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WRB_LT-3WR2

2013.03.12-A/1

Page 6 of 6

DESIGN CONSIDERATIONS

1) Requirement on output load

To ensure this module can operate efficiently and reliably, during operation, the minimum output load could not be less than 5% of the full load,

otherwise ripple maybe increase dramatically. If the actual output power is very small, please connect a resistor with proper resistance at the output end

in parallel to increase the load, suppose to use the resistance of 5% rated power,or use our company

’s products with a lower rated output power.

2) Recommended Circuit

All the WRB_LT-3WR2 series have been tested according to the following recommended test circuit before leaving the factory(See Figure 6).

If you want to further decrease the input/output ripple, you can increase a capacitance-values 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. Provided the safe

and reliable operation is ensured, the greatest capacitance of its filter capacitor must be less than the Max. Capacitive Load.

General:

Cin:

12V

100

μF

24V&48V

10

μF~47μF

Cout: 10

μF/100mA

DC

DC

Vin

GND

+Vo

0V

Cin

Co ut

(Figure 6)

When it is used in unregulated power supply, be sure that the fluctuating range of the power supply and the rippled voltage do not exceed the

module standard. Input current of power supply should afford the flash startup current of this kind of DC/DC module (Figure 7).

General:Vin:12V

Ip =640mA

Vin:24V

Ip =320mA

Vin:48V

Ip =160mA

Input Voltage (V)

Input Voltage

Range

Ip

(Figure 7)

hot-swappable

Note:

1. Min. load shouldn't be less than 5%, otherwise ripple maybe increased dramatically. If the product operates under min. load, it may not be

guaranteed to meet all specifications listed. Operation under minimum load will not damage the converter.

2. Max. Capacitive Load is tested at input voltage range and full load.

3. All specifications measured at Ta=25

°C, humidity<75%, nominal input voltage and rated output load unless otherwise specified.

4. In this datasheet, all test methods are based on our corporate standards.

5. All characteristics are for listed models,and non-standard models may perform differently.Please contact our technical support for more details.

6. Please contact our technical support for any specific requirement.

7. Specifications of this product are subject to changes without prior notice.

MORNSUN Science & Technology Co.,Ltd.

Address: No. 5, Kehui St. 1, Kehui development center, Science Ave., Guangzhou Science City, Luogang district, Guangzhou,P.R.China.

Tel: 86-20-38601850

Fax:86-20-38601272

E-mail: info@mornsun.cn

Http://www.mornsun-power.com