WRA-YQD-20&

WRA-YQD-20&

WRA-YQD-20&

WRA-YQD-20&

WRA-YQD-20&

WRA-YQD-20&

WRA-YQD-20&

WRB-YQD-

WRB-YQD-

WRB-YQD-

WRB-YQD-

WRB-YQD-

WRB-YQD-

2

2

2

2

2

2

0W

0W

0W

0W

0W

0W

Series

http://www.microdc.cn

Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646

Page 2 of 3

SINGLE

SINGLE

SINGLE

SINGLE OUTPUT(WRB-YQD-20W)

OUTPUT(WRB-YQD-20W)

OUTPUT(WRB-YQD-20W)

OUTPUT(WRB-YQD-20W)

Pin

Assignment

Pin

Assignment

1

+Vin

6

2

-Vin

7

3,5

No pin

8

Trim

4

CTRL (ON/OFF)

APPLICATION

APPLICATION

APPLICATION

APPLICATION

APPLICATION

APPLICATION

APPLICATION

NOTE

NOTE

NOTE

NOTE

NOTE

NOTE

NOTE

Requirement

Requirement

Requirement

Requirement on

on

on

on output

output

output

output load

load

load

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

Recommended

Recommended

Recommended Circuit

Circuit

Circuit

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

CTRL

CTRL

CTRL Terminal

Terminal

Terminal

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

Input

Input

Input current

current

current

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

No

No

No parallel

parallel

parallel

parallel connection

connection

connection

connection or

or

or

or plug

plug

plug

plug and

and

and

and play

play

play

play

Mechanical

Mechanical

Mechanical

Mechanical

Mechanical

Mechanical

Mechanical

Specification

Specification

Specification

Specification

Specification

Specification

Specification

Unit:mm

Pin section tolerances:±0.10mm

General tolerances:±0.25mm

TYPICAL

TYPICAL

TYPICAL

TYPICAL

TYPICAL

TYPICAL

TYPICAL

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

CHARACTERISTICS

Temperature Derating Graph

AMBIENT TEMPERATURE (℃)

External

External

External

External

External

External

External

Output

Output

Output

Output

Output

Output

Trimming

Trimming

Trimming

Trimming

Trimming

Trimming

Trimming

OUTPUTMAYOPTIONALLYBE EXTERNALLYTRIMMED(10%)

A FIXED RESISTER ORAN EXTERNALTRIMPOTAS SHOWN

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

Control

Control

Control

Control

Control

Control

Pin

Pin

Pin

Pin

Pin

Pin

Pin

CONTROL INPUT.....................................PIN4

CONTROL COMMON................................PIN2

LOGIC COMPATIBILITY......CMOS OR OPEN COLLECTOR TTL

CONTROL

CONTROL

CONTROL

CONTROL VOLTAGE

VOLTAGE

VOLTAGE

VOLTAGE

ON..........................................+5.5VDC min OR OPEN CIRCUIT

OFF......................................+2.5VDC max. OR SHORT TO PIN2

DUAL

DUAL

DUAL

DUAL OUTPUT(WRA-YQD-20W)

OUTPUT(WRA-YQD-20W)

OUTPUT(WRA-YQD-20W)

OUTPUT(WRA-YQD-20W)

Pin

Assignment

Pin

Assignment

1

+Vin

5

2

-Vin

6

Common

3

No pin

7

4

CTRL (ON/OFF)

8

Trim