DCP02 Series DC P0 2 DC P0 2 SBVS011C – MARCH 2000 – REVISED DECEMBER 2005 Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS FEATURES • • • • • • • DESCRIPTION Up To 89% Efficiency Thermal Protection Device-to-Device Synchronization SO-28 Power Density of 106W/in3 (6.5W/cm3 ) EN55022 Class B EMC Performance UL1950 Recognized Component JEDEC 14-Pin and SO-28 Packages APPLICATIONS • • • • • Point-of-Use Power Conversion Ground Loop Elimination Data Acquisition Industrial Control and Instrumentation Test Equipment 800kHz Oscillator SYNC/DISABLE The DCP02 series is a family of 2W, isolated, unregulated DC/DC converters. Requiring a minimum of external components and including on-chip device protection, the DCP02 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 power densities of 79W/in3 (4.8W/cm3) for DIP-14, and 106W/in3 (6.5W/cm3) for SO-28. This combination of features and small size makes the DCP02 suitable for a wide range of applications. Divide-by-2 Reset VOUT Power Stage 0V Watchdog/ Startup PSU Thermal Shutdown IBIAS VS Power Controller IC 0V Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2000–2005, Texas Instruments Incorporated DCP02 Series www.ti.com SBVS011C – MARCH 2000 – REVISED DECEMBER 2005 This integrated circuit can be damaged by ESD. Texas Instruments 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 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. ORDERING INFORMATION For the most current package and ordering information, see the Package Option Addendum at the end of this data sheet, or see the TI website at www.ti.com. Supplemental Ordering Information DCP02 05 05 (D) ( ) Basic Model Number: 2W Product Voltage Input: 5V In Voltage Output: 5V Out Dual Output: Package Code: P = DIP-14 U = SO-28 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) Input Voltage Storage temperature range (1) 2 (1) DCP02 Series UNIT 5V input models 7 V 12V input models 15 V 15V input models 18 V 24V input models 29 V –60 to +125 °C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. DCP02 Series www.ti.com SBVS011C – MARCH 2000 – REVISED DECEMBER 2005 ELECTRICAL CHARACTERISTICS At TA = +25°C, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OUTPUT Power 100% full load Ripple O/P capacitor = 1µF, 50% load 2 W 20 mVPP INPUT Voltage range on VS –10 10 % ISOLATION Voltage 1s Flash test 1 kVrms 60s test, UL1950 (1) 1 kVrms LINE Regulation 1 %/1% of VS SWITCHING/SYNCHRONIZATION Oscillator frequency (fOSC) Switching frequency = fOSC/2 800 Sync input low kHz 0 Sync input current 0.4 VSYNC = +2V Disable time µs 2 Capacitance loading on SYNC pin V µA 75 External 10 pF RELIABILITY Demonstrated TA = +55°C 75 FITS THERMAL SHUTDOWN IC temperature at shutdown Shutdown current +150 °C 3 mA TEMPERATURE RANGE Operating (1) –40 +85 °C During UL1950 recognition tests only. ELECTRICAL CHARACTERISTICS PER DEVICE At TA = +25°C, unless otherwise noted. INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) VS NO LOAD CURRENT (mA) 10% TO 100% LOAD 0% LOAD VNOM EFFICIENCY (%) BARRIER CAPACITANCE (pF) 100% LOAD VISO = 750Vrms IQ 75% LOAD (1) PRODUCT LOAD REGULATION (%) CISO MIN TYP MAX MIN TYP MAX TYP MAX TYP TYP TYP DCP020503P, U 4.5 5 5.5 3.13 3.3 3.46 19 30 18 74 26 DCP020505P, U 4.5 5 5.5 4.75 5 5.25 14 20 18 80 22 DCP020507P, U 4.5 5 5.5 6.65 7 7.35 14 25 20 81 30 DCP020509P, U 4.5 5 5.5 8.55 9 9.45 12 20 23 82 31 DCP020515DP, U 4.5 5 5.5 ±14.25 ±15 ±15.75 11 20 27 85 24 DCP021205P, U 10.8 12 13.2 4.75 5 5.25 7 15 14 83 33 DCP021212P, U 10.8 12 13.2 11.4 12 12.6 7 20 15 87 47 DCP021212DP, U 10.8 12 13.2 ±11.4 ±12 ±12.6 6 20 16 88 35 DCP021215DP, U 10.8 12 13.2 ±14.25 ±15 ±15.75 6 20 21 87 33 DCP021515P, U 13.5 15 16.5 14.25 15 15.75 6 20 15 88 42 DCP022405P 21.6 24 26.4 4.85 5 5.35 6 10 13 81 33 DCP022405U 21.6 24 26.4 4.75 5 5.25 10 15 13 81 33 DCP022405DP, U 21.6 24 26.4 ±4.75 ±5 +5.25 6 15 12 80 22 DCP022412DP, U 21.6 24 26.4 ±11.4 ±12 ±12.6 4 16 19 83 29 DCP022415DP, U 21.6 24 26.4 ±14.25 ±15 ±15.75 6 25 16 79 44 DCP022418DP, U 21.6 24 26.4 ±17.1 ±18 ±18.9 9 25 20 84 32 (1) 100% load current = 2W/VNOM typ. 3 DCP02 Series www.ti.com SBVS011C – MARCH 2000 – REVISED DECEMBER 2005 DEVICE INFORMATION NVA PACKAGE DIP-14 (Single-DIP) (Top View) VS 1 0V 2 NVA PACKAGE DIP-14 (Dual-DIP) (Top View) 14 SYNC VS 1 0V 2 14 SYNC DCP02 DCP02 0V 5 0V 5 +VOUT 6 +VOUT 6 NC 7 -VOUT 7 8 NC Table 1. Pin Description (Single-DIP) NC Table 3. TERMINAL FUNCTIONS (Dual-DIP) TERMINAL NAME 8 TERMINAL NO. DESCRIPTION NAME NO. DESCRIPTION VS 1 Voltage input VS 1 Voltage input 0V 2 Input side common 0V 2 Input side common 0V 5 Output side common 0V 5 Output side common +VOUT 6 +Voltage out +VOUT 6 +Voltage out NC 7, 8 Not connected –VOUT 7 –Voltage out SYNC 14 Synchronization pin NC 8 Not connected SYNC 14 Synchronization pin DVB PACKAGE SO-28 (Single-SO) (Top View) VS 1 28 SYNC 0V 2 27 NC 0V 3 26 NC DVB PACKAGE SO-28 (Dual-SO) (Top View) DCP02 VS 1 28 SYNC 0V 2 27 NC 0V 3 26 NC DCP02 0V 12 17 NC +VOUT 13 16 NC 0V 12 17 NC NC 14 15 NC +VOUT 13 16 NC -VOUT 14 15 NC Table 2. TERMINAL FUNCTIONS (Single-SO) Table 4. TERMINAL FUNCTIONS (Dual-SO) TERMINAL NAME NO. DESCRIPTION TERMINAL VS 1 Voltage input NAME 0V 2 Input side common VS 1 Voltage input 0V 3 Input side common 0V 2 Input side common 0V 12 Output side common 0V 3 Input side common +VOUT 13 +Voltage out 0V 12 Output side common Not connected +VOUT 13 +Voltage out –VOUT 14 –Voltage out NC SYNC 14, 15, 16, 17, 26, 27 28 Synchronization pin NC SYNC 4 NO. 15, 16, 17, 26, 27 28 DESCRIPTION Not connected Synchronization pin DCP02 Series www.ti.com SBVS011C – MARCH 2000 – REVISED DECEMBER 2005 TYPICAL CHARACTERISTICS At TA = +25°C, unless otherwise noted. DCP020505P VOUT vs TEMPERATURE (75% Load) 60 5.04 50 5.02 40 5.00 30 VOUT (V) Emission Level, Peak (dBmA) DCP020505P CONDUCTED EMISSIONS (500mA Load) 20 4.96 10 4.94 0 4.92 -10 4.90 -20 0.15 1 10 30 -40 0 20 40 60 80 100 Temperature (°C) Figure 1. Figure 2. DCP021205P VOUT vs LOAD DCP021205P POWER OUT vs TEMPERATURE (400mA Load) 5.4 2.5 5.3 2.0 5.2 1.5 5.1 5.0 1.0 0.5 4.9 0 0 20 40 60 80 100 -50 Load (%) -25 0 25 50 Temperature (°C) 75 Figure 3. Figure 4. DCP0212 EFFICIENCY vs LOAD DCP020505P OUTPUT AC RIPPLE (20MHz Band) 100 100 450 DCP1212DP 400 80 350 DCP1205P 0.1F Ripple (mVPP) Efficiency (%) -20 Frequency (MHz) POUT (W) VOUT (V) 4.98 60 40 300 250 200 150 100 20 1F 50 0 0 0 25 50 Load (%) Figure 5. 75 100 0 200 400 Load Current (mA) Figure 6. 5 DCP02 Series www.ti.com SBVS011C – MARCH 2000 – REVISED DECEMBER 2005 FUNCTIONAL DESCRIPTION This is due to the small variations in switching frequencies between the DC/DC converters. OVERVIEW The DCP02 offers up to 2W of unregulated output power from a 5V, 12V, 15V, or 24V input source with a typical efficiency of up to 89%. This is achieved through highly integrated packaging technology and the implementation of a custom power stage and control IC. The circuit design uses an advanced BiCMOS/DMOS process. The DCP02 overcomes this by allowing devices to be synchronized to one another. Up to eight devices can be synchronized by connecting the SYNC pins together, taking care to minimize the capacitance of tracking. Stray capacitance (> 10pF) will have the effect of reducing the switching frequency, or even stopping the oscillator circuit. It is also recommended that power and ground lines be star-connected. POWER STAGE It should be noted that if synchronized devices are used at start up, all devices will draw maximum current simultaneously. This can cause the input voltage to dip, and if it dips 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. The DCP02 uses a push-pull, center-tapped topology switching at 400kHz (divide-by-2 from an 800kHz oscillator). OSCILLATOR AND WATCHDOG If more than eight devices are to be synchronized, it is recommended that the SYNC pins be driven by an external device. Details are contained in Application Report SBAA035, External Synchronization of the DCP01/02 Series of DC/DC Converters, available for download from www.ti.com. The onboard 800kHz oscillator generates the switching frequency via a divide-by-2 circuit. The oscillator can be synchronized to other DCP02 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. CONSTRUCTION The basic construction of the DCP02 is the same as standard ICs. There is no substrate within the molded package. The DCP02 is constructed using an IC, rectifier diodes, and a wound magnetic toroid on a leadframe. Since there is no solder within the package, the DCP02 does not require any special printed circuit board (PCB) assembly processing. This results in an isolated DC/DC converter with inherently high reliability. THERMAL SHUTDOWN The DCP02 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. VSUPPLY VOUT 1 VS SYNC DCP 02 0V 0V VS VOUT 2 VOUT 1 + VOUT 2 SYNC 0V DCP 02 0V COM Figure 7. Connecting the DCP02 in Series 6 DCP02 Series www.ti.com SBVS011C – MARCH 2000 – REVISED DECEMBER 2005 ADDITIONAL FUNCTIONS DISABLE/ENABLE Connecting the DCP02 in Series The DCP02 can be disabled or enabled by driving the SYNC pin using an open drain CMOS gate. If the SYNC pin is pulled low, the DCP02 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 DCP02 to be enabled. Multiple DCP02 isolated 2W DC/DC converters can be connected in series to provide nonstandard voltage rails. This is possible by using the floating outputs provided by the galvanic isolation of the DCP02. Capacitive loading on the SYNC 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 a 1µF capacitor be used on VOUT. Dual outputs should both be decoupled to pin 5. A 2.2µF capacitor on the input is recommended. Connect the positive VOUT from one DCP02 to the negative VOUT (0V) of another (see Figure 7). If the SYNC pins are tied together, the self-synchronization feature of the DCP02 will prevent beat frequencies on the voltage rails. The SYNC feature of the DCP02 allows easy series connection without external filtering, thus minimizing cost. The outputs on the dual-output DCP02 versions can also be connected in series to provide two times the magnitude of VOUT, as shown in Figure 8. For example, a dual 15V DCP022415D could be connected to provide a 30V rail. Connecting the DCP02 in Parallel If the output power from one DCP02 is not sufficient, it is possible to parallel the outputs of multiple DCP02s, as shown in Figure 9. Again, the SYNC feature allows easy synchronization to prevent power-rail beat frequencies at no additional filtering cost. VSUPPLY VS DCP 02 0V +VOUT +VOUT -VOUT -VOUT 0V COM Figure 8. Connecting Dual Outputs in Series VSUPPLY VOUT VS SYNC DCP 02 0V 0V VS VOUT 2 x Power Out SYNC 0V DCP 02 0V COM Figure 9. Connecting Multiple DCP02s in Parallel 7 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. 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