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TECHNICAL DATASHEET Rev. D
LV12S12-150
Low Voltage DC-DC Converter 10-36 Vdc Input 12Vdc Output at 12.5A Half-Brick Package
Features:
* * * * * * * *
Up to 90% Efficient Cost Efficient Solution Delivering 12.5A at Room Temperature with No Added Heat Sink at 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 Soft Start
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
* * * * * *
Description: The LV12S12-150 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 LV12S12-150 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, soft start, and many other features that are required for today's demanding applications.
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Rev. D
TECHNICAL DATASHEET
LV12S12-150
Technical Specifications
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 90 EFFICIENCY OUTPUT (Vo) 11.88 12.12 Voltage Set Point RS shorted to Vo 12.0 -1% +1% 10.8 13.5 Voltage Adjustment Max Output limited to 150W 12.0 -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 12.12 Remote Sense Compensation Max Output limited to 150W 10% Ripple 1uF Ceramic &10uF Tantalum 120 Spikes 1uF Ceramic &10uF Tantalum Current 0 12.5 Power Limited-Dependent upon SENSE Current Limit 15 compensation and TRIM adjustment Over Voltage Limit Output Clamped 1uF Ceramic & 10uF Tantalum DYNAMIC RESPONSE 50% to 100% Io, di/dt=1A/uS 300 Load step / V Recovery Time Recovery to within 1% Nominal Vo 4 Turn On Delay From Vin(min) to Vout (nom) 14 Turn On Overshoot Full Load Resistive 0 Hold Up Time From Vin (min) to VUVLO_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 100 Turn On (OTP) Case Temperature Less than 95 Calculated Using Bellcore TR-332 Method 1 case 3 2,563,116 MTBF MECHANICAL See Figure 1
Model No. LV12S12-150
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 o
C C o C hours
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Rev. D
TECHNICAL DATASHEET
LV12S12-150
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
Function Negative Output Negative Remote Sense Output Voltage Trim Positive Remote Sense Positive Output Negative Input Chassis Ground (Case) To Key Converter
Comments
If not used, leave open or short to -Vo Refer to page 6 If not used, leave open or short to +Vo Short to -Vin if no chassis ground is available 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 10
ON/OFF +Vin
Remote On/Off 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 O.125 THRU-HOLE ADD: "TH" SUFFIX TO MODEL PART NUMBER. EXAMPLE: LV12S15-100TH 5. CONSULT FACTORY FOR OPTIONAL HEAT SINK.
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Rev. D
TECHNICAL DATASHEET
LV12S12-150
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 F
electrolytic capacitor
1 F
ceramic capacitor
LV12S12-150
-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 8). 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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Rev. D
TECHNICAL DATASHEET
LV12S12-150
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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Rev. D
TECHNICAL DATASHEET
LV12S12-150
Output Voltage Trim: (5V, 12V, 15V, and 20V Models) The output is adjustable +/-10% of rated output voltage. To trim the output voltage down, place the trim resistor between the Trim and -Rs pins (Figure 5). To trim the output voltage up, 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).
Vonom U 1 - R1 Vo - R lim RTH = Vo - Vonom Vo - Vonom R1 Vo RTL = R1 Vo - R lim Vonom - Vo
(in Kohms)
(in Kohms)
Figure 4: Trim Up +Vout +Rs RTH Pins Facing Down
Trim
Figure 5: Trim Down +Vout +Rs
Rload
Pins Facing Down
Trim
Rload
RTL
-Rs -Vout
-Rs -Vout
Table 2: Trim Equations for LV Series (5V, 12V, 15V, and 20V Models)
Vonom 12.000 Percent Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% (888) 597-WALL U1 2.500 Trim Low Vo RTL 11.880 500.78 11.760 245.28 11.640 160.11 11.520 117.53 11.400 91.98 11.280 74.95 11.160 62.78 11.040 53.66 10.920 46.56 10.800 40.88 R1 5.11 Rlim RTH to +Rs 5.11 RTL to -Rs
Trim High Vo RTH 12.120 1956.11 All in Kohms 12.240 985.21 12.360 661.57 12.480 499.76 12.600 402.67 12.720 337.94 12.840 291.71 12.960 257.03 13.080 230.06 13.200 208.49
Note that while decreasing the output voltage, the maximum output current still remains at 12.5A, and while increasing the output voltage, the output current is reduced to maintain a total output power at 150 W.
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Rev. D
TECHNICAL DATASHEET
LV12S12-150
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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Rev. D
TECHNICAL DATASHEET
LV12S12-150
Graph 1: LV12S12-150 Efficiency vs. Output Current
92% 90% 88% 86% 84% 82% 80% 78% 76% 74% 72% 70% 68% 66% 64% 62% 60% 58% 56% 54% 52% 50% 0 1 2 3 4 5 6 Io (A) 7 8 9
Effiency (%)
Vin=10V Vin=12V Vin=24V Vin=36V
10
11
12
13
Graph 2: LV12S12-150 Max Ambient vs. Io
13 12 11 10 9 8
Io (A)
7 6 5 4 3 2 1 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 No Airflow - 12Vin No Airflow - 24Vin 400 LFM - 12Vin 400 LFM - 24Vin
Ambient (C)
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Rev. D
TECHNICAL DATASHEET
LV12S12-150
Graph 3: LV12S12-150 Input Current vs. Input Voltage
20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 9 Io=0A Io=1A Io=2.5A Io=5A Io=7.5A Io=10A Io=12.5A
Graph 4: LV12S12-150 Power Dissipation vs. Input Voltage
30 28 26 24 22 20 Pdissipation (W) 18 16 14 12 10 8 6 4 2 Io=1A Io=5A Io=10A Io=0A Io=2.5A Io=7.5A Io=12.5A
Iin (A)
11 13 15 17 19 21 23 25 27 29 31 33 35 37 Vin(V)
9
11 13 15 17 19 21 23 25 27 29 31 33 35 37 V in(V)
Graph 5: LV12S12-150 Min Load Input Current and Power Dissipation vs. Input Voltage
0.600 Input Current 0.550 Power Dissipation 11.0 12.0
Graph 6: LV12S12-150 "Remote Off" Input Current and Power Dissipation vs. Input Voltage
0.028 0.026 0.024 Input Current Power Dissipation 1.000 0.900 0.800 0.700 0.600 0.500 0.400 0.300 0.200 0.100 0.000 10 12 24
Vin(V) Pdissipation (W)
0.500
10.0
Pdissipation (W)
0.022 0.020
Iin (A)
0.450
Iin (A)
9.0
0.018 0.016 0.014 0.012
0.400
8.0
0.350
7.0
0.300
6.0
0.010 0.008 30 36
0.250 10 12
Vin(V)
5.0 24 36
Note: Voltage measurements taken where the output pins are soldered into test board. (888) 597-WALL www.wallindustries.com Page 9 of 15
Rev. D
TECHNICAL DATASHEET
LV12S12-150
Graph 7: LV12S12-150 Load Regulation (RS Pins Open)
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 1 2 3 4 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%
Graph 8: LV12S12-150 Load Regulation (+RS to +Vo, -RS to -Vo)
Vin=10V Vin=12V Vin=24V Vin=36V
Vin=10V Vin=12V Vin=24V Vin=36V
Regulation (%)
Regulation (%)
5
6
7
8
9
10 11 12 13
0
1
2
3
4
5
Io (A)
678 Io (A)
9
10 11 12 13
Graph 9: LV12S12-150 Line Regulation (+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% 10 Io=1A Io=2.5A Io=5A Io=7.5A Io=10A Io=12.5A
Graph 10: LV12S12-150 Line Regulation (RS Pins Open)
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% 10 Io=1A Io=2.5A Io=5A Io=7.5A Io=10A Io=12.5A
Regulation (%)
Regulation (%)
12
Vin (V)
24
36
12
Vin (V)
24
36
Note: Voltage measurements taken where the output pins are soldered into test board. (888) 597-WALL www.wallindustries.com Page 10 of 15
Rev. D
TECHNICAL DATASHEET
LV12S12-150
Photo 1: Remote Turn On Vin=24V, Iout = 1.25A
Photo 2: Remote Turn On Vin=24V, Iout = 12.5A,
Photo 3: Normal Turn On Vin=24V, Iout = 1.25A
Photo 4: Normal Turn On Vin=24V, Iout = 12.5A
Photo 5: Remote Turn Off Vin=24V, Iout = 1.25A (888) 597-WALL www.wallindustries.com
Photo 6: Remote Turn Off Vin=24V, Iout = 12.5A Page 11 of 15
Rev. D
TECHNICAL DATASHEET
LV12S12-150
Photo 7: Transient Response 50% to 100% Vin=24V, Iout = 6.25 to 12.5A
Cout=1uF Ceramic + 10uF Tantalum
Photo 8: Transient Response Min Load to Max Load Vin=24V, Iout = 1.25 to 12.5A
Cout=1uF Ceramic + 10uF Tantalum
Photo 9: Output Voltage Ripple (20 MHz BW) Vin=24V, Iout=1.25A
Cout=1uF Ceramic + 10uF Tantalum
Photo 10: Output Voltage Ripple (20 MHz BW) Vin=24V, Iout=12.5A
Cout=1uF Ceramic + 10uF Tantalum
Photo 11: Output Voltage Ripple (Spike) Vin=24V, Iout = 12.5A Cout=1uF Ceramic + 10uF Tantalum (888) 597-WALL
Photo 12: Input Reflected Ripple Voltage and Ripple Current Vin=24V, Iout = 12.5A with a 680uF Aluminum Electrolytic and 12uH series inductor. www.wallindustries.com Page 12 of 15
Rev. D
TECHNICAL DATASHEET
LV12S12-150
TEST SETUP: The LV12S12-150 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 Rtrace
Vin Rtrace Rcontact -Vin
Vout Rcontact -Vout
Rload
Rtrace
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
10 F 1 F
Ceramic
LV12S12-150
-Vout
Rload
Tantalum
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 Irc SCOPE PROBE
12 H +Vin
Low Impedance Source
6,800 F
electrolytic capacitor
1 F
ceramic capacitor
LV12S12-150
-Vin
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Rev. D
TECHNICAL DATASHEET
LV12S12-150
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
+Vout
LV12S12-150
-Vout
-Vin
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Page 14 of 15
Rev. D
TECHNICAL DATASHEET
LV12S12-150
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: (603)778-2300 (888)587-9255 (603)778-9797 sales@wallindustries.com www.wallindustries.com 5 Watson Brook Rd. Exeter, NH 03833
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