48D15.330WD [ETC]
Analog IC ; 模拟IC\n
| 型号： | 48D15.330WD |
| 厂家： | 
ETC |
| 描述： | Analog IC
|
| 文件： | 总6页 (文件大小：105K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
10 Watt WD Dual Series DC/DC Converters
Features
!
Isolated Dual Outputs
!
Universal 18 to 72 volt input range
!
Up to 10 Watts of PCB Mounted Power
!
Efficiencies to > 80%
!
Fully Isolated, Filtered Design
!
Low Noise Outputs
!
Very low I/O Capacitance, 375 pF typical
!
Water Washable Shielded Copper Case
!
Five Year Warranty
Description
Selection Chart
Input Range
VDC
TheuniversalinputoftheWDDualseriesspans18to72volts.
This makes these converters ideal for 24 and 48 volt battery,
process control and telecom applications.
Output
mA
Model
Power
W
Min
Max
VDC
Coupled with these features is a low output noise of
typically less than 80 mV peak to peak. The noise is also fully
specified for RMS value and if even these impressive noise
figures aren’t enough, our applications section shows a
simple add on circuit that can reduce the output noise to less
than 10 mV p-p.
48D5.800WD
48D12.415WD
48D15.330WD
18
18
18
72
72
72
±5
±800
±415
±330
8
±12
±15
10
10
What all this means to you is a tighter, more compact
overall system that has the capability of being universally
powered. Full application information is provided to make
integrating this supply in your system a snap.
Full isolation is provided to help cut ground loops in
industrial systems, where unknown input power quality could
create havoc with sensitive, high precision analog circuitry.
Other input and output voltage combinations may be
factory ordered, contact CALEX applications engineering at
1-800-542-3355 for more information.
No extra components or heatsinking are required for most
applications saving you design time and valuable PCB space.
10 Watt Dual WD Series Block Diagram
A
2401 Stanwell Drive
•
Concord, California 94520
•
Ph: 925/687-4411 or 800/542-3355
•
Fax: 925/687-3333
•
www.calex.com
•
Email: sales@calex.com
3/2001
1
10 Watt WD Dual Series DC/DC Converters
Input Parameters*
Model
48D5.800WD
48D12.415WD
48D15.330WD
Units
MIN
MAX
18
72
2
18
72
4
18
72
4
Voltage Range
VDC
Input Current No Load
Full Load
TYP
mA
210
265
260
Efficiency
TYP
TYP
79
78
79
%
Switching Frequency
120
kHz
Maximum Input
Overvoltage,
100ms Maximum
Turn-on Time,
1% Output Error
MAX
TYP
85
VDC
10
(2)
ms
Recommended Fuse
AMPS
Output Parameters*
Model
48D5.800WD
48D12.415WD
48D15.330WD
Units
Output Voltage
±5
±12
±15
VDC
MIN
±4.950
±5.000
±5.050
±11.900
±12.000
±12.100
±14.900
±15.000
±15.100
Output Voltage Accuracy TYP
MAX
VDC
mA
%
MIN
Rated Load Range (3)
MAX
0
±800
0
±415
0
±330
Load Regulation:
25% Max Load to
MAX
TYP
0.3
1.0
0.2
1.0
0.2
1.0
Max Load (4)
Cross Regulation (5)
TYP
3
1
1
%
%
Line Regulation
Vin = 18 - 72 VDC
TYP
MAX
0.3
0.75
0.1
0.5
0.1
0.5
Short Term Stability (6)
Long Term Stability
Noise, Peak - Peak (1)
RMS Noise
TYP
TYP
TYP
TYP
< 0.01
< 0.1
80
%/24Hrs
%/kHrs
110
30
80
20
mV P-P
mV RMS
20
TYP
MAX
50
250
Temperature Coefficient
Short Circuit Protection
ppm/°C
Short Term Current Limit
NOTES
AllparametersmeasuredatTc=25°C,nominalinputvoltage
and full rated load unless otherwise noted. Refer to the
(5) Cross regulation is defined for loading/unloading one output
while the other output is kept at full load. Load range is
*
CALEX Application Notes for the definition of
measurement circuits and other information.
terms,
25 to 100%.
A
(6) Short term stability is specified after a 30 minute warmup
at full load, constant line and recording the drift over a 24
hour period.
(1) Noise is measured per CALEX application notes. Measurement
bandwidth is 0-20 MHz. RMS noise is measured over a 0.01-1
MHzbandwidth.TosimulatestandardPCBdecouplingpractices,
output noise is measured with a 10µF tantalum and 0.01µF
ceramic capacitor located 1 inch away from the converter. Input
ripple is measured into a 10µH source impedance.
(7) Case is tied to the CMN output pin.
(8) Thefunctionaltemperaturerangeisintendedtogiveanadditional
data point for use in evaluating this power supply. At the
low functional temperature the power supply will function with
no side effects, however sustained operation at the high
functional temperature may reduce the expected operational
life. The data sheet specifications are not guaranteed over
the functional temperature range.
(2) See our application note for picking the correct fuse size.
(3) The converter may be safely operated at any load from zero to
the full rating. Dynamic response of the converter may degrade
if the converter is operated with less than 25% output load.
(4) Load regulation is defined for loading/unloading both outputs
simultaneously. Load range is 25 to 100%.
(9) Thecasethermalimpedanceisspecifiedasthecasetemperature
rise over ambient per package watt dissipated.
(10) Specifications subject to change without notice.
2401 Stanwell Drive
•
Concord, California 94520
•
Ph: 925/687-4411 or 800/542-3355
•
Fax: 925/687-3333
•
www.calex.com
•
Email: sales@calex.com
3/2001
2
10 Watt WD Dual Series DC/DC Converters
General Specifications*
All Models
Units
Isolation (7)
Isolation Voltage
Input to Output
10µA Leakage
Input to Output
Capacitance
MIN
TYP
1544
375
VDC
pF
Environmental
MIN
MAX
MIN
MAX
MIN
MAX
TYP
-40
85
-50
100
-55
105
Case Operating Range
°C
°C
BOTTOM VIEW
SIDEVIEW
Case Functional Range (8)
Storage Range
°C
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.020 inches
Thermal Impedance (9)
General
16
°C/Watt
X.XXX dimensions: ±0.005 inches
Unit Weight
TYP
1.2
oz
Chassis Mounting Kits
MS6, MS8, MS15
Pin
1
Function
+INPUT
-INPUT
2
3
+OUTPUT
CMN
4
5
-OUTPUT
Applications Information
Applying The Input
You truly get what you pay for in a CALEX converter, a
complete system oriented and specified DC/DC converter -
no surprises, no external noise reduction circuits needed, no
heatsinking problems, just “plug and play”.
Figure 1 shows the recommended input connections for the
WD Dual DC/DC converter. A fuse is recommended to protect
the input circuit and should not be omitted. The fuse serves to
prevent unlimited current from flowing in the case of a
catastrophic system failure.
A
The WD Dual series like all CALEX converters carries the
full 5 year CALEX no hassle warranty. We can offer a five year
warranty where others can’t because with CALEX it’s rarely
needed.
Keep reading, you’ll find out why.
General Information
The universal 18 to 72 volt input allows you to specify your
system for operation from any 24 or 48 volt nominal input.
Five sided shielding is standard along with specified
operation over the full industrial temperature range of -40 to
+85°C case temperature.
Figure 1.
If the source impedance driving the WD Converter is more than
about 0.3 ohms at 120 kHz the optional capacitor C1 may be
required (See text for more information). Optional transient protec-
tor diodes may be used if desired for added input and output
protection. The output can be used as a 10, 24 or 30 V single output
as shown.
2401 Stanwell Drive
•
Concord, California 94520
•
Ph: 925/687-4411 or 800/542-3355
•
Fax: 925/687-3333
•
www.calex.com
•
Email: sales@calex.com
3/2001
3
10 Watt WD Dual Series DC/DC Converters
When using the WD Dual be sure that the impedance at the
the decision of how you define how big is big enough.
input to the converter is less than 0.3 ohms from DC to about
120 kHz, this is usually not a problem in battery powered
systems when the converter is connected directly to the
battery. If the converter is located more than about 1 inch from
the input source an added capacitor may be required directly
at the input pins for proper operation.
Suitable capacitors for use at the input of the converter are
given at the end of this section.
Very Low Noise Input Circuit
Figure 2 shows a very low noise input circuit that may be used
with the converters. This circuit will reduce the input reflected
ripple current to less than 10 mA peak-peak (Vin = 48 V, 10
kHz to 1 MHz bw). See the discussion above for the optimum
selection of C1.
The maximum permissible source impedance is a function
of output power and line voltage. The impedance can be
higher when operating at less than full power. The minimum
impedance is required when operating with a 18 volt input at
full load. In general you should keep the voltage measured
across the input pins less than 0.5 volts peak to peak (not
including the high frequency spikes) for maximum converter
performance.
There is no lower limit on the allowed source impedance,
it can be any physically realizable value, even approaching 0.
If the source impedance is too large in your system you
should choose an external input capacitor as detailed below.
L1 = 20 µH
C1= See Text
Picking An External Input Capacitor
C2= 10 µF/100 V, 0.25 - 1 ohm ESR
If an input capacitor is needed at the input to the converter it
must be sized correctly for proper converter operation. The
curve “RMS Input Current Vs Line Input” shows the RMS
ripple current that the input capacitor must withstand with
varying loading conditions and input voltages.
Figure 2.
This circuit will reduce the input reflected ripple current to less than
10 mA peak to peak. See the discussion in the text for help on the
optimum selection of C1. L1 should be sized to handle the maximum
inputcurrentatyourlowestoperatingvoltageandmaximumexpected
output power.
Several system tradeoff’s must be made for each particular
system application to correctly size the input capacitor.
Theprobableresultofundersizingthecapacitorisincreased
self heating, shortening it’s life. Oversizing the capacitor can
have a negative effect on your products cost and size,
although this kind of overdesign does not result in shorter life
of any components.
Suggested Capacitor Sources
These capacitors may be used to lower your sources input
impedance at the input of the converter. These capacitors will
work for 100% load, worst case input voltage and ambient
temperature extremes. They however, may be oversized for
your exact usage, see “Picking An External Input Capacitor”
above for more information. You may also use several smaller
capacitorsinparalleltoachievethesameripplecurrentrating.
This may save space in some systems.
There is no one optimum value for the input capacitor. The
size and capacity depend on the following factors:
1) Expected ambient temperature and your temperature
derating guidelines.
Suitablecapacitorscanbefoundfromthefollowingsources:
2) Your ripple current derating guidelines.
SXEA, RXC, RZ and RZA series
United Chemi-Con
Suggested Part:
3) The maximum anticipated load on the converter.
4) The input operating voltage, both nominal and excursions.
SXE100VB33RM10X15LL
33µF, 100V, 105° C RATED
ESR=0.3 OHMS
5) The statistical probability that your system will spend a
significant time at any worst case extreme.
Allowable Ripple at 85°C = 0.8A
Nichicon
Suggested Part:
PR and PF series
UPR2A100MHH
100µF, 100V, 105°C RATED
ESR=0.18 OHMS
Allowable Ripple at 85°C = 0.8A
Factors 1 and 2 depend on your system design guidelines.
These can range from 50 to 100% of the manufacturers listed
maximum rating, although the usual derating factor applied is
about 70%. 70% derating means if the manufacturer rated the
capacitor at 1 A RMS you would not use it over 0.7 A RMS in
your circuit.
Panasonic
Suggested Part:
TS-NH Series
ECES2AG331D
330µF, 100V, 105°C RATED
ESR=0.2 OHMS
Allowable Ripple at 85°C = 1.1A
Factors3and4realisticallydeterminetheworstcaseripple
current rating required for the capacitor along with the RMS
ripple current curve.
Factor 5 is not easy to quantify. At CALEX we can make no
assumptions about a customers system so we leave to you
2401 Stanwell Drive
•
Concord, California 94520
•
Ph: 925/687-4411 or 800/542-3355
•
Fax: 925/687-3333
•
www.calex.com
•
Email: sales@calex.com
3/2001
4
10 Watt WD Dual Series DC/DC Converters
Grounding
Applying The Output
Figure 1 shows typical output connections for the WD Dual. In
most applications no external output capacitance will be
necessary. Only your normal 1 to 10µF tantalum and 0.001 to
0.1µFceramicbypasscapacitorssprinkledaroundyourcircuit
as needed locally are required. Do not add extra output
capacitance and cost to your circuit “Just Because”.
The input and output sections are fully floating from each
other. They may be operated fully floating or with a common
ground. If the input and output sections are connected either
directly at the converter or at some remote location from the
converter it is suggested that a 1 to 10µF, 0.5 to 5 ohm ESR
capacitor bypass be used directly at the converters output
pins. These capacitors prevent any common mode switching
currents from showing up at the converters output as normal
mode output noise. See “Applying the Output” for more
information on selecting output capacitors.
If you feel you must add external output capacitance, do
not use the lowest ESR, biggest value capacitor that you can
find! This can only lead to reduced system performance or
oscillation. See our application note “Understanding Output
Impedance For Optimum Decoupling” for more information
and by all means use our low noise circuit provided.
Also see the CALEX application note “Dealing With
CommonModeNoise”formoreinformationonusingcommon
grounds.
Single Ended 10, 24 or 30 V Outputs
The dual outputs may also be used in a single ended mode as
shown in figure 1 to get 10, 24 or 30 volts of output at the full
rated power levels. To use the single ended mode just
connect your load to the + and - Output pins and leave the
CMN pin floating.
Case Grounding
The copper case serves not only as a heat sink but also as a
EMI shield. The 0.017 inch thick case provides >20 dB of
absorption loss to both electric and magnetic fields at 120
kHz, while at the same time providing 20 to 40 % better heat
sinkingovercompetitivethinsteel,aluminumorplasticdesigns.
Ultra Low Noise Output Circuit
The case shield is tied to the CMN output pin. This
connection is shown on the block diagram. The case is
floating from the input sections. The input is coupled to the
outputs only by the low 375 pF of isolation capacitance. This
low I/O capacitance insures that any AC common mode noise
on the inputs is not coupled to your output circuits.
The circuit shown in figure 3 can be used to reduce the output
noise to below 10 mV p-p over a 20 MHz bandwidth. Size
inductor L1 appropriately for the maximum expected load
current. All of the ground connections must be as short as
possible back to the CMN pin. The filter should be placed as
close to the WD Dual as possible, even if your load is at some
distance from the converter.
Compare this isolation to the more usual 1000 - 2000 pF
found on competitive designs and you will see that CALEX
provides the very best DC and AC isolation available. After all,
you are buying an isolated DC/DC to cut ground loops. Don’t
let the isolation capacitance add them back in.
Temperature Derating
The WD Dual series can operate up to 85°C case temperature
withoutderating.Casetemperaturemayberoughlycalculated
from ambient by knowing that the case temperature rise is
approximately 16°C per package watt dissipated.
For example: If a WD Dual converter is delivering 8 Watts
L1 = 20 µH
with a 48 volt input, at what ambient could it expect to run with
A
C1= 22 µF / 20 V, Tantalum
no moving air and no extra heatsinking?
C2= 0.01 µF / 100 V, Ceramic
Efficiency of the converter is approximately 80% at 8 watts
of output power, this leads to an input power of about 10
Watts. The case temperature rise would be 10 - 8 Watts or 2
Watts x 16 = 32°C. This number is subtracted from the
maximum case temperature of 85°C to get: 53°C.
Figure 3.
This circuit can reduce the output noise to below 10 mV p-p over a
20 MHz bandwidth. Size inductor L1 appropriately for the maximum
expected load current. The filter should be constructed as close as
possible to the converter and all of the ground connections must be
as short as possible back to the CMN pin.
This example calculation is for a WD Dual without any extra
heat sinking or appreciable air flow. Both of these factors can
greatly effect the maximum ambient temperature (see below).
Exact efficiency depends on input line and load conditions,
check the efficiency curves for exact information.
Operation With Very Light Loads
Dynamic response and cross regulation of the WD Dual will
degrade when the unit is operated with less than about 25%
of full rated power. If this is a problem the most lightly loaded
output may be “Pre-Loaded” with a resistor to common as
needed.Theexactamountofpreloadingrequiredisdependent
on your system requirements, so some experimentation is
necessary to arrive at the optimum value.
This is a rough approximation to the maximum ambient
temperature. Because of the difficulty of defining ambient
temperature and the possibility that the loads dissipation may
actually increase the local ambient temperature significantly,
these calculations should be verified by actual measurement
before committing to a production design.
2401 Stanwell Drive
•
Concord, California 94520
•
Ph: 925/687-4411 or 800/542-3355
•
Fax: 925/687-3333
•
www.calex.com
•
Email: sales@calex.com
3/2001
5
10 Watt WD Dual Series DC/DC Converters
Typical Performance (Tc=25°C, Vin=Nom VDC, Rated Load).
EFFICIENCY Vs. LINE INPUT VOLTAGE
EFFICIENCY Vs. LOAD
90
85
80
75
70
90
85
80
75
70
LINE = 18VDC
LINE = 48VDC
50% FULL LOAD
100% FULL LOAD
LINE = 72VDC
15
25
35
45
55
65
75
0
10
20
30
40
50
60
70
80
90
100
LINE INPUT(VOLTS)
LOAD (%)
INPUT CURRENT Vs. LINE INPUT VOLTAGE
RMS INPUT CURRENT Vs. LINE INPUT
1.0
0.8
0.6
0.4
0.2
0.0
0.8
0.6
0.4
0.2
0.0
100% LOAD
100% LOAD
75% LOAD
50% LOAD
50% LOAD
0
10
20
30
40
50
60
70
80
15
25
35
45
55
65
75
LINE INPUT (VOLTS)
LINE INPUT (VDC)
A
2401 Stanwell Drive
•
Concord, California 94520
•
Ph: 925/687-4411 or 800/542-3355
•
Fax: 925/687-3333
•
www.calex.com
•
Email: sales@calex.com
3/2001
6
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