UEI-3.3 データシートの表示（PDF） - Murata Power Solutions

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UEI-3.3

50-60W Isolated Wide-Range DC/DC Converters

Murata Power Solutions 

UEI Series

50-60W Isolated Wide-Range DC/DC Converters

OVP circuit may inadvertantly shut down the converter. If the maximum power

is exceeded, the converter may enter current limiting. If the power is exceeded

for an extended period, the converter may overheat and encounter overtem-

perature shut down.

CAUTION: Be careful of external electrical noise. The Trim input is a senstive

input to the converter’s feedback control loop. Excessive electrical noise may

cause instability or oscillation. Keep external connections short to the Trim

input. Use shielding if needed.

2

−INPUT

6

+OUTPUT

5

+SENSE

4 ON/OFF

CONTROL

TRIM

−SENSE

9

R TRIM UP

8

LOAD

1 +INPUT

7

−OUTPUT

Figure 7 – Trim adjustments to increase Output Voltage using a Fixed Resistor

Trim Equations

Trim Up

<Connect trim resistor

between Trim and –Sense>

Trim Down

<Connect trim resistor

between Trim and +Sense>

UEI-3.3/15-Q12, -3.3/18-Q48

12775

RT UP (:) =

– 2050

VO – 3.3

5110 (Vo - 2.5)

RTDOWN (:) =

– 2050

3.3 – VO

UEI-5/10-Q12, -5/12-Q48

RT UP (:) =

12775

– 2050

VO – 5

5110 (Vo - 2.5)

RTDOWN (:) =

– 2050

5 – VO

UEI-12/4.2-Q12, -12/5-Q48

RT UP (:) =

25000

– 5110

VO – 12

10000 (Vo-2.5)

RTDOWN (:) =

–5110

12 – VO

UEI-15/3.3-Q12, -Q48

RT UP (:) =

25000

– 5110

VO – 15

10000 (Vo-2.5)

RTDOWN (:) =

–5110

15 – VO

Positive: Standard models are enabled when the On/Off pin is left open or

is pulled high to +15V with respect to –VIN. An internal bias current causes the

open pin to rise to +15V. Some models will also turn on at lower intermediate

voltages (see Specifications). Positive-polarity devices are disabled when the

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

respect to –VIN.

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

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

respect to –VIN. The device is off (disabled) when the On/Off is left open or is

pulled high to +15VDC Max. with respect to –VIN.

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.

3

ON/OFF

CONTROL

1 -INPUT

+ Vcc

Figure 8 – Driving the On/Off Control Pin (suggested circuit)

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).

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

power voltage. Otherwise the converter may be permanently damaged.

Where Vo = Desired output voltage. Adjustment accuracy is subject to resis-

tor tolerances and factory-adjusted output accuracy. Mount trim resistor close

to converter. Use short leads.

Remote On/Off Control

On the input side, a remote On/Off Control can be ordered with either polarity.

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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000

MDC_UEI Series 50-60W.B24 Page 9 of 12

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