ASD75EB 7 5 Wa t t , H i g h D ensity, Eighth Brick DC/DC Converter series 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 DESCRIPTION: The ASD75EB Series of products are open frame, high density, dc/dc converters 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 (2.32in. x 0.90in. x 0.37in. ) package. 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 ASD75-24S5EB ASD75-24S12EB ASD75-48S3.3EB ASD75-48S5EB ASD75-48S12EB 3.3 VDC 5 VDC 12 VDC 3.3 VDC 5 VDC 12 VDC 20 15 6.25 20 15 6.25 18-36 VDC 18-36 VDC 18-36 VDC 36-75 VDC 36-75 VDC 36-75 VDC 4.9A 5.5A 5.5A 2.5A 2.9A 2.9A 89%, typ. 90.5%, typ. 91.5%, typ. 89%, typ. 91%, typ. 92%, typ. 66 Watts 75 Watts 75 Watts 66 Watts 75 Watts 75 Watts WWW.ASTRODYNE.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 7 5 Wa t t , H i g h D ensity, Eighth Brick DC/DC Converter ASD75EB ABSOLUTE MAXIMUM RATINGS (MIN TO MAX.) ISOLATION SPECIFICATIONS Input Voltage (+In to -In) Transient Input Voltage Operating Temperature Storage Temperature (Ambient) Wave Solder Temperature Input-Output Input-Output Capacitance Isolation Resistance 24Vin: 18-36VDC Continuous 48Vin: 36-75VDC Continuous 24Vin: 50VDC (100mS max.) 48Vin: 100VDC (100mS max.) -40 to 85C (See Derate Curve) 125C 260C 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 1At 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 70C 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 105-125C, 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 Current Limit (rms.) 105-140%, Hiccup Mode Efficiency FL See Model Chart on Page 1 WWW.ASTRODYNE.COM series 1500VDC 1500pF 10M GENERAL SPECIFICATIONS MTBF Weight Dimensions 1.3Mhrs 0.72 oz (20.5g) 2.3" x 1.45" x 0.47" (58.4 x 36.8 x 12mm) CONTROL SPECIFICATIONS Input Logic Low Input Logic High Turn-On Time Trim Adjustment Range Voltage at 1mA current relative to -Vin is 1V max. Current at 0 volts is 1mA Enable pin voltage relative to -Vin is 5.5V Leakage current is 100uA 500mS, FL, o=90% Vo, set 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. 3. 25%-50%-75% load, 0.1A/uS 4. The Cold Start condition is a uniform converter temperature of -40C after thermal stabilization. An additional 2x220uF is needed for cold startup conditions. The Hot Start condition for start up is a uniform converter temperature of 65C after thermal stabilization. All specifications are typical at nominal input, full load, and 25DegC unless otherwise noted ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 7 5 Wa t t , H i g h D ensity, Eighth Brick DC/DC Converter ASD75EB series PIN OUTS Figure 1: ASD75EB Series Pin Outs OUTLINE DRAWING Figure 2: Mechanical Outline WWW.ASTRODYNE.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 7 5 Wa t t , H i g h D ensity, Eighth Brick DC/DC Converter ASD75EB series 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 converter, positive logic and negative logic. For positive logic, l eaving 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. WWW.ASTRODYNE.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 7 5 Wa t t , H i g h D ensity, Eighth Brick DC/DC Converter ASD75EB series 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. Rtrim-down = (511 / %) - 10.22 kOhms Rtrim-up = (5.11Vout|100 +% | / 1.225%) - (511/%) - 10.22 kohms Where: % = [(V nominal-V desired)/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. WWW.ASTRODYNE.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 7 5 Wa t t , H i g h D ensity, Eighth Brick DC/DC Converter ASD75EB series 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 125C, the converter will shut down immediately. The converter will attempt to restart when the temperature has dropped at least 10C 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. Pin1 Pin8 Pin3 Pin4 ASD75 Figure 5: Thermal Test Fixture Proper cooling can be verified by monitoring 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. WWW.ASTRODYNE.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 ASD75EB 7 5 Wa t t , H i g h D ensity, Eighth Brick DC/DC Converter series Thermal Characteristic Test done using Thermal Set-up of Figure 5; Vin = Vinnom ASD75-48S3.3EB Power Derating Curve ASD75-48S5EB Power Derating Curve 120% 120% 100% 0 LFM 80% 100 LFM 60% 200 LFM 40% 300 LFM Power Power 100% 100 LFM 200 LFM 60% 300 LFM 40% 400 LFM 20% 0 LFM 80% 400 LFM 20% 0% 0% 25 30 35 40 45 50 55 60 65 70 75 80 85 25 30 Temperature (C) 80 85 ASD75-24S3.3EB Power Derating Curve 120% 120% 100% 100% 0 LFM 100 LFM 200 LFM 60% 300 LFM 40% 0 LFM 80% Power 80% Power 60 65 70 75 Temperature (C) ASD75-48S12EB Power Derating Curve 100 LFM 60% 200 LFM 300 LFM 40% 400 LFM 400 LFM 20% 20% 0% 0% 25 30 35 40 45 50 55 60 65 70 75 80 25 30 85 Temperature (C) 35 40 45 50 55 60 65 70 75 80 85 Temperature (C) ASD75-24S12EB Power Derating Curve ASD75-24S5EB Power Derating Curve 120% 120% 100% 100% 0 LFM 100 LFM 200 LFM 60% 300 LFM 40% 400 LFM 20% 0 LFM 80% Power 80% Power 35 40 45 50 55 100 LFM 60% 200 LFM 300 LFM 40% 400 LFM 20% 0% 25 30 35 40 45 50 55 60 65 Temperature (C) WWW.ASTRODYNE.COM 70 75 80 85 0% 25 30 35 40 45 50 55 60 65 70 75 80 85 Temperature (C) ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 ASD75EB 7 5 Wa t t , H i g h D ensity, Eighth Brick DC/DC Converter series Efficiency Curves Ta=25oC, airflow rate = 400LFM ASD75-48S3.3EB Efficiency Curve 36Vdc Input ASD75-48S5EB Efficiency Curve 36Vdc Input 48Vdc Input 48Vdc Input 75Vdc Input 95% 95 95% 90% 90% 85% 80% Efficiency Efficiency 85% 75Vdc Input 75% 70% 80% 75% 70% 65% 65% 60% 60% 55% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 0% 100% 10% 30% 40% 50% 60% 70% ASD75-24S3.3EB Efficiency Curve 36Vdc Inpit 90% 100% 18Vdc Input 48Vdc Input 24Vdc Input 75Vdc Input 95% 80% Output Load Current; Imax = 15A Output Load Current; Imax = 20A ASD75-48S12EB Efficiency Curve 20% 36Vdc Input 95% 90% 90% Efficiency Efficiency 85% 80% 75% 85% 80% 70% 75% 65% 60% 70% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 0% 100% 10% Output Load Current; Imax = 6.25A ASD75-24S5EB Efficiency Curve 40% 50% 60% 70% ASD75-24S12EB Efficiency Curve 18Vdc Input 24Vdc Input 80% 90% 100% 18Vdc Input 24Vdc Input 36Vdc Input 95% 95% 90% 90% 85% 85% Efficiency Efficiency 30% Output Load Current; Imax = 20A 36Vdc Input 80% 75% 80% 75% 70% 70% 65% 0% 20% 65% 60% 10% 20% 30% 40% 50% 60% 70% 80% Output Load Current; Imax = 15A WWW.ASTRODYNE.COM 90% 100% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Output Load Current; Imax = 6.25A ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458