BEI15 Series
www.murata-ps.com
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
Typical unit
FEATURES
PRODUCT OVERVIEW
Small footprint DC/DC converter, ideal for
high current applications
Featuring a full 15 Watt output in one square
inch of board area, the BEI-15 series isolated DC/
DC converter family offers efficient regulated DC
power for printed circuit board mounting. The
wide range 4:1 inputs on the 0.96" x 1.1" x 0.35"
(24.4 x 27.9 x 8.9 mm) converter are either 9 to 36
Volts DC (Q12 models) or 18 to 75 Volts DC (Q48
models), ideal for battery-powered and telecom
equipment. The industry-standard pinout fits larger
1" x 2" converters. Fixed output voltages of ±5,
±12 or ±15 VDC are regulated to within ±0.25%.
Applications include small instruments, arealimited microcontrollers, data communications
equipment, remote sensor systems, vehicle and
portable electronics.
The BEI-15 series includes full magnetic
and optical isolation with Basic protection up to
Industry standard 0.96" x 1.1" X 0.35"
open frame package and pinout
Wide range input voltages 9-36 and
18-75 Vdc
Bipolar ±5V, ±12V and ±15V outputs
Up to 15 Watts or greater total output
power with overtemperature shutdown
Isolation up to 2250 VDC (basic), Q48 models
High efficiency synchronous rectifier
forward topology
Usable -40 to 85°C temperature range
(with derating)
2250 Volts DC (Q48 models) and 2000 VDC (Q12
models). For powering digital systems, the outputs
offer fast settling to step transients and will accept
higher capacitive loads. Excellent ripple and noise
specifications assure compatibility to noise-susceptible circuits. For systems requiring controlled
startup/shutdown, an external remote On/Off
control may use a switch, transistor or digital logic.
A wealth of self-protection features avoid both
converter and external circuit faults. These include
input undervoltage lockout and overtemperature
shutdown. The outputs current limit using the
“hiccup” autorestart technique and the outputs
are short-circuit protected. Additional features
include output overvoltage and reverse conduction
elimination. The high efficiency offers minimal heat
buildup and “no fan” operation.
Assembly and attachment for RoHS standards
Extensive self-protection shut down
features
Meets UL 60950-1, CAN/CSAC22.2 No. 60950-1, IEC60950-1,
EN60950-1 safety approvals (2nd Edition)
CONNECTION DIAGRAM
*TPMBUJPO
Barrier
+Vin (1)
F1
External
DC
Power
Source
On/Off
Control
(3)
Controller
and
Power
5SBOTGFS
Open = On
$MPTFE0GG
1PTJUJWF
MPHJD
t4XJUDIJOH
t'JMUFST
+Vout (6)
Common (5)
t4XJUDIJOH
t'JMUFST
-Vout (4)
Reference and
Error Amplifier
-Vin (2)
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
Murata Power Solutions recommends a fuse at F1.
REG.-Nr. D806
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MDC_BEI15W.A17 Page 1 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀
Output
Input
R/N (mVp-p)
Regulation (Max.)
IIN =
VIN
no
Nom. Range load
(V)
(V) (mA)
Min.
Root Models ➀
IOUT
Total
VOUT (mA, Power
(V) max.)➁ (W)
Typ.
Max.
BEI15-050-Q12
±5
±1500
15
60
100
±0.25% ±0.25%
24
9-36
90
740
82.8%
84%
BEI15-050-Q48
±5
±1500
15
60
100
±0.25% ±0.25%
48
18-75
50
374
82%
83.5%
BEI15-120-Q12
±12
±625
15
80
120
±0.25% ±0.25%
24
9-36
95
730
82%
86%
BEI15-120-Q48
±12
±625
15
80
120
±0.25% ±0.25%
48
18-75
50
370
84%
85.5%
BEI15-150-Q12
±15
±500
15
100
150
±0.25% ±0.25%
24
9-36
100
740
83%
84%
BEI15-150-Q48
±15
±500
15
100
150
±0.25% ±0.25%
48
18-75
50
360
84.5%
86%
Line
Load➄
➀ Please refer to the part number structure for additional options and complete
ordering part numbers.
➁ The minimum output load for the BEI-15W series is 10% of maximum current to
meet published specifications. The converter will not be damaged by less than
10% load but some specs may degrade slightly.
➂ All specifications are at nominal line voltage and full load, +25 °C. unless otherwise noted. See detailed specifications and notes for full conditions.
Open Frame
Package – C69
Efficiency
IIN =
full
load
(mA)
Typ.
(inches)
(mm)
Case
Pinout
0.96x1.1x0.35
24.4x27.9x8.9
P74
Output capacitors are 1 μF ceramic in parallel with 10 μF electrolytic. The input cap
is 100 μF, low ESR.
I/O caps are necessary for our test equipment and may not be needed for your
application.
➃ RoHS-6 compliance does not claim EU RoHS exemption 7b (lead in solder).
➄ Balanced loads, 10% to 100% loads.
PART NUMBER STRUCTURE
BEI15 - 050 - Q12 P H Lx - C
Bipolar Wide Input
15-Watt Series
Nominal Output Voltage
in Tenths of a Volt
Input Voltage Range
Q12 = 9-36V
Q48 = 18-75V
RoHS-6 Hazardous
Substance Compliance (note 4)
Pin Length Option
Blank = Std. pin length 0.25˝ (6.3mm)
L1 = 0.110˝ (2.79mm)
L2 = 0.145˝ (3.68mm)
*Minimum
*
*
order quantity is required.
Samples available with standard pin
length only.
Conformal Coating Option
Blank = No coating, standard
H = Coating added, optional
(built to order; contact Murata Power Solutions for MOQ and lead times.)
*
On/Off Control Logic
P = Positive
N = Negative
X = Control pin omitted‡
‡Some model number combinations may not
be available. See website or contact your local
Murata sales representative.
Special Customer Configuration Part Number:
BEI15-150-Q48N-C-CIS
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MDC_BEI15W.A17 Page 2 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
FUNCTIONAL SPECIFICATIONS
INPUT CHARACTERISTICS
Input voltage range
Start-up threshold, Volts typ.
Undervoltage shutdown, Volts
Overvoltage shutdown, Volts
Reflected (back) ripple current mA pk-pk
Input current
Full load conditions
Inrush transient, A2sec
Output short circuit, mA
Output at min. load, mA
Low line (Vin=min.), Amps
Standby mode, mA (Off, UV, OT shutdown)
Recommended fuse, Amps
Internal input filter type
Reverse polarity protection
Remote On/Off Control
Positive logic ("P" model suffix)
BEI15-050-Q12
BEI15-050-Q48
9.0
8.5
17.0
16.0
5
30
0.05
50
90
2.03
25
4
0.05
50
50
1.0
1
2
BEI15-120-Q12
BEI15-120-Q48
See ordering guide
9.5
17.0
8.4
16.2
none
30
30
See ordering guide
0.05
0.05
50
50
95
50
2.01
0.97
1
1
4
2
Capacitive
None, install external fuse
BEI15-150-Q48
8.9
8.4
17.0
16.0
5
30
0.05
50
30
1.97
1
4
0.05
50
50
0.96
1
2
OFF=Gnd pin or
-0.7 to +0.8V max.
ON=open pin or
+10 to +15V max.
Negative logic ("N" model suffix)
OFF=open pin or
+10 to +15V max.
ON=Gnd pin or
-0.7 to +0.8V max.
On/Off Current, mA max.
OUTPUT CHARACTERISTICS
Voltage output range
Voltage output accuracy, % of Vnom. (50% load)
Temperature coefficient, % of Vout range/°C
Minimum loading, percent of full power
Ripple/noise (20 MHz bandwidth)
Line/Load regulation
Efficiency
BEI15-150-Q12
1
BEI15-050-Q12
BEI15-050-Q48
BEI15-120-Q12
BEI15-120-Q48
See ordering guide
±1
±0.02
10
BEI15-150-Q12
BEI15-150-Q48
See ordering guide
Capacitive loading, μF max.,
low ESR <0.02Ω max., resistive load
500
500
150
150
100
100
Overvoltage protection, Volts
(hiccup auto restart after fault removal)
6.5
7
15.8
16
18
20
2250
10
700
2000
10
1000
2250
10
1000
1.1
0.9
0.9
OV protection method
Isolation voltage
Input to Output, Volts DC min.
Isolation resistance, MΩ min.
Isolation capacitance, pF
Isolation safety rating
Miscellaneous
Current limit inception, Amps (Vout
actual ≤ 98% of Vnom.) after warmup
Short circuit protection method
Short circuit current, Amps max.
Short circuit duration (output shorted to ground)➀
Magnetic feedback
2000
10
1000
2250
10
1000
2000
10
600
Basic insulation
2.6
2.5
1
Current limiting, hiccup autorestart
0.3
Continuous
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MDC_BEI15W.A17 Page 3 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
DYNAMIC CHARACTERISTICS
Start-up time, mS, max.
BEI15-050-Q12
50
BEI15-050-Q48
50
BEI15-120-Q12
50
BEI15-120-Q48
50
BEI15-150-Q12
50
BEI15-150-Q48
50
50
50
50
60
50
50
250μSec
±100mV
350
250μSec
±100mV
305
250μSec
±150mV
300
250μSec
±150mV
320
250μSec
±200mV
330
250μSec
±200mV
320
0.32 (9.07)
0.32 (9.07)
Vin to Vout regulated, mS, max.
(Remote On/Off to Vout regulated)
Dynamic Load Response (50-75-50% load step)
Settling time
Peak deviation
Switching frequency, KHz
Calculated MTBF, hours
Operating temperature range
>2000000
(Ambient, natural convection, with derating,
vertical mount). See Derating graphs.
-40 to +85°C
No derating
Storage temperature range
-40 to +70°C
-55 to +125°C
Thermal protection/shutdown, °C
(measured at PWM)
130
Relative humidity, non-condensing
PHYSICAL CHARACTERISTICS
Outline dimensions
Pin material
Pin diameter
Pin Finish
Weight, ounces (grams)
To +85°C/85%
0.352 (10)
0.352 (10)
Electromagnetic interference
(requires external filter)
Meets EN55022 and CISPR22 with external filter
Flammability rating
UL 94V-0
UL/cUL 60950-1
CSA-C22.2 No.60950-1
IEC/EN 60950-1
Safety (designed to meet)
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Q12 models
Volts, max.,continuous
Volts, transient 100 mS
Q48 models
Volts, max.,continuous
Volts, transient 100 mS
On/Off Control, referred to -Vin
Volts, min.
Volts, max.
Input reverse polarity protection
Output Current, sustained short circuit
Storage Temperature Range
min. °C.
max. °C.
Lead Temperature, °C. max.(soldering, ten seconds)
See mechanical specs
Copper alloy
0.040 inches
1.016 mm
Gold plate over nickel underplate
0.352 (10)
0.352 (10)
36
50
75
100
-0.3
15
None, install external fuse
Current-limited, see specs
-55
+125
See soldering guidelines
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MDC_BEI15W.A17 Page 4 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
PERFORMANCE DATA, BEI15-050-Q12
Efficiency vs. Line Voltage and Load Current @ +25°C
Power Dissipation vs. Line Voltage and Load Current @ +25°C
85
3.0
Power Dissipation (Watts)
83
Efficiency (%)
81
79
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
77
75
2.5
2.0
1.5
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
1.0
0.5
0.3
73
0.4
0.5
0.7
0.8
0.9
1.0
1.1
1.3
1.4
1.5
Output Load Curre nt (Amps)
71
0.3
0.4
0.5
0.7
0.8
0.9
1.0
1.1
1.3
1.4
1.5
Load Curre nt (Amps)
Maximum Current Temperature Derating at Sea Level
(VIN= 9V to 36V, airflow is from pin 1 to pin 3)
Output Current (Amps)
3
2
0.33 m/s (65 LFM)
1
0
30
35
40
45
50
55
60
65
Ambient Temperature (ºC)
70
75
80
85
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MDC_BEI15W.A17 Page 5 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
PERFORMANCE DATA, BEI15-050-Q48
Efficiency vs. Line Voltage and Load Current @ +25°C
Power Dissipation vs. Load Current @ +25°C
4.0
84
80
3.5
72
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
68
64
Efficiency (%)
Power Dissipation (Watts)
76
60
56
52
48
3.0
2.5
2.0
1.5
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
1.0
44
40
0.2
0.5
0.3
0.4
0.6
0.7
0.8
1.0
1.1
1.2
1.4
0.2
1.5
0.3
0.4
0.6
Load Curre nt (Amps)
0.8
1.0
1.1
1.2
1.4
1.5
80
85
Maximum Current Temperature Derating at Sea level
(Vin = 18 to 75V, natural convection)
Maximum Current Temperature Derating at Sea Level
(VIN= 18 to 75V, airflow is from pin 1 to pin 2)
3
2
Output Load Current (Amps)
Output Current (Amps)
0.7
Output Load Curre nt (Amps)
2
0.33 m/s (65 LFM)
1
Vin = 18V
Vin = 24V
Vin = 36V
Vin = 48V
Vin = 60V
Vin = 75V
1
0
30
35
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
0
30
35
40
45
50
55
60
65
Ambient Temperature (ºC)
70
75
80
85
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MDC_BEI15W.A17 Page 6 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
PERFORMANCE DATA, BEI15-120-Q12
Efficiency vs. Line Voltage and Load Current @ +25°C
Power Dissipation vs. Load Current @ +25°C
85
3.0
Power Dissipation (Watts)
83
Efficiency (%)
81
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
79
77
2.5
2.0
1.5
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
75
1.0
73
0.5
71
0.13
0.1
0.18
0.23
0.28
0.33
0.38
0.43
0.48
0.53
0.58
0.2
0.2
0.3
0.63
0.3
0.4
0.4
0.5
0.5
0.6
0.6
Output Load Curre nt (Amps)
Load Curre nt (Amps)
Maximum Current Temperature Derating at Sea Level
(VIN= 9V to 36V, airflow is from pin 1 to pin 3)
0.8
0.75
Output Current (Amps)
0.7
0.65
0.33 m/s (65 LFM)
0.6
0.55
0.5
0.45
0.4
30
35
40
45
50
55
60
65
Ambient Temperature (ºC)
70
75
80
85
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MDC_BEI15W.A17 Page 7 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
PERFORMANCE DATA, BEI15-120-Q48
Efficiency vs. Line Voltage and Load Current @ +25°C (Vout = 12V)
Power Dissipation vs. Load Current @ +25°C
86
3.0
Power Dissipation (Watts)
83
80
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
Efficiency (%)
77
74
71
2.5
2.0
1.5
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
1.0
68
65
0.06
0.5
0.1
0.12
0.17
0.23
0.29
0.34
0.40
0.45
0.51
0.57
0.1
0.2
0.2
0.3
0.3
0.4
0.5
0.5
0.6
0.6
Output Load Curre nt (Amps)
0.62
Load Curre nt (Amps)
Maximum Current Temperature Derating at Sea Level
(VIN=24V, airflow is from pin 1 to pin 2)
Maximum Current Temperature Derating at Sea Level
(VIN= 18V, airflow is from pin 1 to pin 2)
0.65
0.65
Natural Convection
0.60
Output Current (Amps)
Output Current (Amps)
0.5 m/s (100 LFM)
0.55
0.50
0.60
0.55
0.50
20
25
30
35
40
45
50
55
60
Ambient Temperature (ºC)
65
70
75
80
85
20
Maximum Current Temperature Derating at Sea Level
(VIN= 48V, airflow is from pin 1 to pin 2)
25
30
35
40
65
70
75
80
85
75
80
85
Maximum Current Temperature Derating at Sea Level
(VIN= 75V, airflow is from pin 1 to pin 2)
0.65
0.65
0.5 m/s (100 LFM)
Natural Convection
0.60
Output Current (Amps)
Output Current (Amps)
45
50
55
60
Ambient Temperature (ºC)
0.55
0.50
0.60
0.55
0.50
20
25
30
35
40
45
50
55
60
Ambient Temperature (ºC)
65
70
75
80
85
20
25
30
35
40
45
50
55
60
Ambient Temperature (ºC)
65
70
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MDC_BEI15W.A17 Page 8 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
PERFORMANCE DATA, BEI15-150-Q12
Efficiency vs. Line Voltage and Load Current @ +25°C
Power Dissipation vs. Load Current @ +25°C
3.00
86
2.75
82
2.50
Power Dissipation (Watts)
84
Efficiency (%)
80
78
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
76
74
72
70
2.25
2.00
1.75
1.25
68
1.00
66
0.75
64
0.10
0.14
0.18
0.22
0.26
0.30
0.34
0.38
0.42
0.46
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
1.50
0.50
0.10
0.50
0.14
0.18
0.22
Load Curre nt (Amps)
Maximum Current Temperature Derating at Sea Level
(VIN= 9V to 36V, airflow is from pin 1 to pin 3)
0.26
0.30
0.34
0.38
Output Load Curre nt (Amps)
0.42
0.46
0.50
Maximum Current Temperature Derating at Sea Level
(Natural convection)
510
0.7
500
490
0.6
Output Current (mA)
Output Current (Amps)
480
0.5
0.33 m/s (65 LFM)
0.4
0.3
0.2
470
Vin = 12 V
460
Vin = 24 V
450
440
430
420
0.1
410
0
35
45
55
65
Ambient Temperature (ºC)
75
85
400
30
35
40
45
50
55
60
65
Ambient Temperature (ºC)
70
75
80
85
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MDC_BEI15W.A17 Page 9 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
PERFORMANCE DATA, BEI15-150-Q48
Efficiency vs. Line Voltage and Load Current @ +25°C
Power Dissipation vs. Line Voltage and Load Current @ +25°C
88
3.25
86
3.00
2.75
Power Dissipation (Watts)
84
Efficiency (%)
82
80
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
78
76
74
2.50
2.25
2.00
1.75
1.50
1.25
72
1.00
70
0.75
68
0.10
0.14
0.18
0.22
0.26
0.30
0.34
0.38
0.42
0.46
0.50
0.50
0.1
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
0.1
0.2
0.2
0.3
0.3
0.3
0.4
0.4
0.5
0.5
Output Load Curre nt (Amps)
Load Curre nt (Amps)
Maximum Current Temperature Derating at Sea Level
(VIN= 18 to 75V, airflow is from pin 1 to pin 2)
1
Output Current (Amps)
0.8
0.6
0.33 m/s (65 LFM)
0.4
0.2
0
30
35
40
45
50
55
60
65
Ambient Temperature (ºC)
70
75
80
85
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MDC_BEI15W.A17 Page 10 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MECHANICAL SPECIFICATIONS, OPEN FRAME
TOP VIEW
Case 69
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
24.4
0.96
Zero corner cuts for
BEI15-120-Q12 and
BEI15-150-Q12 models.
20.1
0.79
PIN #1
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
Components are shown for reference only.
27.9
1.10
INPUT/OUTPUT CONNECTIONS
Pin
Function
SIDE VIEW
8.9
0.35 MAX
1
Positive Vin
2
Negative Vin
3
On/Off Control *
4
Negative Vout
5
Common Return
6
Positive Vout
*The Remote On/Off can be provided
with either positive (P suffix) or negative (N suffix) logic.
SEATING PLANE
0.040 0.002 PIN WITH
0.071 0.002 SHOULDER
6X AT PINS 1-6
Some competitive units may use different pin
numbers; however, the BEI is plug compatible.
Follow the pin FUNCTION when laying out your
PC board.
BOTTOM VIEW (PIN SIDE)
END VIEW
20.32
0.800
0.475
REF
CL
2.54
0.100
#6
10.16
0.400
5.08
0.200
CL
#1
#5
10.16
0.400
#2
#3
CL
10.16
0.400
#4
6.3
0.25
Standard pin length is shown. Please refer to
the Ordering Guide for alternate pin lengths.
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MDC_BEI15W.A17 Page 11 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT
Anti-static foam
Label
Label
Each tray is 6 x 5 units
(30 units per tray)
SHIPPING TRAY DIMENSIONS
BEI modules are supplied in a 30-piece (6 x 5) shipping tray. The tray is an anti-static closed-cell polyethylene foam. Dimensions are shown below.
6.4
Typ
28.4
Typ
6.4
Typ
[9.92]
252.0
[9.92]
252.0
18.0
5x 38.1
25.4
Typ
190.5
Ref
R 6.4
Typ
A
252.0
Ref
A
9.5 deep
Ref
4x 44.5
22.9
252.0
Ref
177.8
Ref
19.1
Ref
9.5 [.38 in]
Pocket
Depth
19.1 [.75 in]
SECTION A-A
Notes:
1. Material: Dow 220 antistat ethafoam
(Density: 34-35 kg/m3)
2. Dimensions: 252 x 252 x 19.1 mm
6 x 5 array (30 per tray)
3. All dimensions in millimeters [inches]
4. Tolerances unless otherwise specified: +1/-0
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MDC_BEI15W.A17 Page 12 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line.
The installer must observe all relevant safety standards and regulations. For
safety agency approvals, install the converter in compliance with the end-user
safety standard.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the rising input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specifications). Once operating, converters will not turn off until
the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent
restart will not occur until the input voltage rises again above the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off operation at a
single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as poorly
regulated capacitor inputs), the converter shuts off and then restarts as the
external capacitor recharges. Such situations could oscillate. To prevent this,
make sure the operating input voltage is well above the UV Shutdown voltage
AT ALL TIMES.
Start-Up Delay
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Delay (see Specifications) is the time interval between the point when
the rising input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specified regulation
band. Actual measured times will vary with input source impedance, external
input capacitance, input voltage slew rate and final value of the input voltage
as it appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of the
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from inception to Vout regulated
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified accuracy
band. The specification assumes that the output is fully loaded at maximum
rated current.
Recommended Input Filtering
The user must assure that the input source has low AC impedance to provide
dynamic stability and that the input supply has little or no inductive content,
including long distributed wiring to a remote power supply. The converter will
operate with no additional external capacitance if these conditions are met.
For best performance, we recommend installing a low-ESR capacitor
immediately adjacent to the converter’s input terminals. The capacitor should
be a ceramic type such as the Murata GRM32 series or a polymer type. Initial
suggested capacitor values are 10 to 22 μF, rated at twice the expected maximum input voltage. Make sure that the input terminals do not go below the
undervoltage shutdown voltage at all times. More input bulk capacitance may
be added in parallel (either electrolytic or tantalum) if needed.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no additional
external capacitor. However, the user may install more external output capacitance to reduce the ripple even further or for improved dynamic response.
Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors.
Initial values of 10 to 47 μF may be tried, either single or multiple capacitors in
parallel. Mount these close to the converter. Measure the output ripple under
your load conditions.
Use only as much capacitance as required to achieve your ripple and noise
objectives. Excessive capacitance can make step load recovery sluggish or
possibly introduce instability. Do not exceed the maximum rated output capacitance listed in the specifications.
Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. The Cbus and Lbus
components simulate a typical DC voltage bus. Please note that the values of
Cin, Lbus and Cbus may vary according to the specific converter model.
TO
OSCILLOSCOPE
CURRENT
PROBE
+INPUT
VIN
+
–
+
–
LBUS
CBUS
CIN
-INPUT
CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz
CBUS = 1000μF, ESR < 100mΩ @ 100kHz
LBUS = 1μH
Figure 2: Measuring Input Ripple Current
+SENSE
+OUTPUT
C1
C2
SCOPE
RLOAD
-OUTPUT
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3: Measuring Output Ripple and Noise (PARD)
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MDC_BEI15W.A17 Page 13 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
Minimum Output Loading Requirements
All models regulate within specification and are stable under 10% minimum
load to full load conditions. Operation under no load might however slightly
increase output ripple and noise.
Thermal Shutdown
To protect against thermal overstress, these converters include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC/
DC’s to rise above the Operating Temperature Range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit.
When the temperature decreases below the turn-on threshold, the converter
will automatically restart. There is a small amount of temperature hysteresis to
prevent rapid on/off cycling.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of
conditions. The Derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is acceptable
under increasing forced airflow measured in Linear Feet per Minute (“LFM”).
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter
itself which is obviously running at higher temperature than the outside air.
Also note that very low flow rates (below about 25 LFM) are similar to “natural
convection”, that is, not using fan-forced airflow.
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airflow. We use both thermocouples and an
infrared camera system to observe thermal performance.
CAUTION: If you exceed these Derating guidelines, the converter may have
an unplanned Over Temperature shut down. Also, these graphs are all collected
near Sea Level altitude. Be sure to reduce the derating for higher altitude.
Output Current Limiting
Current limiting inception is defined as the point at which full power falls
below the rated tolerance. See the Performance/Functional Specifications.
Note particularly that the output current may briefly rise above its rated value
in normal operation as long as the average output power is not exceeded. This
enhances reliability and continued operation of your application. If the output
current is too high, the converter will enter the short circuit condition.
Output Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low (approximately 98% of nominal output voltage for most models), the PWM controller
will shut down. Following a time-out period, the PWM will restart, causing
the output voltage to begin rising to its appropriate value. If the short-circuit
condition persists, another shutdown cycle will initiate. This rapid on/off cycling
is called “hiccup mode”. The hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures and/or component
damage.
Remote On/Off Control
The remote On/Off Control can be specified with either logic logic type. Please
refer to the Connection Diagram on page 1 for On/Off connections.
Positive-logic models are enabled when the On/Off pin is left open or is
pulled high to +Vin with respect to –Vin. Therefore, the On/Off control can be
disconnected if the converter should always be on. Positive-logic devices are
disabled when the On/Off is grounded or brought to within a low voltage (see
Specifications) with respect to –Vin.
Negative-logic devices are on (enabled) when the On/Off pin 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 pulled high (see Specifications) with
respect to –Vin.
Dynamic control of the On/Off function must sink the specified signal current
when brought low and withstand the specified 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.
Output Capacitive Load
These converters do not require external capacitance added to achieve rated
specifications. Users should only consider adding capacitance to reduce
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve your noise and surge response objectives. Excess
external capacitance may cause regulation problems and possible oscillation
or instability.
The maximum rated output capacitance and ESR specification is given for a
capacitor installed immediately adjacent to the converter.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating." Any
BEI15 model may be configured to produce an output of 10V, 24V or 30V (for
±5V, ±12V or ±15V models, respectively) by applying the load across the
+Output and –Output pins, with either output grounded. The Common pin
should be left open. Minimum 20% loading is recommended under these
conditions.
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these
converters. These specifications vary depending on the solder type. Exceeding these
specifications may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
115° C.
Maximum Pot Temperature
270° C.
Maximum Solder Dwell Time
7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
6 seconds
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MDC_BEI15W.A17 Page 14 of 15
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
Emissions Performance
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
[3] Conducted Emissions Test Results
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
Test Card
Resistive Load
UUT
V+
Black
C16
C8
C8
L3
C8
L1
C8
C8
C8
C7
C3
Gnd
C4
Resistive Load
inside a metal
container
Vin+
C17
V-
Vout+
VinVout-
Figure 4. Conducted Emissions Test Circuit
Resistive Load
inside a metal
container
Graph 1. Conducted emissions performance with filter, CISPR 22, Class B, full load,
for BEI15-150-Q12P-C
[1] Conducted Emissions Parts List
Reference
L1
L3
C1, C2, C8
C7
C16, C17
C3, C4
Description
1mH, 6A
500μH,10A
2.2μfd
Electrolytic Capacitor 100μfd, 100V
.22μfd
Electrolytic Capacitor 33μfd, 100V
[2] Conducted Emissions Test Equipment Used
Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC
Rohde & Schwarz Software ESPC-1 Ver. 2.20
OHMITE 25W – 1 Ohm resistor combinations
DC Source Programmable DC Power Supply Model 62012P-100-50
Graph 2. Conducted emissions performance without filter, CISPR 22, Class B, full
load, for BEI15-150-Q12P-C
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2014 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_BEI15W.A17 Page 15 of 15