Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 1 AVO250-48S28B 250 Watts Eighth-brick Converter Total Power: 250 Watts Input Voltage: 36 to 75 Vdc # of Outputs: Single Special Features • Delivering up to 9A output current • Ultra-high efficiency 93% typ. at full load • Wide input range: 36V ~ 75V • Excellent thermal performance • No minimum load requirement • Basic isolation • High power density • Low output noise • Reflow soldering-able • RoHS 6 compliant • Remote control function • Remote output sense • Trim function: 64% ~ 116% • Input under voltage lockout • Output over current protection • Output short circuit protection • Output over voltage protection • Over temperature protection • Industry standard eighth-brick pinout outline • Baseplate Safety IEC/EN/UL/CSA 60950 CE Mark UL/TUV EN55022 Class A Product Descriptions The AVO250-48S28B is a single output DC/DC converter with standard eighthbrick form factor and pin configuration. It delivers up to 9A output current with 28V output. Ultra-high 93% efficiency and excellent thermal performance makes it an ideal choice for using in telecommunication and datacom applications and can operate under an ambient temperature range of -40 OC ~ +85 OC, with full power available when the baseplate of the unit is kept below 100 OC. Applications This family of units has been specifically designed to support the rigors of the supply of power to RF Power Amplifiers in small-cell, low power applications in Telecommunication applications. The small form-factor, baseplate construction are exceptionally well suited for such applications where small space and contact-cooling are essential attributes required of the DCDC converter. Add this to the wide output trim range of 18V to 32V means that this unit is extremely versatile in the applications that it can address. Typically, this unit is used along side a member of the AVD (1/16th brick) family of DCDC converters to provide the lower voltage required to supply power to digital circuitry present in such RF Power-Amplifier applications. Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 2 Model Numbers Standard Output Voltage Structure Remote ON/OFF logic RoHS Status AVO250-48S28PB-6L 28Vdc Baseplate Positive R6 AVO250-48S28B-6L 28Vdc Baseplate Negative R6 Ordering information AVO250 - ① 48 S 28 P B ② ③ ④ ⑤ ⑥ - ① Model series AVO: series name , 250:output power 250W ② Input voltage 48: 36V ~ 75V input range, rated input voltage 48V ③ Output number S: single output ④ Rated output voltage 28: 28V output ⑤ Remote ON/OFF logic Default: negative logic; P: positive logic ⑥ Baseplate B: with baseplate; default: open frame ⑦ Pin length S: SMT; 6: 3.8mm ± 0.25mm ⑧ RoHS status Y: Rohs, R5; L: RoHS, R6 Options None Artesyn Embedded Technologies 6 L ⑦ ⑧ Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 3 Electrical Specifications Absolute Maximum Ratings Stress in excess of those listed in the “Absolute Maximum Ratings” may cause permanent damage to the power supply. These are stress ratings only and functional operation of the unit is not implied at these or any other conditions above those given in the operational sections of this TRN. Exposure to any absolute maximum rated condition for extended periods may adversely affect the power supply’s reliability. Table 1. Absolute Maximum Ratings: Parameter Model Symbol Min Typ Max Unit All All VIN,DC - - 80 100 Vdc Vdc Maximum Output Power All PO,max - - 250 W Ambient Operating Temperature All TA -40 - +85 OC 1500 1000 500 - - Vdc Vdc Vdc +100 OC Input Voltage Operating -Continuous Non-operating -100mS Isolation Voltage1 Input to outputs Input to metal Output to metal All Operating baseplate temperature2 All Storage Temperature All Voltage at remote ON/OFF pin -40 -55 - +125 OC All -0.3 - 5 Vdc All All - - 95 95 % % TSTG Humidity (non-condensing) Operating Non-operating Note 1 - 1mA for 60s, slew rate of 1500V/10s. Note 2 - See thermal derating of output power in Table 6. Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 4 Input Specifications Table 2. Input Specifications: Conditions1 Symbol Min Typ Max Unit All VIN,DC 36 48 75 Vdc Turn-on Voltage Threshold IO = IO,max VIN,ON 31 - 36 Vdc Turn-off Voltage Threshold IO = IO,max VIN,OFF 30 - 35 Vdc Lockout Voltage Hysteresis IO = IO,max 1 - 3 V - - 8 A - - 15 A 220 - - uF - 11 - mA 92 92 88 93 93 91 - % Parameter Operating Input Voltage, DC Maximum Input Current (IO = IO,max) VIN,DC = 36VDC Recommended Input Fuse Fast blow external fuse recommended Recommended External Input Capacitance Low ESR capacitor recommended Input Reflected Ripple Current Through 12uH inductor Operating Efficiency TA=25 OC IO = 100%IO,max IO = 50%IO,max IO = 20%IO,max IIN,max CIN η Note 1 - Ta = 25 OC, airflow rate = 400 LFM, Vin = 48Vdc, nominal Vout unless otherwise noted. Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 5 Output Specifications Table 3. Output Specifications: Parameter Factory Set Voltage Total Regulation Condition1 Symbol Min Typ Max Unit VIN,DC = 48VDC IO=IO,max VO 27.72 28 28.28 Vdc Inclusive of line, load temperature change, warm-up drift VO 27.2 28 28.8 Vdc %VO - - 0.5 % Vo - - 140 mV %VO - - 0.5 % Vo - - 140 mV Output Voltage Line Regulation All Output Voltage Load Regulation All Output Voltage Temperature Regulation All %VO - - 0.02 %/OC Output Voltage Trim Range All VO 18 - 32.5 V Measure with a 1uF ceramic capacitor in parallel with a 10uF tantalum capacitor, 0 to 20MHz bandwidth VO - 40 - mVPK-PK All IO 0 - 9 A IO 9.9 - 18 A Output Ripple, pk-pk Output Current Output DC current-limit inception2 VO Load Capacitance3 All CO 680 1000 4400 uF VO Dynamic Response 25% ~ 50% ~ 25% load change slew rate = 0.1A/us ±VO Ts - 75 0 - mV uSec 50% ~ 75% ~ 50% load change slew rate = 0.1A/us ±VO Ts - 80 0 - mV uSec Rise time IO = Imax Trise - 60 100 mS Turn-on delay time IO = Imax Tturn-on - 60 100 mS Output voltage overshoot IO = 0 %VO - - 5 % Peak Deviation Settling Time Turn-on transient Note 1 - Ta = 25 OC, airflow rate = 400 LFM, Vin = 48Vdc, nominal Vout unless otherwise noted. Note 2 - Hiccup: auto-restart when over-current condition is removed. Note 3 - High frequency and low ESR is recommended. Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 6 Output Specifications Table 3. Output Specifications, con’t: Parameter Switching frequency Condition1 Symbol Min Typ Max Unit All f SW - 150 - KHz Remote ON/OFF control (Negative logic) Off-state voltage All 3.5 - 5 V On-state voltage All -0.3 - 1.2 V Remote ON/OFF control (Positive logic) On-state voltage All 3.5 - 5 V Off-state voltage All -0.3 - 1.2 V Output over-voltage protection4 All %VO 120 - 135 % Output over-temperature protection5 All T 100 110 130 OC Over-temperature hysteresis All T 5 - - OC - 1.5 - 106 h MTBF Telcordia SR-3322006; 80% load, 300LFM, 40 OC TA Note 4 - Hiccup: auto-restart when over-voltage condition is removed. Note 5 - Auto recovery. Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 7 AVO250-48S28B Performance Curves Figure 1: AVO250-48S28B Input Reflected Ripple Current Waveform Figure 2: AVO250-48S28B Ripple and Noise Measurement Ch 3: Iin (2uS/div, 10mA/div) Ch 3: Vo (2us/div, 20mV/div) Figure 3: AVO250-48S28B Turn On Characteristic (50ms/div) Figure 4: AVO250-48S28B Turn Off Characteristic (1S/div) Ch 1: Vin (20V/div) Ch 1: Vin (20V/div) Figure 5: AVO250-48S28B Remote ON Waveform (5mS/div) Figure 6: AVO250-48S28B Remote OFF Waveform (50mS/div) Ch 1: Vo (10V/div) Ch 1: Vo (10V/div) Ch 3: Vo (10V/div) Ch 3: Remote ON Artesyn Embedded Technologies (2V/div) Ch 3: Vo (10V/div) Ch 3: Remote OFF (2V/div) Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 8 AVO250-48S28B Performance Curves Figure 7: AVO250-48S28B Transient Response (2mS/div) 25%~50%~25% load change, 0.1A/uS slew rate, (50mV/div) Ch 3: Io (2A/div) Ch 1: Vo Figure 8: Ch 1: Vo Effiency (%) 95.00 92.50 90.00 87.50 85.00 Vin=36V 82.50 Vin=48V Vin=75V 80.00 1 Figure 9: 2 3 4 5 6 Output current (A) 7 8 9 AVO250-48S28B Efficiency Curves @ 25 degC, 400LFM, 28Vo Loading: Io = 10% increment to 9A Artesyn Embedded Technologies AVO250-48S28B Transient Response (2mS/div) 50%~75%~50% load change, 0.1A/uS slew rate, (50mV/div) Ch 3: Io (2A/div) Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 9 Mechanical Specifications Mechanical Outlines Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 10 Pin length option Device code suffix L -4 4.8mm±0.25 mm -6 3.8mm±0.25 mm -8 2.8mm±0.25 mm None 5.8mm±0.25 mm Pin Designations Pin No. Name Function 1 Vin+ Positive input terminal 2 Remote ON/OFF ON/OFF control terminal 3 Vin- Negative input terminal 4 Vo- Negative output terminal 5 S- Negative remote sense 6 Trim Output voltage trim 7 S+ Positive remote sense 8 Vo+ Positive output terminal Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 11 Environmental Specifications EMC Immunity AVO200-48S05-6L power supply is designed to meet the following EMC immunity specifications: Table 4. Environmental Specifications: Document Criteria Description EN55022, Class A Limits A Conducted and Radiated EMI Limits IEC/EN 61000-4-2, Level 3 B Electromagnetic Compatibility (EMC) - Testing and measurement techniques - Electrostatic discharge immunity test. Enclosure Port IEC/EN 61000-4-6, Level 2 A Electromagnetic Compatibility (EMC) - Testing and measurement techniques, Continuous Conducted Interference. DC input port IEC/EN 61000-4-4, Level3 B Electromagnetic Compatibility (EMC) - Testing and measurement techniques, Electrical Fast Transient. DC input port. IEC/EN 61000-4-5 B Electromagnetic Compatibility (EMC) - Testing and measurement techniques, Immunity to surges - 600V common mode and 600V differential mode for DC ports EN61000-4-29 B Electromagnetic Compatibility (EMC) - Testing and measurement techniques, Voltage Dips and short interruptions and voltage variations. DC input port. Criterion A: Normal performance during and after test. Criterion B: For EFT and surges, low-voltage protection or reset is not allowed. Temporary output voltage fluctuation ceases after the disturbances ceases, and from which the EUT recovers its normal performance automatically. For dips and ESD, output voltage fluctuation or reset is allowed during the test, but recovers to its normal performance automatically after the disturbance ceases. . Criterion C: Temporary loss of output, the correction of which requires operator intervention. Criterion D: Loss of output which is not recoverable, owing to damage to hardware. Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 12 Environmental Specification EMC Test Conditions U1 In+ U2 Out+ 1320uH Vin+ 0.022uF C1 0.1uF 1uF C2 C3 C4 DC/DC 0.022uF Out- In- Vo+ Vin- Vo- PE Resistive load EMI filter Figure 10 EMC test configuration U1: Input EMC filter U2: Module to test, AVO250-48S28B C1 ~ C4: See Figure 19 Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 13 Safety Certifications The AVO250-48S28B power supply is intended for inclusion in other equipment and the installer must ensure that it is in compliance with all the requirements of the end application. This product is only for inclusion by professional installers within other equipment and must not be operated as a stand alone product. Table 5. Safety Certifications for AVO200-48S28-6L power supply system: Document File # Description UL/CSA 60950 US and Canada Requirements EN60950 European Requirements IEC60950 International Requirements CE CE Marking Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 14 Operating Temperature The AVO250-48S28B power supply will start and operate within stated specifications at an ambient temperature from -40 OC to 85 OC under all load conditions. The storage temperature is -55 OC to 125 OC. . Thermal Considerations The converter can both operate in two different modes. Mode 1: The converter can operate in an enclosed environment without forced air convection. Cooling of the converter is achieved mainly by conduction from the baseplate to a heat sink. The converter can deliver full output power at 85 OC ambient temperature provided the baseplate temperature is kept the max values 100 OC. P1 in Figure 11 is the baseplate test point. Test data listed in Table 6. Table 6. Thermal derating at different input voltage: Vin Output Current (max) 36V 4.8A 48V 4.3A 60V 3.8A 75V 3.1A Mode 2: The converter is designed to operate in different thermal environments and sufficient cooling must be provided. Proper cooling of the DC/DC converter can be verified by measuring the temperature at the test point as shown in the Figure 11. The temperature at this point should not exceed the maximum values in the table 7. Test point on baseplate Test point on PCB Figure 11 Temperature test points Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 15 Table 7. Temperature limit of the test points: Test point Temperature limit P1 113 OC P2 118 OC The converter can operate with a smaller heatsink and sufficient airflow. Figure 13 shows the derating output current vs. ambient air temperature at different air velocity with a specified heatsink. Figure 14 shows the thermal image taken by a RF camera at a rated I/O condition. Figure 12-1 Typical test condition, heatsink size (L*W*H): 57.9mm*22.86*12.7mm Figure 12-2 Heatsink mechanical diargram Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 16 For a typical application, Figure 13 shows the derating of output current vs. ambient air temperature at different air velocity. 9 Output current Io (A) 7.5 6 4.5 3 1.5 0 25 40 55 Temperature: Ta (℃ ℃) 70 600LFM(3m/s) 500LFM(2.5m/s) 400LFM(2m/s) 300LFM(1.5m/s) 200LFM(1m/s) 100LFM(0.5m/s) 85 0LFM(0m/s) Figure 13 Output power derating, 48Vin, air flowing across the converter from pin 3 to pin 1 Figure 14 Infrared thermal image, 48Vin@full load, 200LFM, 25℃ Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 17 Qualification Testing Table 8. Qualification Testing: Parameter Unit (pcs) Test condition Halt test 4-5 Ta,min-10 OC to Ta,max+10 OC , 5 OC step, Vin = min to max, 0 ~ 105% load Vibration 3 Frequency range: 5Hz ~ 20Hz, 20Hz ~ 200Hz, A.S.D: 1.0m2/s3, -3db/oct, axes of vibration: X/Y/Z. Time: 30min/axes Mechanical Shock 3 30g, 6ms, 3axes, 6directions, 3time/direction Thermal Shock 3 -40 OC to +100 OC , unit temperature 20 cycles Thermal Cycling 3 -40 OC to 85 OC, temperature change rate: 1OC/min, cycles: 2cycles Humidity 3 40 OC, 95%RH, 48h Solder Ability 15 IPC J-STD-002C-2007 Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 18 Application Notes Typical Application Below is the typical application of the AVO250-48S28B power supply. Figure 15 Typical application C1 C7: SMD ceramic-100V-1000nF-X7R-1210. C2: SMD ceramic-100V-100nF-±10%-X7R-1206. C3: 220μF/100V electrolytic capacitor; P/N: UPM1A221MED or equivalent caps. C6: 680μF/50V electrolytic capacitor; P/N: UPM1A221MED+ UPM1A471MHD or equivalent caps. C4 C5: SMD ceramic-0.1U/1000V/X7R- 2220. L1: 809uH-±25%-9.7A-R5K-28*26*12.7mm. Fuse: External fast blow fuse with a rating of 15A. The recommended fuse model is 0314015.P from LITTLEFUSE. . Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 19 Remote ON/OFF Either positive or negative remote ON/OFF logic is available in AVO250-48S28B. The logic is CMOS and TTL compatible. The voltage between pin Remote ON/OFF and pin Vin- must not exceed the range listed in table 1 to ensure proper operation. The external Remote ON/OFF circuit is highly recommended as shown in figure 16. Vin+ Vin+ Vo+ Remote ON/OFF Remote ON/OFF Trim Vo- Vin- Isolated remote ON/OFF circuit Vin- Trim Vo- Non-isolated remote ON/OFF circuit Figure 16 External Remote ON/OFF circuit Artesyn Embedded Technologies Vo+ Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 20 Trim Characteristics Connecting an external resistor between Trim pin and Vo- pin will decrease the output voltage. While connecting it between Trim and Vo+ will increase the output voltage. The following equations determine the external resistance to obtain the trimmed output voltage. 100% Radj _ down = ( − 2)kΩ ∆% Radj _ up = ( Vo (100% + ∆%) 100% + 2 × ∆% − )kΩ 1.225 × ∆% ∆% △:Output e rate against nominal output voltage. ∆= 100 × (Vnom − Vo ) Vnom Vnom: Nominal output voltage. For example, to get 32.5V output, the trimming resistor is ∆= 100 × (Vnom − Vo ) 100 × (32.5 − 28) = = 16.07 Vnom 28 R adj −up = 32.5(100 + 16.07 ) 100% + 2 × 16.07% = 189.6( KΩ) − 1.225 × 16.07 16.07% For 1% adjustment resistor, the trimed output voltage is guaranteed within ±2%. When trimming up, the output current should be decreased accordingly so as not to exceed the maximum output power. Vo+ Vo+ S+ S+ Load Trim R trim _up Cout Load Trim Cout S- S- Vo- Vo- Figure 17 Trim up R trim _down Figure 18 Trim down For AVO250-48S28B, if the sense compensate function is not necessary, connect S+ to Vo+ and S- to Vo- directly. Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 21 Input Ripple & Output Ripple & Noise Test Configuration Probe Current probe 50mm L1 Vin+ Cin C1 Vo+ C2 C3 DC/DC C4 Load Vdc Vin- Vo- Figure 19 Input ripple & inrush current, output ripple & noise test configuration Vdc: DC power supply L1: 12uH Cin: 220μF/100V typical C1: 220μF/100V electrolytic capacitor, High frequency and low ESR C2 C3: SMDceramic-100V-1000nF-X7R-1210 C4: 1000μF/50V electrolytic capacitor, High frequency and low ESR Note: It is recommended to use a coaxial cable with series 50Ω resistor and 0.68μF ceramic capacitor or a ground ring of probe to test output ripple & noise. Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 22 Soldering The product AVO250-48S28B and AVO250-48S28PB-6L are intended for standard manual, reflow or wave soldering. When reflow soldering is used, the temperature on pins is specified to maximum 260 OC for maximum 10s. When wave soldering is used, the temperature on pins is specified to maximum 260 OC for maximum 7s. When manual soldering is used, the iron temperature should be maintained at 300 OC ~ 380 OC and applied to the converter pins for less than 10s. Longer exposure can cause internal damage to the converter. Cleaning of solder joint can be performed with cleaning solvent IPA or similative. . Artesyn Embedded Technologies Technical Reference Note Rev.09.30.14_#1.0 AVO250-48S28B Page 23 Hazardous Substances Announcement (RoHS of China) Parts Hazardous Substances Pb Hg Cd Cr6+ PBB PBDE AVO250-48S28B-6 x x x x x x AVO250-48S28PB-6L x x x x x x х: Means the content of the hazardous substances in all the average quality materials of the part is within the limits specified in SJ/T-11363-2006 √: Means the content of the hazardous substances in at least one of the average quality materials of the part is outside the limits specified in SJ/T11363-2006 Artesyn Embedded Technologies has been committed to the design and manufacturing of environment-friendly products. It will reduce and eventually eliminate the hazardous substances in the products through unremitting efforts in research. However, limited by the current technical level, the following parts still contain hazardous substances due to the lack of reliable substitute or mature solution: 1. Solders (including high-temperature solder in parts) contain plumbum. 2. Glass of electric parts contains plumbum. 3. Copper alloy of pins contains plumbum For more information: www.artesyn.com/power For support: [email protected]