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 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 NQB series = 2.9 Mh.
MTBF at 90% confidence level = 2.4 Mh
Compatibility 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
Reliability
CUI Power Modules DC/DC converters and DC/DC
regulators are designed in accordance with the safety
standards IEC 60950 1, EN 60950 1 and UL 60950 1
Safety of Information Technology Equipment.
IEC/EN/UL 60950 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
the responsibility of the installer to ensure that the final
product housing these components complies with
cui.com
For more information, please visit the
product page.
CUI Inc
│
SERIES:
NQB-D
│
DESCRIPTION:
FULLY REGULATED ADVANCED BUS CONVERTERS
date
11/07/2014
│
page
4 of 36
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
)
SALERT, CTRL, SCL, SDA, SA0,
SA1 (V Logic I/O)
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
-0.3
conditions/description
see thermal consideration section
min
-40
-55
-0.5
typ
max
+125
+125
+80
+65*
2250
+100
+80*
18
3.6
units
°C
°C
V
Vdc
V
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 of Output data or Electrical Characteristics. 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
cui.com
For more information, please visit the
product page.
CUI Inc
│
SERIES:
NQB-D
│
DESCRIPTION:
FULLY REGULATED ADVANCED BUS CONVERTERS
date
11/07/2014
│
page
5 of 36
Functional Description
T
P1
, T
P3
= -40 to +90ºC, V
I
= 36 to 75 V, sense pins connected to output pins unless otherwise specified under Conditions.
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 0314/001
parameter
PMBus monitoring accuracy
input voltage (VIN_READ)
output voltage (VOUT_READ)
output current (IOUT_READ)
temperature (TEMP_READ)
fault protection
characteristics
factory default
setpoint accuracy
hysteresis: factory default
hysteresis: configurable via PMBus of threshold
range, note 1
delay
factory default
configurable via PMBus, note 1
fault response time
factory default
configurable via PMBus, note 1
fault response time
setpoint accuracy (I
O
)
IOUT_OC_FAULT_LIMIT factory default
IOUT_OC_FAULT_LIMIT, configurable via PMBus,
note 1
fault response time
OTP_FAULT_LIMIT, factory default
OTP_FAULT_LIMIT, configurable via PMBus, note 1
hysteresis, factory default
hysteresis, configurable via PMBus, note 1
fault response time
-2
0
33
2
300
0
0
200
15.6
200
41
200
-50
0
125
10
300
125
125
16
2
V
%
V
V
μs
V
V
μs
V
V
μs
%
A
A
μs
ºC
ºC
ºC
ºC
μs
V
I
= 53V
V
I
= 53V, 50-100% of max I
O
V
I
= 53V, 10% of max I
O
-2
-1.0
-6
-0.6
-5
±0.2
±0.1
±0.15
±3.5
2
1.0
6
0.6
5
%
%
%
A
ºC
conditions/description
min
typ
max
units
input under voltage lockout
(UVLO)
output voltage - under voltage
protection (VOUT_UV_FAULT_
LIMIT)
output voltage - over voltage
protection (VOUT_OV_FAULT_
LIMIT)
V
OUT
-6
0
16
6
100
over current protection (OCP)
over temperature protection
(OTP)
logic input/output
characteristics
logic input low (V
IL
)
logic input high (V
IH
)
logic output low (V
OL
)
logic output high (V
OH
)
bus free time T(BUF)
Note
CTRL, SA0, SA1, PG, SCL, SDA
CTRL, SA0, SA1, PG, SCL, SDA
CTRL, PG, SALERT, SCL, SDA
I
OL
= 6 mA
CTRL, PG, SALERT, SCL, SDA
I
OH
= -6 mA
note 2
2.7
1.3
2.1
1.1
V
V
0.25
V
V
μs
1: See Operating Information section.
2: PMBus timing parameters according to PMBus spec.
Abstract: In order to generate a stable excitation signal, the design of a digital frequency synthesizer is implemented on FPGA using Verilog hardware language. The design includes accumulator, wav...[Details]
Power management solutions for today's portable application processors are becoming increasingly integrated. Total power consumption, standby and sleep current consumption affect battery size, bill...[Details]
1 Introduction
As an emerging microfabrication technology, micro-electromechanical system (MEMS) technology has begun to be applied in various fields. It can integrate functions such as inform...[Details]
0 Introduction
With the development of society, people pay more and more attention to security work. Monitoring products have been used in various fields instead of being used only in importan...[Details]
The automotive lighting and signal control system is responsible for controlling the vehicle's lighting, signal lights, electric horns, reversing and brake buzzers. Traditional automotive lighting...[Details]
The typical fault troubleshooting listed below is for reference of maintenance personnel.
When the computer is turned on, the indicator light is off and there is no screen display
Mainte...[Details]
Flooded Batteries
This battery developed in Germany can be used to power flashlights, strobe lights and toys as long as it is filled with water. This battery can be stored for 50 years and can...[Details]
This controller uses PIC16C54 single-chip microcomputer as the controller, and it is very easy to use: just connect a telephone line to the loudspeaker through the controller, and you can rem...[Details]
Introduction
Liquid crystal, as a display device, is widely used in low-power products such as instruments, meters, and electronic equipment with its unique advantages. In the past, the displ...[Details]
To understand how and why OLED power supply affects display image quality, you must first understand OLED display technology and power supply requirements. This article will explain the latest OLED...[Details]
introduction
Incandescent bulbs can emit a variety of light, but in specific applications, only green, red, and yellow light are usually needed - such as traffic lights. If an incand...[Details]
Introduction
In industrial control, speed measurement is often required. Generally, a contact tachometer is used. This tachometer must be placed against the center of the shaft to measure. It...[Details]
1 Introduction
With the rapid economic development, my country's electricity demand has been growing at a rate of more than 20% per year. According to the current economic development trend an...[Details]
This article discusses the six design steps of LED lighting system design in detail: (1) determine the lighting requirements; (2) determine the design goals and estimate the optics; (3) the efficie...[Details]
Applying fieldbus technology on new beer production lines is the first choice for large beer companies with strong management level and technical strength. Guangzhou Zhujiang Beer Group Co., Ltd. i...[Details]
京公网安备 11010802033920号
EEWORLD
