AVE300-48S2V5 DC-DC Converter TRN AVE300-48S2V5 DC/DC Converter Technical Reference Note Industry Standard Half Brick: 36~75V Input, 2.5V single Output Features Industry Standard Half Brick: 2.4" X 2.28'' X 0.5'' Options * * * Choice of positive logic or negative logic for CNT function Choice of short pins or long pins Choice of with baseplate or without baseplate Description * * * * * * * * * * * * * * * Delivers up to 60A output current Basic isolation Ultra High efficiency Improved thermal performance: High power density Low output noise 2:1 wide input voltage of 36-75V CNT function Remote sense Trim function: +10%/-20% Input under-voltage lockout Output over-current protection Output over-voltage protection Over-temperature protection RoHS compliant The AVE300-48S2V5 is a new DC-DC converter for optimum efficiency and power density. AVE300-48S2V5 provides up to 60A output current in an industry standard Half Brick, which makes it an ideal choice for small space and high power applications. AVE300-48S2V5 uses an industry standard half brick 61.0mm x 57.9mm x 12.7mm (2.4" x 2.28" x 0.5" with baseplate) and 61.0mm x 57.9mm x 9.5mm (2.4" x 2.28" x 0.375" without baseplate), provides CNT and trim functions. AVE300-48S2V5 can provide 2.5V@60A, single output and output is isolated from input. TEL: (86) 755-86010808 BOM: 31020640 www.emersonnetworkpower.com.cn DATE: 2009-05-13 1/22 REV1.3 AVE300-48S2V5 DC-DC Converter TRN OPTIONS .........................................................................................................................................................1 DESCRIPTION..................................................................................................................................................1 MODULE NUMBERING ...............................................................................................................................4 ELECTRICAL SPECIFICATIONS ..............................................................................................................5 INPUT SPECIFICATIONS ...................................................................................................................................5 ABSOLUTE MAXIMUM RATINGS .....................................................................................................................6 OUTPUT SPECIFICATIONS ...............................................................................................................................7 OUTPUT SPECIFICATIONS (CONT)...................................................................................................................8 OUTPUT SPECIFICATIONS (CONT)...................................................................................................................8 0FEATURE SPECIFICATIONS ............................................................................................................................9 CHARACTERISTIC CURVES ...................................................................................................................10 PERFORMANCE CURVES - STARTUP CHARACTERISTICS ............................................................................... 11 FEATURE DESCRIPTION..........................................................................................................................12 CNT FUNCTION ............................................................................................................................................12 TRIM.............................................................................................................................................................13 MINIMUM LOAD REQUIREMENTS.................................................................................................................14 OUTPUT OVER-CURRENT PROTECTION ........................................................................................................14 OUTPUT CAPACITANCE.................................................................................................................................14 DECOUPLING ................................................................................................................................................14 GROUND LOOPS ...........................................................................................................................................15 OUTPUT OVER-VOLTAGE PROTECTION ........................................................................................................15 OVER-TEMPERATURE PROTECTION..............................................................................................................15 DESIGN CONSIDERATION .......................................................................................................................15 TYPICAL APPLICATION .................................................................................................................................15 FUSING .........................................................................................................................................................16 INPUT REVERSE VOLTAGE PROTECTION.......................................................................................................16 EMC ............................................................................................................................................................16 SAFETY CONSIDERATION..............................................................................................................................17 THERMAL CONSIDERATION ..................................................................................................................18 TECHNOLOGIES ............................................................................................................................................18 BASIC THERMAL MANAGEMENT ..................................................................................................................18 Experiment Setup.....................................................................................................................................19 Convection Without Heatsinks .................................................................................................................19 Heatsink Configuration ...........................................................................................................................19 Heatsink Mounting ..................................................................................................................................20 INSTALLATION ..............................................................................................................................................20 SOLDERING ..................................................................................................................................................20 TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 2/22 AVE300-48S2V5 DC-DC Converter TRN MECHANICAL CHART ............................................................................................................................. 21 ORDERING INFORMATION .................................................................................................................... 22 TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 3/22 AVE300-48S2V5 DC-DC Converter TRN Module Numbering AVE 300 - 48 S 2V5 PB - 4 Pin length: 4---4.8mm 0.5mm 6---3.80mm 0.5mm 8---2.80mm+0.5mm/-0.3mm Default is 5.8 mm 0.5mm CNT logic, P---positive, open frame, by default: negative, open frame, B---negative, baseplated, PB---positive & baseplated Output rated voltage: 2V5---2.5V Output number: S ---single output, D---dual output Input rated voltage Output rated power Series name TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 4/22 AVE300-48S2V5 DC-DC Converter TRN Electrical Specifications Unless otherwise indicated, specifications apply over all operating input voltage and temperature conditions. Standard test condition on a single unit is as following: Ta: 25C +Vin: 48V 2% -Vin: return pin for +Vin CNT: connect to -Vin +Vout: connect to load -Vout: connect to load (return) +Sense: connect to +Vout -Sense: connect to -Vout Trim (Vadj): Open Input Specifications Parameter Symbol Min Typ Max Unit Operating Input Voltage VI 36 48 75 VDC Inrush transient - - - 1 A2s Input Reflected-ripple Current II - 15 25 mAp-p Supply voltage rejection (ac) - 45 60 - dB Note - 5Hz to 20MHz: 12H source impedance, TA = 25C. 120Hz CAUTION: This power module is not internally fused. An input line fuse must always be used. TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 5/22 AVE300-48S2V5 DC-DC Converter TRN Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the IPS. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Parameter Symbol Min Typ Max Unit VI 0 - 80 Vdc VI, trans 0 - 100 Vdc Operating Ambient Temperature Ta -40 - 85 C See Thermal Consideration Operating Board Temperature without baseplate Tc 105 - 120 C Near temperature sensor Rt Operating Board Temperature With baseplate Tc 100 - 115 C Center of baseplate TSTG -55 - 125 C - - - 95 % Continuous Note Input Voltage Transient Storage Temperature Operating Humidity 100ms 1mA for 5 sec, Basic Input-Output Isolation(without baseplate) - 1,500 - - Vdc Basic Input-Baseplate Isolation(with baseplate) - 1,500 - - Vdc 1mA for 5 sec, slew rate of 1,500V/10sec Basic Output-Baseplate Isolation(with baseplate) - 500 - - Vdc 1mA for 5 sec, slew rate of 1,500V/10sec Basic Input-Output Isolation(with baseplate) - 1,500 - - Vdc 1mA for 5 sec, slew rate of 1,500V/10sec Po,max - - 150 Output Power TEL: (86) 755-86010808 slew rate of 1,500V/10sec W www.emersonnetworkpower.com.cn 6/22 AVE300-48S2V5 DC-DC Converter TRN Output Specifications Parameter Symbol - Min - Typ 75 Max 100 Output Ripple& Noise Unit Conditions (Ta:25C, Air velocity: 300LFM, Vin: 48V, mVp-p Vonom, Ionom,10u (f<20M tantalum(ESR100 m Hz) )// 1 ceramic capacitor) mVp-p External Load Capacitance Output Voltage Setpoint Line (Vi,min to Vi,max) - - 100 150 (f<20M Whole range Hz) - 470 2200 10000 F Vo,set 2.47 2.5 2.53 Vdc - - - 5 mv - - - 10 mv -- -- -- 0.02 %Vo/C Io 0 - 60 A Io 66 - 84 A Rating input@ Ionom Load Output Regulation (Io = Io,min to Io,max) Temperature Regulation Whole range (Whole range) Rated Output Current Output Current-limit Inception (Hiccup) Efficiency Efficiency TEL: (86) 755-86010808 - - 89 90 91 92 - - % Ta:25C Air velocity: 300LFM Vin: 48V Load: Ionom; forced air direction: from Vin+ to Vin- % Ta:25C Air velocity: 300LFM Vin: 48V Load: 50% Ionom; forced air direction: from Vin+ to Vin- www.emersonnetworkpower.com.cn 7/22 AVE300-48S2V5 DC-DC Converter TRN Output Specifications (Cont) Parameter Peak Deviation: Settling Time (to Vo,nom): Peak Deviation Dynamic Response (all) Settling Time (to Vo,nom) Peak Deviation Settling Time (to Vo,nom) Symbol Min Typ Max - - 100 150 Unit Note mV 25% Ionom step from 50%Ionom, 0.1A/S - - 200 500 sec - - - 200 mV 50% Ionom step from 50%Ionom, 0.1A/S: - - - - sec - - - 250 mV 10% Ionom to 100%Ionom, 0.1A/S - - - - sec Output Specifications (Cont) Parameter Symbol Min Typ Max Unit Turn-On Time - - - 20 msec Output Voltage Overshoot - - - 5 %Vo Switching Frequency - - 240 - KHz TEL: (86) 755-86010808 Note Io = Ionom; Vo from 10% to 90% Io = Ionom; TA = 25C www.emersonnetworkpower.com.cn 8/22 AVE300-48S2V5 DC-DC Converter TRN 0Feature Specifications Parameter Symbol Min Typ Max Unit Note Logic Low -0.7 - 1.2 Vdc Logic High 3.5 - 12 Vdc Logic Low - - 1.0 mA Logic High - - - A - 80 - 110 %Vo Output Over-voltage Protection (Static) Voclamp 2.9 - 3.4 V Hiccup Output Over-voltage Protection (Dynamic) Voclamp 2.9 3.8 V Hiccup Turn-on Point - 31 34 36 V Turn-off Point - 30 33 35 V Isolation Capacitance - - - - PF Isolation Resistance - 10 - - M Enable pin voltage: Enable pin current: Output Voltage Adjustment Range Under-voltage Lockout - - Vin: 48V, Calculated MTBF - - 2,000,000 - Hours Load: Ionom Board@25C Weight Vibration (Sine wave) - - 103 - g(oz.) With baseplate - - 72 - g(oz.) Without baseplate Vibration level: 3.5mm (2 ~ 9Hz), 10m/s2 (9 ~ 200HZ), 15m/s2 (200 ~ 500HZ) Directions and time: 3 axis (X, Y, Z), 30 minutes each Sweep velocity: 1oct / min Peak acceleration: 300m/s2 Shock (Half-sine wave) Duration time: 6ms Continuous shock 3 times at each of 6 directions ( X, Y, Z) TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 9/22 AVE300-48S2V5 DC-DC Converter TRN Characteristic Curves 95 Efficiency(%) 93 91 89 Vin=48V Vin=36V 87 Vin=75V 85 0 10 20 30 40 50 60 IO (A) Fig.1 AVE300-48S2V5-4 Typical Efficiency Ta:25C, Air velocity : 300LFM, Vin: 48V, Load: Ionom; forced air direction: from Vin+ to Vin-. Fig.2 AVE300-48S2V5-4 Typical Output Ripple Voltage o Ta:25 C, Air velocity: 300LFM, Vin: 48V, Vonom, Ionom,10 tantalum(ESR100 m)// 1ceramic capacitor Fig3 AVE300-48S2V5-4 Typical Transient Response to Ta:25, Air velocity: 300LFM, forced air direction: from Vin+ to Vin-. Vin: 48V, Vonom, 25% Ionom step step from 50% Ionom, 0.1A/s ", the external capacitor should be "10 tantalum(ESR100 m) // 1 ceramic capacitor. TEL: (86) 755-86010808 Fig4 AVE300-48S2V5-4.Typical Transient Response to Ta:25, Air velocity: 300LFM, forced air direction: from Vin+ to Vin-. Vin: 48V, Vonom, 50% Ionom from 75% Ionom, 0.1A/s ", the external capacitor should be "10 tantalum(ESR100 m) // 1 ceramic capacitor. www.emersonnetworkpower.com.cn 10/22 AVE300-48S2V5 DC-DC Converter TRN Performance Curves - Startup Characteristics Fig.5 Typical start-up from power on TEL: (86) 755-86010808 Fig.6 Typical start-up from CNT on www.emersonnetworkpower.com.cn 11/22 AVE300-48S2V5 DC-DC Converter TRN effective output voltage regulation point from the output terminals of the unit to the point of Feature Description connection of the remote sense pins. This CNT Function feature automatically adjusts the real output Two CNT logic options are available. The CNT compensate for voltage drops in distribution logic, CNT voltage and the module working and maintain a regulated voltage at the point of state are as the following table. load. voltage L H OPEN N ON OFF OFF P OFF ON ON of AVE300-48S2V5 in order to When the converter is supporting loads far away, or is used with undersized cabling, significant voltage drop can occur at the load. The best defense against such drops is to locate the load close to the converter and to N--- means "Negative Logic" ensure adequately sized cabling is used. When P--- means "Positive Logic" this L--- means "Low Voltage", -0.7VL1.2V is not possible, the converter can compensate for a drop of up to 10%Vo, through H--- means "High Voltage", 3.5VH12V use of the sense leads. ON--- means "Module is on", OFF--- means When used, the + Sense and - Sense leads "Module is off" should be connected from the converter to the point of load as shown in Figure 8, using Open--- means "CNT pin is left open " Note: when CNT is left open, VCNT may reach 6V. twisted pair wire, or parallel pattern to reduce noise effect. The converter will then regulate its output voltage at the point where the leads are Figure 7 shows a few simple CNT circuits. connected. Care should be taken not to reverse the sense leads. If reversed, the converter will trigger OVP protection and turn off. When not used, the +Sense lead must be connected with +Vo, and -Sense with -Vo. Although the output voltage can be increased by both the remote sense and trim, the maximum increase for the output voltage is not Fig.7 CNT circuits the sum of both. Remote Sense AVE300-48S2V5 converter can remotely sense both lines of its output which moves the TEL: (86) 755-86010808 The maximum increase is the larger of either the remote sense or the trim. www.emersonnetworkpower.com.cn 12/22 AVE300-48S2V5 DC-DC Converter TRN Note that at elevated output voltages the maximum power rating of the module remains the same, and the output current capability will decrease correspondingly. The following equation determines the required external-resistor value to obtain a percentage output voltage change of %. Note: y is the adjusting percentage of the voltage. 0<y<10. Radj-up is in k. Trim down Figure 8 Sense connection With an external resistor between the TRIM Trim and -SENSE pins, the output voltage set point The +Vo output voltage of AVE300-48S2V5 decreases (see Figure 10). can be trimmed using the trim pin provided. Applying a resistor to the trim pin through a voltage divider from the output will cause the +Vo output to increase by up to 10% or decrease by up to 20%. Trimming up by more than 10% of the nominal output may activate the OVP circuit or damage the converter. Trimming down more than 20% can cause the converter to regulate improperly. If the trim pin Figure 10 Trim down circuit The following equation determines the required external-resistor value to obtain a percentage output voltage change of %. is not needed, it should be left open. Trim up Note: y is the adjusting percentage of the With an external resistor connected between the TRIM and +SENSE pins, the output voltage set point increases (see Figure 9). voltage. 0<y<10. Radj-up is in k. Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sense or the trim. Figure 9 Trim up circuit TEL: (86) 755-86010808 Note that at elevated output voltages the maximum power rating of the module remains the same, and the output current capability will decrease correspondingly. www.emersonnetworkpower.com.cn 13/22 AVE300-48S2V5 DC-DC Converter TRN capacitor C1 across the output as shown in Minimum Load Requirements Figure 11. The recommended value for the There is no minimum load requirement for the output capacitor C1 is 2200F. AVE300-48S2V5 module. Parameter Device Symbol Typ Unit Minimum Load 2.5V IMIN 0 A Figure 11 Output ripple filter Extra care should be taken when long leads or Output Over-current Protection AVE300-48S2V5 DC/DC converter feature foldback current limiting as part of their Over-current Protection (OCP) circuits. When output current exceeds 110 to 140% of rated current, such as during a short circuit condition, traces are used to provide power to the load. Long lead lengths increase the chance for noise to appear on the lines. Under these conditions C2 can be added across the load, with a 1F ceramic capacitor C2 in parallel generally as shown in Figure 12. the module will work on intermittent mode, also can tolerate short circuit conditions indefinitely. When the over-current condition is removed, Figure 12 Output ripple filter for a distant load the converter will automatically restart. Decoupling Output Capacitance High output current transient rate of change (high di/dt) loads may require high values of output capacitance to supply the instantaneous energy requirement to the load. To minimize the output voltage transient drop during this transient, low Equivalent Series Resistance (ESR) capacitors may be required, since a high ESR will produce a correspondingly higher voltage drop during the current transient. The converter does not always create noise on the power distribution system. High-speed analog or digital loads with dynamic power demands can cause noise to cross the power inductor back onto the input lines. Noise can be reduced by decoupling the load. In most cases, connecting a 10F ceramic capacitor in parallel with a 0.1F ceramic capacitor across the load will decouple it. The capacitors should be connected as close to the load as possible. When the load is sensitive to ripple and noise, an output filter can be added to minimize the effects. A simple output filter to reduce output ripple and noise can be made by connecting a TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 14/22 AVE300-48S2V5 DC-DC Converter TRN Ground Loops Over-Temperature Protection Ground loops occur when different circuits are These modules feature an over-temperature given multiple paths to common or earth protection circuit to safeguard against thermal ground, as shown in Figure 13. Multiple ground damage. The module will work in intermittent points can slightly different potential and cause mode when the maximum device reference current flow through the circuit from one point temperature to another. This can result in additional noise in over-temperature condition is removed, the all the circuits. To eliminate the problem, converter will automatically restart. is exceeded. When the circuits should be designed with a single ground connection as shown in Figure 14. Design Consideration Typical Application Figure 13 Ground loops Fig 15 Typical application F1: Fuse*: Use external fuse (fast blow type) for each unit. For 1.5V output: 5A (Pout=90W) Figure 14 Single point ground Output Over-Voltage Protection The output over-voltage protection consists of circuitry that monitors the voltage on the output terminals. If the voltage on the output terminals exceeds the over voltage protection threshold, then the module will work on hiccup mode. When the over-voltage condition is removed, the converter will automatically restart. C1: Recommended input capacitor C1 100F/100V electrolytic or ceramic type capacitor. C2: Recommended -5C ~ 100C uses: 2,200F/10V (electrolytic capacitor) -40C ~ -5C: For this temperature range, use 2,200F/50V electrolytic capacitor and 220F/10V tantalum capacitor. C3: Recommended 1F/10V The protection mechanism is such that the unit can continue in this condition until the fault is cleared. TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 15/22 AVE300-48S2V5 DC-DC Converter TRN Fusing Input Reverse Voltage Protection The AVE300-48S2V5 power module has no Under installation and cabling conditions where internal fuse. An external fuse must always be reverse polarity across the input may occur, employed! safety reverse polarity protection is recommended. requirements, a 250 Volt rated fuse should be Protection can easily be provided as shown in used. If one of the input lines is connected to Figure 16. In both cases the diode used is chassis ground, then the fuse must be placed rated for 15A/100V. Placing the diode across in the other input line. the inputs rather than in-line with the input Standard safety agency regulations require offers an advantage in that the diode only input fusing. Recommended fuse ratings for the conducts in a reverse polarity condition, which AVE300-48S2V5 are shown as following list. increases To meet international For 1.5V output : 5A (Pout=90W) circuit efficiency and thermal performance. Note: the fuse is fast blow type. Figure 16 Reverse polarity protection circuit EMC For conditions where EMI is a concern, a different input filter can be used. Figure 10 shows a filter designed to reduce EMI effects. AVE300-48S2V5 can meet EN55022 CLASS A with Figure 17. Figure 17 EMI reduction filter Recommended values: TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 16/22 AVE300-48S2V5 DC-DC Converter TRN Component Value / Rating Type Cin1 100F Aluminum Electrolytic CX1 4.7F Metal film or ceramic high frequency capacitor L1 4mH Mn-Zn Common mode Core 20 CY1, CY2 0.22u /275V Safety Y capacitor CY3, CY4 0.047F Safety Y capacitor CY5, CY6 0.047F Safety Y capacitor CY5A, CY6A 0.47F Safety Y capacitor CY7, CY8 33nF Safety Y capacitor Cout1 2200F/16V Aluminum Electrolytic Cout2 1F/63V Metal film capacitor Cout3 1F/50V/SC1206 Chip Capacitor Coi 0.022F Safety Y capacitor CX2 If connected to a 60Vdc power system, double Safety Consideration or reinforced insulation must be provided in the For safety-agency approval of the system in power supply that isolates the input from any which the power module is used, the power hazardous voltages, including the ac mains. module must be installed in compliance with the One input pin and one output pin are to be spacing and separation requirements of the grounded or both the input and output pins are end-use safety agency standard, i.e., UL60950, to be kept floating. CSA C22.2, and EN60950. AVE300-48S2V5 power supply must be performed in combination input-to-output isolation is a basic insulation. with the DC/DC power module to demonstrate The DC/DC power module should be installed in that the output meets the requirement for SELV. end-use equipment, in compliance with the The input pins of the module are not operator requirements of the ultimate application, and is accessible. intended Note: Do not ground either of the input pins of the module, without grounding one of the output pins. This may allow a non-SELV voltage to appear between the output pin and ground. The circuit cannot withstand transient over-voltage. to be supplied by an isolated secondary circuit. When the supply to the DC/DC power module meets all the requirements for SELV (<60Vdc), the output is considered to remain within SELV limits (level 3). TEL: (86) 755-86010808 Single fault testing in the www.emersonnetworkpower.com.cn 17/22 AVE300-48S2V5 DC-DC Converter TRN Thermal Consideration Technologies AVE300-48S2V5modules have ultra high efficiency at full load. With less heat dissipation and temperature-resistant components such as ceramic capacitors, these modules exhibit good behavior during pro-longed exposure to high temperatures. Maintaining the operating board Figure 19 Temperature measurement location(without baseplate) temperature within the specified range help The module should work under 85C ambient for keep internal component temperatures within the reliability of operation and the board their specifications which in turn help keep temperature must not exceed 105C(without MTBF from falling below the specified rating. baseplate) or 100C(with baseplate) while Proper cooling of the power modules is also operating in the final system configuration. The necessary for reliable and consistent operation. measurement can be made with a surface probe after Basic Thermal Management the module has reached thermal equilibrium. No heatsink is mounted, make the Measuring the board temperature of the module measurement as close as possible to the is shown in Figure 18 (with baseplate) and indicated position. It makes the assumption that Figure 19(without baseplate) can verify the the final system configuration exists and can be proper cooling. used for a test environment. Note that the board temperature of module must always be checked in the final system configuration to verify proper operational due to the variation in test conditions. Thermal management acts to transfer the heat dissipated by the module to the surrounding environment. The amount of power dissipated by the module as heat (PD) is got by the equation: PD = PI-PO Where PI is input power; PO is output power; Figure 18 Temperature measurement location(with baseplate) PD is dissipated power. Also, module efficiency () is defined as the following equation: = PO / PI TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 18/22 AVE300-48S2V5 DC-DC Converter TRN If eliminating the input power term, from two above equations can yield the equation below: PD = PO (1-) / test, the airflow was created with externally adjustable fans. The appropriate airflow for a given operating condition can be determined through this figure. The module power dissipation then can be 0m/s calculated through the equation. 1m/s 2m/s a different power dissipation curve, a plot of power dissipation versus output current over three different line voltages is given in the Output Current Io (A) 70 Because each power module output voltage has 60 50 40 30 20 10 0 following figures. 0 10 20 30 40 50 60 70 80 90 Temperature, Ta () Module Derating Figure 21 Forced convection power derating without baseplate Experiment Setup Airflow direction from Vin(+) to Vin(-): Vin=48V; 0m/s 0.5m/s 1m/s 70 Output Current Io (A) From the experimental set up shown in Figure 20, the derating curves as Figure 22 can be drawn. Note that the Printed Wiring Board (PWB) and the module must be mounted vertically. The Passage has a rectangular cross-section. The clearance between the facing PWB and the top of the module is kept 13 mm (0.5 in.) constantly. 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 Temperature, Ta () Figure 22 Forced convection power derating with baseplate Airflow direction from Vin(+) to Vin(-): Vin=48V Heatsink Configuration Several standard heatsinks available for the AVE300-48S2V5 are shown in Figure 23 to 25. Figure 20 Experiment setup Convection Without Heatsinks Increasing the airflow over the module can enhance heat transfer. Figure 21 and figure 22 shows the change of the module output current with the change of ambient temperature. In the TEL: (86) 755-86010808 The heatsinks mounted to the top surface of the module with screws torqued to 0.56 N-m (5 in.-Ib). A thermally conductive dry pad or thermal grease is placed between the case and the heatsink to minimize contact resistance (typically 0.1C/W to 0.3C /W) and temperature differential. www.emersonnetworkpower.com.cn 19/22 AVE300-48S2V5 DC-DC Converter TRN Nomenclature for heatsink configurations is: WDxyyy40 thermal pads) can result in a case-heatsink thermal impedance around 0.1oC/W. x = fin orientation: longitudinal (L) or transverse (T) yyy = heatsink height (in 100ths of inch) For example, WDT5040 is a heatsink that is transverse mounted for a 61mm x 57.9mm (2.4in x 2.28in) module with a heatsink height of 0.5 in. Figure 26 Heatsink mounting Installation Although AVE300-48S2V5 converters can be mounted in any orientation, free air-flowing must be taken. Normally power components are Figure 23 Non-standard heatsink always put at the end of the airflow path or have separate airflow paths. This can keep other system equipment cooler and increase component life spans. Figure 24 Soldering Longitudinal fins heatsink AVE300-48S2V5 converter is compatible with standard wave soldering techniques. When wave soldering, the converter pins should be preheated for 20-30 seconds at 110oC, and wave soldered at 260oC (less than 10 seconds). Figure 25 Transverse fins heatsink When hand soldering, the iron temperature Heatsink Mounting should be maintained at 425oC and applied to A crucial part of the thermal design strategy is the thermal interface between the baseplate of the module and the heatsink. Inadequate measures taken will quickly negate any other attempts to control the baseplate temperature. For example, using a conventional dry insulator can result in a case-heatsink thermal impedance of >0.5oC/W, while use one of the recommended interface methods (using silicon grease or the converter pins for less than 5 seconds. Longer exposure can cause internal damage to the converter. Cleaning can be performed with cleaning solvent IPA or with water. Assembly The maximum length of the screw driven into the heat-sink is 3.3mm. TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 20/22 AVE300-48S2V5 DC-DC Converter TRN Mechanical Chart With no base plate: With base plate: TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 21/22 AVE300-48S2V5 DC-DC Converter TRN Ordering Information Input Voltage (V) Output Voltage (V) Output Current (A) Ripple &Noise (mV pp, Max.) Efficiency (%) Typ. AVE300-48S2V5-4 36-75 2.5 60 150 91 AVE300-48S2V5B-4 36-75 2.5 60 150 91 Model Number TEL: (86) 755-86010808 www.emersonnetworkpower.com.cn 22/22 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Emerson Network Power: AVE300-48S2V5B-4 AVE300-48S2V5-4 AVE300-48S2V5PB-4 AVE300-48S3V3B-6 AVE300-48S3V3B-4 AVE30048S2V5P-4