WALL LV12S26-150

TECHNICAL DATASHEET
Rev. C
LV12S26-150
Low Voltage DC-DC Converter
10-36 Vdc Input
26Vdc Output at 5.8A
Half-Brick Package
Features:
Applications:
•
Up to 86% Efficient
•
Cost Efficient Solution
•
Delivering 5.8A at Room Temperature with No
Added Heat Sink with 400 LFM
•
Fixed Switching Frequency
•
High Reliability
•
Consult Factory for Optional Heat Sink
•
Output Short Circuit Protection
•
Output Over Current Protection
•
Optional Encapsulation for added Ruggedness
•
For use in 12V and 24V battery applications.
•
Remote ON/OFF
•
For use in Intermediate and Distributed Bus
Architectures (IBA)
•
Remote Sense Compensation to 10% Vout
•
Telecommunication equipment
•
Fast Transient Response
•
•
100% Burn In
Network (LANs/WANs) Equipment
•
Next generation low voltage, high current
microprocessors and Ics
Description:
The LV12S26-150 is a high density, low input voltage, isolated converter with a wide input voltage range.
Low input voltage converters are uncommon in the industry and the LV12S26-150 offers the flexibility of
operation with both 12V and 24V busses. This state-of-the-art converter’s features include fast transient
response, short circuit protection, over current protection, and many other features that are required for
today’s demanding applications.
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1 of 15
Rev. C
Technical Specifications
TECHNICAL DATASHEET
LV12S26-150
Model No. LV12S26-150
All specifications are based on 25 oC, Nominal Input Voltage and Maximum Output Current unless otherwise noted.
We reserve the right to change specifications based on technological advances.
SPECIFICATION
Related condition
Min
Nom
Max
Switching Frequency
350
INPUT (Vin)
Operating Voltage Range
10
12 / 24
36
UVLO Turn On at
9.4
9.5
9.6
UVLO Turn Off at
9.3
9.4
9.5
Maximum Input Current
Low Line
6.3
No Load Input Current
No Load
0.15
Input Current under “Remote Off”
0.0064
Reflected Ripple Current
225
84.5
EFFICIENCY
OUTPUT (Vo)
25.74
26.26
Voltage Set Point
±RS shorted to ±Vo
26.0
-1%
+1%
23.4
28.6
Voltage Adjustment
Max Output limited to 150W
26.0
-10%
+10%
Load Regulation
±RS shorted to ±Vo
0.1
0.2
Line Regulation
±RS shorted to ±Vo
0.1
0.2
Temperature Drift
0.2
15.15
Remote Sense Compensation
Max Output limited to 150W
10%
Ripple
1uF Ceramic &10uF Tantalum
360
Spikes
1uF Ceramic &10uF Tantalum
Current
0.6
5.8
Power Limited-Dependent upon SENSE
Current Limit
10
compensation and TRIM adjustment
Over Voltage Limit
Output Clamped
1uF Ceramic & 10uF Tantalum
DYNAMIC RESPONSE
50% to 100% Io, di/dt=1A/uS
200
Load step / ∆ V
Recovery Time
Recovery to within 1% Nominal Vo
Turn On Delay
From Vin(min) to Vout (nom)
Turn On Overshoot
Full Load Resistive
Hold Up Time
From Vin (min) to VULVO_Turn_Off
0
REMOTE ON/OFF
Active High
Remote ON – Active High
Min High (ON/OFF pin)
2.2
Remote ON – Active Low
Max Low (ON/OFF pin)
N/A
Remote OFF – Active High
Max Low (ON/OFF pin)
1.2
Remote OFF – Active Low
Min High (ON/OFF pin)
N/A
Remote ON/OFF pin Floating – Active High
Over Operating Voltage Range
2.5
5.0
Remote ON/OFF pin Floating – Active Low
Over Operating Voltage Range
N/A
ION/OFF Sink to pull low – Active Low or High
VON/OFF =0V, Vin=36V
0.38
ION/OFF Source to drive high – Active High
VON/OFF =5V, Vin=36V
0.03
ION/OFF Source to drive high – Active Low
VON/OFF =5V, Vin=36V
Turn On Delay – Active High
ON/OFF (max Low) to Vout (min)
9
Turn Off Delay – Active High
ON/OFF (0V) to Vout (min)
160
ISOLATION
Input-Output
1 minute
1500
Input-Case
1 minute
500
Output-Case
1 minute
500
THERMAL
Ambient
Max. Ambient limited by OTP
-40
25
OTP
Over Temperature Protection (OTP)
Case Temperature Greater than
95
Turn On (OTP)
Case Temperature Less than
85
Calculated Using Bellcore TR-332 Method 1 case 3
2,563,116
MTBF
MECHANICAL
See Figure 1
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Unit
kHz
Vdc
Vdc
Vdc
A
A
A
mA
%
Vdc
%
Vdc
%
%
% / oC
Vdc
%
mVpk-pk
mVpk-pk
A
A
Vdc
mV
ms
ms
%
mS
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mA
mA
mA
ms
uS
Vdc
Vdc
Vdc
o
C
C
o
C
hours
o
Page 2 of 15
Rev. C
TECHNICAL DATASHEET
LV12S26-150
Table 1: Pin Assignments
Pin #
1
2
3
4
5
6
7
8
Pin Name
-Vo
-RS
Trim
+RS
+Vo
-Vin
CHGND
Key Pin/NC
9
ON/OFF
10
+Vin
Function
Negative Output
Negative Remote Sense
Output Voltage Trim
Positive Remote Sense
Positive Output
Negative Input
Chassis Ground (Case)
To Key Converter
Remote On/Off
Comments
If not used, leave open or short to -Vo
Refer to page 6
If not used, leave open or short to +Vo
If not used, leave open
Leave as a No Connect pin
If not used, leave floating for Active High Unit
If not used, short to –Vin on an Active Low Unit
Positive Input
Figure 1: Mechanical Dimensions
NOTES:
1. PIN TO PIN TOLERANCE ± .01 [±0.3],
PIN DIAMETER TOLERANCE: ±.005 [±0.13].
2. CASE MATERIAL: .040 [1.02] THICK, ALUMINUM ALLOY 3003-0,
PER: QQA 250/2.
3. UNLESS OTHERWISE SPECIFIED.
TO ORDER:
4. UNIT COMES WITH EITHER 3M x 0.5 THREADED THRU
INSERTS OR FOR Ø.125 THRU-HOLE ADD: “TH” SUFFIX TO
MODEL PART NUMBER.
EXAMPLE: LV12S15-100TH
5. CONSULT FACTORY FOR OPTIONAL HEAT SINK.
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Page 3 of 15
TECHNICAL DATASHEET
Rev. C
LV12S26-150
DESIGN CONSIDERATIONS
Under Voltage Lock Out (UVLO)
The converter output is disabled until the input voltage exceeds the UVLO turn-on limit. The converter will
remain ON until the input voltage falls below the UVLO turn-off limit.
Over Current Protection
The converter is protected from short circuit and over current conditions. During these fault conditions, the
converter output will ‘hiccup’. The converter output will recover once the short or over current fault is removed.
Over Temperature Protection (OTP)
The converter has internal thermal protection that will shut the converter OFF once the case temperature exceeds
the OTP turn-off limit. The converter will resume operation when the case temperature has dropped below the
OTP turn-on limit.
Input Filter
It is recommended to bypass the +Vin and –Vin pins of the converter with a minimum of 680uF (50V minimum)
capacitor (UCC - SXE50VB681M12X35LL). No other bypassing is needed. However, to reduce the input ripple
beyond what is seen in Photo 1, larger values of capacitance may be used in conjunction with a ceramic capacitor.
Additionally, an inductor may be placed between the source and the previously mentioned capacitor. No inductor
should be placed between the capacitor and the input to the converter. It is important to note that placement of the
input filter must be as close as possible to the input pins of the converter to assure a low impedance at the pins.
Figure 2: Input Filter Setup
+Vin
Low
Impedance
Source
680 µF
1 µF
electrolytic
capacitor
ceramic
capacitor
LV12S26-150
-Vin
Output Filter
No additional output capacitor is needed for the power supply to operate. However, to reduce the ripple and noise
on the output, additional capacitance may be added. A low ESR Ceramic capacitor may be added across the +Vo
and –Vo pins to reduce the ripple and spike noise. Additional capacitance in the form of a tantalum or aluminum
electrolytic may also be placed across these pins in order reduce ripple and improve the transient peak-to-peak
voltage deviation.
Remote Sense
To improve the regulation at the load, route the connections from the -RS and the +RS pins to the –Vo and +Vo
connections at the load. This will force the converter to regulate the voltage at the load and not at the pins of the
converter (refer to Graph 6). If it is not desired to use the Remotes Sense feature, the –RS and +RS pins may be
left open or they may be shorted to the -Vo and +Vo pins respectively. Shorting the RS pins to the Vo pins will
reduce the voltage drops through the converter pins.
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TECHNICAL DATASHEET
Rev. C
LV12S26-150
Remote ON/OFF
The converter has the ability to be remotely turned ON or OFF. The LV series is Active-High. Active-High
means that a logic high at the ON/OFF pin will enable the supply (Figure 3). With Active-High, if the ON/OFF
pin is left floating, the supply will be enabled.
Figure 3: Active-High
LV Series Converter
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Page 5 of 15
TECHNICAL DATASHEET
Rev. C
LV12S26-150
Output Voltage Trim: (24V, 26V, and 28V Models)
The output is adjustable +/–10% of rated output voltage. To trim the output voltage up, place the trim resistor
between the Trim and –Rs pins (Figure 5). To trim the output voltage down, place the trim resistor between the
Trim and +Rs pins (Figure 4).
The value of the trim resistor with respect to the desired output voltage (Vo) can be derived from the following
formulas or looked up on the trim table (Table 2).
RTH =
RTL =
Vref
− R lim
Vo − Vref Vref
−
RH
RL
Vo − Vref
− R lim
Vref Vo − Vref
−
RL
RH
(in Kohms)
Figure 5: Trim Up
Figure 4: Trim Down
+Vout
+Vout
+Rs
+Rs
RTL
Pins Facing Down
(in Kohms)
Trim
Rload
Pins Facing Down
Rload
Trim
RTH
-Rs
-Rs
-Vout
-Vout
Table 2: Trim Equations for LV Series (24V, 26V, and 28V Models)
Vonom
26.000
Vref
2.495
Percent
Trim
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
Trim Low
Vo
RTL
25.740 2342.17
25.480 1100.90
25.220 711.89
24.960 521.71
24.700 408.96
24.440 334.34
24.180 281.31
23.920 241.68
23.660 210.95
23.400 186.41
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RH
24.00
RL
2.55
Rlim RTH to -Rs
8.25 RTL to +Rs
Trim High
Vo
RTH
26.260 203.60 All in Kohms
26.520 102.10
26.780 66.35
27.040 48.10
27.300 37.02
27.560 29.59
27.820 24.25
28.080 20.23
28.340 17.09
28.600 14.58
Note that while decreasing the output voltage, the
maximum output current still remains at 5.8A, and
while increasing the output voltage, the output
current is reduced to maintain a total output power
at 150 W.
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Page 6 of 15
Rev. C
TECHNICAL DATASHEET
LV12S26-150
Paralleling Converters
The LV series converters may be paralleled both for redundancy and for higher output current. However, in order
to do this, a high-current, low Vf, schottky diode must be placed at the +Vo pin of each supply as shown in Figure
6. To improve sharing, tie the two TRIM pins together. The converters may be trimmed by adding a resistor value
from Table 2 from each TRIM pin to ±RS pin, or alternatively, a single resistor of half the value of Table 2 from
the common TRIM pins to the common ±RS pins.
Figure 6: Paralleling Converters
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TECHNICAL DATASHEET
Rev. C
LV12S26-150
Effiency (%)
Graph 1: LV12S26-150 Efficiency vs. Output Current
90%
89%
88%
87%
86%
85%
84%
83%
82%
81%
80%
79%
78%
77%
76%
75%
74%
73%
72%
71%
70%
69%
68%
67%
66%
65%
64%
63%
62%
0.00
Vin=10V
Vin=12V
Vin=24V
Vin=36V
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
5.50
6.00
Io (A)
Graph 2: LV12S26-150 Max Ambient vs. Io
5.8
5.4
5.0
4.6
4.2
Io (A)
3.8
3.4
3.0
No Airflow - 12Vin
2.6
No Airflow - 24Vin
2.2
400 LFM - 12Vin
1.8
400 LFM - 24Vin
1.4
1.0
0.6
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
Ambient (°C)
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Page 8 of 15
Rev. C
TECHNICAL DATASHEET
LV12S26-150
Graph 3: LV12S26-150 Power Dissipation vs. Input Voltage
34
32
30
28
26
24
22
Pdiss (W)
20
18
16
14
12
Io=0.6A
Io=1.0A
Io=2.0A
Io=3.0A
Io=4.0A
Io=5.0A
Io=5.8A
10
8
6
4
2
0
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
Vin(V)
Graph 4: LV12S26-150 Input Current vs. Input Voltage
20
Io=0.6A
18
Io=1.0A
Io=2.0A
16
Io=3.0A
Io=4.0A
14
Io=5.0A
Iin (A)
12
Io=5.8A
10
8
6
4
2
0
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
Vin(V)
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Page 9 of 15
TECHNICAL DATASHEET
Rev. C
LV12S26-150
0.100%
0.095%
0.090%
0.085%
0.080%
0.075%
0.070%
0.065%
0.060%
0.055%
0.050%
0.045%
0.040%
0.035%
0.030%
0.025%
0.020%
0.015%
0.010%
0.005%
0.000%
Graph 6: LV12S26-150 Load Regulation
(+RS to +Vo, -RS to -Vo)
Vin=10V
Vin=12V
Vin=24V
Vin=36V
Regulation (%)
Regulation (%)
Graph 5: LV12S26-150 Load Regulation
(±RS Pins Open)
0.6
1.0
2.0
3.0
4.0
5.0
0.100%
0.095%
0.090%
0.085%
0.080%
0.075%
0.070%
0.065%
0.060%
0.055%
0.050%
0.045%
0.040%
0.035%
0.030%
0.025%
0.020%
0.015%
0.010%
0.005%
0.000%
5.8
Vin=10V
Vin=12V
Vin=24V
Vin=36V
0.60
1.00
2.00
Io (A)
0.075%
Io=0.6A
Io=1A
Io=2A
Io=3A
Io=4A
Io=5A
Io=5.8A
0.060%
0.055%
5.80
Io=0.6A
Io=1A
Io=2A
Io=3A
Io=4A
Io=5A
Io=5.8A
0.070%
0.065%
0.060%
0.055%
0.050%
Regulation (%)
0.050%
Regulation (%)
5.00
Graph 8: LV12S26-150 Line Regulation
(+RS to +Vo, -RS to -Vo)
0.075%
0.065%
4.00
Io (A)
Graph 7: LV12S26-150 Line Regulation
(±RS Pins Open)
0.070%
3.00
0.045%
0.040%
0.035%
0.030%
0.045%
0.040%
0.035%
0.030%
0.025%
0.025%
0.020%
0.020%
0.015%
0.015%
0.010%
0.010%
0.005%
0.005%
0.000%
0.000%
10
12
24
36
10
12
24
36
Vin (V)
Vin (V)
Note: Voltage measurements taken where the output pins are
soldered into test board.
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Page 10 of 15
Rev. C
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TECHNICAL DATASHEET
LV12S26-150
Photo 1: Remote Turn On
Vin=24V, Iout = 0.6A
Photo 2: Remote Turn On
Vin=24V, Iout = 5.8A,
Photo 3: Normal Turn On
Vin=24V, Iout = 0.6A
Photo 4: Normal Turn On
Vin=24V, Iout = 5.8A
Photo 5: Remote Turn Off
Vin=24V, Iout = 0.6A
Photo 6: Remote Turn Off
Vin=24V, Iout = 5.8A
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Page 11 of 15
TECHNICAL DATASHEET
Rev. C
LV12S26-150
Photo 7: Transient Response 50% to 100%
Vin=24V, Iout = 2.9 to 5.8A
Cout=1uF Ceramic + 10uF Tantalum
Photo 8: Transient Response 10% to 100%
Vin=24V, Iout = 0.6 to 5.8A
Cout=1uF Ceramic + 10uF Tantalum
Photo 9: Output Voltage Ripple (20 MHz BW)
Vin=24V, Iout=0.6A
Cout=1uF Ceramic + 10uF Tantalum
Photo 10: Output Voltage Ripple (20 MHz BW)
Vin=24V, Iout=5.8A
Cout=1uF Ceramic + 10uF Tantalum
Photo 11: Output Voltage Ripple (Spike)
Vin=24V, Iout = 5.8A
Cout=1uF Ceramic + 10uF Tantalum
Photo 12: Input Reflected Ripple Voltage and Ripple Current
Vin=24V, Iout = 5.8A
with a 680uF Aluminum Electrolytic and 12uH series inductor.
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Page 12 of 15
TECHNICAL DATASHEET
Rev. C
LV12S26-150
TEST SETUP:
The LV12S26-150 specifications are tested with the following configurations:
Regulation and Efficiency Setup
To ensure that accurate measurement are taken, the voltage measurements are taken directly at the terminal of the
module. This minimizes errors due to contact and trace lengths between the load and the output of the supply. The
following is a diagram of the test setup.
Figure 7: Regulation and Efficiency Probe Setup
Rtrace
Rcontact +Vin
+Vout Rcontact
Vin
Rtrace
Rload
Vout
Rcontact
Rcontact
-Vin
Rtrace
Rtrace
-Vout
Output Ripple Voltage Setup
The module is tested with a 1uF ceramic capacitor in parallel with a 10uF tantalum capacitor across the output
terminals.
Figure 8: Ripple Voltage Probe Setup
SCOPE
PROBE
+Vout
LV12S26-150
1 µF
10 µF
Tantalum
-Vout
Ceramic
Rload
Input Reflected Ripple Current and Input Ripple Current Setup
The module is tested for input reflected ripple current (Irrc) and input ripple current (Irc). The input ripple voltage
is also measured at the pins with the following input filter. If there is a need to reduce input ripple current/voltage
then additional ceramic capacitors can be added to the input of the converter.
Figure 9: Ripple Current Setup
Irrc
SCOPE
PROBE
Irc
12 µH
+Vin
Low
Impedance
Source
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6,800 µF
1 µF
electrolytic
capacitor
ceramic
capacitor
LV12S26-150
-Vin
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Page 13 of 15
TECHNICAL DATASHEET
Rev. C
LV12S26-150
Converter Thermal Consideration
The converter is designed to operate without convective cooling if the derating curves are followed. The converter
can operate at higher temperatures if airflow is applied. Airflow should be aligned lengthwise to the converter for
optimum heat transfer. Contact Factory for derating curves.
Figure 10: Airflow Orientation
+Vin
ON/OFF
Pins Facing Down
LV12S26-150
-Vin
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+Vout
-Vout
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Page 14 of 15
Rev. C
TECHNICAL DATASHEET
LV12S26-150
Company Information:
Wall Industries, Inc. has created custom and modified units for over 40 years. Our in-house research and
development engineers will provide a solution that exceeds your performance requirements on-time and on budget.
Our ISO9001-2000 certification is just one example of our commitment to producing a high quality, well
documented product for our customers.
Our past projects demonstrate our commitment to you, our customer. Wall Industries, Inc. has a reputation for
working closely with its customers to ensure each solution meets or exceeds form, fit and function requirements.
We will continue to provide ongoing support for your project above and beyond the design and production phases.
Give us a call today to discuss your future projects.
Contact Wall Industries for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
(888) 597-WALL
(603)778-2300
(888)587-9255
(603)778-9797
[email protected]
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5 Watson Brook Rd.
Exeter, NH 03833
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