MSCWI02 SERIES

DC/DC CONVERTER 2W, SMD Package

18, Sin Sin Road, An-Ping Industrial District, Tainan 702, Taiwan

Tel: 886-6-2923150

Fax: 886-6-2923149

E-mail: sales@minmax.com.tw

2016/04/12 P7

Page 5 of 5

Minmax Technology Co., Ltd.

®

Test Setup

Peak-to-Peak Output Noise Measurement Test

Use a Cout 0.47μF ceramic capacitor. Scope measurement should be made by using a BNC socket, measurement bandwidth is 0-20 MHz. Position the load between

50 mm and 75 mm from the DC/DC Converter.

+Out

-Out

+Vin

-Vin

Single Output

DC / DC

Converter

Resistive

Load

Scope

Copper Strip

Cout

Copper Strip

+O u t

-O u t

+V i n

-V i n

D u a l

O u tp u t

D C

/

D C

C o n v e rte r

R e s i s ti v e

Load

Scope

Copper Strip

Cout

Com.

Scope

Cout

Copper Strip

Copper Strip

Technical Notes

Remote On/Off

Negative logic remote on/off turns the module off during a logic high voltage on the remote on/off pin, and on during a logic low. To turn the power module on and off,

the user must supply a switch to control the voltage between the on/off terminal and the -Vin terminal.

A logic high is 2~4mA current applied via 1Kohm resistor. A logic low is open circuit or high impedance.

Maximum Capacitive Load

The MSCWI02 series has limitation of maximum connected capacitance at the output. The power module may be operated in current limiting mode during start-up,

affecting the ramp-up and the startup time. The maximum capacitance can be found in the data sheet.

Overload Protection

To provide protection in a fault (output overload) condition, the unit is equipped with internal current limiting circuitry and can endure current limiting for an unlimited

duration. At the point of current-limit inception, the unit shifts from voltage control to current control. The unit operates normally once the output current is brought back

into its specified range.

Input Source Impedance

The power module should be connected to a low ac-impedance input source. Highly inductive source impedances can affect the stability of the power module. In

applications where power is supplied over long lines and output loading is high, it may be necessary to use a capacitor at the input to ensure startup.

Capacitor mounted close to the power module helps ensure stability of the unit, it is commended to use a good quality low Equivalent Series Resistance (ESR < 1.0Ω

at 100 KHz) capacitor of a 4.7μF for the 5V input devices and a 2.2μF for the 24V and 48V devices.

+

+Out

-Out

+Vin

-Vin

DC / DC

Converter

Load

DC Power

Source

+

-

Cin

Output Ripple Reduction

A good quality low ESR capacitor placed as close as practicable across the load will give the best ripple and noise performance. To reduce output ripple, it is

recommended to use 3.3μF capacitors at the output.

+Out

-Out

+Vin

-Vin

Load

DC Power

Source

+

-

Cout

Single Output

DC / DC

Converter

+Out

-Out

+Vin

-Vin

Load

DC Power

Source

+

-

Cout

Com.

Dual Output

DC / DC

Converter

Load

Cout

Thermal Considerations

Many conditions affect the thermal performance of the power module, such as orientation, airflow over the module and board spacing. To avoid exceeding the

maximum temperature rating of the components inside the power module, the case temperature must be kept below 95℃. The derating curves are determined from

measurements obtained in a test setup.

DUT

Position of air velocity

probe and thermocouple

50mm / 2in

Air Flow

15mm / 0.6in