1 dcp01b miniature, 1w isolated unregulated dc/dc converters copyright ? 2000, texas instruments, incorporated pds-1586c printed in u.s.a. september, 2000 dcp01b series features l up to 85% efficiency l thermal protection l device-to-device synchronization l short circuit protection l en55022 class b emc performance l ul1950 recognized component l jedec pdip-14 and gull-wing packages description the dcp01b series is a family of 1w, unregulated, isolated dc/dc converters. requiring a minimum of external components and including on-chip device protection, the dcp01b series provides extra features such as output disable and synchronization of switch- ing frequencies. the use of a highly integrated package design results in highly reliable products with a power density of 40w/in 3 (2.4w/cm 3 ). this combination of features and small size makes the dcp01b suitable for a wide range of applications. applications l point-of-use power conversion l ground loop elimination l data acquisition l industrial control and instrumentation l test equipment i bias power stage v out 2 reset 800khz oscillator watch-dog/ start-up psu thermal shutdown sync out sync in v s 0v power controller ic 0v dcp01 dcp01 international airport industrial park ? mailing address: po box 11400, tucson, az 85734 ? street address: 6730 s. tucson bl vd., tucson, az 85706 ? tel: (520) 746-1111 twx: 910-952-1111 ? cable: bbrcorp ? telex: 066-6491 ? fax: (520) 889-1510 ? immediate product info: (800) 548-6132 http://www.burr-brown.com/ http://www.ti.com/
2 dcp01b basic model number: 1w product voltage input: 5v in voltage output: 5v out dual output: model revision: package code: p = pdip-14 p-u = pdip-14 gull-wing 05 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: 5v input models .................................................................................. 7v 24v input models .............................................................................. 18v 15v input models .............................................................................. 29v storage temperature ...................................................... C60 c to +125 c lead temperature (soldering, 10s) ................................................. 270 c absolute maximum ratings ordering information 05 () (d ) input output load no load barrier voltage (v) voltage (v) regulation (%) current (ma) efficiency (%) capacitance (pf) v s v nom i q c iso 75% load (2) 10% to 100% load (3) 0% load 100% load v iso = 750v rms product min typ max min typ max typ max typ typ typ dcp010505b 4.5 5 5.5 4.75 5 5.25 19 31 20 80 3.6 dcp010505db 4.5 5 5.5 4.25 5 5.75 18 32 22 81 3.8 dcp010512b 4.5 5 5.5 11.4 12 12.6 21 38 29 85 5.1 dcp010512db 4.5 5 5.5 11.4 12 12.6 19 37 40 82 4.0 dcp010515b 4.5 5 5.5 14.25 15 15.75 26 42 34 82 3.8 dcp010515db 4.5 5 5.5 14.25 15 15.75 19 41 42 85 4.7 dcp011512db 13.5 15 16.5 11.4 12 12.6 11 39 19 78 2.5 dcp011515db 13.5 15 16.5 14.25 15 15.75 12 39 20 80 2.5 dcp012415db 21.6 24 26.4 14.25 15 15.75 10 35 17 76 3.8 dcp012405b 21.6 24 26.4 4.75 5 5.25 13 23 14 77 2.5 notes: (1) during ul1950 recognition tests only. (2) 100% load current = 1w/v nom typ. (3) load regulation = (v out at 10% load C v out at 100% load)/v out at 75% load. specifications at t a = +25 c, unless otherwise specified. dcp01b series parameter conditions min typ max units output power 100% full load 0.97 w ripple o/p capacitor = 1 m f, 50% load 20 mvp-p voltage vs temp room to cold 0.046 %/ c room to hot 0.016 %/ c input voltage range on v s C10 10 % isolation voltage 1s flash test 1 kvrms 60s test, ul1950 (1) 1kvrms line regulation 1 %/1% of v s switching/synchronization oscillator frequency (f osc ) switching frequency = f osc /2 800 khz sync input low 0 0.4 v sync input current v sync = +2v 75 m a disable time 2 m s capacitance loading on sync in pin external 3 pf reliability demonstrated t a = +55 c 75 fits thermal shutdown ic temperature at shutdown 150 c shutdown current 3ma temperature range operating C40 +100 c dcp01 ( b )
3 dcp01b the information provided herein is believed to be reliable; however, burr-brown assumes no responsibility for inaccuracies or o missions. burr-brown assumes no responsibility for the use of this information, and all use of such information shall be entirely at the users own risk. pr ices 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. package specified drawing temperature package ordering transport product package number range marking number (1) media single dcp010505bp dip-14 010-1 C40 c to +100 c dcp010505bp dcp010505bp rails dcp010505bp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp010505bp-u dcp010505bp-u/700 tape and reel dcp010512bp dip-14 010-1 C40 c to +100 c dcp010512bp dcp010512bp rails dcp010512bp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp010512bp-u dcp010512bp-u/700 tape and reel dcp010515bp dip-14 010-1 C40 c to +100 c dcp010515bp dcp010515bp rails dcp010515bp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp010515bp-u dcp010515bp-u/700 tape and reel dcp012405bp dip-14 010-1 C40 c to +100 c dcp012405bp dcp012405bp rails dcp012405bp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp012405bp-u dcp012405bp-u/700 tape and reel dual dcp010505dbp dip-14 010-1 C40 c to +100 c dcp010505dbp dcp010505dbp rails dcp010505dbp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp010505dbp-u dcp010505dbp-u/700 tape and reel dcp010512dbp dip-14 010-1 C40 c to +100 c dcp010512dbp dcp010512dbp rails dcp010512dbp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp010512dbp-u dcp010512dbp-u/700 tape and reel dcp010515dbp dip-14 010-1 C40 c to +100 c dcp010515dbp dcp010515dbp rails dcp010515dbp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp010515dbp-u dcp010515dbp-u/700 tape and reel dual dcp011512dbp dip-14 010-1 C40 c to +100 c dcp011512dbp dcp011512dbp rails dcp011512dbp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp011512dbp-u dcp011512dbp-u/700 tape and reel dcp011515dbp dip-14 010-1 C40 c to +100 c dcp011515dbp dcp011515dbp rails dcp011515dbp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp011515dbp-u dcp011515dbp-u/700 tape and reel dcp012415dbp dip-14 010-1 C40 c to +100 c dcp012415dbp dcp012415dbp rails dcp012415dbp-u dip-14 gull-wing 010-2 C40 c to +100 c dcp012415dbp-u dcp012415dbp-u/700 tape and reel note: (1) models with a slash (/) are available only in tape and reel in the quantities indicated (e.g., /700 indicates 700 dev ices per reel). ordering 700 pieces of dcp010505bp-u/700 will get a single 700-piece tape and reel. package/ordering information top view dip pin configuration (single-dip and gull-wing) top view dip pin configuration (dual-dip and gull-wing) pin definition (single-dip) pin # pin name description 1v s voltage input 2 0v input side common 5 0v output side common 6+v out +voltage out 7 nc not connected 8 sync out unrectified transformer output 14 sync in synchronization pin pin definition (dual-dip) pin # pin name description 1v s voltage input 2 0v input side common 5 0v output side common 6+v out +voltage out 7Cv out Cvoltage out 8 sync out unrectified transformer output 14 sync in synchronization pin dcp01db 1 2 5 6 7 14 8 v s 0v 0v +v out ? out sync in sync out dcp01b 1 2 5 6 7 14 8 v s 0v 0v +v out nc sync in sync out
4 dcp01b typical performance curves at t a = +25 c, unless otherwise noted. dcp010505b output ripple vs load (20mhz bw) load (%) ripple (mvp-p) 50 45 40 35 30 25 20 15 10 5 0 20 30 50 70 60 80 90 100 40 10 1 f ceramic 4.7 f ceramic 10 f ceramic dcp010505b v out vs v s v s (v) v out (v) 5.5 5.4 5.3 5.2 5.1 5.0 4.9 4.8 4.7 4.6 4.5 4.4 4.6 4.7 4.9 5.1 5.0 5.2 5.4 5.3 5.5 4.8 4.5 dcp010505b v out vs load load (%) v out (v) 5.8 5.7 5.6 5.5 5.4 5.3 5.2 5.1 5.0 4.9 4.8 4.7 100 10 20 30 40 50 60 70 80 90 dcp010505b efficiency vs load load (%) efficiency (%) 85 80 75 70 65 60 55 100 10 20 30 40 50 60 70 80 90 dcp010505db v out vs load load (%) v out (v) 5.8 5.7 5.6 5.5 5.4 5.3 5.2 5.1 5.0 4.9 4.8 4.7 100 10 20 30 40 50 60 70 80 90 +v out ? out dcp010505db efficiency vs load load (%) efficiency (%) 85 80 75 70 65 60 55 100 10 20 30 40 50 60 70 80 90
5 dcp01b typical performance curves (cont.) at t a = +25 c, unless otherwise noted. dcp010512b v out vs load load (%) v out (v) 14.5 14 13.5 13 12.5 12 11.5 11 100 10 20 30 40 50 60 70 80 90 dcp010512b efficiency vs load load (%) efficiency (%) 90 85 80 75 70 65 60 55 50 100 10 20 30 40 50 60 70 80 90 dcp010512db v out vs load load (%) v out (v) 14.5 14.0 13.5 13.0 12.5 12.0 11.5 11.0 10.5 10.00 20 30 50 70 60 80 90 100 40 10 +v out ? out dcp010512db efficiency vs load load (%) efficiency (%) 85 80 75 70 65 60 55 50 20 30 50 70 60 80 90 100 40 10 dcp010515b v out vs load load (%) v out (v) 18 17.5 17 16.5 16 15.5 15 14.5 14 100 10 20 30 40 50 60 70 80 90 dcp010515b efficiency vs load load (%) efficiency (%) 85 80 75 70 65 60 55 50 100 10 20 30 40 50 60 70 80 90
6 dcp01b typical performance curves (cont.) at t a = +25 c, unless otherwise noted. dcp010515db v out vs load load (%) v out (v) 18 17 16 15 14 20 30 50 70 60 80 90 100 40 10 +v out ? out dcp010515db efficiency vs load load (%) efficiency (%) 90 85 80 75 70 65 60 55 50 20 30 50 70 60 80 90 100 40 10 dcp012405b v out vs load load (%) v out (v) 5.60 5.50 5.40 5.30 5.20 5.10 5.00 4.90 4.80 20 30 60 50 70 80 100 40 10 dcp012405b efficiency vs load load (%) efficiency (%) 90 80 70 60 50 40 30 20 10 0 20 30 70 60 80 90 100 40 50 10 dcp010505b conducted emissions (125% load) emission level, peak (db a) frequency (mhz) 1 0.15 10 30 60 50 40 30 20 10 0 ?0 ?0 dcp010505b conducted emissions (8% load) emission level, peak (db a) frequency (mhz) 1 0.15 10 30 60 50 40 30 20 10 0 ?0 ?0
7 dcp01b typical performance curves (cont.) at t a = +25 c, unless otherwise noted. dcp011512dbp v out vs load load (%) v out (v) 13.50 13.00 12.50 12.00 11.50 11.00 10.50 100 10 20 30 40 50 60 70 80 90 +v out ? out dcp011512dbp efficiency vs load load (%) efficiency (%) 80 75 70 65 60 55 50 45 40 35 30 20 30 50 70 60 80 90 100 40 10 dcp011515dbp efficiency vs load load (%) efficiency (%) 90 80 70 60 50 40 30 100 10 20 30 40 50 60 70 80 90 dcp011515dbp v out vs load load (%) efficiency (%) 17.00 16.50 16.00 15.50 15.00 14.50 14.00 13.50 13.00 100 10 20 30 40 50 60 70 80 90 +v out ? out dcp012415dbp efficiency vs load load (%) efficiency (%) 90 80 70 60 50 40 30 20 100 10 20 30 40 50 60 70 80 90 dcp012415dbp v out vs load load (%) v out (v) 16.50 16.00 15.50 15.00 14.50 14.00 13.50 100 10 20 30 40 50 60 70 80 90 +v out ? out
8 dcp01b figure 1. connecting the dcp01b in series. functional description overview the dcp01b offers up to 1w of unregulated output power with a typical efficiency of up to 85%. this is achieved through highly integrated packaging technology and the implementation of a custom power stage and control ic. the circuit design utilizes an advanced bicmos/dmos pro- cess. power stage this uses a push-pull, center-tapped topology switching at 400khz (divide by 2 from 800khz oscillator). oscillator and watchdog the onboard 800khz oscillator generates the switching frequency via a divide by 2 circuit. the oscillator can be synchronized to other dcp01b circuits or an external source, and is used to minimize system noise. a watchdog circuit checks the operation of the oscillator circuit. the oscillator can be stopped by pulling the sync pin low. the output pins will be tri-stated. this will occur in 2 m s. thermal shutdown the dcp01b is protected by a thermal shutdown circuit. if the on-chip temperature exceeds 150 c, the device will shut down. once the temperature falls below 150 c, normal operation will resume. synchronization in the event that more than one dc/dc converter is needed onboard, beat frequencies and other electrical interference can be generated. this is due to the small variations in switching frequencies between the dc/dc converters. the dcp01b overcomes this by allowing devices to be synchronized to one another. up to eight devices can be synchronized by connecting the sync in pins together, tak- ing care to minimize the capacitance of tracking. stray capacitance (> 3pf) will have the effect of reducing the switching frequency, or even stopping the oscillator circuit. if synchronized devices are used, it should be noted that, at start up, all devices will draw maximum current simulta- neously. this can cause the input voltage to dip and should it dip below the minimum input voltage (4.5v), the devices may not start up. a 2.2 m f capacitor should be connected close to the input pins. if more than eight devices are to be synchronized, it is recommended that the sync in pins are driven by an exter- nal device. details are contained in a separate applications bulletin (ab-153). construction the dcp01bs basic construction is the same as standard ics. there is no substrate within the molded package. the dcp01b is constructed using an ic, rectifier diodes, and a wound magnetic toroid on a leadframe. as there is no solder within the package, the dcp01b does not require any special pcb assembly processing. this results in an isolated dc/dc converter with inherently high reliability. additional functions disable/enable the dcp01b can be disabled or enabled by driving the sync pin using an open drain cmos gate. if the sync in pin is pulled low, the dcp01b will be disabled. the disable time depends upon the external loading; the internal disable func- tion is implemented in 2 m s. removal of the pull down will cause the dcp01b to be enabled. capacitive loading on the sync in pin should be minimized in order to prevent a reduction in the oscillator frequency. decoupling ripple reduction the high switching frequency of 400khz allows simple filtering. to reduce ripple, it is recommended that at least a 1 m f capacitor is used on v out . dual outputs should both be decoupled to pin 5. a 2.2 m f low esr capacitor on the input of the 5v in versions, and a 0.47 m f low esr cap on the 24v dcp01b in versions is recommended. dcp 01b v out 1 v supply v s 0v dcp 01b v out 2 v out1 + v out 2 sync in sync in v s 0v 0v 0v com
9 dcp01b figure 2. connecting dual outputs in series. connecting the dcp01b in series multiple dcp01b isolated 1w dc/dc converters can be connected in series to provide nonstandard voltage rails. this is possible by utilizing the floating outputs provided by the dcp01bs galvanic isolation. connect the positive v out from one dcp01b to the nega- tive v out (0v) of another (see figure 1). if the sync in pins are tied together, the self-synchronization feature of the dcp01b will prevent beat frequencies on the voltage rails. the sync in feature of the dcp01b allows easy series connection without external filtering, minimizing cost. the outputs on dual output dcp01b versions can also be connected in series to provide two times the magnitude of v out as shown in figure 2. for example, a dual 15v dcp01b could be connected to provide a 30v rail. connecting the dcp01b in parallel if the output power from one dcp01b is not sufficient, it is possible to parallel the outputs of multiple dcp01bs, as shown in figure 3. again, the sync in feature allows easy synchronization to prevent power-rail beat frequencies at no additional filtering cost. pcb layout ripple and noise careful consideration should be given to the layout of the pcb in order that the best results can be obtained. the dcp01b 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 dcp01b. if this is not possible then the supplies must be connected in a star formation with the tracks made as wide as possible. if the sync in pin is being used then the tracking between device sync in pins should be short to avoid stray capaci- tance. if the sync in 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 ground planes on the input and output. figure 3. connecting multiple dcp01bs in parallel. dcp 01b +v out v supply +v out ? out ? out 0v v s 0v com dcp 01b 0v 0v v out v supply v s 0v dcp 01b v out 2 x power out sync in sync in v s 0v com
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