5S12.1000LV [ETC]
Analog IC ; 模拟IC\n
| 型号： | 5S12.1000LV |
| 厂家： | 
ETC |
| 描述： | Analog IC
|
| 文件： | 总8页 (文件大小：136K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
12 Watt LV Single Series DC/DC Converters
Features
!
Universal 3.5 to 16 Volt Input Range
!
Up to 12 Watts of PCB Mounted Power
!
Low and Specified Input/Output Capacitance
!
Fully Isolated, Filtered Design
!
Low Noise Outputs, Typically 40 mV P-P
!
Very Low I/O Capacitance, 375 pF Typical
!
Water Washable Shielded Copper Case
!
5 Year Warranty
Selection Chart
Input Range
Description
Output
VDC
Output
mA
VDC
The universal input of the LV single series spans 3.5 to 16
volts. This makes these converters ideal for 4.8 to 12 volt
battery and the more traditional 5 volt logic powered systems.
Model
Min
3.5
3.5
3.5
3.5
Max
16
5S3.2000LV
5S5.2000LV
5S12.1000LV
5S15.800LV
3.33
5
2000
2000
1000
800
16
Coupled with this is the very low output noise of typically 40
mV peak to peak. The noise is also fully specified for RMS
valueandifeventheseimpressivenoisefiguresaren’tenough,
ourapplicationssectionshowsasimpleaddoncircuitthatcan
16
12
15
16
powered. Full application information is provided to make
integrating this supply in your system a snap.
reduce the output noise to less than
P-P.
5
mV
Remote output voltage trim and ON/OFF functions are also
included.
Full isolation is provided to help cut ground loops in logic
powered systems that 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 heatsinking is required for most applications saving you
design time and valuable PCB space.
As with all CALEX converters the LV Single series is
covered by our 5 Year Warranty.
What all this means to you is a tighter, more compact
overall system that has the capability of being universally
12 Watt LV Single 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
12 Watt LV Single Series DC/DC Converters
Input Parameters*
Model
5S3.2000LV
5S5.2000LV
5S12.1000LV
5S15.800LV
Units
MIN
MAX
TYP
TYP
3.5
16
Voltage Range (1)
VDC
Input Current Full Load
No Load
2010
10
2880
10
3500
16
3470
20
mA
kHz
VDC
Switching Frequency
TYP
60
20
Maximum Input Overvoltage,
100ms Maximum
MAX
Turn-on Time,
1% Output Error
TYP
10
(3)
ms
Recommended Fuse
AMPS
Output Parameters*
Model
5S3.2000LV
5S5.2000LV
5S12.1000LV
5S15.800LV
Units
Output Voltage
3.30
5
12
15
VDC
MIN
TYP
MAX
MIN
MAX
TYP
MAX
TYP
MAX
3.27
3.30
3.33
0.0
4.95
5.00
5.05
0.0
11.88
12.00
12.12
0.0
14.85
15.00
15.15
0.0
Output Voltage Accuracy
Rated Load Range (11)
VDC
A
2.0
2.0
1.0
0.8
Load Regulation
25% Max Load - Max Load
Line Regulation
Vin = Min-Max VDC
0.3
0.7
0.1
0.5
%
%
0.1
0.2
Short Term Stability (4)
Long Term Stability
Transient Response (5)
Dynamic Response (6)
Noise, Peak - Peak (2)
RMS Noise
TYP
TYP
TYP
TYP
< 0.05
< 0.1
%/24Hrs
%/kHrs
µs
100
150
40
200
250
300
400
mV peak
mV P-P
mV RMS
TYP
TYP
40
6
10
TYP
MAX
50
150
Temperature Coefficient
ppm/°C
Short Circuit Protection to
Common for all Outputs
Short Term Current Limit
NOTES
All parameters measured at Tc=25°C, nominal input voltage
and full rated load unless otherwise noted. Refer to the
CALEX Application Notes for the definition of terms,
measurement circuits and other information.
(6) Dynamic response is the peak overshoot voltage during the
transient response time as defined in note 5 above.
*
(7) See applications section for more information on applying
the ON/OFF pin.
A
(1) Reduced output power available at 3.5V input. Full output power
is available above 4.6V input. See applications section for more
information.
(8) The Case is tied to the CMN output pin.
(9) 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 will reduce expected operational life.
The data sheet specifications are not guaranteed over the
functional temperature range.
(2) Noise is measured per CALEX Application Notes. Measurement
bandwidth is 0-20 MHz for peak-peak measurements, 10 kHz to
1 MHz for RMS measurements. Output noise is measured with
a 0.01µF ceramic in parallel with a 1µF/35V Tantalum capacitor
located 1" away from the converter to simulate your PCB’s
standard decoupling.
(10) The case thermal impedance is specified as the case
temperature rise over ambient per package watt dissipated.
(3) To determine the correct fuse size, see CALEX Application
Notes.
(11) No minimum load required for operation . Dynamic regulation
may degrade when run with less than 5% load.
(4) Short term stability is specified after a 30 minute warmup
at full load, constant line and recording the drift over a 24
hour period.
(12) Specifications subject to change without notice.
(5) The transient response is specified as the time required to settle
from a 50 to 75 % step load change (rise time of step = 2 µSec)
to a 1% error band.
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
12 Watt LV Single Series DC/DC Converters
General Specifications*
All Models
Units
ON/OFF Funtion
OFF Logic Level
or Tie Pin to -Input (7)
MAX
< 0.4
VDC
Open Circuit Voltage
Input Resistance
TYP
TYP
1.4
2
VDC
kohms
Converter Idle Current
ON/OFF Pin Low
TYP
6
mA
Isolation (8)
Isolation Voltage
Input to Output
10µA Leakage
Input to Output
Capacitance
MIN
TYP
700
375
VDC
pF
BOTTOM VIEW
SIDEVIEW
Output Trim Function
Trim Range
MIN
MIN
TYP
±10
10
%
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.020 inches
Input Resistance
Open Circuit Voltage
Environmental
kohms
VDC
2.5
X.XXX dimensions: ±0.005 inches
Case Operating Range
No Derating
MIN
MAX
MIN
MAX
MIN
-40
85
-50
90
-55
105
°C
°C
Case Functional Range (9)
Storage Range
Pin
1
Function
ON/OFF
-INPUT
+INPUT
+OUTPUT
CMN
°C
MAX
2
Thermal Impedance (10)
General
TYP
9.5
°C/Watt
3
4
Unit Weight
TYP
2.3
oz
5
Chassis Mounting Kit
MS8
6
TRIM
General Information
Applying The Input
The universal 3.5 to 16 volt input allows you to specify your
system for operation from any 5 volt logic supply or a 4.8 to 12
volt nominal battery input.
Figure 1 shows the recommended input connections for the
LV Single 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
The series is also mindful of battery operation for industrial,
medical control and remote data collection applications. The
remote ON/OFF pin places the converter in a very low power
mode that draws typically less than 6 mA from the input
source.
A
a catastrophic system failure.
Noise has also achieved new lows in this single design,
while the industry standard is to specify output noise as 1 to
5% peak to peak typical with no mention of measurement
bandwidth. The LV converters achieve noise levels of 40 mV
peak to peak and are fully specified and tested to a wide
bandwidth of 0-20 MHz.
Five sided shielding is standard along with specified
operation over the full industrial temperature range of -40 to
+85° C case temperature.
ON/OFF MAY BE LEFT FLOATING IF NOT USED
*
Figure 1.
If the source impedance driving the LV Converter is more than 0.05
ohms the optional capacitor C2 may be required (See text for more
information). Optional transient protector diode D1 may be used if
desired for added protection. The fuse serves as a catastrophic
failure protector and should not be omitted.
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
12 Watt LV Single Series DC/DC Converters
When using the LV Single be sure that the impedance at
the decision of how you define how big is big enough.
the input to the converter is less than 0.05 ohms from DC to
about 100 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 is 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.
Startup Current Demand
Because the LV Single appears as a constant power load to
your source and operation starts at about 3 volts, you should
besurethatyoursourcecansupplytherequiredcurrentatlow
voltages when starting. If this presents a problem the ON/OFF
pin and a simple voltage detector (comparator) may be used
to prevent startup until some higher steady state voltage.
The maximum 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 9 volt input. The impedance
reduces as the input voltage is raised or lowered or the power
is reduced. In general you should keep the peak to peak
voltage measured across the input pins less than 0.15 volts
peak to peak (not including the high frequency spikes) for
maximum converter performance and life.
Generally this is not a problem with battery powered
circuits and only appears when the LV Single is powered by
marginally sized 5 or 12 volt linear supplies that can’t supply
the required startup current. See the”Input Current Vs. Line
Input” curve for the low voltage current requirements of the LV
Single.
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.
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 5 mA RMS (Vin = 5 V, 10 kHz to 1
MHz bw). See the discussion above for the optimum selection
of C2.
Picking An External Input Capacitor
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.
Several system tradeoffs 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.
L1 = 10µH
C1 = 10µF / 25V, TANTALUM
C2 = SEE TEXT
There is no one optimum value for the input capacitor. The
size and capacity depend on the following factors:
Figure 2.
1) Expected ambient temperature and your temperature
derating guidelines.
This circuit will reduce the input reflected ripple current to less than
5 mA RMS. See the discussion in the text for help on the optimum
selection of C2. L1 should be sized to handle the maximum input
current at your lowest operating voltage and maximum expected
output power.
2) Your ripple current derating guidelines.
A
3) The maximum anticipated load on the converter.
4) The input operating voltage, both nominal and
excursions.
Suggested Capacitor Sources
5) The statistical probability that your system will spend
a significant time at any worst case extreme.
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.
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.
Factors3and4realisticallydeterminetheworstcaseripple
current rating required for the capacitor along with the RMS
ripple current curve.
United Chemi-Con SXE, RXC, RZ and RZA series
Suggested Part:
SXE025VB820M12.5X20LL
820µF, 25V, 105°C Rated
ESR=0.085 ohms
Factor 5 is not easy to quantify. At CALEX we can make no
assumptions about a customers system so we leave to you
Allowable Ripple at 85 °C = 1.96 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
4
12 Watt LV Single Series DC/DC Converters
Nichicon
Suggested Part:
PR and PF series
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.
UPR1E222MRH
2200uF, 25V, 105°C Rated
ESR=0.053 ohms
Allowable Ripple at 85°C = 1.98 A
Panasonic
Suggested Part:
HFG and HFQ Series
ECEA1EFE332L
Output Power
300uF, 25V, 105°C Rated
ESR=0.045 ohms
Allowable Ripple at 85°C = 1.94 A
The available output power of the LV Single is reduced when
operating below 4.6 volts. See the “Low Voltage Power” curve
for more information. In general, from 4.6 to 16 volts full power
is available from the LV Single. Below 4.6 volts input the
available output power is linearly derated from 100% at 4.6
volts to 50% at 3.5 volts. For example a 5S12.1000LV is
capable of providing 6 watts of output power at 3.5 volts input.
Remote ON/OFF Pin Operation
The remote ON/OFF pin may be left floating if this function is
not used. The best way to drive this pin is with an open
collector/drain or relay contact.
Ultra Low Noise Output Circuit
Do not drive this input from a logic gate directly. The ON/
OFF pin must be left floating to turn the converter on and
insure proper operation. This input is noise sensitive so it
should not be routed all over your PCB.
The circuit shown in figure 4 can be used to reduce the output
noise to below 5 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 LV Single as possible, even if your load is at some
distance from the converter.
When the ON/OFF pin is pulled low with respect to the -
Input, the converter is placed in a low power drain state. The
ON/OFF pin turns the converter off while keeping the input
bulk capacitors fully charged, this prevents the large inrush
current spike that occurs when the +input pin is opened and
closed.
The ON/OFF pin should never be pulled more that 0.3 volts
below the -Input or have a voltage of greater than +2 volts
applied to it.
Applying The Output
Figure 3 shows typical output connections for the LV Single.
In most applications no external output capacitance will be
necessary. Only your normal 1 to 10 µF tantalum and 0.001
to 0.1 µF ceramic bypass capacitors sprinkled around your
circuit as needed locally are required. Do not add extra output
capacitance and cost to your circuit “Just Because”.
L1 = 10µH
C1 = 100µF / 25V, ALUMINUM
C2 = 10µF / 25V, TANTALUM
Figure 4.
This circuit can reduce the output noise to below 5 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.
A
Operation With Very Light Loads
The LV Single conserves power when operating at very light
loads by operating in a burst power mode. This may cause the
output noise to increase with a repetition rate of 10’s of
milliseconds. If this causes a problem the LV Single may be
operated with a pre-load of about 5% of it’s full rated power.
The exact value will depend on the external components in
your system.
Turning the converter OFF with the remote ON/OFF pin is
an attractive alternative when your load needs to be shut
down.
Figure 3.
The LV Single may be directly connected to your load without any
external components required for most applications. Transient
overvoltage diode D1 may be added for extra protection against
output faults or if the input has the possibility of being shorted to the
load.
Dynamic response of the LV Single will degrade when the
unit is operated with less than 25% of full rated power.
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
12 Watt LV Single Series DC/DC Converters
Remote Sense
current is not increased over the listed maximum when
trimming the output voltage down.
The simple circuit of figure 5 may be used to add remote
sensing to the LV single series. This circuit might be useful
when your actual load is at some distance from the converter
and you want to automatically compensate for voltage drops.
Othersituationswherethiscircuitisusefulare:Compensating
for the voltage drop through a connector and creating a very
stiff load voltage even when the load varies greatly. The circuit
shown is for a 5 volt output, change R4 for other output
voltages.
Down trim actually can reduce the minimum input voltage
in some circuits. Full up trim may not be achievable at
minimum input voltage and full rated load.
Non Standard Output Voltages
The 12 and 15 volt LVs will typically trim much lower than the
-10% specified. This allows the 12 and 15 volt LV’s to be
trimmed lower than specified for RF or other special
applications.
4
The 12 volt LV’s can be typically trimmed over a range of
8.7 to 13.3 volts. The 15 volt LV’s can be typically trimmed
over a range of 9.8 to 16.8 volts.
CALEX
5S5.2000LV
DC/DC CONVERTER
Grounding
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 10 µF, 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.
6
5
R1 = 470 OHM, 1/4W, 5%
R2 = 1.0K, 1/4W, 5%
R3 = 2.4K, 1/4W, 5%
C1 = 0.01µF, 100V, CER
D1 = 1N4448
Q1 = 2N3906
R4, R5 = 4.99K, 1/4W, 5%
IC1 = TL431CLP
Figure 5.
Also see the CALEX application note “Dealing With
CommonModeNoise”formoreinformationonusingcommon
grounds.
This simple circuit may be added to provide for remote sensing and
automatic correction of the load voltage. See our application note on
this circuit for more information.
Case Grounding
Output Trimming
The copper case serves not only as a heat sink but also as a
EMI shield. The 0.017 inch thick case provides >25 dB of
absorption loss to both electric and magnetic fields at 220
kHz, while at the same time providing 20 to 40 % better heat
sinkingovercompetitivethinsteel,aluminumorplasticdesigns.
The trim pin may be used to adjust the outputs by up to ±10
% from the nominal factory setting. The trim may be used to
adjust for system wiring voltage drops or to adjust the +5
output up to 5.2 volts for ECL applications. Figure 6 shows the
proper connections to use the trim pin. If output trimming is not
desired the trim pin may be safely left floating.
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
A
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.
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.
Figure 6.
Temperature Derating
Output trimming may be accomplished by using a single fixed
resistor or a trimpot as shown. When using fixed resistors the values
may range from 0 to infinity ohms. See the text for more information
on output power when trimming. The trimpot should be 10K for 3 and
5 volt outputs and 20K for 12 and 15 volt outputs.
TheLVSingleseriescanoperateupto85°Ccasetemperature
withoutderating.Casetemperaturemayberoughlycalculated
from ambient by knowing that the case temperature rise is
approximately 9.5°C per package watt dissipated.
Trimming the output up reduces the output current
proportionally to keep the maximum power constant. Output
For example: If a 12 volt output converter is delivering 9
watts with a 5 volt input, at what ambient could it expect to run
with no moving air and no extra heatsinking?
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
12 Watt LV Single Series DC/DC Converters
Efficiency of the converter is approximately 72% at 9 watts
of output power, this leads to an input power of about 13 watts.
The case temperature rise would be 13 - 9 watts or 4 watts ×
9.5 = 38°C. This number is subtracted from the maximum
case temperature of 85°C to get: 47°C.
This example calculation is for an LV Single without any
extraheatsinkingorappreciableairflow. Bothofthesefactors
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.
This is a rough approximation to the maximum ambient
temperature. Because of the difficulty of defining ambient
temperature and the possibility that the load’s dissipation may
actually increase the local ambient temperature significantly,
these calculations should be verified by actual measurement
before committing to a production design.
Remember, it is the system designers responsibility to be
sure that the case temperature of the LV Single does not
exceed 85°C for maximum reliability in operation.
Typical Performance (Tc=25°C, Vin=Nom VDC, Rated Load).
EFFICIENCY Vs. LOAD
INPUT CURRENT Vs. LINE INPUT VOLTAGE
OUTPUT IMPEDANCE Vs. FREQUENCY
85
80
75
70
65
60
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
10
LINE = 5 VDC
1
12/15 V OUTPUT
5 V OUTPUT
LINE = 16 VDC
100% LOAD
.1
50% LOAD
.01
0
10
20
30
40
50
60
70
80
90
100
0
2
4
6
8
10
12
14
16
10
100
1000
10000
100000
1000000
LOAD (%)
LINE INPUT (VOLTS)
FREQUENCY (Hz)
A
EFFICIENCY Vs. LINE INPUT VOLTAGE
RMS INPUT CURRENT Vs LINE INPUT
LOW VOLTAGE POWER AVAILABLE
85
80
75
70
65
2.5
2.0
1.5
1.0
0.5
0.0
120
100
80
60
40
20
0
100% LOAD
75% LOAD
50% FULL LOAD
100% FULL LOAD
50% LOAD
4
6
8
10
12
14
16
4
6
8
10
12
14
16
3.50
3.75
4.00
4.25
4.50
4.75
5.00
LINE INPUT(VOLTS)
LINE INPUT (VDC)
LINE INPUT (VDC)
NOTES ON USING THE CURVES
2) The efficiency curves are for 12 volt output. To use the curves
for other models adjust as follows:
1) The input currents are for 12 watts of input power. For 3.33 volt
output models the input current is approximately 40% less. For
5 volt output models the current is approximately 16% less.
3 volt models subtract approximately 4%
5 volt models subtract approximately 2%
15 volt models add approximately 1%
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
7
12 Watt LV Single Series DC/DC Converters
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
8
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