® DCP01B Series DCP 01 DCP 01 For most current data sheet and other product information, visit www.burr-brown.com Miniature, 1W Isolated UNREGULATED DC/DC CONVERTERS FEATURES APPLICATIONS ● UP TO 85% EFFICIENCY ● POINT-OF-USE POWER CONVERSION ● THERMAL PROTECTION ● DEVICE-TO-DEVICE SYNCHRONIZATION ● GROUND LOOP ELIMINATION ● DATA ACQUISITION ● SHORT CIRCUIT PROTECTION ● EN55022 CLASS B EMC PERFORMANCE ● INDUSTRIAL CONTROL AND INSTRUMENTATION ● TEST EQUIPMENT ● UL1950 RECOGNIZED COMPONENT ● 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 switching frequencies. The use of a highly integrated package design results in highly reliable products with a power density of 40W/in3 (2.4W/cm3). This combination of features and small size makes the DCP01B suitable for a wide range of applications. SYNCOUT 800kHz Oscillator SYNCIN ÷2 Reset VOUT Power Stage 0V Watch-dog/ start-up PSU Thermal Shutdown IBIAS VS Power Controller IC 0V 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 ® © 2000 Burr-Brown Corporation PDS-1586B 1 Printed in U.S.A. May, 2000 DCP01B SPECIFICATIONS At TA = +25°C, unless otherwise specified. DCP01B SERIES PARAMETER CONDITIONS OUTPUT Power Ripple Voltage vs Temp MIN 100% Full Load O/P Capacitor = 1µF, 50% Load Room to Cold Room to Hot INPUT Voltage Range on VS TYP MAX 0.97 20 0.046 0.016 W mVp-p %/°C %/°C –10 ISOLATION Voltage 1s Flash Test 60s Test, UL1950(1) 10 1 1 1 Switching Frequency = fOSC /2 %/1% of VS 800 External 3 kHz V µA µs pF TA = +55°C 75 FITS 0 0.4 VSYNC = +2V RELIABILITY Demonstrated 75 2 THERMAL SHUTDOWN IC Temperature at Shutdown Shutdown Current °C mA 150 3 TEMPERATURE RANGE Operating –40 INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) NO LOAD CURRENT (mA) 10% TO 100% LOAD(3) MIN TYP MAX MIN TYP DCP010505B 4.5 5 5.5 4.75 DCP010505DB 4.5 5 5.5 ±4.25 DCP010512B 4.5 5 5.5 11.4 DCP010512DB 4.5 5 5.5 ±11.4 DCP010515B 4.5 5 5.5 14.25 DCP010515DB 4.5 5 5.5 ±14.25 DCP012405B 21.6 24 26.4 4.75 5 °C EFFICIENCY (%) BARRIER CAPACITANCE (pF) 0% LOAD 100% LOAD VISO = 750V RMS IQ 75% LOAD(2) PRODUCT +100 LOAD REGULATION (%) VNOM VS % kVrms kVrms LINE Regulation SWITCHING/SYNCHRONIZATION Oscillator Frequency (fOSC) Sync Input Low Sync Input Current Disable Time Capacitance Loading on SYNCIN Pin UNITS C ISO MAX TYP MAX TYP TYP TYP 5 5.25 19 31 20 80 3.6 ±5 ±5.75 18 32 22 81 3.8 12 12.6 21 38 29 85 5.1 ±12 ±12.6 19 37 40 82 4.0 15 15.75 26 42 34 82 3.8 ±15 ±15.75 19 41 42 85 4.7 5.25 13 23 14 77 3.8 NOTES: (1) During UL1950 recognition tests only. (2) 100% Load Current = 1W/VNOM TYP. (3) Load regulation = (VOUT at 10% Load – VOUT at 100% Load)/VOUT at 75% Load. ABSOLUTE MAXIMUM RATINGS ELECTROSTATIC DISCHARGE SENSITIVITY Input Voltage: 5V Input Models .................................................................................. 7V 24V Input Models .............................................................................. 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 DCP01 05 05 ( D ) ( B ) ( 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. ) 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 ® DCP01B 2 PIN CONFIGURATION (Single-DIP and Gull-Wing) Top View PIN CONFIGURATION (Dual-DIP and Gull-Wing) DIP VS 1 0V 2 Top View 14 SYNCIN DIP VS 1 0V 2 14 SYNCIN DCP01DB DCP01B 0V 5 0V 5 +VOUT 6 +VOUT 6 NC 7 –VOUT 7 8 SYNCOUT PIN DEFINITION (Single-DIP) PIN # 1 2 5 6 7 8 14 PIN NAME VS 0V 0V +VOUT NC SYNCOUT SYNCIN 8 SYNCOUT PIN DEFINITION (Dual-DIP) DESCRIPTION PIN # Voltage Input Input Side Common Output Side Common +Voltage Out Not Connected Unrectified Transformer Output Synchronization Pin 1 2 5 6 7 8 14 PIN NAME VS 0V 0V +VOUT –VOUT SYNC OUT SYNCIN DESCRIPTION Voltage Input Input Side Common Output Side Common +Voltage Out –Voltage Out Unrectified Transformer Output Synchronization Pin PACKAGE/ORDERING INFORMATION PRODUCT Single DCP010505BP DCP010505BP-U DCP010512BP DCP010512BP-U DCP010515BP DCP010515BP-U DCP012405BP DCP012405BP-U Dual DCP010505DBP DCP010505DBP-U DCP010512DBP DCP010512DBP-U DCP010515DBP DCP010515DBP-U PACKAGE PACKAGE DRAWING NUMBER SPECIFIED TEMPERATURE RANGE DIP-14 DIP-14 Gull-Wing DIP-14 DIP-14 Gull-Wing DIP-14 DIP-14 Gull-Wing DIP-14 DIP-14 Gull-Wing 010-1 010-2 010-1 010-2 010-1 010-2 010-1 010-2 –40°C –40°C –40°C –40°C –40°C –40°C –40°C –40°C to to to to to to to to DIP-14 DIP-14 Gull-Wing DIP-14 DIP-14 Gull-Wing DIP-14 DIP-14 Gull-Wing 010-1 010-2 010-1 010-2 010-1 010-2 –40°C –40°C –40°C –40°C –40°C –40°C to to to to to to PACKAGE MARKING ORDERING NUMBER(1) TRANSPORT MEDIA +100°C +100°C +100°C +100°C +100°C +100°C +100°C +100°C DCP010505BP DCP010505BP-U DCP010512BP DCP010512BP-U DCP010515BP DCP010515BP-U DCP012405BP DCP012405BP-U DCP010505BP DCP010505BP-U/700 DCP010512BP DCP010512BP-U/700 DCP010515BP DCP010515BP-U/700 DCP012405BP DCP012405BP-U/700 Rails Tape and Reel Rails Tape and Reel Rails Tape and Reel Rails Tape and Reel +100°C +100°C +100°C +100°C +100°C +100°C DCP010505DBP DCP010505DBP-U DCP010512DBP DCP010512DBP-U DCP010515DBP DCP010515DBP-U DCP010505DBP DCP010505DBP-U/700 DCP010512DBP DCP010512DBP-U/700 DCP010515DBP DCP010515DBP-U/700 Rails Tape and Reel Rails Tape and Reel Rails 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 devices per reel). Ordering 700 pieces of “DCP010505BP-U/700” will get a single 700-piece Tape and Reel. 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 DCP01B TYPICAL PERFORMANCE CURVES At TA = +25°C, unless otherwise noted. DCP010505B OUTPUT RIPPLE vs LOAD (20MHz BW) DCP010505B VOUT vs VS 5.5 50 1µF Ceramic 4.7µF Ceramic 10µF Ceramic 45 5.4 5.3 5.2 35 5.1 30 VOUT (V) Ripple (mVp-p) 40 25 20 5.0 4.9 4.8 15 4.7 10 4.6 5 4.5 4.4 0 10 20 30 40 50 60 70 80 90 4.5 100 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 90 100 90 100 VS (V) Load (%) DCP010505B VOUT vs LOAD DCP010505B EFFICIENCY vs LOAD 5.8 85 5.7 80 5.6 Efficiency (%) 5.5 VOUT (V) 5.4 5.3 5.2 5.1 75 70 65 5.0 4.9 60 4.8 4.7 55 10 20 30 40 50 60 70 80 90 10 100 20 30 40 Load (%) 50 60 70 80 Load (%) DCP010505DB VOUT vs LOAD DCP010505DB EFFICIENCY vs LOAD 5.8 85 5.7 +VOUT 5.6 –VOUT 80 Efficiency (%) 5.5 VOUT (V) 5.4 5.3 5.2 5.1 75 70 65 5.0 4.9 60 4.8 4.7 55 10 20 30 40 50 60 70 80 90 10 100 Load (%) 30 40 50 60 Load (%) ® DCP01B 20 4 70 80 TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, unless otherwise noted. DCP010512B EFFICIENCY vs LOAD DCP010512B VOUT vs LOAD 14.5 90 14 85 80 Efficiency (%) VOUT (V) 13.5 13 12.5 12 75 70 65 60 11.5 55 50 11 10 20 30 40 50 60 70 80 90 10 100 20 30 40 50 60 70 80 90 100 80 90 100 80 90 100 Load (%) Load (%) DCP010512DB VOUT vs LOAD DCP010512DB EFFICIENCY vs LOAD 14.5 85 14.0 80 13.5 75 Efficiency (%) 12.5 12.0 11.5 70 65 60 11.0 +VOUT –VOUT 10.5 55 10.00 50 10 20 30 40 50 60 70 80 90 100 10 20 30 40 Load (%) 50 60 70 Load (%) DCP010515B VOUT vs LOAD DCP010515B EFFICIENCY vs LOAD 85 18 80 17.5 17 VOUT (V) 75 Efficiency (%) VOUT (V) 13.0 70 65 60 16.5 16 15.5 15 55 14.5 14 50 10 20 30 40 50 60 70 80 90 10 100 20 30 40 50 60 70 Load (%) Load (%) ® 5 DCP01B TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, unless otherwise noted. DCP010515DB EFFICIENCY vs LOAD DCP010515DB VOUT vs LOAD 90 18 85 80 Efficiency (%) VOUT (V) 17 16 75 70 65 60 15 +VOUT –VOUT 55 50 14 10 20 30 40 50 60 70 80 90 10 100 20 30 40 50 90 5.50 80 80 90 100 90 100 70 Efficiency (%) 5.40 VOUT (V) 70 DCP012405B EFFICIENCY vs LOAD DCP012405B VOUT vs LOAD 5.60 5.30 5.20 5.10 60 50 40 30 5.00 20 4.90 10 0 4.80 10 20 30 40 50 60 70 80 10 100 30 40 50 60 70 80 Load (%) DCP010505B CONDUCTED EMISSIONS (125% Load) DCP010505B CONDUCTED EMISSIONS (8% Load) 60 60 50 50 40 30 20 10 0 –10 –20 0.15 20 Load (%) Emission Level, Peak (dBµA) Emission Level, Peak (dBµA) 60 Load (%) Load (%) 1 10 30 20 10 0 –10 –20 0.15 30 Frequency (MHz) 1 Frequency (MHz) ® DCP01B 40 6 10 30 If synchronized devices are used, it should be noted that, at start up, all devices will draw maximum current simultaneously. 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 2.2µF capacitor should be connected close to the input pins. If more than eight devices are to be synchronized, it is recommended that the SYNCIN pins are driven by an external device. Details are contained in a separate applications bulletin (AB-153). 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 process. POWER STAGE This uses a push-pull, center-tapped topology switching at 400kHz (divide by 2 from 800kHz oscillator). CONSTRUCTION The DCP01B’s 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. 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 2µs. ADDITIONAL FUNCTIONS DISABLE/ENABLE The DCP01B can be disabled or enabled by driving the SYNC pin using an open drain CMOS gate. If the SYNCIN pin is pulled low, the DCP01B 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 cause the DCP01B to be enabled. Capacitive loading on the SYNCIN pin should be minimized in order to prevent a reduction in the oscillator frequency. 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 SYNCIN pins together, taking 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. VSUPPLY DECOUPLING Ripple Reduction The high switching frequency of 400kHz allows simple filtering. To reduce ripple, it is recommended that at least a 1µF capacitor is used on VOUT. Dual outputs should both be decoupled to pin 5. A 2.2µF low ESR capacitor on the input of the 5V in versions, and a 0.47µF low ESR cap on the 24V DCP01B in versions is recommended. VOUT 1 VS SYNCIN DCP 01B 0V 0V VS VOUT 2 VOUT1 + VOUT 2 SYNCIN DCP 0V 01B 0V COM FIGURE 1. Connecting the DCP01B in Series. ® 7 DCP01B 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 SYNCIN pin is being used then the tracking between device SYNCIN pins should be short to avoid stray capacitance. If the SYNCIN 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. 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 DCP01B’s galvanic isolation. Connect the positive VOUT from one DCP01B to the negative VOUT (0V) of another (see Figure 1). If the SYNCIN pins are tied together, the self-synchronization feature of the DCP01B will prevent beat frequencies on the voltage rails. The SYNCIN 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 VOUT 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 SYNCIN feature allows easy synchronization to prevent power-rail beat frequencies at no additional filtering cost. THERMAL MANAGEMENT Due to the high power density of this device it is advisable to provide ground planes on the input and output. 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. VSUPPLY VS DCP 01B 0V +VOUT +VOUT –VOUT –VOUT 0V COM FIGURE 2. Connecting Dual Outputs in Series. VSUPPLY VOUT VS SYNCIN DCP 01B 0V 0V VS VOUT 2 x Power Out SYNCIN DCP 01B 0V 0V COM FIGURE 3. Connecting Multiple DCP01Bs in Parallel. ® DCP01B 8