WRA-YQD-40&

0W

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SINGLE OUTPUT(WRB-YQD-40W)

Pin

Assignment

Pin

Assignment

1

+Vin

6

2

-Vin

7

3,5

No pin

8

Trim

4

CTRL (ON/OFF)

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-40W 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

Mechanical

Specification

Unit:mm

Pin section tolerances:±0.10mm

General tolerances:±0.25mm

TYPICAL

CHARACTERISTICS

Temperature Derating Graph

AMBIENT TEMPERATURE (℃)

External

Trimming

ON/OFF

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

DUAL OUTPUT(WRA-YQD-40W)

Pin

Assignment

Pin

Assignment

1

+Vin

5

2

-Vin

6

Common

3

No pin

7

4

CTRL (ON/OFF)

8

Trim