ASD75EB ASTRODYNE | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 8
Technical content
75 Watt, High Density, Eighth Brick DC/DC Converter ASD75EB series
WWW.ASTRODYNETDI.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 Small 2.32” x 0.9” x 0.37” Size Constant Frequency High Typical Efficiency of 92% (12Vout) Low Output Noise 24 or 48VDC Nominal Input Voltage Options Output Over Voltage Protection Current Limit/Short Circuit Protection Adjustable Output Voltage 80-110% of Vo No Sink Current from Output During Shutdown Logic ON/OFF Control MTBF of 1.3Mhrs RoHS Compliant CSA Certified to IEC 60950-1 for Basic Insulation Model Number Output Voltage Output Amps Input Range Max. Iin FL Efficiency Max Output Power ASD75-24S3.3EB 3.3 VDC 20 18-36 VDC 4.9A 89%, typ. 66 Watts ASD75-24S5EB 5 VDC 15 18-36 VDC 5.5A 90.5%, typ. 75 Watts ASD75-24S12EB 12 VDC 6.25 18-36 VDC 5.5A 91.5%, typ. 75 Watts ASD75-48S3.3EB 3.3 VDC 20 36-75 VDC 2.5A 89%, typ. 66 Watts ASD75-48S5EB 5 VDC 15 36-75 VDC 2.9A 91%, typ. 75 Watts ASD75-48S12EB 12 VDC 6.25 36-75 VDC 2.9A 92%, typ. 75 Watts DESCRIPTION: The ASD75EB Series of products are open frame, high density, dc/dc convert- ers designed for use in distributed power architectures and may, in many cases, be used as fit and function replacements for industry standard quarter brick modules with a 34% space savings. Synchronous Rectification enables these power supplies to produce up to 75W of high efficiency power in an 1/8th brick
WWW.ASTRODYNETDI.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 ABSOLUTE MAXIMUM RATINGS (MIN TO MAX.) Input Voltage (+In to -In) 24Vin: 18-36VDC Continuous 48Vin: 36-75VDC Continuous Transient Input Voltage 24Vin: 50VDC (100mS max.) 48Vin: 100VDC (100mS max.) Operating Temperature -40 to 85°C (See Derate Curve) Storage Temperature (Ambient) 125°C Wave Solder Temperature 260°C for 10 Seconds INPUT SPECIFICATIONS (400LFM AIRFLOW) Input Operation Voltage: See Model Chart on Page 1 Input Current FL (0 Vin - Vin max.) See Model Chart on Page 1 Input Transient 1A²t Input Reflected Ripple Current 20mAp-p, typ. (Note 1) Startup Input Voltage (Note 4) 24Vin: 16-18VDC 48Vin: 33-36VDC Shutoff Input Voltage 24Vin: 14-16VDC 48Vin: 30-33VDC Hysteresis 1V OUTPUT SPECIFICATIONS Output Voltage See Model Chart on Page 1 Output Current (Io, max.) See Model Chart on Page 1 Output Set Point (Vo,set) +/-1.5%, Nominal Vin, FL Total Output Voltage Range +/- 3% Line/Load Regulation +/-1% Temperature Regulation +/-1%, -40 to 70°C Ripple/Noise 150mV p-p max., 30mVrms (Note 2) Dynamic Response: (Note 3) Peak Deviation 4% Vnom Settling Time 200uS Vout within 1% Vnom Over Voltage Protection 110-140% of Output, Hiccup Mode Over Temperature Protection 105-125°C, auto recover (converter hot spot temperature) External Capacitance (Electrolytic) 3.3 & 5Vout: 10 to 5000uF max. 12Vout: 220 to 1200uF max. Short Circuit Protection (rms) 15Arms, Hiccup, Rout ≤10M Ω Current Limit (rms.) 105-140%, Hiccup Mode Efficiency FL See Model Chart on Page 1 ISOLATION SPECIFICATIONS Input-Output 1500VDC Input-Output Capacitance 1500pF Isolation Resistance 10MΩ GENERAL SPECIFICATIONS MTBF 1.3Mhrs Weight 0.72 oz (20.5g) Dimensions 2.3” x 1.45” x 0.47” (58.4 x 36.8 x 12mm) CONTROL SPECIFICATIONS Input Logic Low Voltage at 1mA current relative to -Vin is 1V max. Current at 0 volts is 1mA Input Logic High Enable pin voltage relative to -Vin is 5.5V Leakage current is 100uA Turn-On Time 500mS, FL, o=90% Vo, set Trim Adjustment Range 80-110% See TRIM FUNCTION Fig 4 NOTES 1.Measured before Input Filter, 12uH inductor 2.Scope measurement should be made using a BNC connector with 1uF and 10uF aluminum electrolytic capacitor across output. Scope set to read at 20MHz bandwidth. uS 4. The Cold Start condition is a uniform converter temperature of -40°C after thermal stabilization. An additional 2x220uF is needed for cold startup conditions. The Hot Start condition for start up is a uniform con- verter temperature of 65°C after thermal stabilization. All specifications are typical at nominal input, full load, and 25DegC unless otherwise noted
WWW.ASTRODYNETDI.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 PIN OUTS Figure 1: ASD75EB Series Pin Outs OUTLINE DRAWING Figure 2: Mechanical Outline (PIN 4) PIN 1 BOTTOM VIEW Figure 1: ASD75EB Series Pin Outs Figure 2: Mechanical Outline OUTLINE DRAWING
WWW.ASTRODYNETDI.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 OPERATING INFORMATION Enable Pin The Enable Pin (pin 2) enables the user to control when the converter will turn on or off. This pin is referenced to –Vin (pin 3). There are two versions available for each c onverter, positive logic and negative logic. For positive logic, leaving the Enable pin open or applying TTL/CMOS high voltage level turns the converter on, while pulling this pin to –Vin or drawing more than 1mA turns it off. The negative logic is just the inverse. An external semiconductor switch or mechanical switch can be used to implement this function. Remote Sense The remote sense pins +Sense (pin 7) and –Sense (pin 5) allows the converter to correct for voltage drops across the connections from the converter output pins +/-Vout (pins 8 and 4 respectively) to the intended load. The +/- Sense pins should be connected at the point in the board where regulation is needed. Figure 3 shows the recommended connection. Figure 3: Remote Sense connection The resistive drop across the connections should be small enough since Over Voltage Protection might be triggered during high load applications. The OVP circuit senses the +/-Vout pins. Figure 3: Remote Sense Connection
WWW.ASTRODYNETDI.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 Rtrim-down = (511 //uni0394%) – 10.22 kOhms Rtrim-up = (5.11Vout|100 +/uni0394%| / 1.225/uni0394%) – (511//uni0394%) – 10.22 kohms Where: /uni0394% = [(Vnominal-Vdesired)/V nominal] x 100% Figure 4: TRIM Function There is an upper limit to the trim up since the OVP level is fixed. Trimming the output voltage too high may trigger the OVP circuit during higher load applications or during transients. Current Limit Protection The ASD75EB series modules include over current protection that allows them to withstand prolonged overloads or short circuit conditions on the output without over heating. The ASD75EB series employs hiccup mode protection such that the output shuts down during these conditions, waits for a predetermined time (~500mS), and tries to restart. If the overload condition is still present, the converter will stop trying to increase the output voltage and repeat the cycle. Over Voltage Protection The ASD75EB series modules have output over voltage protection. In the event of an over voltage condition in the output pins, the converter will shut down immediately. Similar to hiccup mode, it will make continuous attempts to start up until the over voltage is gone and resume normal operation automatically Input Under-Voltage Lockout The ASD75EB series is designed to turn off when the input voltage is too low. This is done to avoid stressing the input side circuitry of the primary circuit. The lockout is a comparator with hysteresis, thus avoiding the converter jumping from on-off condition when crossing the UVLO threshold. Trim The Trim pin (pin 6) allows the user to adjust the output voltage across the sense pins from the initial value. Trimming the output voltage requires the user to connect a resistor between Trim and + Vout for output voltage trim up, or connect a resistor between Trim and – Vout for output voltage trim down. The functions for trim up, trim down and the circuit implementation is shown in the figure 4.
WWW.ASTRODYNETDI.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 Over Temperature Protection The ASD75EB series modules are protected from thermal overload by an internal over temperature protection IC. When the PCB temperature sense point reaches 125°C, the converter will shut down immediately. The converter will attempt to restart when the temperature has dropped at least 10°C below the Over Temperature threshold. Thermal Considerations The ASD75EB series are designed to operate in a wide range of thermal environments. However, enough cooling should be provided to ensure reliable performance. Heat is removed from the converter in 3 ways: conduction, convection and radiation. Improved cooling by convection can be done by increasing the airflow through the module. The available load current for a given ambient air temperature is in the de-rating curves section. The test is done using the test fixture shown in figure 5. Figure 5: Thermal Test Fixture Pin3 Pin1 Pin4 Pin8 Proper cooling can be verified by m onitoring the temperature of the critical components of the power stage. Each of the selected critical components was monitored by using thermocouple. The generation of the thermal de-rating curves involves extensive thermal testing at different combinations of input voltage, ambient air temperature, load current and airflow with the given test fixture. However, the final temperature of the module in the final system will depend again on several factors, including host PCB size, number of layers, and copper weight, airflow direction and turbulence, operating ambient temperatures, etc… It is highly recommended to verify the thermal performance of the converter when included in the end system. ASD75 Figure 5: Thermal Text Fixture
WWW.ASTRODYNETDI.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 Thermal Characteristic Test done using Thermal Set-up of Figure 5; Vin = Vinnom ASD75-48S3.3EB Power Derating Curve 20% 40% 60% 80% 100% 120% 25 03 53 04 54 05 55 06 56 07 57 08 58 Temperature (ºC)Temperature (ºC)Temperature (ºC)Temperature (ºC) PowerPowerPowerPower
0 LFM0 LFM0 LFM0 LFM
100 LFM100 LFM100 LFM100 LFM
200 LFM200 LFM200 LFM200 LFM
300 LFM300 LFM300 LFM300 LFM
400 LFM400 LFM400 LFM400 LFM
ASD75-48S5EB Power Derating Curve Temperature (ºC)Temperature (ºC)Temperature (ºC)Temperature (ºC) PowerPowerPowerPower ASD75-48S12EB Power Derating Curve Temperature (ºC)Temperature (ºC)Temperature (ºC)Temperature (ºC) PowerPowerPowerPower ASD75-24S3.3EB Power Derating Curve Temperature (ºC)Temperature (ºC)Temperature (ºC)Temperature (ºC) PowerPowerPowerPower ASD75-24S5EB Power Derating Curve Temperature (ºC)Temperature (ºC)Temperature (ºC)Temperature (ºC) PowerPowerPowerPower ASD75-24S12EB Power Derating Curve Temperature (ºC)Temperature (ºC)Temperature (ºC)Temperature (ºC) PowerPowerPowerPower 20% 40% 60% 80% 100% 120% 25 03 53 04 54 05 55 06 56 07 57 08 58 20% 40% 60% 80% 100% 120% 25 03 53 04 54 05 55 06 56 07 57 08 58 20% 40% 60% 80% 100% 120% 25 03 53 04 54 05 55 06 56 07 57 08 58 20% 40% 60% 80% 100% 120% 25 03 53 04 54 05 55 06 56 07 57 08 58 20% 40% 60% 80% 100% 120% 25 03 53 04 54 05 55 06 56 07 57 08 58 ASD75-48S12EB Power Derating Curve ASD75-24S12EB Power Derating Curve
WWW.ASTRODYNETDI.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 Efficiency Curves Ta=25oC, airflow rate = 400LFM ASD75-48S3.3EB Efficiency Curve 55% 60% 65% 70% 75% 80% 85% 90% 95%59 Output Load Current; Imax = 20 AOutput Load Current; Imax = 20 AOutput Load Current; Imax = 20 AOutput Load Current; Imax = 20 A EfficiencyEfficiencyEfficiencyEfficiency 36Vdc Input36Vdc Input36Vdc Input36Vdc Input 48Vdc Input48Vdc Input48Vdc Input48Vdc Input 75Vdc Input75Vdc Input75Vdc Input75Vdc Input ASD75-48S5EB Efficiency Curve 60% 65% 70% 75% 80% 85% 90% 95% Output Load Current; Imax = 15AOutput Load Current; Imax = 15AOutput Load Current; Imax = 15AOutput Load Current; Imax = 15A EfficiencyEfficiencyEfficiencyEfficiency 36Vdc Input36Vdc Input36Vdc Input36Vdc Input 48Vdc Input48Vdc Input48Vdc Input48Vdc Input 75Vdc Input75Vdc Input75Vdc Input75Vdc Input ASD75-48S12EB Efficiency Curve 60% 65% 70% 75% 80% 85% 90% 95% Output Load Current; Imax = 6.25 AOutput Load Current; Imax = 6.25 AOutput Load Current; Imax = 6.25 AOutput Load Current; Imax = 6.25 A EfficiencyEfficiencyEfficiencyEfficiency 36Vdc Inpit36Vdc Inpit36Vdc Inpit36Vdc Inpit 48Vdc Input48Vdc Input48Vdc Input48Vdc Input 75Vdc Input75Vdc Input75Vdc Input75Vdc Input ASD75-24S3.3EB Efficiency Curve 70% 75% 80% 85% 90% 95% Output Load Current; Imax = 20AOutput Load Current; Imax = 20AOutput Load Current; Imax = 20AOutput Load Current; Imax = 20A EfficiencyEfficiencyEfficiencyEfficiency 18Vdc Input18Vdc Input18Vdc Input18Vdc Input 24Vdc Input24Vdc Input24Vdc Input24Vdc Input 36Vdc Input36Vdc Input36Vdc Input36Vdc Input ASD75-24S5EB Efficiency Curve 65% 70% 75% 80% 85% 90% 95% Output Load Current; Imax = 15 AOutput Load Current; Imax = 15 AOutput Load Current; Imax = 15 AOutput Load Current; Imax = 15 A EfficiencyEfficiencyEfficiencyEfficiency 18Vdc Input18Vdc Input18Vdc Input18Vdc Input 24Vdc Input24Vdc Input24Vdc Input24Vdc Input 36Vdc Input36Vdc Input36Vdc Input36Vdc Input ASD75-24S12EB Efficiency Curve Output Load Current; Im ax = 6.25 AOutput Load Current; Im ax = 6.25 AOutput Load Current; Im ax = 6.25 AOutput Load Current; Im ax = 6.25 A Efficien cyEfficien cyEfficien cyEfficien cy 18Vdc Input18Vdc Input18Vdc Input18Vdc Input 24Vdc Input24Vdc Input24Vdc Input24Vdc Input 36Vdc Input36Vdc Input36Vdc Input36Vdc Input 60% 65% 70% 75% 80% 85% 90% 95% ASD75-48S3.3EB Efficiency Curve ASD75-48S5EB Efficiency Curve ASD75-24S3.3EB Efficiency CurveASD75-48S12EB Efficiency Curve ASD75-24S5EB Efficiency Curve ASD75-24S12EB Efficiency Curve 0315