UEI-3.3/18-Q48PR-C Murata Power Solutions Inc, UEI-3.3/18-Q48PR-C Datasheet - Page 9

• Manufacturer Part Number: UEI-3.3/18-Q48PR-C
• Description: CONVERTER, DC/DC, 3.3V, 18A
• Manufacturer: Murata Power Solutions Inc

Specifications of UEI-3.3/18-Q48PR-C

• No. Of Output Channels: 1
• Input Voltage: 18V To 75V
• Power Rating: 59.4W
• Output Voltage: 3.3V
• Output Current: 18A
• Supply Voltage: 48V
• Dc / Dc Converter Case Style: Through Hole
• Isolation Voltage: 2.25kV
• Product: Isolated
• Output Power: 59 W
• Input Voltage Range: 18 V to 75 V
• Output Voltage (channel 1): 3.3 V
• Output Current (channel 1): 18 A
• No. Of Outputs: 1
• Approval Bodies: CSA / EN / UL
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
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.
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.
Trim Equations
Figure 7 – Trim adjustments to increase Output Voltage using a Fixed Resistor
CAUTION: Be careful of external electrical noise. The Trim input is a senstive
Where Vo = Desired output voltage. Adjustment accuracy is subject to resis-
R
R
R
R
T
T
T
T
UP
UP
UP
UP
between Trim and –Sense>
(:) =
(:) =
(:) =
(:) =
2
4
1
<Connect trim resistor
−
CONTROL
+INPUT
ON/OFF
Trim Up
INPUT
V
V
V
12775
25000
25000
O
12775
V
O
O
– 3.3
O
– 12
– 15
– 5
UEI-15/3.3-Q12, UEI-15/4-Q48
UEI-3.3/15-Q12, -3.3/18-Q48
UEI-12/4.2-Q12, -12/5-Q48
UEI-5/10-Q12, -5/12-Q48
– 2050
– 2050
– 5110
– 5110
+OUTPUT
−
+SENSE
−
OUTPUT
SENSE
TRIM
R
R
R
R
R
T
T
T
T
6
5
9
8
7
DOWN
DOWN
DOWN
DOWN
TRIM UP
between Trim and +Sense>
<Connect trim resistor
(:) =
(:) =
(:) =
(:) =
Trim Down
5110 (Vo - 2.5)
5110 (Vo - 2.5)
10000 (Vo-2.5)
10000 (Vo-2.5)
3.3 – V
12 – V
15 – V
5 – V
O
www.murata-ps.com
O
O
O
LOAD
– 2050
– 2050
–5110
–5110
is pulled high to +15V with respect to –V
open pin to rise to +15V. Some models will also turn on at lower intermediate
voltages (see Specifi cations). Positive-polarity devices are disabled when the
On/Off is grounded or brought to within a low voltage (see Specifi cations) with
respect to –V
Off is grounded or brought to within a low voltage (see Specifi cations) with
respect to –V
pulled high to +15V
signal current when brought low and withstand appropriate voltage when
brought high. Be aware too that there is a fi nite time in milliseconds (see
Specifi cations) 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.
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).
power voltage. Otherwise the converter may be permanently damaged.
Positive: Standard models are enabled when the On/Off pin is left open or
Negative: Optional negative-polarity devices are on (enabled) when the On/
Dynamic control of the On/Off function should be able to sink appropriate
There are two CAUTIONs for the On/Off Control:
CAUTION: While it is possible to control the On/Off with external logic if you
CAUTION: Do not apply voltages to the On/Off pin when there is no input
50-60W Isolated Wide-Range DC/DC Converters
Figure 8 – Driving the On/Off Control Pin (suggested circuit)
IN
IN
.
. The device is off (disabled) when the On/Off is left open or is
DC
Max. with respect to –V
04 Nov 2010
3
1
-INPUT
CONTROL
ON/OFF
MDC_UEI Series 50-60W.B33 Page 9 of 13
IN
. An internal bias current causes the
IN
.
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+ Vcc
UEI Series