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TECHNICAL DATASHEET Rev. B
MPQ24S5-50
50 W DC-DC Converter 10-36 Vdc Input 5 Vdc Output at 10 A Quarter-Brick Package
Features: * Over 87% Efficient at Full Load * Fast Transient Response * Operation to No Load * Output Trim +/-10% * Remote ON/OFF * Remote Sense Compensation * Low Output Ripple
* * * * * * *
Fixed Switching Frequency Output Over Current Protection Output Short Circuit Protection Over Temperature Protection 1000 V Isolation 100% Burn In Heatsink Available
Description: The MPQ24 series is a high density, low voltage input quarter brick converter that incorporates the desired features required in today's demanding applications while maintaining low cost. When performance, reliability, and low cost are needed, the MPQ series delivers.
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Technical Specifications
Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
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. Related condition Min Nom Max SPECIFICATION Switching Frequency 200 INPUT (Vin) Operating Voltage Range UVLO Turn On at UVLO Turn Off at UVLO Hysterisis Maximum Input Current (Graph 3) No Load Input Current (Graph 5) Input Current under "Remote Off" (Graph 6) Reflected Ripple Current (Photos 1 & 2) Input Surge Voltage EFFICIENCY (Graph 1) OUTPUT (Vo) Voltage Set Point Voltage Adjustment (Table 2) Load Regulation (Graph 7) Line Regulation (Graph 8) Temperature Drift (Graph 9) Remote Sense Compensation Ripple (Photos 7, 9 & 11) Spikes (Photos 7, 9 & 11) Current Current Limit Over Voltage Limit DYNAMIC RESPONSE Load step / V (Photos 8, 10 & 12) Recovery Time (Photos 8, 10 & 12) Turn On Delay (Photo 3) Turn On Overshoot (Photos 3 & 5) Hold Up Time (Photo 4) REMOTE ON/OFF Remote ON - Active High Remote OFF - Active High Remote ON/OFF pin Floating - Active High ION/OFF Sink to pull low - Active High Remote ON - Active Low Remote OFF - Active Low Remote ON/OFF pin Floating - Active Low ION/OFF Sink to pull low - Active Low ION/OFF Source to drive high - Active High or Low Turn On Delay - (Photo 5) Turn Off Delay - (Photo 6) ISOLATION Input-Output Input/Output-Chassis Isolation Resistance Isolation Capacitance THERMAL Ambient (Graph 2) Over Temperature Protection Storage Temperature MTBF MECHANICAL Weight Sense shorted to Vout Max Output limited to 90W Sense shorted to Vout Sense shorted to Vout Max Output limited to 50W (as measured at the converter output pins) With 1 uF ceramic & 10 uF Tantalum With 1 uF ceramic & 10 uF Tantalum Power Limited-Dependent upon SENSE compensation and TRIM adjustment 10 9.8 9.4 4.970 -0.60 4.50 -10% 0 12 5.8 24 10.0 9.7 0.3 5.8 0.081 3.1 192 87 5.000 5.00 0.02 0.02 0.013 82 82 14 54.0 36 10.3 9.9 50 5.030 +0.60 5.50 +10% 0.1 0.1 0.025 5.50 10% 100 150 10.0 16 58
Model No. MPQ24S5-50
Unit kHz Vdc Vdc Vdc Vdc A A mA mA Vdc % Vdc % Vdc % % % / oC Vdc % mVpk-pk mVpk-pk A A Vdc mV ms ms % mS Vdc Vdc Vdc mA Vdc Vdc mA mA ms uS Vdc Vdc
G
Low Line No Load Active High Unit Measured with a 120 uF Alum. Elect. Input Capacitor 100 mS
25% to 100% Io, di/dt=0.025A/uS 264 Recovery to within 1% Nominal Vout 1 From Vin(min) to Vout (mom) 10 Full Load Resistive 0.0 From Vin (min) to VULVO_Turn_Off 0 Active High or Active Low (Add an `R' to the end of the PN ie: MPQ24S5-50R) Min High to Enable 1.5 Max Low to Disable 0.3 Over Operating Voltage Range 1.6 5.2 VON/OFF =0V, Vin=36 V 0.15 Max Low to Enable 0.8 Min High to Disable 2.1 Over Operating Voltage Range 2.3 6.2 VON/OFF =0V, Vin=36V 0.6 0 Enable (max Low) to Vout (min) 3 Enable (0V) to Vout (min) 100 1 minute 1 minute at 25oC Max. Ambient limited by Derating Curves (Graph 2) Case Temperature Calculated Using Bellcore TR-332 Method 1 case 3 1000 1000 20 -40 -55 0.01 -
uF
o o
Graph 2 25 110 125 1,250,300 See Figure 1 61 -
C C o C hours g
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Table 1: Pin Assignments
Pin # 1 2 3 4 5 6 7 8 Pin Name +Vin Enable -Vin +Vout +SENSE TRIM -SENSE -Vout Function Positive Input Remote On/Off Negative Input Negative Output Negative Remote Sense Output Voltage Trim Positive Remote Sense Positive Output
Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
Comments If not used, leave open for standard unit, short to -Vin on `R' units.
If not used, short to -Vo. If not used, leave open. If not used, short to +Vo.
Figure 1: Mechanical Dimensions
.00 [0.0] .00 [0.0] .00 [0.0]
.60 [15.2]
.00 [0.0] 1 2 3 1 2 3
WALL INDUSTRIES
.45 [11.4]
.60 [15.2]
.30 [7.6]
.30 [7.6]
.15 [3.8]
2.28 [57.9]
PIN DESIGNATION PIN O
1 2 3 4 5 6 7 8 + Vin ON/OFF -Vin + Vout + SENSE TRIM -SENSE -Vout O.062 [1.57] O.040 [1.02] O.062 [1.57] O.062 [1.57] O.040 [1.02] O.040 [1.02] O.062 [1.57]
MODEL NAME
XXXX EXETER, NH 03833 XXXX
.11 [2.8] REF
INTERFACE-PLANE
LABEL
INTERFACE-PLANE
O.040 [1.02]
.43 [10.8]
.14 [3.6] .19 [4.7] .00 [0.0]
NOTES:
1. PIN TO PIN TOLERANCE: .010 [ 0.25] MEASURED AT STANDOFF FEATURE ONLY, DATUM-B. 2. PIN DIAMETER TOLERANCE OF : .005 [ 0.13] MEASUREMENT READING APPLIES TO AREA FROM INTERFACE-PLANE SURFACE DATUM-B TO END OF PIN ONLY. 3. UNLESS OTHERWISE SPECIFIED.
1.45 [36.8]
.42 [10.7]
4 5 6 7 8
4 5 6 7 8
.42 [10.7]
A
PIN END
INTERFACE-PLANE
.071 .005 [1.80 0.13] STANDOFF DIMENSION O.040 [1.02] PINS ONLY 4X RECOMMENDED FINISHED RECEIVING PCB STAND-OFF HOLE O.052 .003 [1.32 0.08] PIN-2 SHOWN FOR DIMENSIONS
B
2.00 [50.8]
.20 MIN [5.1 MIN] SEE NOTE-3 PIN LENGTH FROM INTERFACE-PLANE ONLY
UNLESS OTHERWISE SPECIFIED
ALL DIMENSONS ARE IN INCHES [ XX ] ARE IN MILLIMETERS APPLIED TOLERANCES:
ANGLES= 1 .XX= .02[0.5] .XXX= .010[0.25]
DO NOT SCALE DRAWING
INTERPRET DIMENSION AND TOLERANCE PER ASME Y14.5M - 1994
.00 [0.0]
.00 [0.0]
.60 [15.2]
.30 [7.6]
.00 [0.0] .26 [6.5]
.47 [11.9]
1
WALL INDUSTRIES
PIN DESIGNATION PIN O
1 2 3 4 5 6 7 8 + Vin ON/OFF -Vin + Vout + SENSE TRIM -SENSE -Vout O.062 [1.57] O.040 [1.02] O.062 [1.57] O.062 [1.57] O.040 [1.02]
1.030 [26.16]
1 2 3
1.54 [39.1]
.15 [3.8]
.30 [7.6]
2.37 [60.2]
.51 [13.0]
.45 [11.4]
.60 [15.2]
DOT DENOTES PIN-1
.00 [0.0]
THIRD ANGLE PROJECTION
.112(NO:4)-40UNC-2B 4X MAX SCREW DEPTH .100 FROM SURFACE-A 4X MAX APPLIED RECIEVING TORQUE: 6.0 lbf in [ 0.68 N m]
2 3
4 5 6 7 8
4 5 6 7 8
.47 [11.9]
MODEL NAME
XXXX XXXX
LABEL
INTERFACE-PLANE
.41 [10.4]
.60 [15.1]
O.062 [1.57]
SEE NOTE-4
.19 [4.7]
NOTES:
1. PIN TO PIN TOLERANCE: .010 [ 0.25] MEASURED AT STANDOFF FEATURE ONLY, DATUM-B. 2. PIN DIAMETER TOLERANCE OF : .005 [ 0.13] MEASUREMENT READING APPLIES TO AREA FROM INTERFACE-PLANE SURFACE DATUM-C TO END OF PIN ONLY. 3. UNLESS OTHERWISE SPECIFIED. 4. THERMAL TRANSFER PLATE MATERIAL: .040 [1.02] THICK, ALUMINUM ALLOY 3003-0, PER: QQA 250/2 WITH BLACK SOFT SULFURIC ANODIZE FINISH.
.005 .19 [4.7] .00 [0.0]
.26 [6.5]
O.040 [1.02]
-A-
C
PIN END
INTERFACE-PLANE
.071 .005 [1.80 0.13] STANDOFF DIMENSION O.040 [1.02] PINS ONLY 4X RECOMMENDED FINISHED RECEIVING PCB STAND-OFF HOLE O.052 .003 [1.32 0.08] PIN-2 SHOWN FOR DIMENSIONS
B
2.00 [50.8]
.20 MIN [5.1 MIN] SEE NOTE-3 PIN LENGTH FROM INTERFACE-PLANE ONLY
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INTERFACE-PLANE
O.040 [1.02]
1.860 [47.24]
Page 3 of 11
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DESIGN CONSIDERATIONS Under Voltage Lock Out (UVLO)
Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
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. Upon sensing an over current, the output will begin to drop (or `foldback') limiting the output power. Further increasing the output current will cause the converter to shut off and then restart (or `hiccup') until the overcurrent condition is removed. Shorting the output will cause the converter to immediately enter the `hiccup' mode.
Over Temperature Protection
The converter is protected from over temperature conditions. Upon exceeding this temperature, the converter will shut down. The converter will automatically recover once the over tempature condition is removed.
Input Filter
No additional input capacitor is needed for the power supply to operate. However, due to the low voltage, high input current nature of the power supply, it is highly recommended that a minimum 100 uF/50 V electrolytic type input bulk capacitor be added to reduce input ripple voltage and current. Refer to Photos 1 and 2 for an example. For an even further reduction of input ripple, an inductor may be placed between the source and the previously mentioned capacitor. Additionally, a 1-10 uF ceramic capacitor may be added in front of the inductor to form pi-filter. No inductor should be placed between the capacitor and the input to the converter.
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. Usually, a ceramic capacitor between 1 and 100 uF works best for reducing ripple and spike noise. Also, capacitance in the form of a low-esr, surge robust tantalum capacitor (ie: Kemet T495 Series) may also be placed across the output in order reduce ripple, and improve the transient peak-to-peak voltage deviation (see Photos 7 to 11). Due to the low-esr nature of the output of the power supply, adding typical aluminum electrolytic capacitors to the output will not help much in reducing ripple or transient deviations, unless the load is some distance from the power supply output. Then, these capacitors should be placed at the load.
Remote Sense
To improve regulation at the load, route the connections from the -Sense and the +Sense pins to the -Vout and +Vout connections at the load. This will force the converter to regulate the voltage at the load and not at the pins of the converter. If it is not desired to use the Remotes Sense feature, the -Sense and +Sense pins should be shorted to the -Vout and +Vout pins respectively. However, no damage to the converter will occur if the Sense pins are left open.
Fusing
It is required that the input to the converter be supplied with a maximum 10 A, 250 V rated fuse UL Listed or R/C fuse.
Safety
The MPQ24 series is designed to meet EN60950 Safety of Information Technology Equipment. The isolation provided by the MPQ24 series is a Basic insulation in accordance with EN60950. SELV output reliability is maintained only if the input to the converter is a SELV source. To maintain SELV reliability, if either +Vin or -Vin is connected to chassis, either +Vout or -Vout must also be connected to chassis. Otherwise, both the input and the output must not be connected to chassis.
PCB Layout Considerations
Due to the Basic isolation provided by the converter, caution must be observed in routing traces more than 2 mm inward of any input or output pins on the top layer of the pcb board underneath the converter. Also, due to noise coupling and isolation requirements, no power or ground planes or any signal traces should be routed on the top layer of the pcb underneath the converter. Due to comon noise coupling, input or output power and ground planes should not be poured across the input to output on any layers underneath the converter. Instead, it is best to provide separate input and output power and ground traces on the bottom or an inner layer with a miminum of 1 mm separation between traces on the same layer. Lastly, as the case/heatsink is floating metal, caution must also be observed to provide appropriate spacing (minimum 1.4 mm for Pollution degree 2 Material Group IIIa + IIIb) around the case/heatsink or risk reducing the input to output spacing and violating Basic insulation requirements.
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Remote ON/OFF
Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
This converter has the ability to be remotely turned ON or OFF. The series may be ordered Active-High or Active-Low (place an option `R' at the end of the part number). Active-High means that a logic high at the ENABLE pin will turn ON the supply (Figure 2). With Active-High, if the ENABLE pin is left floating, the supply will be enabled. Active-Low means that a logic low at the ENABLE pin will turn ON the supply (Figure 3). With Active-Low, if the ENABLE pin is left floating, the supply will be disabled. If remote On/Off is not used on an Active-Low supply, short the Enable pin to -Vin.
Output Voltage Trim
The output is adjustable from +/-10% of the output voltage. To adjust the output voltage low, place a resistor between the TRIM and SENSE pins (Figure 4). To adjust the output voltage high, place a resistor between the +SENSE and TRIM pins (Figure 5). The value of the TRIM resistor with respect to the desired output voltage can be found in Table 2 or derived from the following equations:
RTrim - Low =
511 - 5.11 (in k) %
5.11 Vonom (% + 100) 511 - - 5.11 (in k) 2.5 % % Vo + / - - Vonom where % = Percent Trim = 100 Vo + / - RTrim - High =
Table 2: Trim Resistor Values (in k) TRIM Low TRIM High Percent Trim Vout RLow Vout RHigh 4.950 500.78 5.050 511.00 1% 4.900 245.28 5.100 255.50 2% 4.850 160.11 5.150 170.33 3% 4.800 117.53 5.200 127.75 4% 4.750 91.98 5.250 102.20 5% 4.700 74.95 5.300 85.17 6% 4.650 62.78 5.350 73.00 7% 4.600 53.66 5.400 63.88 8% 4.550 46.56 5.450 56.78 9% 4.500 40.88 5.500 51.10 10%
Note 2: While decreasing the output voltage, the maximum output current remains the same, and while increasing the output voltage, the output current is reduced to maintain the total output power at 50 W.
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Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
Graph 1: MPQ24S5-50 Efficiency vs. Output Current
92%
90%
88% Effiency (%)
86%
84% Vin=12V Vin=20V Vin=28V Vin=36V
82%
80%
78% 2 3 4 5 6 Io (A) 7 8 9 10
Graph 2: MPQ24S5-50 Max Ambient vs. Io
12.0
10.0
8.0 200LFM 100LFM No Air
Io (A)
6.0
4.0
2.0
0.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Ambient (C)
Note 3: When trimming output high, Io vs. Ambient is derated by power. ie: from Graph 2, find the maximum current at the desired ambient and airflow, and multiply this current by the nominal voltage to get the maximum power. Divide this power by the desired trimmed high voltage to get the maximum current at that ambient. When trimming low, the maximum current stays the same as shown in Graph 2. (888) 597-WALL www.wallindustries.com Page 6 of 11
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Graph 3: MPQ24S5-50 Input Current vs. Input Voltage
5.0 Io=0A Io=2A Io=4A Io=6A Io=8A Io=10A
Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
Graph 4: MPQ24S5-50 Power Dissipation vs. Input Voltage
10 Io=0A Io=2A Io=4A Io=6A Io=8A Io=10A
4.0
8
3.0 Iin (A)
Pdissipation (W)
6
2.0
4
1.0
2
0.0 12 16 20 24 Vin(V) 28 32 36
0 12 16 20 24 Vin(V) 28 32 36
Graph 5: MPQ24S5-50 No Load Input Current and Power Dissipation vs. Input Voltage
0.150 3.0
Graph 6: MPQ24S5-50 "Remote Off" Input Current and Power Dissipation vs. Input Voltage
6.0 Input Current - R Unit Input Current Power Dissipation - R Unit Power Dissipation 300
0.125
2.5
5.0
250
0.100
2.0 Pdissipation (W) Iin (mA)
4.0
200 Pdissipation (mW)
Iin (A)
0.075
1.5
3.0
150
0.050 Input Current Power Dissipation 0.025
1.0
2.0
100
0.5
1.0
50
0.000 12 16 20 24 Vin(V) 28 32 36
0.0
0.0 12 16 20 24 Vin(V) 28 32 36
0
Note 4: Voltage measurements taken where the output pins are soldered into test board.
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Graph 7: MPQ24S5-50 Load Regulation (+SENSE to +Vout, -SENSE to -Vout)
0.05% 0.04% 0.03% 0.02% Regulation (%) 0.01% 0.00% -0.01% -0.02% -0.03% -0.04% -0.05% 0 2 4 Io (A) 6 8 10
Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
Graph 8: MPQ24S5-50 Line Regulation (+SENSE to +Vout, -SENSE to -Vout)
0.05% 0.04% 0.03% 0.02% Regulation (%) 0.01% 0.00% -0.01% -0.02% -0.03% -0.04% -0.05% 12 16 20 24 Vin (V) 28 32 36 Io=0A Io=2A Io=4A Io=6A Io=8A Io=10A
Vin=12V Vin=20V Vin=28V Vin=36V
Graph 9: MPQ24S5-50 Output Temperature Drift (+SENSE to +Vout, -SENSE to -Vout)
1.0% 0.8% 0.5% 0.3%
Vout (%)
0.0% -0.3% -0.5% -0.8% -1.0% -40 -20 0 20 40 60 80 100 Case Temperature (C)
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Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
Photo 1: Input Ripple Voltage and Current Vin=24 V, Iout = 10 A
Photo 2: Input Ripple Voltage and Current Vin=24 V, Iout = 10 A With a 120 uF Aluminum Electrolytic across the Input
Photo 3: Normal Turn On at 24 V
Photo 4: Normal Turn Off at 24 V
Photo 5: Turn On by Enable at 24 V
Photo 6: Turn Off by Enable at 24 V
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Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
Photo 7: Output Ripple and Noise (20 MHz BW) Vin=24 V, Iout = 10 A With a 1 uF Ceramic & a 10 uF Tantalum across the Output
Photo 8: Transient Response - 0.25A/us Vin=24 V, Iout = 2.5 to 7.5 A (25% to 100%) With a 1 uF Ceramic & a 10 uF Tantalum across the Output
Photo 9: Output Ripple and Noise (20 MHz BW) Vin=24 V, Iout = 10 A With a 330 uF Tantalum across the Output
Photo 10: Transient Response - 0.25A/us Vin=24 V, Iout = 2.5 to 7.5 A (25% to 100%) With a 330 uF Tantalum across the Output
Photo 10: Output Ripple and Noise (20 MHz BW) Vin=24 V, Iout = 10 A With a 100 uF Ceramic across the Output (888) 597-WALL
Photo 11: Transient Response - 0.25A/us Vin=24 V, Iout = 2.5 to 7.5 A (25% to 100%) With a 100 uF Ceramic across the Output Page 10 of 11
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Ordering Information:
Rev. B
TECHNICAL DATASHEET
MPQ24S48-50
Part Number Example:
MPQ 24 S 48 - 50 R
Series Designation Nominal Input Voltage Single Output Nominal Output Voltage
Maximum Output Power
Options R C Leave Blank for no Options Active Low Heatsink/Case
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 it's 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: (603)778-2300 Phone: (888)587-9255 Toll Free: (603)778-9797 Fax: sales@wallindustries.com E-mail: www.wallindustries.com Web: 5 Watson Brook Rd. Address: Exeter, NH 03833
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