WRA-YLS-3W Series WIDE INPUT,ISOLATED & REGULATED Dual Output SIP DC/DC Converter SELECTION GUIDE Input Rated Output Input Effciency Isolation Voltage Voltage Min Load3 Full Load Current2 (MIN.) Capacitance V (NOM.) V mA mA mA % pF WRA2412YLS-3W 24 ±12 ±32 125 157 81 36 FEATURES WRA2415YLS-3W 24 ±15 ±25 100 155 82 36 WRA4812YLS-3W 48 ±12 ±32 125 78 78 40 ◆RoHS compliant WRA4815YLS-3W 48 ±15 ±25 100 78 78 40 order code Output Current ◆Compact SIP form factor ◆2:1 Wide range voltage input INPUT CHARACTERISTICS ◆Continuous short circuit protection with Parameter Conditions Min. Typ. Max. Voltage range All WRA24XX types 18 24 36 All WRA48XX types 36 48 72 All WRA24 types when 10µF at input 200 250 All WRA48 types when 10µF at input 105 150 current foldback Operating temperature range –40 ◆Operating 40°°C to +85 +85°°C Refected ripple current ◆0.5% Load Regulation Shutdown Power ◆ 1kVDC Isolation VIN Nominal 24XX 8 VIN Nominal 48XX 16 Units V mA p-p mW ◆ 24V & 48V nominal input INPUT CHARACTERISTICS ◆ 12V & 15V Output ◆ Power density 1.00W/cm3 ◆ Remote on/off Parameter Conditions Voltage set point accuracy Line regulation With external input/output capacitors Low line to high line with external input/ output capacitors Load regulation Minimum load to rated load with ◆ No electrolytic capacitors ◆ Low noise external input/output capacitors Ripple MODEL SELECTION ① Min. ② ③ ④ ⑤ ⑥ WR WRA A 24 12 Y LS -3W ①Product Series ②Input Voltage ③Output Voltage ④Wide (2:1) Input Range ⑤Lengthened SIP Package Style ⑥ Rated Power PRODUCT OVERVIEW The WRA-YLS-3W series is a range of high performance miniature DC/DC converters having regulated outputs over the wide temperature range of –40°C to +85°C. The input voltage range is 2:1 and the input to output isolation is 1kVDC. Continuous short circuit protection, external control and extremely small SIP packaging provide state of the art functionality. The use of ceramic capacitors and a ceramic substrate, and SMD construction, provide genuine high reliability. Nominal input voltages of 24 and 48V with output voltages of 12 and 15V are available as standard with custom parts on request. The plastic case is rated to UL 94V-0 with encapsulant to UL 94V-1. Ripple & noise BW = 20Hz to 300kHz with external input/ output capacitors BW = DC to 20MHz with external input/ Typ. Max. ±1 ±5 Units % 0.05 0.2 % 0.2 0.5 % 15 30 mV rms 90 150 mV p-p 2.1 5.0 % output capacitors % voltage change on negative output Cross regulation when positive load varies from 12% to 50% with negative load fxed at 50% ABSOLUTE MAXIMUM RATINGS Short-circuit protection Continuous Lead temperature 1.5mm from case for 10 seconds 300°C Minimum output load for specifcation3 25% of rated output Control pin input current 15mA Input voltage 24 types1 40V Input voltage 48 types1 80V Free air space 10mm MIN. around component 1. Absolute maximum value for 30 seconds. Prolonged operation may damage the product. 2. Measured at full load with external input/output capacitors. Refer to application note. 3. A lower load condition can be used but higher levels of output ripple may be experienced, this condition may also cause the output voltage to exceed its specifcation transiently during power down when the input voltage also falls below its rated minimum. All specifcations typical at TA=25°C, Nominal input voltage and rated output current unless otherwise specifed. MICRODC reserves the copyright http://www.microdc.cn Technical Enquiries-Email:[email protected] Tel:0086-20-86000646 Page 1 of 4 WRA-YLS-3W Series TEMPERATURE CHARACTERISTICS Parameter Conditions MIN. TYP. -40 85 Operation -40 100 Storage -50 130 Case temperature rise above ambient Units MAX. Specifcation 12V & 15V output types @ 100% load °C 36 MTTF (MEAN TIME TO FAILURE) Part Number MTTF WRA2412YLS-3W 2077 WRA2415YLS-3W 2080 WRA4812YLS-3W 2090 WRA4815YLS-3W 2045 Conditions Units Calculated using MIL-HDBK 217F with kHrs Nominal input at full voltage (ground benign) at 25°C. GENERAL CHARACTERISTICS Parameter Control pin (CTRL) input current Switching frequency Conditions Please refer to control pin application note MIN. TYP. 6 MAX. Units 15 mA Load causing lowest frequencies, 100% load VIN MIN. 100 125 150 Load causing highest frequencies, 25% load VIN MAX. 300 400 500 MIN. TYP. MAX. kHz ISOLATION CHARACTERISTICS Parameter Conditions Isolation test voltage Flash tested for 1 second Resistance VISO = 1000VDC Units 1000 1 VDC GΩ TECHNICAL NOTES ISOLATION VOLTAGE ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. MICRODC WRA-YLS-3W series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second. A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?” For a part holding no specific agency approvals, such as the WRA-YLS-3W series, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to safety standard requirements. REPEATED HIGH-VOLTAGE ISOLATION TESTING It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. The WRA-YLS-3W series has an EI ferrite core, with no additional insulation between primary and secondary windings of enameled wire. While parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage. This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation system of physical spacing or barriers. http://www.microdc.cn Technical Enquiries-Email:[email protected] Tel:0086-20-86000646 Page 2 of 4 WRA-YLS-3W Series APPLICATION NOTES External capacitance Although these converters will work without external capacitors, they are neces- Value sary in order to guarantee the full parametric performance over the full line and load CIN COUT range. All parts have been tested and characterized using the following values and 10µF, 200V 47µF, 25V test circuit. Value Control Pin The WRA-YLS-3W converters have a shutdown feature which enables the user to put the converter into a low power state. The control pin connects directly to the base of an internal transistor. If the pin is left open (high impedance), the converter will be ON (there is no allowed low state for this pin), but once a control voltage is applied with sufficient drive current, the converter will be switched OFF. A suitable application circuit is shown below. D1 (eg 1N4001) is required to provide high impedence when the signal is low. From the WRA-YLS-3W specifcation, the drive current to operate this function is recommended to be 6mA, and hence the value of R1 can be derived as follows: Cross Regulation Load regulation is at its best when the positive and negative loads are balanced. When the loads are asymmetric, the negative output is not as tightly regulated as the positive output. To meet ripple specifcation a total minimum load of 25% full load is required, however, the WRA-YLS-3W can be used with much lighter loading at the expense of increased ripple. A small load is required on the negative output of 150mW to ensure the maximum negative output voltage is not exceeded. Cross regulation is defined as change in the negative output voltage as a percentage of nominal as the positive output load is changed from 12.5% to 50% with the negative load is fixed at 50% of full load. http://www.microdc.cn Technical Enquiries-Email:[email protected] Tel:0086-20-86000646 Page 3 of 4 WRA-YLS-3W Series PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS PIN CONNECTIONS MECHANICAL DIMENSIONS Pin Function 1 -VIN 2 +VIN 3 CTRL 6 +VOUT 7 0V 8 N/A 9 -VOUT Package weight: 6.5g N/A - Not available for electrical Connection All pins on a 0.1(2.54) pitch and within ± 0.01(0.25) of true position. Unless otherwise stated all dimensions in inches(mm) ±0.01(0.25). RoHS COMPLIANT INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300°C for 10 seconds. The pin termination finish on the SIP package type is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The DIP types are Matte Tin over Nickel Preplate. Both types in this series are backward compatible with Sn/Pb soldering systems. Microdc Professional Power Module,Inc. Tel:0086-20-86000646 REACH COMPLIANT INFORMATION E-mail:[email protected] Website:http://www.microdc.cn http://www.microdc.cn This series has proven that this product does not contain harmful chemicals, it also has harmful chemical substances through the registration, inspection and approval. Technical Enquiries-Email:[email protected] Tel:0086-20-86000646 Page 4 of 4