple voltage (mvp-p) 0% 20% 40% 60% 80% 100% load% 80 70 60 50 40 30 20 10 0 5v output efficiency effeciency (%) 10 0 2030405060708090100 load (%) +25 c 40 c +85 c
dcr01 series 7 sbvs013a typical performance curves (cont.) at t a = +25 c, v s = 5v, i o = 10ma, c o = 0.1 f, unless otherwise specified. dcr0105 series input current reflected noise (100mhz bandwidth) 500ns/div 40ma/div dcr010503p load transient response 10 s/div 30ma changing to 325ma 200mv/div load current output voltage dcr01 v out vs load load (%) v out (v) 3.305 3.3 3.295 3.29 3.285 3.28 3.275 3.27 3.265 100 0 102030405060708090 85 c 25 c 40 c dcr011203p output noise (100mhz bandwidth) load (%) noise (mvp-p) 120.0 100.0 80.0 60.0 40.0 20.0 0 20 40 60 80 100 0 60.0 50.0 40.0 30.0 20.0 10.0 0 noise (mvp-p) dcr011205p output noise (100mhz bandwidth) 0% 20% 40% 60% 80% 100% load% dcr01 series input current reflected ripple 500ns/div 20ma/div
dcr01 series 8 sbvs013a typical performance curves (cont.) at t a = +25 c, v s = 5v, i o = 10ma, c o = 0.1 f, unless otherwise specified. dcr010503p load transient response 10 s/div 150ma changing to 300ma 200mv/div load current output voltage 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 dcr010505p load transient response 10 s/div 20ma changing to 200ma 200mv/div load current output voltage dcr010505p load transient response 10 s/div 100ma changing to 200ma 200mv/div load current output voltage dcr010505p output voltage noise at 100% load (100mhz bandwidth) 200ns/div 20mv/div
dcr01 series 9 sbvs013a functional description overview the dcr01 series offers isolation from an unregulated power supply operating from a choice of input voltages. the dcr01s 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? 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 onboard oscillator that is used to drive the power switching circuit. the operation of the oscillator is moni- tored 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. dcr010505p output voltage ripple at 100% load (20mhz bandwidth) 200ns/div 5mv/div typical performance curves (cont.) at t a = +25 c, v s = 5v, i o = 10ma, c o = 0.1 f, unless otherwise specified. 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 outside 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 2.2 f capacitor (low esr) should be connected as close to the device input pins as possible for the 5v input devices, and a 0.47 f 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? application bulletin ab-153 (literature number sbaa035) available at www.ti.com. 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.
dcr01 series 10 sbvs013a 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 2 s. 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? frequency. see application bulletin ab-153 ?xternal syn- chronization of the dcp01/02 series of dc/dc convert- ers? this document contains information on how to null the effects of additional capacitance on the sync pin. the oscillator? 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 ?ower 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 2.2 f (minimum) for the 5v input devices and a 0.47 f 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 1 f 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 v rec is full wave rectified and produces a ripple of 800khz. it is recommended that a 0.1 f 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 0.47 f. 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 series 11 sbvs013a figure 1. dcr01 with a single output. figure 2. self-synchronizing dcr01s with a dual output. dcr 01 v out v rec v in c in (1) c out = 0.1 f c filter = 1 f v o1 0 v out 0v v s 0v note: (1) 2.2 f capacitor with low esr for 5v devices and 0.47 f for 12v and 24v devices. dcr 01 v out v rec v in v o1 0 v out 0v v s sync 0v dcr 01 v out v rec v in v o2 0 v out 0 v out 0 v out 0v v s sync 0v note: (1) 2.2 f capacitor with low esr for 5v devices and 0.47 f for 12v and 24v devices. c in (1) c out = 0.1 f c in (1) c out = 0.1 f c filter = 1 f c filter = 1 f
important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. customers are responsible for their applications using ti components. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 2000, texas instruments incorporated

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