® DCP DCP0124 Series 012 4 DCP 012 4 Miniature 24V Input, 1W Isolated UNREGULATED DC/DC CONVERTERS FEATURES DESCRIPTION ● STANDARD JEDEC PLASTIC PACKAGE ● LOW PROFILE: 0.15" (3.8mm) The DCP0124 family is a series of high efficiency, 24V input isolated DC/DC converters. In addition to 1W nominal galvanically isolated output power capability, the range of DC/DCs are also fully synchronizable. The devices feature thermal shutdown, and overload protection is implemented via watchdog circuitry. Advanced power-on reset techniques give superior reset performance and the devices will start into any capacitive load up to full power output. ● SYNCHRONIZABLE ● OUTPUT SHORT CIRCUIT PROTECTION ● THERMAL SHUTDOWN ● STARTS INTO ANY CAPACITIVE LOAD ● EFFICIENCY: 76% (±15V Out) ● 1000Vrms ISOLATION The DCP01 family is implemented in standard-molded IC packaging, giving outlines suitable for high volume assembly. ● 400kHz SWITCHING ● 93 MILLION HOURS MTTF ● AVAILABLE IN TAPE AND REEL APPLICATIONS ● POINT OF USE POWER CONVERSION ● GROUND LOOP ELIMINATION ● DATA ACQUISITION ● INDUSTRIAL CONTROL AND INSTRUMENTATION SYNCOUT ● TEST EQUIPMENT ÷2 Reset 800kHz Oscillator VOUT Power Stage 0V Watch-dog/ start-up SYNCIN 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 © 1997 Burr-Brown Corporation PDS-1383C Printed in U.S.A. February, 1999 SPECIFICATIONS At TA = +25°C, VS = +24V, unless otherwise specified. DCP0124 SERIES PARAMETER CONDITIONS OUTPUT Power MIN VS + 4% 100% Full Load Voltage (VNOM)(1) DCP012405 DCP012415D (+V) DCP012415D (–V) Voltage vs Temperature Short Circuit Duration Ripple INPUT Nominal Voltage (VS) Voltage Range Supply Current Reflected Ripple Current ISOLATION Voltage(2) Continuous Voltage(3) Insulation Resistance Input/Output Capacitance LOAD REGULATION DCP012405 DCP012415D SWITCHING/SYNCHRONIZATION Oscillator Frequency (fOSC) Sync Input Low Sync Input Current Reset Time SYNCOUT Frequency GENERAL No Load Current DCP012405 DCP012415D Efficiency DCP012405 DCP012415D MTTF(3) Weight TYP MAX 1 0.92 75% Full Load 75% Full Load 75% Full Load 4.75 +14.25 –12 VS ± 10% CL = O/P Capacitor = 11µF 100% Full Load Indefinite 5 +15 –15 ±0.08 W W 5.25 +15.75 –15.75 25 1s Flash Test 59 8 V % mA mArms 1 >1 2.5 kVrms kVrms GΩ pF 10 1 10% to 100% Load 10% to 75% Load 75% to 100% Load 10% to 100% Load 10% to 25% Load 25% to 75% Load 75% to 100% Load 17 9 –4 22 11 8 –4 Switching Frequency = fOSC/2 V V V %/°C mVp-p 24 –10 100% Full Load CIN = I/P Capacitor = 1µF 50% Full Load UNITS 23 35 800 % % % % % % % VSYNC = +2V 48 3.8 400 kHz V µA µs kHz 0% Full Load 0% Full Load 14 17 mA mA 100% Full Load 10% Full Load 100% Full Load 10% Full Load TA = +85°C TA = +55°C TA = +25°C 65 34 76 36 % % % % hrs hrs hrs 1.08 g 0 136,000 2,630,000 92,600,000 14-Pin PDIP THERMAL SHUTDOWN Die Temperature Shutdown Current 0.8 115 140 °C mA 100 °C 3 TEMPERATURE RANGE Operating –40 NOTES: (1) 100 % load current = 1W/VNOM typical. (2) Rated working voltage = 130Vrms (IEC950 convention). (3) Life test data. 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. ® DCP0124 2 PIN CONFIGURATION (Single) PIN CONFIGURATION (Dual) Top View DIP VS 1 0V 2 Top View 14 SYNCIN DIP VS 1 0V 2 14 SYNCIN DCP0124 DCP0124 0V 5 0V 5 +VOUT 6 +VOUT 6 NC 7 –VOUT 7 8 SYNCOUT PIN DEFINITION (Single) PIN # 1 2 5 6 7 8 14 PIN NAME VS 0V 0V +VOUT NC SYNCOUT SYNCIN 8 SYNCOUT PIN DEFINITION (Dual) DESCRIPTION PIN # Voltage Input. Input Side Common. Output Side Common. +Voltage Out. No Connection. Unregulated 400kHz Output from Transformer. Synchronization Pin. 1 2 5 6 7 8 14 ABSOLUTE MAXIMUM RATINGS 05 ( D ) ( Voltage Input. Input Side Common. Output Side Common. +Voltage Out. –Voltage Out. Unregulated 400kHz Output from Transformer. Synchronization Pin. 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 24 VS 0V 0V +VOUT –VOUT SYNCOUT SYNCIN DESCRIPTION ELECTROSTATIC DISCHARGE SENSITIVITY Input Voltage ........................................................................................ 29V Storage Temperature ...................................................... –60°C to +150°C Lead Temperature (soldering, 10s) ................................................. 300°C DCP01 PIN NAME ) Basic Model Number: 1W Product Voltage Input: 24V In Voltage Output: 5V Out Dual Output: Package Code: P = 14-Pin Plastic DIP P-U = 14-Pin Plastic Dip Gull Wing 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. PACKAGE/ORDERING INFORMATION PRODUCT Single DCP012405 DCP012405 " Dual DCP012415D DCP012415D " PACKAGE PACKAGE DRAWING NUMBER(1) SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER(2) TRANSPORT MEDIA 14-Pin PDIP 14-Pin PDIP Gull Wing " 010-1 010-2 " –40°C to +100°C –40°C to +100°C " DCP012405P DCP012405P-U " DCP012405P DCP012405P-U DCP012405P-U/700 Rails Rails Tape and Reel 14-Pin PDIP 14-Pin PDIP Gull Wing " 010-1 010-2 " –40°C to +100°C –40°C to +100°C " DCP012415DP DCP012415DP-U " DCP012415DP DCP012415DP-U DCP012415DP-U/700 Rails Rails Tape and Reel NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) 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 DCP012405P-U/700 will get a single 700-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book. ® 3 DCP0124 TYPICAL PERFORMANCE CURVES At TA = +25°C, unless otherwise noted. DCP012405 EFFICIENCY vs LOAD DCP012415D EFFICIENCY vs LOAD 70 80 65 75 70 65 Efficiency (%) Efficiency (%) 60 55 50 45 55 50 45 40 40 35 35 30 30 25 10 50 75 10 100 25 50 Load (%) DCP012405 OUTPUT VOLTAGE vs LOAD DCP012415D OUTPUT VOLTAGE vs LOAD 5.6 18.5 5.5 18.0 5.4 17.5 5.3 5.2 5.1 5.0 100 17.0 16.5 –VOUT 16.0 15.5 4.9 15.0 4.8 14.5 4.7 +VOUT 14.0 0 10 20 30 40 50 60 70 80 90 100 10 25 50 75 100 Load (%) Load (%) REFLECTED rms RIPPLE CURRENT vs LOAD PEAK-TO-PEAK RIPPLE VOLTAGE vs LOAD 140 500 450 120 CL = 100nF 400 rms Ripple Current (mA) Peak-to-Peak Ripple Voltage (mV) 75 Load (%) Output Voltage (V) Output Voltage (V) 60 350 300 250 200 150 CL = 1.1µF 100 CL = 11µF 100 CIN = 100µF 80 60 40 CIN = 1µF 20 50 0 0 0 10 20 30 40 50 60 70 80 90 0 100 ® DCP0124 10 20 30 40 50 Load (%) Load (%) 4 60 70 80 90 100 TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, unless otherwise noted. DCP012415D OUTPUT VOLTAGE vs INPUT VOLTAGE (75% Load) 5.8 17.5 5.6 17.0 5.4 16.5 Output Voltage (V) Output Voltage (V) DCP012405 OUTPUT VOLTAGE vs INPUT VOLTAGE (75% Load) 5.2 5.0 4.8 4.6 16.0 15.5 15.0 14.5 4.4 14.0 4.2 13.5 4.0 21.6 –VOUT +VOUT 13.0 22.8 24.0 25.2 26.4 21 22 23 Input Voltage (V) 101 1.0 100 0.9 99 0.8 Output Power (W) Frequency (%) 25 26 27 OUTPUT POWER vs TEMPERATURE SWITCHING FREQUENCY vs TEMPERATURE 98 97 96 95 0.7 0.6 0.5 0.4 0.3 94 0.2 93 0.1 0 92 –40 –20 0 20 40 60 80 100 –40 120 –20 0 20 40 60 Temperature (°C) Temperature (°C) DCP012415D LOAD BALANCE (+VOUT LOAD = 100%) DCP012415D LOAD BALANCE (+VOUT LOAD = 10%) 20 20 15 15 10 10 +VOUT 5 VOUT (V) VOUT (V) 24 Input Voltage (V) 0 –5 –VOUT 80 100 +VOUT 5 0 –5 –VOUT –10 –10 –15 –15 –20 –20 100 75 50 10 150 –VOUT Load (%) 100 75 50 10 –VOUT Load (%) ® 5 DCP0124 FUNCTIONAL DESCRIPTION THERMAL SHUTDOWN The DCP0124 is also protected by thermal shutdown. If the on-chip temperature reaches a predetermined value, the DC/ DC will shutdown. This effectively gives indefinite short circuit protection for the DC/DC. OVERVIEW The DCP0124 offers up to 1W of unregulated output power from a 24V input source with a typical efficiency of up to 76%. This is achieved through highly integrated packaging technology and the implementation of a custom power stage and control IC. SYNCHRONIZATION Any number of DCP01 family devices can be synchronized by connecting the SYNCIN pins on the devices together (see Figure 1). All the DCP01 devices will then self-synchronize. POWER STAGE This uses a pull-pull, center-tapped topology switching at 400kHz (divide by 2 from 800kHz oscillator). This same synchronization method applies to any VIN version of the DCP01 family, allowing synchronization of various VOUT and VIN DC/DCs. OSCILLATOR AND WATCHDOG The on-board 800kHz oscillator provides the switching frequency via a divide by 2 circuit and allows synchronization via the SYNCIN pins. To synchronize any number of DCP01 family of devices, simply tie the SYNCIN pins together (see the Synchronization section). The watchdog circuitry protects the DC/DC against a stopped oscillator and checks the oscillator frequency which will shut down the output stage if it drops below a certain threshold—i.e., it will be tri-stated after approximately 10µs. +5V The SYNCOUT pin gives an unrectified 400kHz signal from the transformer. This can be used to set the timing of external circuitry on the output side. In noise sensitive applications any pick-up from the SYNCOUT pin can be minimized by putting a guard ring round the pin (see Figure 2). +24V 1 C5 470nF 2 1 per DCP01 VS SYNCIN 14 Bottom View 0V FIGURE 2. SYNCOUT Guard Ring. DCP0124xxx 5 –Out 1 C1 470nF +Out 1 6 DIVIDE BY 2 RESET Isolated DC/DC converter performance normally suffers after power reset. This is because a change in the steady state transformer flux creates an offset after power-up. The DCP01 family does not suffer from this problem. This is achieved through a patented(1) technique employed on the divide by 2 reset circuitry resulting in no change in output phase after power interruption. 0V Out+ 7 8 +5V +24V 1 2 C4 470nF VS SYNCIN 14 0V DCP0105xxx 5 –Out 2 C2 470nF +Out 2 6 CONSTRUCTION 0V 1 2 The DCP0124’s basic construction is the same as standard ICs. There is no substrate within the molded package. The DCP0124 is constructed using an IC, rectifier diodes, and a wound magnetic toroid on a leadframe. As there is no solder within the package, the DCP0124 does not require any special PCB assembly processing. This results in an isolated DC/DC with inherently high reliability. Out+ 7 8 VS SYNCIN 14 0V DCP0105xxx 5 –Out 3 C3 470nF +Out 3 6 7 ADDITIONAL FUNCTIONS 0V Out+ DISABLE/ENABLE The DCP0124 can be disabled or enabled by driving the SYNCIN pin with an open drain CMOS gate. If the SYNCIN pin is pulled low, the DCP0124 will disable. The disable time depends on the output loading but the internal shutdown takes 8 FIGURE 1. Standard Interface. ® DCP0124 6 DECOUPLING up to 10µs. Making the gate open drain will re-enable the DCP0124. However, there is a trade-off in using this function; the DCP0124 quiescent current may increase and the on-chip oscillator may run slower. This degradation in performance is dependent on the external CMOS gate capacitance, therefore the smaller the capacitance, the lower the performance decrease. Driving the SYNCIN pin with a CPU type tri-state output, which has a low output capacitance, offers the lowest reduction in performance. Ripple Reduction The high switching frequency of 400kHz allows simple filtering. To reduce ripple, it is recommended that 0.47µF capacitors are used on VS and VOUT (see Figure 3). Dual outputs should both be decoupled to pin 5. In applications where power is supplied over long lines and output loading is high, or there is significant inductance at the output, it may be necessary to use a 2.2µF capacitor on the input to insure startup. There is no restriction on the size of the output capacitor used to reduce ripple. The DCP0124 will start into any capacitive load. Low ESR capacitors will give the best reduction. +24V 1 C1 0.47µF VS 2 0V EXTERNAL SYNCHRONIZATION DCP012405 5 0V 6 2W The DCP0124 can be synchronized externally if required using a simple external interface. Figure 4 shows a universal interface using a 4066 quad switch. The CTL and SYNCON pins are used to select external synchronization or selfsynchronization. VOut 2W R1 27Ω C2 0.47µF R2 330Ω This interface can also be used to stop (disable) the DCP0124. CTL SYNCON 1 — 0 1 0 1 FIGURE 3. DCP012405 Fully Loaded. FUNCTION External Sync Self-Sync Device Stop +24V 1 2 VCC +Out 1 6 C1 470nF –Out 1 (One Per DC/DC) DCP0124xxx 5 C2 470nF +5V 14 0V 0V 0V SYNC 7 +5V 0V 2 C5 470nF 0V 8 –VOUT VCC C6 470nF R1 33kΩ +VOUT +5V 1 +24V SYNC I/O1A U1 I/O1B CONT CTL 14 0V 0V FREQ IN DCP0115xxx 0V 5 C3 470nF +Out 2 6 0V 2 8 VCC SYNC 14 0V 0V 5 +Out 3 C4 470nF 6 7 I/O1B CONT I/O1A U4 I/O1B CONT I/O1A U5 I/O1B CONT 4066 DCP0115xxx 0V U3 +VOUT 7 1 I/O1A R2 33kΩ SYNC ON 0V R3 33kΩ 0V +VOUT 8 FIGURE 4. Universal Interface. ® 7 DCP0124 Connecting the DCP0124 in Series Multiple DCP01 isolated 1W DC/DC converters can be connected in series to provide non-standard voltage rails. This is possible by utilizing the floating outputs provided by the DCP01’s galvanic isolation. 1. To predict the output voltage at 100% load take the measured or specified voltage at 75% load and multiply by (1 + Load Reg 75% to 100%). For example a DCP012405P typical VOUT at 100% load will be 5V x (1 – 4%) = 4.8V. 2. To predict the output voltage at 10% load take the measured or specified voltage at 75% load and multiply by (1 + Load Reg 10% to 75%). For example a DCP012405P typical VOUT at 10% load will be 5V x (1 + 9%) = 5.4V. Connect the positive VOUT from one DCP01 to the negative VOUT (0V) of another (see Figure 5). If the SYNCIN pins are tied together, the self-synchronization feature of the DCP01 will prevent beat frequencies on the voltage rails. The SYNC feature of the DCP01 allows easy series connection without external filtering which is necessary in competing solutions. 3. To predict the output voltage at 25% load on higher VOUT versions take the measured or specified voltage at 75% load and multiply by (1 + Load Reg 25% to 75%). For example a DCP012415DP typical +VOUT at 25% load will be 12V x (1 + 8%) = 13.0V. To then estimate the voltage at 10% load take the previously calculated +VOUT at 25% load and multiply by (1 + Load Reg 10% to 25%). In this case the typical +VOUT at 10% load will be 13.0V x (1 + 11%) = 14.4V. The outputs on dual output DCP01 versions can also be connected in series to provide 2 times the magnitude of VOUT (see Figure 6). For example, a dual 15V DCP012415D could be connected to provide a 30V rail. Connecting the DCP0124 in Parallel If the output power from one DCP0124 is not sufficient, it is possible to parallel the outputs of multiple DCP01s (see Figure 7). Again, the SYNC feature allows easy synchronization to prevent power-rail beat frequencies at no additional filtering cost. To obtain predictions for loads other than those specified assume the VOUT versus load characteristic is linear between the load points and calculate accordingly. The 10% to 100% load specification guarantees the maximum voltage excursion for any load between 10% to 100% with respect to VOUT at 75% load. PREDICTING OUTPUT VOLTAGE VERSUS LOAD The above does not take into consideration line regulation and assumes a nominal input voltage. The 1:1 line regulation of the DCP01 family means that a percentage change in the input will give a corresponding percentage change in the output. The Load Regulation specifications are calculated as follows: CONDITION CALCULATION 10% to 100% Load 10% to 25% Load 10% to 75% Load 75% to 100% Load (VOUT at 10% load – VOUT at 100% load)/ VOUT at 75% load (VOUT at 10% load – VOUT at 25% load)/ VOUT at 25% load (VOUT at 10% load – VOUT at 75% load)/ VOUT at 75% load (VOUT at 75% load – VOUT at 100% load)/ VOUT at 75% load VSUPPLY VOUT 1 VS SYNCIN DCP 01 0V 0V VOUT1 + VOUT 2 VS SYNCIN VOUT 2 DCP 0V 0V COM FIGURE 5. Connecting the DCP0124 in Series. ® DCP0124 01 8 VSUPPLY VS DCP 01 +VOUT +VOUT –VOUT –VOUT 0V 0V COM FIGURE 6. Connecting Dual Outputs in Series. VSUPPLY VOUT VS SYNCIN DCP 01 0V 0V 2 x Power Out VS SYNCIN VOUT DCP 01 0V 0V COM FIGURE 7. Connecting Multiple DCP0124s in Parallel. 15.24 (0.600) 11.8 (0.464) 1.9 (0.075) 2.54 (0.100) 1.2 (0.047) 14-Pin All Leads on 2.54mm Pitch Dimensions in mm (inches) FIGURE 8. PCB Pad Size and Placement for “U” Package. ® 9 DCP0124