Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833

11/14/2011

603-778-2300 www.wallindustries.com Fax 603-778-9797

Page 6 of 8

MMW Series

Single and Dual Output

4:1 Input Voltage Range

25~30 Watt DC/DC Converter

Rev C

Remote On/Off

Positive logic remote on/off turns the module on during a logic high voltage on the remote on/off pin, and turns the module off

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. The switch can be an open collector or equivalent.

A logic low is -1V to 1.0V.

A logic high is 2.5V to 100V.

The maximum sink current at the on/off terminal (pin 4) during a logic low is -100μA. The maximum allowable leakage

current of the switch at the on/off terminal (pin 4) during a logic high (2.5 to 100V) is 5μA.

Output Voltage Trim

Output voltage trim allows the user to increase or decrease the output voltage set point of a module. The output voltage can

be adjusted by placing an external resistor (R) between the Trim and +Vout or –Vout terminals. By adjusting R, the output

voltage can be changed by ±10% of the nominal output voltage.

+Out

-Out

+Vin

-Vin

Trim Up

Enable

Trim

Trim Down

10K

Trim

Up/Down

A 10K, 1 or 10 turn trimpot is usually specified for continuous trimming. Trim pin may be safely left floating if it is not being

defined in the following equation:

(33 x Vout) - (30 x Vadj)

Vadj - Vout

in the following equation:

(36.667 x Vadj) - (33 x Vout)

Vout - Vadj

Vout:

Nominal Output Voltage

Vadj:

Adjusted Output Voltage

Units

VDC / KΩ

Maximum Capacitive Load

The MMW Series has a 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. For optimum performance we recommend

330μF maximum capacitive load for 12V and 15V outputs and 10,000μF capacitive load for 3.3V and 5V outputs. The

maximum capacitance can be found in the Output Voltage / Current Rating Chart.