ULS Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

www.murata-ps.com

email: sales@murata-ps.com

PART NUMBER STRUCTURE

19 Jul 2010

MDC_ULS Series.B16 Page 2 of 12

Root Model

M

Output

Input

Efficiency

Efficiency

C76

Package

OUT

(V)

OUT

(A, max.)

Power

(W)

R/N (mV pk-pk)

N

Regulation (max.)

(V)

Range

(V)

(mA)

load (A)

Typ.

Max.

Line

Load

Min.

Typ.

Typ.

Case (inches)

ULS-3.3/20-D48N-C

3.3

20

66

70

120

±0.1%

±0.2%

48

36-75

20

1.53

89%

90%

0.9x1.3x0.40

ULS-5/12-D48N-C

5

12

60

50

80

±0.125%

±0.25%

48

36-75

40

1.39

88%

90%

0.9x1.3x0.40

ULS-12/5-D48N-C

12

5

60

80

120

±0.125%

±0.25%

48

36-75

50

1.37

88%

91%

0.9x1.3x0.40

ULS-15/2-D48N-C

15

2

PRELIMINARY – Please contact Murata Power Solutions for further information.

0.9x1.3x0.40

ULS-12/2.5-D48N-C

12

2.5

0.9x1.3x0.40

Maximum Rated Output Current

Current in Amps

Sixteenth Brick Series

Nominal Output Voltage:

ULS

-

/

D48

-

3.3

20

N H

Note:

Some model number combinations

may not be available. Contact Murata

Power Solutions.

Input Voltage Range:

D48

= 36-75 Volts (48V nominal)

On/Off Control Polarity:

N

= Negative, standard

P

= Positive, optional special order

Conformal Coating:

Blank

= No coating, standard

H

= Coating added, optional special order

M Please refer to the Part Number Structure when ordering.

N These specifications are preliminary. Contact Murata Power Solutions for availability.

O All specifications are at nominal line voltage and full load, +25°C unless otherwise noted. See detailed

specifications. Output capacitors are 1 μF ceramic multilayer in parallel with 10 μF electrolytic.

I/O caps are necessary for our test equipment and may not be needed for your application.

➃ Regulation specifications describe output voltage deviations from a nominal/midpoint value to either

extreme (50% load step).

➄ Models ULS-12/2.5-D48N-C and ULS-15/2-D48N-C do not include sense pins.

C

RoHS Hazardous Substance Compliance

(does not claim EU RoHS exemption 7b–lead in solder)

C

= RoHS-6

Y

= RoHS-5

-

Figure 2. On/Off Enable Control Ground Bounce Protection

Preferred location

of On/Off control

adjacent to -Vin

terminal

DC/DC Converter

Install separate

return wire for

On/Off control

with remote

transistor

On/Off

Control

Transistor

Do not connect

control transistor

through remote

power bus

Ground plane or power return bus

+ Vin

On/Off Enable

-Vin return

On/Off Enable Control Ground Bounce Protection

To improve reliability, if you use a small signal transistor or other external

circuit to select the Remote On/Off control, make sure to return the LO side

directly to the –Vin power input on the DC/DC converter. To avoid ground

bounce errors, do not connect the On/Off return to a distant ground plane or

current-carrying bus. If necessary, run a separate small return wire directly to

the –Vin terminal. There is very little current (typically 1-5 mA) on the On/Off

control however, large current changes on a return ground plane or ground

bus can accidentally trigger the converter on or off. If possible, mount the On/

Off transistor or other control circuit adjacent to the converter.

Lx

Pin Length Option (Thru-hole only)

Blank = Standard pin length 0.180˝ (4.6mm)

L1 = 0.110˝ (2.79mm)

L2 = 0.145˝ (3.68mm)