WRA-YQD-20&WRB-YQD-20W
Series
20W, WIDE INPUT, ISOLATED & REGULATED DUAL/SINGLE OUTPUT DC-DC CONVERTER
DUAL/SINGLE
SELECTION GUIDE
Order code
WRA1205YQD-20W
WRA1212YQD-20W
WRA1215YQD-20W
Input voltage range
(VDC)
Output voltage
(VDC)
Output current
max.(mA)
Efficiency typ.(%)
9~18
9~18
9~18
9~18
18~36
18~36
18~36
18~36
36~72
36~72
36~72
36~72
9~18
9~18
9~18
9~18
18~36
18~36
18~36
18~36
36~72
36~72
36~72
36~72
±5
±12
±15
±24
±5
±12
±15
±24
±5
±12
±15
±24
5
12
15
24
5
12
15
24
5
12
15
24
±2000
±833
±667
±417
±2000
±833
±667
±417
±2000
±833
±667
±417
4000
1667
1333
833
4000
1667
1333
833
4000
1667
1333
833
78
82
80
83
79
82
83
78
80
84
85
78
79
80
80
78
82
82
83
78
80
84
85
79
FEATURES
◆
WRA1224YQD-20W
WRA2405YQD-20W
Wide 2:1 DC input range
In/out capacitance1000pF
WRA2412YQD-20W
WRA2415YQD-20W
WRA2424YQD-20W
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
Protections : Short circuit / Overload / Over voltage
1500VDC I/O isolation for D/D
Cooling by free air convection
WRA4805YQD-20W
WRA4812YQD-20W
WRA4815YQD-20W
WRA4824YQD-20W
WRB1205YQD-20W
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
WRB1212YQD-20W
WRB1215YQD-20W
WRB1224YQD-20W
WRB2405YQD-20W
WRB2412YQD-20W
WRB2415YQD-20W
WRB2424YQD-20W
WRB4805YQD-20W
WRB4812YQD-20W
WRB4815YQD-20W
WRB4824YQD-20W
MODEL SELECTION
①
②
③ ④
⑤
⑥
WRB 24 12 Y QD -20W(1667)
①Product
Series
②Input
Voltage
③Output
Voltage
④Wide
(2:1) Input Range
⑤2"×2"DIP
Package Style
⑥Rated
Power(Output current)
SPECIFICATION
Ripple&Noise(max.)
OUTPUT
Line Regulation
Load Regulation
(Note.2)
(Note.3)
(Note.4)
100mVp-p
±0.5%
±0.5%
APPLICATIONS
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.)
PROTECTION
Above 105% rated output power
Overload
Protection type : Over power limiting, recovers automatically after fault
condition is removed
XX03 :3.8~4.95V
Over Voltage
XX12:13.8 ~ 18V
XX05 :5.75 ~ 7.5V
XX15:17.25 ~ 22.5V
Protection type : Shut off o/p voltage, clamping by zener diode
Short Circuit
FUNCTION
ON/OFF Control
Working Temp.
ENVIRONMENT
Storage Temp.,Humidity
Protection type : Constant current limiting, recovers automatically after
fault condition is removed
Logic "1" or open: power on
Logic "0" short to Vin-: power off
-25~+85℃ (Refer to output load derating curve)
-25~+85℃, 0~95% RH
±0.03%/
℃（0~50℃）
Design refer to LVD
I/P-O/P:1.5KVDC
I/P-O/P:100M Ohms/500VDC
322.4K hrs min.
MIL-HDBK-217F (25℃)
Temp. Coefficient
SAFETY&EMC
(Note 5)
Safety Standards
Isolation Voltage
Isolation Resistance
MTBF
MICRODC RESERVES THE COPYRIGHT
OTHERS
Dimension
Packing
50.8×50.8×16mm (2"×2"×0.63") (L×W×H)
110g;150pcs/15.8Kg/0.97CUFT
NOTE
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.
http://www.microdc.cn
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 1 of 3
WRA-YQD-20&WRB-YQD-20W
Series
Mechanical Specification
Pin
1
2
3,5
4
SINGLE OUTPUT(WRB-YQD-20W)
Assignment
+Vin
-Vin
No pin
CTRL (ON/OFF)
Pin
6
7
8
Assignment
+V
out
-V
out
Trim
DUAL OUTPUT(WRA-YQD-20W)
Pin
1
2
3
Unit:mm
Pin section tolerances:±0.10mm
General tolerances:±0.25mm
Assignment
+Vin
-Vin
No pin
CTRL (ON/OFF)
Pin
5
6
7
8
Assignment
+V
out
Common
-V
out
Trim
4
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
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:tech@microdc.cn Tel:0086-20-86000646
Page 2 of 3
WRA-YQD-20&WRB-YQD-20W
Series
OUTLINE DIMENSIONS
＆
FOOTPRINT DETAILS
FOSC:225KHz
RECOMMENDED FOOTPRINT
TUBE OUTLINE DIMENSIONS
Grid:2.54×2.54mm(0.1×0.1inch)
Diameter:1.00mm(0.039inch)
Unit :mm[inch]
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.
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.
Microdc Professional Power Module,Inc.
Tel:0086-20-86000646
E-mail:tech@microdc.cn
Website:http://www.microdc.cn
http://www.microdc.cn
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
Page 3 of 3
京公网安备 11010802033920号
EEWORLD
