UEI30 Series

30W Isolated Wide-Range DC/DC Converters

www.murata-ps.com

MDC_UEI Series 30W.A01 Page 9 of 11

On/Off is grounded or brought to within a low voltage (see Specifications) with

Negative: Optional negative-polarity devices are on (enabled) when the On/

Off is grounded or brought to within a low voltage (see Specifications) with

Dynamic control of the On/Off function should be able to sink appropriate

signal current when brought low and withstand appropriate voltage when

brought high. Be aware too that there is a finite time in milliseconds (see

Specifications) between the time of On/Off Control activation and stable,

regulated output. This time will vary slightly with output load type and current

and input conditions.

There are two CAUTIONs for the On/Off Control:

CAUTION: While it is possible to control the On/Off with external logic if you

carefully observe the voltage levels, the preferred circuit is either an open

drain/open collector transistor or a relay (which can thereupon be controlled by

logic). The On/Off prefers to be set at approx. +15V (open pin) for the ON state,

assuming positive logic.

CAUTION: Do not apply voltages to the On/Off pin when there is no input

power voltage. Otherwise the converter may be permanently damaged.

Figure 7 – Driving the On/Off Control Pin (suggested circuit)

1

3

ON/OFF

CONTROL

-INPUT

+VCC

Figure 6 – Trim adjustments to increase Output Voltage using a Fixed Resistor

+OUTPUT

TRIM

ON/OFF

CONTROL

+INPUT

LOAD

−OUTPUT

−INPUT