TECHNICAL DATASHEET
Rev. C
LV12S28-150
Low Voltage DC-DC Converter
10-36 Vdc Input
28Vdc Output at 5.36A
Half-Brick Package
Features:
•
•
•
•
•
•
•
•
Up to 86% Efficient
Cost Efficient Solution
Delivering 5.36A 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
Remote Sense Compensation to 10% Vout
Fast Transient Response
100% Burn In
Applications:
•
•
•
•
•
For use in 12V and 24V battery applications.
For use in Intermediate and Distributed Bus
Architectures (IBA)
Telecommunication equipment
Network (LANs/WANs) Equipment
Next generation low voltage, high current
microprocessors and Ics
•
•
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Description:
The LV12S28-150 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 LV12S28-150 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 DATASHEET
LV12S28-150
Technical Specifications
All specifications are based on 25
o
C, 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 (V
in
)
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 (V
o
)
27.72
28.28
Voltage Set Point
±RS shorted to ±Vo
28.0
-1%
+1%
25.2
30.8
Voltage Adjustment
Max Output limited to 150W
28.0
-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
-
300
-
Spikes
1uF Ceramic &10uF Tantalum
-
-
Current
0.6
-
5.36
Power Limited-Dependent upon SENSE
Current Limit
-
9
-
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 V
ULVO_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
-
-
I
ON/OFF
Sink to pull low – Active Low or High
V
ON/OFF
=0V, Vin=36V
-
-
0.38
I
ON/OFF
Source to drive high – Active High
V
ON/OFF
=5V, Vin=36V
-
-
0.03
I
ON/OFF
Source to drive high – Active Low
V
ON/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
Model No. LV12S28-150
Unit
kHz
Vdc
Vdc
Vdc
A
A
A
mA
%
Vdc
%
Vdc
%
%
% /
o
C
Vdc
%
mV
pk-pk
mV
pk-pk
A
A
Vdc
mV
ms
ms
%
mS
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mA
mA
mA
ms
uS
Vdc
Vdc
Vdc
o
o
C
C
o
C
hours
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Page 2 of 15
Rev. C
TECHNICAL DATASHEET
LV12S28-150
Table 1: Pin Assignments
Pin #
1
2
3
4
5
6
7
8
9
10
Pin Name
-Vo
-RS
Trim
+RS
+Vo
-Vin
CHGND
Key Pin/NC
ON/OFF
+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
Positive Input
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
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
Rev. C
TECHNICAL DATASHEET
LV12S28-150
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
+V
in
Low
Impedance
Source
680
µF
electrolytic
capacitor
1
µF
ceramic
capacitor
LV12S28-150
-V
in
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.
(888) 597-WALL
www.wallindustries.com
Page 4 of 15
Rev. C
TECHNICAL DATASHEET
LV12S28-150
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
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