The failure rate (λ) and mean time between failures
(MTBF= 1/ λ) is calculated at max output power and
an operating ambient temperature (T
A
) of +40°C. CUI
Power Modules uses Telcordia SR-332 Issue 2 Method 1 to
calculate the mean steady-state failure rate and standard
deviation (σ).
Telcordia SR-332 Issue 2 also provides techniques to
estimate the upper confidence levels of failure rates based
on the mean and standard deviation.
Mean steady-state failure rate, λ Std. deviation, σ
421 n F ailures/h
60.9 nF ailures/h
the responsibility of the installer to ensure that the
final product housing these components complies with
the requirements of all applicable safety standards and
regulations for the final product.
Component power supplies for general use should comply
with the requirements in IEC/EN/UL 60950 1 Safety
of Information Technology Equipment. Product related
standards, e.g. IEEE 802.3af Power over Ethernet, and
ETS 300132 2 Power interface at the input to telecom
equipment, operated by direct current (dc) are based on
IEC/EN/UL 60950 1 with regards to safety.
CUI Power Modules DC/DC converters and DC/DC
regulators are UL 60950-1 recognized and certified in
accordance with EN 60950-1. The flammability rating for
all construction parts of the products meet requirements
for V-0 class material according to IEC 60695-11-10, Fire
hazard testing, test flames – 50 W horizontal and vertical
flame test methods.
Isolated DC/DC converters
Galvanic isolation between input and output is verified
in an electric strength test and the isolation voltage
(V
iso
) meets the voltage strength requirement for basic
insulation according to IEC/EN/UL 60950-1.
It is recommended to use a slow blow fuse at the input
of each DC/DC converter. If an input filter is used in the
circuit the fuse should be placed in front of the input filter.
In the rare event of a component problem that imposes a
short circuit on the input source, this fuse will provide the
following functions:
• Isolate the fault from the input power source so as not to
affect the operation of other parts of the system
• Protect the distribution wiring from excessive current and
power loss thus preventing hazardous overheating
The DC/DC converter output is considered as safety extra
low voltage (SELV) if one of the following conditions is
met:
•The input source has double or reinforced insulation from
the AC mains according to IEC/EN/UL 60950-1
•The input source has basic or supplementary insulation
from the AC mains and the input of the DC/DC converter
is maximum 60 Vdc and connected to protective earth
according to IEC/EN/UL 60950-1
•The input source has basic or supplementary insulation
from the AC mains and the DC/DC converter output is
connected to protective earth according to IEC/EN/UL
60950-1
Non - isolated DC/DC regulators
The DC/DC regulator output is SELV if the input source
meets the requirements for SELV circuits according to IEC/
EN/UL 60950-1.
MTBF (mean value) for the NEB series = 2.91 Mh.
MTBF at 90% confidence level = 2.37 Mh
Compatability with RoHS requirements
The products are compatible with the relevant clauses
and requirements of the RoHS directive 2011/65/EU and
have a maximum concentration value of 0.1% by weight
in homogeneous materials for lead, mercury, hexavalent
chromium, PBB and PBDE and of 0.01% by weight in
homogeneous materials for cadmium.
Exemptions in the RoHS directive utilized in CUI
Power Modules products are found in the Statement of
Compliance document.
Safety Specification
General Information
CUI Power Modules DC/DC converters and DC/DC
regulators are designed in accordance with the safety
standards IEC60950-1, EN60950-1 and UL60950-1 Safety
of Information Technology Equipment
IEC/EN/UL60950-1 contains requirements to prevent
injury or damage due to the following hazards:
•
•
•
•
•
•
Electrical Shock
Energy hazards
Fire
Mechanical and heat hazards
Radiation hazards
Chemical hazards
On-board DC/DC converters and DC/DC regulators are
defined as component power supplies. As components
they cannot fully comply with the provisions of any
safety requirements without “conditions of acceptability”.
Clearance between conductors and between conductive
parts of the component power supply and conductors on
the board in the final product must meet the applicable
safety requirements. Certain conditions of acceptability
apply for component power supplies with limited stand-off
(see Mechanical Information for further information). It is
cui.com
For more information, please visit the
product page.
CUI Inc
│
SERIES:
NEB-N
│
DESCRIPTION:
FULLY REGULATED ADVANCED BUS CONVERTERS
date
11/07/2014
│
page
4 of 30
Absolute Maximum Ratings
parameter
operating temperature (T
P1
)
storage temperature (T
S
)
input voltage (V
I
)
isolation voltage (V
iso
)
input voltage transient (V
tr
)
remote control pin voltage (V
RC
)
input to output test voltage, see note 1
according to ETSI EN 300 132-2 and Telcordia GR-
1089-CORE
see operating information section
-0.3
conditions/description
see thermal consideration section
min
-40
-55
-0.5
typ
max
+125
+125
+80
+65*
2250
+100
+80*
18
units
°C
°C
V
Vdc
V
V
Stress in excess of Absolute Maximum Ratings may cause permanent damage. Absolute Maximum Ratings, sometimes referred to as no destruction limits, are normally tested with one
parameter at a time exceeding the limits in the Electrical Specification. If exposed to stress above these limits, function and performance may degrade in an unspecified manner.
Note 1: Isolation voltage (input/output to base-plate) max 750 Vdc.
* Applies for the narrow input version V
I
= 40-60 V
Fundamental Circuit Diagram
+IN
Driver
+OUT
-OUT
-IN
Auxillary
Supply
Driver
Control
RC
RC isolation
Functional Description
T
P1
, T
P3
= -40 to +90ºC, V
I
= 36 to 75 V.
Typical values given at: T
P1
, T
P3
= +25°C, V
I
= 53 V, max I
O
, unless otherwise specified under Conditions
Configuration File: 190 10-CDA 102 0315/001
parameter
fault protection
characteristics
input under voltage lockout
(UVLO)
output voltage - under voltage
protection
output voltage - over voltage
protection
over current protection (OCP)
over temperature protection
(OTP)
fault limit
setpoint accuracy
hysteresis
delay
fault limit
fault response time
fault limit
fault response time
setpoint accuracy (I
O
)
fault limit
fault response time
fault limit
hysteresis
fault response time
cui.com
-6
0
32
0.5
2
300
0
200
15.6
200
25
200
125
10
300
6
1
V
V
V
μs
V
μs
V
μs
%
A
μs
C
C
μs
º
º
conditions/description
min
typ
max
units
For more information, please visit the
product page.
CUI Inc
│
SERIES:
NEB-N
│
DESCRIPTION:
FULLY REGULATED ADVANCED BUS CONVERTERS
date
11/07/2014
│
page
5 of 30
Electrical Specification
12 V, 22 A, 264 W
T
P1
= -40 to +90ºC, V
I
= 36 to 75V.
Typical values given at: T
P1
= +25°C, V
I
= 53 V, max I
O
, unless otherwise specified under Conditions.
Additional C
in
= 0.1 mF, C
out
= 0.1 mF. See Operating Information section for selection of capacitor types.
Configuration File: 19010-CDA 102 0315/001
parameter
input voltage range (V
I
)
turn-off input voltage (V
Ioff
)
turn-on input voltage (V
Ion
)
internal input capacitance (C
I
)
output power (P
O
)
efficiency (η)
power dissipation (P
d
)
input idling power (P
li
)
input standby power (P
RC
)
switching frequency (f
s
)
output voltage setting and ac-
curacy (V
Oi
)
output voltage tolerance band
(V
O
)
idling voltage (V
O
)
line regulation (V
O
)
load regulation (V
O
)
load transient voltage deviation
(V
tr
)
load transient recovery time
(t
tr
)
ramp-up time (t
r
) - (from
10−90% of V
Oi
)
start-up time (t
s
) - (from V
I
connection to 90% of V
Oi
)
V
I
shut-down fall time (t
f
) -
(from V
I
off to 10% of V
O
)
RC start-up time (t
RC
)
RC shut-down fall time (t
RC
) -
(from RC off to 10% of V
O
)
output current (I
O
)
current limit threshold (I
lim
)
short circuit current (I
sc
)
recommended capacitive load
(C
out
)
output ripple & noise (V
Oac
)
over voltage protection (OVP)
remote control (RC)
V
O
= 10.8 V, T
P1
< max T
P1
T
P1
= 25ºC, see Note 1
T
P1
= 25ºC, see Note 2
See ripple & noise section, V
Oi
T
P1
= +25°C, V
I
= 53 V, 10-100 % of max I
O
sink current (note 3), see operating information
trigger level, decreasing RC-voltage
trigger level, increasing RC-voltage
0
50% of max I
O
max I
O
50% of max I
O
,
V
I
= 48 V
max I
O
,
V
I
= 48 V
max I
O
I
O
= 0 A, V
I
= 53 V
V
I
= 53 V (turned off with RC)
0-100% of max I
O
T
P1
= +25°C, V
I
= 53 V, I
O
= 12 A
0-100% of max I
O
I
O
= 0 A
max I
O
V
I
= 53 V, 1-100% of max I
O
V
I
= 53 V, load step 25-75-25% of max I
O
, di/dt =
1 A/μs, C
out
= 2.2 mF OSCON type
V
I
= 53 V, load step 25-75-25% of max I
O
, di/dt =
1 A/μs, C
out
= 2.2 mF OSCON type
10-100% of max I
O
10-100% of max I
O
max I
O
I
O
= 0 A
max I
O
max I
O
I
O
= 0 A
0
24
25
1.1
2.2
50
15.6
2.6
2.9
0.7
6
100
11.88
11.76
11.88
100
30
±350
200
8
23
0.7
6
12
3
6
22
26
0
94.7
94.5
95.2
94.8
15.5
3.5
0.4
180
12.0
12.12
12.24
12.12
200
100
22
decreasing input voltage
increasing input voltage
conditions/description
min
36
32
34
33
35
11
264
typ
max
75
34
36
units
V
V
V
μF
W
%
%
%
%
W
W
W
kHz
V
V
V
mV
mV
mV
µs
ms
ms
ms
s
ms
ms
s
A
A
A
mF
mVp-p
V
mA
V
V
Note
1: OCP in hic-up mode
2: Low ESR-value
3: Sink current drawn by external device connected to the RC pin. Minimum sink current required to guarantee activated RC function.
