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Burr Brown Products from Texas Instruments
DC
P0
2
DCP02 Series
SBVS011C - MARCH 2000 - REVISED DECEMBER 2005
DC
P0
2
Miniature, 2W, Isolated UNREGULATED DC/DC CONVERTERS
FEATURES
* * * * * * * * * * * * 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
DESCRIPTION
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.
APPLICATIONS
Point-of-Use Power Conversion Ground Loop Elimination Data Acquisition Industrial Control and Instrumentation Test Equipment
800kHz Oscillator
Divide-by-2 Reset
VOUT Power Stage 0V
SYNC/DISABLE
Watchdog/ Startup
PSU Thermal Shutdown VS Power Controller IC
IBIAS
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 (c) 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 Basic Model Number: 2W Product Voltage Input: 5V In Voltage Output: 5V Out Dual Output: Package Code: P = DIP-14 U = SO-28 05 05 (D) ( )
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)
5V input models Input Voltage 12V input models 15V input models 24V input models Storage temperature range (1)
(1)
DCP02 Series 7 15 18 29 -60 to +125
UNIT V V V V 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.
2
DCP02 Series
www.ti.com
SBVS011C - MARCH 2000 - REVISED DECEMBER 2005
ELECTRICAL CHARACTERISTICS
At TA = +25C, unless otherwise noted.
PARAMETER OUTPUT Power Ripple INPUT Voltage range on VS ISOLATION Voltage LINE Regulation SWITCHING/SYNCHRONIZATION Oscillator frequency (fOSC) Sync input low Sync input current Disable time Capacitance loading on SYNC pin RELIABILITY Demonstrated THERMAL SHUTDOWN IC temperature at shutdown Shutdown current TEMPERATURE RANGE Operating -40 +85 C +150 3 C mA TA = +55C 75 FITS External VSYNC = +2V Switching frequency = fOSC/2 0 75 2 10 800 0.4 kHz V A s pF 1 %/1% of VS 1s Flash test 60s test, UL1950 (1) 1 1 kVrms kVrms -10 10 % 100% full load O/P capacitor = 1F, 50% load 2 20 W mVPP TEST CONDITIONS MIN TYP MAX UNIT
(1)
During UL1950 recognition tests only.
ELECTRICAL CHARACTERISTICS PER DEVICE
At TA = +25C, unless otherwise noted.
INPUT VOLTAGE (V) VS PRODUCT DCP020503P, U DCP020505P, U DCP020507P, U DCP020509P, U DCP020515DP, U DCP021205P, U DCP021212P, U DCP021212DP, U DCP021215DP, U DCP021515P, U DCP022405P DCP022405U DCP022405DP, U DCP022412DP, U DCP022415DP, U DCP022418DP, U MIN 4.5 4.5 4.5 4.5 4.5 10.8 10.8 10.8 10.8 13.5 21.6 21.6 21.6 21.6 21.6 21.6 TYP 5 5 5 5 5 12 12 12 12 15 24 24 24 24 24 24 MAX 5.5 5.5 5.5 5.5 5.5 13.2 13.2 13.2 13.2 16.5 26.4 26.4 26.4 26.4 26.4 26.4 MIN 3.13 4.75 6.65 8.55 14.25 4.75 11.4 11.4 14.25 14.25 4.85 4.75 4.75 11.4 14.25 17.1 OUTPUT VOLTAGE (V) VNOM 75% LOAD (1) TYP 3.3 5 7 9 15 5 12 12 15 15 5 5 5 12 15 18 MAX 3.46 5.25 7.35 9.45 15.75 5.25 12.6 12.6 15.75 15.75 5.35 5.25 +5.25 12.6 15.75 18.9 10% TO 100% LOAD TYP 19 14 14 12 11 7 7 6 6 6 6 10 6 4 6 9 MAX 30 20 25 20 20 15 20 20 20 20 10 15 15 16 25 25 LOAD REGULATION (%) NO LOAD CURRENT (mA) IQ 0% LOAD TYP 18 18 20 23 27 14 15 16 21 15 13 13 12 19 16 20 100% LOAD TYP 74 80 81 82 85 83 87 88 87 88 81 81 80 83 79 84 EFFICIENCY (%) BARRIER CAPACITANCE (pF) CISO VISO = 750Vrms TYP 26 22 30 31 24 33 47 35 33 42 33 33 22 29 44 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 0V 1 2 14 SYNC
NVA PACKAGE DIP-14 (Dual-DIP) (Top View)
VS 0V 1 2 14 SYNC
DCP02 0V +VOUT NC 5 6 7 8 NC -VOUT 0V +VOUT 5 6 7
DCP02
8
NC
Table 1. Pin Description (Single-DIP)
TERMINAL NAME VS 0V 0V +VOUT NC SYNC NO. 1 2 5 6 7, 8 14 DESCRIPTION Voltage input Input side common Output side common +Voltage out Not connected Synchronization pin
Table 3. TERMINAL FUNCTIONS (Dual-DIP)
TERMINAL NAME VS 0V 0V +VOUT -VOUT NC SYNC NO. 1 2 5 6 7 8 14 DESCRIPTION Voltage input Input side common Output side common +Voltage out -Voltage out Not connected Synchronization pin
DVB PACKAGE SO-28 (Single-SO) (Top View)
VS 0V 0V 1 2 3 DCP02 28 SYNC 27 NC 26 NC
DVB PACKAGE SO-28 (Dual-SO) (Top View)
VS 0V 0V 1 2 3 DCP02 28 SYNC 27 NC 26 NC
0V 12 +VOUT 13 NC 14
17 NC 16 NC 15 NC 0V 12 +VOUT -VOUT 13 14 17 NC 16 NC 15 NC
Table 2. TERMINAL FUNCTIONS (Single-SO)
TERMINAL NAME VS 0V 0V 0V +VOUT NC SYNC NO. 1 2 3 12 13 14, 15, 16, 17, 26, 27 28 DESCRIPTION Voltage input Input side common Input side common Output side common +Voltage out Not connected Synchronization pin NAME VS 0V 0V 0V +VOUT -VOUT NC SYNC
Table 4. TERMINAL FUNCTIONS (Dual-SO)
TERMINAL NO. 1 2 3 12 13 14 15, 16, 17, 26, 27 28 DESCRIPTION Voltage input Input side common Input side common Output side common +Voltage out -Voltage out Not connected Synchronization pin
4
DCP02 Series
www.ti.com
SBVS011C - MARCH 2000 - REVISED DECEMBER 2005
TYPICAL CHARACTERISTICS
At TA = +25C, unless otherwise noted.
DCP020505P CONDUCTED EMISSIONS (500mA Load)
60 5.04 5.02 5.00
DCP020505P VOUT vs TEMPERATURE (75% Load)
Emission Level, Peak (dBmA)
50 40
VOUT (V)
30 20 10 0 -10 -20 0.15
4.98 4.96 4.94 4.92 4.90
1 Frequency (MHz)
10
30
-40
-20
0
20
40
60
80
100
Temperature (C)
Figure 1. DCP021205P VOUT vs LOAD
5.4 2.5
Figure 2. DCP021205P POWER OUT vs TEMPERATURE (400mA Load)
5.3
2.0
5.1
POUT (W)
0 20 40 Load (%) 60 80 100
VOUT (V)
5.2
1.5
1.0
5.0
0.5
4.9
0 -50 -25 0 25 50 Temperature (C) 75 100
Figure 3. DCP0212 EFFICIENCY vs LOAD
100 DCP1212DP 80 DCP1205P 60 450 400 350
Figure 4. DCP020505P OUTPUT AC RIPPLE (20MHz Band)
0.1F
Ripple (mVPP)
Efficiency (%)
300 250 200 150 100 50 1F
40
20
0 0 25 50 Load (%) 75 100
0 0 200 Load Current (mA) 400
Figure 5.
Figure 6.
5
DCP02 Series
www.ti.com
SBVS011C - MARCH 2000 - REVISED DECEMBER 2005
FUNCTIONAL DESCRIPTION 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. This is due to the small variations in switching frequencies between the DC/DC converters. 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. 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 2.2F capacitor should be connected close to the input pins. 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.
POWER STAGE
The DCP02 uses a push-pull, center-tapped topology switching at 400kHz (divide-by-2 from an 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 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 2s.
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 +150C, the device will shut down. Once the temperature falls below +150C, 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 VS SYNC 0V DCP 02 0V VOUT 1 + VOUT 2 VS SYNC 0V DCP 02 0V VOUT 2 VOUT 1
COM
Figure 7. Connecting the DCP02 in Series
6
DCP02 Series
www.ti.com
SBVS011C - MARCH 2000 - REVISED DECEMBER 2005
ADDITIONAL FUNCTIONS DISABLE/ENABLE
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 2s. Removal of the pull down will cause the DCP02 to be enabled. Capacitive loading on the SYNC pin should be minimized in order to prevent a reduction in the oscillator frequency. Connecting the DCP02 in Series 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. 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 0V 02 +VOUT -VOUT 0V +VOUT -VOUT
DECOUPLING
Ripple Reduction The high switching frequency of 400kHz allows simple filtering. To reduce ripple, it is recommended that a 1F capacitor be used on VOUT. Dual outputs should both be decoupled to pin 5. A 2.2F capacitor on the input is recommended.
COM
Figure 8. Connecting Dual Outputs in Series
VSUPPLY
VS SYNC 0V DCP 02
VOUT
0V 2 x Power Out VOUT DCP 02 0V
VS SYNC 0V
COM
Figure 9. Connecting Multiple DCP02s in Parallel
7
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