WRA-YQD-20& WRA-YQD-20&WRB-YQDWRB-YQDWRB-YQD-2 20W Series SINGLE OUTPUT DC-DC CONVERTER 20W, WIDE INPUT, ISOLATED & REGULATED DUAL/ DUAL/SINGLE SELECTION GUIDE FEATURES Wide 2:1 DC input range ◆ In/out capacitance1000pF ◆ Protections : Short circuit / Overload / Over voltage ◆ 1500VDC I/O isolation for D/D ◆ Cooling by free air convection ◆ Built-in remote ON-OFF control ◆ 100% full load burn-in test ◆ Fixed switching frequency at 225KHz ◆ Lost cost ◆ MTBF>1000Khours ◆ High reliability ◆ 3 year warranty ◆ Output voltage (VDC) Output current max.(mA) Efficiency typ.(%) 9~18 ±5 ±2000 78 9~18 ±12 ±833 82 WRA1215YQD-20W 9~18 ±15 ±667 80 WRA1224YQD-20W 9~18 ±24 ±417 83 WRA2405YQD-20W 18~36 ±5 ±2000 79 WRA2412YQD-20W 18~36 ±12 ±833 82 WRA2415YQD-20W 18~36 ±15 ±667 83 WRA2424YQD-20W 18~36 ±24 ±417 78 WRA4805YQD-20W 36~72 ±5 ±2000 80 WRA4812YQD-20W 36~72 ±12 ±833 84 WRA4815YQD-20W 36~72 ±15 ±667 85 WRA4824YQD-20W 36~72 ±24 ±417 78 WRB1205YQD-20W 9~18 5 4000 79 WRB1212YQD-20W 9~18 12 1667 80 WRB1215YQD-20W 9~18 15 1333 80 WRB1224YQD-20W 9~18 24 833 78 WRB2405YQD-20W 18~36 5 4000 82 WRB2412YQD-20W 18~36 12 1667 82 WRB2415YQD-20W 18~36 15 1333 83 WRB2424YQD-20W 18~36 24 833 78 WRB4805YQD-20W 36~72 5 4000 80 WRB4812YQD-20W 36~72 12 1667 84 WRB4815YQD-20W 36~72 15 1333 85 WRB4824YQD-20W 36~72 24 833 79 Order code Input voltage range (VDC) WRA1205YQD-20W WRA1212YQD-20W MODEL SELECTION ① ② ③ ④ ⑤ ⑥ WRB 24 12 Y QD -20W 0W((1667 1667)) ①Product Series ②Input Voltage ③Output Voltage ④Wide (2:1) Input Range ⑤2"×2"DIP Package Style ⑥Rated Power(Output current) SPECIFICATION OUTPUT APPLICATIONS (Note.2) 100mVp-p Line Regulation (Note.3) ±0.5% Load Regulation (Note.4) ±0.5% Above 105% rated output power The WRA(B)-YQD-20W Series of DC/DC converters has been designed for a wide range of applications including communications, industrial systems and battery powered mobile equipments. Key features are high power density and 2:1 wide input ranges of 18~36 VDC and 36~72 VDC.(But also can do high power density and 4:1 ultrawide input ranges of 9~36 VDC and 18~72 VDC.) Overload PROTECTION Short Circuit FUNCTION SAFETY&EMC (Note 5) MICRODC RESERVES THE COPYRIGHT Over Voltage Protection type : Over power limiting, recovers automatically after fault condition is removed XX03 :3.8~4.95V XX05 :5.75 ~ 7.5V XX12:13.8 ~ 18V XX15:17.25 ~ 22.5V Protection type : Shut off o/p voltage, clamping by zener diode ENVIRONMENT OTHERS NOTE http://www.microdc.cn Ripple&Noise(max.) Protection type : Constant current limiting, recovers automatically after fault condition is removed ON/OFF Control Logic "1" or open: power on Logic "0" short to Vin-: power off Working Temp. -25~+85℃ (Refer to output load derating curve) Storage Temp.,Humidity -25~+85℃, 0~95% RH Temp. Coefficient ±0.03%/ ℃（0~50℃） Safety Standards Design refer to LVD Isolation Voltage I/P-O/P:1.5KVDC Isolation Resistance I/P-O/P:100M Ohms/500VDC MTBF 322.4K hrs min. Dimension 50.8×50.8×16mm (2"×2"×0.63") (L×W×H) Packing 110g;150pcs/15.8Kg/0.97CUFT MIL-HDBK-217F (25℃) 1. All parameters are specified at normal input, rated load, 2570% RH ambient. 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor. 3.Line regulation is measured from low line to high line at rated load. 4.Load regulation is measured from 10% to 100%rated load 5. Please prevent the converter from operating in overload or short circuit condition for more than 30 seconds. Technical Enquiries-Email:[email protected] Tel:0086-20-86000646 Page 1 of 3 WRA-YQD-20& WRA-YQD-20&WRB-YQDWRB-YQDWRB-YQD-2 20W Series SINGLE OUTPUT(WRB-YQD-20W) Mechanical Specification Pin Assignment Pin Assignment 1 +Vin 6 +Vout 2 -Vin 7 -Vout 3,5 No pin 8 Trim 4 CTRL (ON/OFF) DUAL OUTPUT(WRA-YQD-20W) Unit:mm Pin section tolerances:±0.10mm General tolerances:±0.25mm APPLICATION NOTE Requirement on output load In order to ensure the product operate efficiently and reliably,in addition to a max load(namely full load), a minimum load is specified for this kind of DC/DC converter.Make sure the specified range of input voltage is not exceeded,the minimum output load no less than 10% load.If the actual load is less than the specified minimum load, the output ripple may increase sharply while its efficiency and reliability will reduce greatly.If the actual output power is very small,please add an appropriate resistor as extra loading,or contact our company for other lower output power products. Recommended Circuit All the WR-YQD-20W Series have been tested according to the following recommended testing circuit before leaving factory.This series should be tested under load(see Figure 1). If you want to further decrease the input/output ripple,you can increase capacitance properly or choose capacitors with low ESR.However,the capacitance of the output filter capacitor must be proper.If the capacitance is too big,a startup problem might arise.For every channel of output,provided the safe and reliable operation is ensured,the greatest capacitance of its filter capacitor sees (Table 1).General: Cin: 10μF-47μF Cout: 10μF/100mA CTRL Terminal When open or high impedance,the converter work well; When this pin is ‘high’; the converter shutdown; It should be note that the input current (Ic) should between 5-10mA, exceeding the maximum 20mA will cause permanence damage to the converter. The value of R Can be derived as follows : Input current While using unstable power source,please ensure the output voltage and ripple voltage do not exceed indexes of the converter.The preceding power source must be able to provide for converter sufficient starting current Ip. General:Ip≤1.6*Iin-max No parallel connection or plug and play Pin Assignment Pin Assignment 1 +Vin 5 +Vout 2 -Vin 6 Common 3 No pin 7 -Vout 4 CTRL (ON/OFF) 8 Trim TYPICAL CHARACTERISTICS Temperature Derating Graph AMBIENT TEMPERATURE (℃) External Output Trimming OUTPUTMAYOPTIONALLYBE EXTERNALLYTRIMMED(10%) A FIXED RESISTER ORAN EXTERNALTRIMPOTAS SHOWN ON/OFF Control Pin CONTROL INPUT.....................................PIN4 CONTROL COMMON................................PIN2 LOGIC COMPATIBILITY......CMOS OR OPEN COLLECTOR TTL CONTROL VOLTAGE ON..........................................+5.5VDC min OR OPEN CIRCUIT OFF......................................+2.5VDC max. OR SHORT TO PIN2 http://www.microdc.cn Technical Enquiries-Email:[email protected] Tel:0086-20-86000646 Page 2 of 3 WRA-YQD-20& WRA-YQD-20&WRB-YQDWRB-YQDWRB-YQD-2 20W Series OUTLINE DIMENSIONS ＆ FOOTPRINT DETAILS FOSC:225KHz RECOMMENDED FOOTPRINT TUBE OUTLINE DIMENSIONS Grid:2.54×2.54mm(0.1×0.1inch) Unit :mm[inch] Diameter:1.00mm(0.039inch) General tolerances:±0.50mm[±0.020inch] L=230mm[9.055inch] Tube Quantity: 7pcs 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 E-mail:[email protected] Website:http://www.microdc.cn REACH COMPLIANT INFORMATION This series has proven that this product does not contain harmful chemicals, it also has harmful chemical substances through the registration, inspection and approval. http://www.microdc.cn Technical Enquiries-Email:[email protected] Tel:0086-20-86000646 Page 3 of 3