LV12S24-150-S [WALL]
Low Voltage DC-DC Converter 10-36 Vdc Input 24Vdc Output at 6.25A Half-Brick Package; 低压DC -DC转换器10-36 VDC输入24V直流输出6.25A时半砖封装
| 型号： | LV12S24-150-S |
| 厂家： | 
WALL INDUSTRIES,INC. |
| 描述： | Low Voltage DC-DC Converter 10-36 Vdc Input 24Vdc Output at 6.25A Half-Brick Package |
| 文件： | 总15页 (文件大小：452K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TECHNICAL DATASHEET
Rev. D
LV12S24-150
Low Voltage DC-DC Converter
10-36 Vdc Input
24Vdc Output at 6.25A
Half-Brick Package
Features:
•
•
•
Up to 86% Efficient
Cost Efficient Solution
Delivering 6.25A 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
Remote ON/OFF
Applications:
•
For use in 12V and 24V battery applications.
•
For use in Intermediate and Distributed Bus
Architectures (IBA)
Remote Sense Compensation to 10% Vout
Fast Transient Response
•
•
•
Telecommunication equipment
100% Burn In
Network (LANs/WANs) Equipment
Next generation low voltage, high current
microprocessors and Ics
Description:
The LV12S24-150 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 LV12S24-150 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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TECHNICAL DATASHEET
Rev. D
LV12S24-150
Technical Specifications
Model No. LV12S24-150
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
Switching Frequency
INPUT (Vin)
Related condition
Min
Nom
Max
Unit
-
400
-
kHz
Operating Voltage Range
UVLO Turn On at
10
9.4
9.3
-
12 / 24
9.5
36
9.6
9.5
-
Vdc
Vdc
Vdc
A
UVLO Turn Off at
9.4
Maximum Input Current
No Load Input Current
Input Current under “Remote Off”
Reflected Ripple Current
EFFICIENCY
Low Line
No Load
6.3
-
0.15
0.0064
225
-
A
-
-
A
-
-
mA
%
-
84.5
-
OUTPUT (Vo)
Voltage Set Point
23.76
24.24
+1%
26.4
+10%
0.2
Vdc
%
±RS shorted to ±Vo
24.0
24.0
-1%
21.6
Voltage Adjustment
Max Output limited to 150W
Vdc
-10%
Load Regulation
Line Regulation
Temperature Drift
±RS shorted to ±Vo
±RS shorted to ±Vo
-
-
-
0.1
0.1
0.2
%
0.2
%
-
% / oC
Vdc
%
15.15
10%
-
Remote Sense Compensation
Max Output limited to 150W
-
Ripple
Spikes
Current
1uF Ceramic &10uF Tantalum
1uF Ceramic &10uF Tantalum
-
-
360
mVpk-pk
mVpk-pk
A
-
0.6
-
14
-
6.25
Power Limited-Dependent upon SENSE
compensation and TRIM adjustment
Output Clamped
Current Limit
-
-
-
-
A
Over Voltage Limit
DYNAMIC RESPONSE
Load step / ∆ V
Vdc
1uF Ceramic & 10uF Tantalum
50% to 100% Io, di/dt=1A/uS
Recovery to within 1% Nominal Vo
From Vin(min) to Vout (nom)
Full Load Resistive
-
-
-
-
200
-
-
-
-
mV
ms
ms
%
Recovery Time
Turn On Delay
Turn On Overshoot
Hold Up Time
From Vin (min) to VULVO_Turn_Off
Active High
0
-
-
mS
REMOTE ON/OFF
Remote ON – Active High
Min High (ON/OFF pin)
Max Low (ON/OFF pin)
Max Low (ON/OFF pin)
Min High (ON/OFF pin)
Over Operating Voltage Range
Over Operating Voltage Range
VON/OFF =0V, Vin=36V
2.2
-
-
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mA
mA
mA
ms
Remote ON – Active Low
N/A
-
-
Remote OFF – Active High
-
-
1.2
Remote OFF – Active Low
N/A
-
-
Remote ON/OFF pin Floating – Active High
Remote ON/OFF pin Floating – Active Low
ION/OFF Sink to pull low – Active Low or High
ION/OFF Source to drive high – Active High
ION/OFF Source to drive high – Active Low
Turn On Delay – Active High
Turn Off Delay – Active High
2.5
-
5.0
N/A
-
-
-
-
-
-
-
-
-
0.38
VON/OFF =5V, Vin=36V
0.03
VON/OFF =5V, Vin=36V
-
-
-
-
ON/OFF (max Low) to Vout (min)
ON/OFF (0V) to Vout (min)
9
160
uS
ISOLATION
Input-Output
1 minute
1 minute
1 minute
-
-
-
1500
500
-
-
-
Vdc
Vdc
Vdc
Input-Case
Output-Case
500
THERMAL
Ambient
Max. Ambient limited by OTP
-40
25
95
OTP
oC
Over Temperature Protection (OTP)
Turn On (OTP)
MTBF
Case Temperature Greater than
-
-
-
-
oC
Case Temperature Less than
85
oC
Calculated Using Bellcore TR-332 Method 1 case 3
2,563,116
hours
MECHANICAL
See Figure 1
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TECHNICAL DATASHEET
Rev. D
LV12S24-150
Table 1: Pin Assignments
Pin #
Pin Name
Function
Negative Output
Comments
1
2
3
4
5
6
7
8
-Vo
-RS
Negative Remote Sense
Output Voltage Trim
Positive Remote Sense
Positive Output
If not used, leave open or short to -Vo
Trim
Refer to page 6
+RS
If not used, leave open or short to +Vo
+Vo
-Vin
Negative Input
Chassis Ground (Case)
CHGND
If not used, leave open
Key Pin/NC To Key Converter
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
9
ON/OFF
+Vin
Remote On/Off
Positive Input
10
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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TECHNICAL DATASHEET
Rev. D
LV12S24-150
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 (100V minimum)
capacitor. 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. 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.
Figure 2: Input Filter Setup
+Vin
Low
Impedance
LV12S24-150
680 µF
electrolytic
capacitor
1 µF
ceramic
capacitor
Source
-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. D
LV12S24-150
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
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TECHNICAL DATASHEET
Rev. D
LV12S24-150
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).
V
ref
RTH =
− Rlim
ref
(in Kohms)
Vo
−Vref
V
−
R
H
RL
V
o
−Vref
−Vref
RTL =
− Rlim
(in Kohms)
V
R
ref
V
o
−
L
R
H
Figure 5: Trim Up
Figure 4: Trim Down
+Vout
+Rs
+V
+Rs
RTL
Rload
Pins Facing Down
Rload
Pins Facing Down Trim
Trim
RTH
-Rs
-Rs
-V
-Vout
Table 2: Trim Equations for LV Series (24V, 26V, and 28V Models)
Vonom
24.000
Vref
2.495
RH
22.00
RL
2.55
Rlim RTH to -Rs
8.25 RTL to +Rs
Percent
Trim
1%
Trim Low
Trim High
Vo
RTL
Vo
RTH
23.760 1787.71 24.240 241.81 All in Kohms
23.520 915.94 24.480 111.20
23.280 609.27 24.720 70.22
23.040 452.73 24.960 50.17
22.800 357.76 25.200 38.29
22.560 294.00 25.440 30.42
22.320 248.23 25.680 24.83
22.080 213.79 25.920 20.65
21.840 186.93 26.160 17.41
21.600 165.40 26.400 14.82
2%
3%
Note that while decreasing the output voltage, the
maximum output current still remains at 6.25A, and
while increasing the output voltage, the output
current is reduced to maintain a total output power at
150 W.
4%
5%
6%
7%
8%
9%
10%
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TECHNICAL DATASHEET
Rev. D
LV12S24-150
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. D
LV12S24-150
Graph 1: LV12S24-150 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%
Vin=10V
Vin=12V
Vin=24V
Vin=36V
1
2
4
5
6
Io (A)
Graph 2: LV12S24-150 Max Ambient vs. Io (Vin=12V)
7
6
5
4
3
2
1
0
No Airflow
with 400lfm Air
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
Ambient (°C)
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TECHNICAL DATASHEET
Rev. D
LV12S24-150
Graph 3: LV12S24-150 Power Dissipation vs. Input Voltage
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
Io=1.563A
Io=3.125A
Io=4.688A
Io=6.25A
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: LV12S24-150 Input Current vs. Input Voltage
20
18
16
14
12
10
8
Io=1.563A
Io=3.125A
Io=4.688A
Io=6.25A
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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TECHNICAL DATASHEET
Rev. D
LV12S24-150
Graph 5: LV12S24-150 Load Regulation
Graph 6: LV12S24-150 Load Regulation
(±RS Pins Open)
(+RS to +Vo, -RS to -Vo)
0.20%
0.19%
0.18%
0.17%
0.16%
0.15%
0.14%
0.13%
0.12%
0.11%
0.10%
0.09%
0.08%
0.07%
0.06%
0.05%
0.04%
0.03%
0.02%
0.01%
0.00%
0.20%
0.19%
0.18%
0.17%
0.16%
0.15%
0.14%
0.13%
0.12%
0.11%
0.10%
0.09%
0.08%
0.07%
0.06%
0.05%
0.04%
0.03%
0.02%
0.01%
0.00%
Vin=10V
Vin=12V
Vin=24V
Vin=36V
Vin=10V
Vin=12V
Vin=24V
Vin=36V
1.56
3.13
4.69
6.25
1.6
3.1
4.7
6.8
Io (A)
Io (A)
Graph 7: LV12S26-150 Line Regulation
Graph 8: LV12S24-150 Line Regulation
(±RS Pins Open)
(+RS to +Vo, -RS to -Vo)
0.26%
0.25%
0.24%
0.23%
0.22%
0.21%
0.20%
0.19%
0.18%
0.17%
0.16%
0.15%
0.14%
0.13%
0.12%
0.11%
0.10%
0.09%
0.08%
0.07%
0.06%
0.05%
0.04%
0.03%
0.02%
0.01%
0.00%
0.20%
0.19%
0.18%
0.17%
0.16%
0.15%
0.14%
0.13%
0.12%
0.11%
0.10%
0.09%
0.08%
0.07%
0.06%
0.05%
0.04%
0.03%
0.02%
0.01%
0.00%
Io=1.563A
Io=3.125A
Io=4.688A
Io=6.25A
Io=1.563A
Io=3.125A
Io=4.688A
Io=6.25A
10
12
24
36
10
12
24
36
V
in (V)
Vin (V)
Note: Voltage measurements taken where the output pins are
soldered into test board.
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TECHNICAL DATASHEET
Rev. D
LV12S24-150
Photo 1: Remote Turn On
Photo 2: Remote Turn On
Vin=24V, Iout = 0.6A
Vin=24V, Iout = 6.25A,
Photo 3: Normal Turn On
Photo 4: Normal Turn On
Vin=24V, Iout = 0.6A
Vin=24V, Iout = 6.25A
Photo 5: Remote Turn Off
Photo 6: Remote Turn Off
Vin=24V, Iout = 0.6A
Vin=24V, Iout = 6.25A
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TECHNICAL DATASHEET
Rev. D
LV12S24-150
Photo 7: Transient Response 50% to 100%
Vin=24V, Iout = 3.125 to 6.25A
Photo 8: Input Reflected Ripple Voltage and Ripple Current
Vin=24V, Iout = 6.25A
Cout=1uF Ceramic + 10uF Tantalum
with a 680uF Aluminum Electrolytic and 12uH series inductor.
Photo 9: Output Voltage Ripple (20 MHz BW)
Vin=24V, Iout=0.6A
Photo 10: Output Voltage Ripple (20 MHz BW)
Vin=24V, Iout=6.25A
Photo 11: Output Voltage Ripple (Spike)
Vin=24V, Iout = 6.25A
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TECHNICAL DATASHEET
Rev. D
LV12S24-150
TEST SETUP:
The LV12S24-150 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
Rcontact
Rtrace
+V
V
Vin
Rload
Rtrace R
R
Rtrace
-Vin
-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
1 µF
Rload
LV12S24-150
10 µF
Ceramic
Tantalum
-Vout
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
SCOPE
Irrc
Irc
PROBE
12 µH
+Vin
-Vin
Low
Impedance
Source
LV12S24-150
6,800 µF 1 µF
electrolytic ceramic
capacitor
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TECHNICAL DATASHEET
Rev. D
LV12S24-150
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
+Vout
Pins Facing Down
LV12S24-150
ON/OFF
-Vin
-V
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TECHNICAL DATASHEET
Rev. D
LV12S24-150
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:
ꢀ(603)778-2300
ꢀ(888)587-9255
ꢀ(603)778-9797
E-mail:
Web:
sales@wallindustries.com
www.wallindustries.com
5 Watson Brook Rd.
Exeter, NH 03833
Address:
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Page 15 of 15
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