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SHENZHEN SUNYUAN TECHNOLOGY CO., LTD.
DW15~20W SERIES DC-DC CONVERTER
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RATED 15~20W OUTPUT HIGH POWER DENSITY DIP PACKAGE SINGLE&DUAL OUTPUT INDUSTRIAL STANDARD PIN-OUT NO HEAT SINK REQUIRED 1KVDC ISOLATION WIDE INPUT REGULATED OUTPUT PCB MOUNTING OVER CURRENT&SHORT CIRCUIT PROTECTION
ELECTRICAL SPECIFICATIONS
All specifications tested typically @ 25C, humidity<75%, nominal input and rated output unless otherwise noted.
OUTPUT SPECIFICATIONS
Items: Output accuracy: Line regulation: Load regulation: Ripple and noise: Output Threshold Current Output Limiting Protection Output Short Circuit Protection Start-up Time Dynamic Respond Speed 25% Negative LoadFull load Testing condition From 10% to100% load Full load From 0% to full load (20MHz Bandwidth) Min Typ Max Main circuit: 1.0%maxVice-circuit:1.5%max Main output: 0.2%max, Secondary:0.5%max Main output: 0.5%max Secondary: 1.0%max Vo5V, Vp-p max50mV, Vo48V, V p-p max200mV, Other output, V p-p max100mVp-pm 110% Rated Output Current 120%Protection, Automatically recovery Continuous Protection, Automatically recovery 500ms 150us
INPUT SPECIFICATIONS
Items: Input Current Range Input filter Remote Control Testing condition 24VDC 48VDC Pi Switch on: >2.5VDC Min Typ 18-36VDC 36-72VDC Max
Copyright @ Shenzhen Sunyuan Technology Co., Ltd.
Edition-SZSY-07-01
Printed in P.R.C January 2007
Page 1 of 4
SHENZHEN SUNYUAN TECHNOLOGY CO., LTD.
DW15~20W SERIES DC-DC CONVERTER
www..com
COMMON SPECIFICATIONS
Items Operating temperature range Storage temperature range Humidity Cooling Isolation voltage (VDC) Isolation resistance (ohms) Isolation capacitance (pF) Efficiency (%) Case material Potting material Dimension (mm / inch) MTBF (Hrs) See Product List Non-conductive black plastic Epoxy Resin UL94-V0 50.80*40.60*12.70 2*106 (2.00*1.60*0.50) Input to Output Free Air Convection 1500VDC 109 30 Testing condition Min -25C -55C Typ. Max +71C +105C 90%
PRODUCT LIST
Input VoltageVDC Part Number DW20-24S05 DW20-24S12 DW20-24S15 DW20-24D05 DW20-24D12 DW20-24D15 DW20-48S05 DW20-48S12 DW20-48S15 DW20-48D05 DW20-48D12 DW20-48D15
Nominal Range Current (A)
Output
Voltage (VDC)
Efficiency (%, Typ.) 81 83 83 81 82 82 82 83 83 81 83 83
Package DIP DIP DIP DIP DIP DIP DIP DIP DIP DIP DIP DIP
24 24 24 24 24 24 48 48 48 48 48 48
18~36 18~36 18~36 18~36 18~36 18~36 36~72 36~72 36~72 36~72 36~72 36~72
4.00 1.67 1.34 2.0 0.83 0.67 4.0 1.67 1.34 2.0 0.83 0.67
5.0 12.0 15.0 5.0 12.0 15.0 5.0 12.0 15.0 5.0 12.0 15.0
Note: Our company can also offer other types' DC-DC Converter according to customer's requirement.
Note:(1) A minimum 10% load is required on the output to meet the published specifications. Even though working at no load condition will not damage the device, it is not adoptable. (2) If the output power needed is smaller than rated, please connect a proper value resistor at output end in parallel to increase the load or contact us for a lower power product. (3) For lower noise and ripple, please connect a "LC" filter at the output. The capacitance must be at proper value in case of start-up problems.
Copyright @ Shenzhen Sunyuan Technology Co., Ltd.
Edition-SZSY-07-01
Printed in P.R.C January 2007
Page 2 of 4
SHENZHEN SUNYUAN TECHNOLOGY CO., LTD.
DW15~20W SERIES DC-DC CONVERTER CONNECTING DC-DC CONVERTERS IN SERIES
Galvanic isolation of the output allows multiple converters to be connected in series simply by connecting the positive output of one converter to the negative of another (see figure 1). In this way, non-standard voltage rails can be generated, however, the current output of the highest output voltage converter should not be exceeded. When converters are connected in series, additional filtering is strongly recommended as the converters switching circuits are not synchronized. As well as a summation of the ripple voltages, the output could also produce relatively large beat frequencies. A capacitor across the output will help, as will a series inductor.
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CONNECTING DC-DC CONVERTERS IN PARALLEL
If the available power output from a single converter is inadequate for the application, then multiple converters can be paralleled to produce a higher output power. However, it is not recommended to parallel converters to generate a higher power output, please select our higher power output modules or contact us for a customized solution. It should be noted that it is always preferable to parallel multiple converters of the same type. For instance, if a 2.5W converter is required, then either 2pcs AxxxxS-2W should be used or 3 AxxxxS-1W, not an AxxxxS-2W and an AxxxxS-1W. The reason for this is that the output voltages are not sufficiently well matched to guarantee that an AxxxxS-2W would supply twice as much as an AxxxxS-1W and the situation would occur where there was only 1W being drawn from the AxxxxS-2W and 1.5W from AxxxxS-1W. Even with paralleled converters of the same type, loading will be uneven, however, there is only likely to be around a 10% difference in output load when the output voltages are well matched. When connecting converter outputs, it should be remembered that the switching will not be synchronous, hence some form of coupling should be employed. One possible solution is to use a diode feed, this is suitable mainly for 12V and 15V output types only where the diode voltage drop (typically 0.6V) will not significantly affect the circuit functionality (see figure 2). With 5V and 9V supplies the diode drop is generally too large to consider as a suitable means of connecting paralleled converters. This method also has a beat frequency that will superimpose itself over the ripple of the two converters, this can be reduced by using an external capacitor at the paralleled output. The preferred method of connecting converters in parallel is via series inductors on the output (see figure 3). This configuration not only has a lower loss of voltage than the diode method, but by suitable choice of inductor and an additional external capacitor, the beat frequency can be significantly reduced, as will the ripple from each converter. Suitable values are given in the table below (see table 1), these typically reduce the beat and ripple frequencies by a factor of 10.
ISOLATION
One of the main features of the majority of Sunyuan components DC-DC converters is the high galvanic isolation capability. This allows several variations on circuit topography by using a single DC-DC converter. The basic input to output isolation can be used to provide either a simple isolated output power source, or to generate different voltage rails and /or dual polarity rails. These configurations are most often found in data processing, instrumentation and other noise sensitive circuits where it is necessary to isolate the load and noise presented to the local power supply rails from that of an entire system. Usually local supply noise appears as common mode noise at the converter and does not pollute the main system power supply rails. The isolated positive output can be connected to the input ground rail to generate a negative supply rail if required. Since the output is isolated from the input the choice of reference for the output side can be relatively arbitrary, for example an additional single rail can be generated above the main supply rail or offset by some other DC value. Regulated converters need more consideration than the unregulated type for mixing the reference level. Essentially the single supply rail has a regulator in its positive output rail only, hence referring the isolated ground will only work if all the current return is through the DC-DC and not via other external components, such as diode bias, resistor feed. Have an alternative return path can upset the regulation and the performance of the system may not equal that of the converter. In one word, the isolation features are to generate two completely independent power supply but also united perfectly through the modern technology. This has been widely used in the application of mixed circuits, A/D, D/A and other circuits that are sensitive to noise.
FILTERING
All Sunyuan isolated DC-DC Converters have a fixed characteristic frequency at which the device operates. This fixed frequency allows filtering that is relatively simple compared to pulse-skipping types. In a pulse-skipping converter a large range of frequencies are encountered as the device adjusts the pulse interval for loading conditions.
Copyright @ Shenzhen Sunyuan Technology Co., Ltd.
Edition-SZSY-07-01
Printed in P.R.C January 2007
Page 3 of 4
SHENZHEN SUNYUAN TECHNOLOGY CO., LTD.
DW15~20W SERIES DC-DC CONVERTER
www..com NOMENCLATURE
TEMPERATURE DERATING GRAPH
120
Output Power%
100 80 60 40 20 0 -40 0 40 71 85 120
Safe Operating Area
Operating Temp (Celsius)
TYPICAL CONNECTION
+Vin Cin DC-DC
CONVERTER
+Vin Cin DC-DC
CONVERTER
+Vo
+Vo
0V Cout2 -Vo
GND
GND
0V
Dual Output OUTLINE DIMENSION
Single Output PINS DESCRIPTION
Pin Definition PIN 1 2 3 4 5 6 7 Single +Vin GND REM NC +Vo 0V TRIM Dual +Vin GND REM +Vo 0V -Vo TRIM
Left View
Bottom View
SHENZHEN SUNYUAN TECHNOLOGY CO., LTD. 3F, 3Bldg, Duoli Industrial Zone, Meihua Rd. Futian District, Shenzhen 518049, China Tel: +86-755-83100080 Fax: +86-755-83116652 Email: info@szsunyuan.com www.szsunyuan.com
Copyright @ Shenzhen Sunyuan Technology Co., Ltd.
Edition-SZSY-07-01
Printed in P.R.C January 2007
Page 4 of 4

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