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| FEATURES High Efficiency: 90.5% @ 28V/12.5A Size: 61.0x57.9x12.7mm (2.40"x2.28"x0.50") Standard footprint Industry standard pin out Fixed frequency operation Metal baseplate Input UVLO, Output OCP, OVP, OTP Basic insulation 2250V isolation 2:1 Input voltage range ISO 9001, TL 9000, ISO 14001, QS 9000, OHSAS 18001 certified manufacturing facility UL/cUL 60950 (US & Canada) recognized, and TUV (EN60950) certified CE mark meets 73/23/EEC and 93/68/EEC directive Delphi Series H24SN, 350W Half Brick Family DC/DC Power Modules: 18~36Vin, 28V/12.5A out The Delphi Series H24SN Half Brick, 24V input, single output, isolated DC/DC converters are the latest offering from a world leader in power systems technology and manufacturing -- Delta Electronics, Inc. This product family provides up to 350 watts of power in an industry standard footprint. Typical full load efficiency for 24Vin, 28V output is 90.5%. With creative design technology and optimization of component placement, these converters possess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions. All models are fully protected from abnormal input/output voltage, current, and temperature conditions. The Delphi Series converters meet all safety requirements with basic insulation. A variety of optional heatsinks are available for extended thermal operation, as well as for use in higher air flow applications: 200 to 400 LFM. OPTIONS Positive on/off logic Short pin length APPLICATIONS Telecom/Datacom Wireless Networks Optical Network Equipment Server and Data Storage Industrial/Test Equipment DATASHEET DS_H24SN28012_07272006 TECHNICAL SPECIFICATIONS (TA=25C, airflow rate=300 LFM, Vin=24Vdc, nominal Vout unless otherwise noted.) PARAMETER ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous Transient (100ms) Operating Temperature Storage Temperature Input/Output Isolation Voltage INPUT CHARACTERISTICS Operating Input Voltage Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Voltage Maximum Input Current Minimum -Load Input Current Off Converter Input Current Inrush Current(I2t) Input Reflected-Ripple Current Input Voltage Ripple Rejection OUTPUT CHARACTERISTICS Output Voltage Set Point Output Voltage Regulation Over Load Over Line Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise Peak-to-Peak RMS Operating Output Current Range Output DC Current-Limit Inception DYNAMIC CHARACTERISTICS Output Voltage Current Transient Positive Step Change in Output Current Negative Step Change in Output Current Settling Time (within 1% Vout nominal) Turn-On Transient Start-Up Time, From On/Off Control Start-Up Time, From Input Output Capacitive Load EFFICIENCY 100% Load 60% Load ISOLATION CHARACTERISTICS Input to Output Input to Case Output to Case Isolation Resistance Isolation Capacitance FEATURE CHARACTERISTICS Switching Frequency ON/OFF Control Negative Remote On/Off logic Logic Low (Module On) Logic High (Module Off) ON/OFF Control, Positive Remote On/Off logic Logic Low (Module Off) Logic High (Module On) ON/OFF Current Leakage Current Output Voltage Trim Range Output Voltage Remote Sense Range Output Over-Voltage Protection GENERAL SPECIFICATIONS MTBF Weight Over-Temperature Shutdown NOTES and CONDITIONS Min. H24SN28012NRFA Typ. Max. Units 40 50 115 125 2250 24 17.5 16.5 1 500 15 0.5 30 60 27.72 28.00 20 20 250 28.00 60 14 0.3 120 36 18 Vdc Vdc C C Vdc Vdc Vdc Vdc Vdc A mA mA A2s mA dB Vdc mV mV mV V mV mV A % 100ms Refer to Fig.20 for measuring point -40 -55 18 15.5 100% Load, 18Vin 24 2 P-P thru 12H inductor, 5Hz to 20MHz 120 Hz Vin=48V, Io=Io.max, Tc=25C Io=Io,min to Io,max Vin=18V to 36V Tc=-40C to 100C over sample load, line and temperature 5Hz to 20MHz bandwidth Full Load, 1F ceramic, 10F Low ESR cap Full Load, 1F ceramic, 10F Low ESR cap Output Voltage 10% Low 24V, Tested with a aluminum ,10F Low ESR cap and 1F Ceramic load cap, Io/t=1A/s 50% Io.max to 75% Io.max 75% Io.max to 50% Io.max 28.28 56 112 300 28.75 150 40 12.5 27.25 400 400 300 30 30 mV mV us ms ms F % % 2250 2250 500 Vdc Vdc Vdc M pF kHz 0.8 15 0.8 15 1 50 +10 0.5 140 V V V V mA uA % V % M hours grams C Full load; 5% overshoot of Vout at startup 330 90.5 91.0 5000 10 1900 330 Von/off at Ion/off=1.0mA Von/off at Ion/off=0.0 A Von/off at Ion/off=1.0mA Von/off at Ion/off=0.0 A Ion/off at Von/off=0.0V Logic High, Von/off=15V Across Pins 9 & 5, Pout max rated power Pout max rated power Over full temp range; % of nominal Vout Io=80% of Io, max; Ta=25C Refer to Fig.20 for measuring point 0 0 -40 115 2.19 62 120 H24SN28012_07272006 2 ELECTRICAL CHARACTERISTICS CURVES Figure 1: Efficiency vs. load current for minimum, nominal, and maximum input voltage at 25C. Figure 2: Power dissipation vs. load current for minimum, nominal, and maximum input voltage at 25C. Figure 3: Input current vs. output current at low line, nominal line, and high line. Figure 4: Typical input characteristics at room temperature H24SN28012_07272006 3 ELECTRICAL CHARACTERISTICS CURVES For Negative Remote On/Off Logic Figure 5: Turn-on transient at full rated load current (resistive load) (5ms/div). CH2: Vout; 10V/div; CH3: ON/OFF input: 5V/div Figure 6: Turn-on transient at minimum load current (5ms/div). CH2: Vout: 10V/div; CH3: ON/OFF input: 5V/div H24SN28012_07272006 4 ELECTRICAL CHARACTERISTICS CURVES Figure 7: Output voltage response to step-change in load current (75%-50% of Io, max; di/dt = 1A/s). Load cap: 330F aluminum ,10uF Low ESR capacitor and 1F ceramic capacitor. Top Trace: Vout (100mV/div), Bottom Trace: Iout (1A/div). Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module. Figure 8: Output voltage response to step-change in load current (50%-75% of Io, max; di/dt = 1A/s). Load cap: 330F aluminum,10uF Low ESR capacitor and 1F ceramic capacitor. Top Trace: Vout (100mV/div), Bottom Trace: Iout (1A/div). Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module. Figure 9: Test set-up diagram showing measurement points for Input Terminal Ripple Current and Input Reflected Ripple Current. Note: Measured input reflected-ripple current with a simulated source Inductance (LTEST) of 12 H. Capacitor Cs offset possible battery impedance. Measure current as shown above. H24SN28012_07272006 5 ELECTRICAL CHARACTERISTICS CURVES Figure 10: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 12H source impedance and 220F electrolytic capacitor (1A/div). Figure 11: Input reflected ripple current, is, through a 12H source inductor at nominal input voltage and rated load current (10 mA/div) Copper Strip Vo(+) 10u Vo(-) 1u SCOPE RESISTIVE LOAD Figure 12: Output voltage noise and ripple measurement test setup H24SN28012_07272006 6 ELECTRICAL CHARACTERISTICS CURVES Figure 13: Output voltage ripple at nominal input voltage and rated load current (50 mV/div). Load capacitance:330uF aluminum, 1F ceramic capacitor and 10Flow ESR capacitor. Bandwidth: 20 MHz. Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module. Figure 14: Output voltage vs. load current showing typical current limit curves and converter shutdown points. H24SN28012_07272006 7 DESIGN CONSIDERATIONS Input Source Impedance The impedance of the input source connecting to the DC/DC power modules will interact with the modules and affect the stability. A low ac-impedance input source is recommended. If the source inductance is more than a few H, we advise adding a 220 to 470 F electrolytic capacitor (ESR < 0.1 at 100 kHz) mounted close to the input of the module to improve the stability. The input source must be insulated from the ac mains by reinforced or double insulation. The input terminals of the module are not operator accessible. If the metal baseplate is grounded, one Vi pin and one Vo pin shall also be grounded. A SELV reliability test is conducted on the system where the module is used, in combination with the module, to ensure that under a single fault, hazardous voltage does not appear at the module's output. When installed into a Class II equipment (without grounding), spacing consideration should be given to the end-use installation, as the spacing between the module and mounting surface have not been evaluated. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. This power module is not internally fused. To achieve optimum safety and system protection, an input line fuse is highly recommended. The safety agencies require a normal-blow fuse with 20A maximum rating to be installed in the ungrounded lead. A lower rated fuse can be used based on the maximum inrush transient energy and maximum input current. Layout and EMC Considerations Delta's DC/DC power modules are designed to operate in a wide variety of systems and applications. For design assistance with EMC compliance and related PWB layout issues, please contact Delta's technical support team. An external input filter module is available for easier EMC compliance design. Application notes to assist designers in addressing these issues are pending release. Safety Considerations The power module must be installed in compliance with the spacing and separation requirements of the end-user's safety agency standard, i.e., UL60950, CAN/CSA-C22.2 No. 60950-00 and EN60950:2000 and IEC60950-1999, if the system in which the power module is to be used must meet safety agency requirements. Basic insulation based on 75 Vdc input is provided between the input and output of the module for the purpose of applying insulation requirements when the input to this DC-to-DC converter is identified as TNV-2 or SELV. An additional evaluation is needed if the source is other than TNV-2 or SELV. When the input source is SELV, the power module meets SELV (safety extra-low voltage) requirements. If the input source is a hazardous voltage which is greater than 60 Vdc and less than or equal to 75 Vdc, for the module's output to meet SELV requirements, all of the following must be met: Soldering and Cleaning Considerations Post solder cleaning is usually the final board assembly process before the board or system undergoes electrical testing. Inadequate cleaning and/or drying may lower the reliability of a power module and severely affect the finished circuit board assembly test. Adequate cleaning and/or drying is especially important for un-encapsulated and/or open frame type power modules. For assistance on appropriate soldering and cleaning procedures, please contact Delta's technical support team. H24SN28012_07272006 8 FEATURES DESCRIPTIONS Over-Current Protection The modules include an internal output over-current protection circuit, which will endure current limiting for an unlimited duration during output overload. If the output current exceeds the OCP set point, the modules will automatically shut down (hiccup mode). The modules will try to restart after shutdown. If the overload condition still exists, the module will shut down again. This restart trial will continue until the overload condition is corrected. Vi(+) Vo(+) Sense(+) ON/OFF Sense(-) Vi(-) Vo(-) Figure 15: Remote on/off implementation Remote Sense Remote sense compensates for voltage drops on the output by sensing the actual output voltage at the point of load. The voltage between the remote sense pins and the output terminals must not exceed the output voltage sense range given here: [Vo(+) - Vo(-)] - [SENSE(+) - SENSE(-)] 10% x Vout Over-Voltage Protection The modules include an internal output over-voltage protection circuit, which monitors the voltage on the output terminals. If this voltage exceeds the over-voltage set point, the module will shut down and latch off. The over-voltage latch is reset by either cycling the input power or by toggling the on/off signal for one second. Over-Temperature Protection The over-temperature protection consists of circuitry that provides protection from thermal damage. If the temperature exceeds the over-temperature threshold the module will shut down. The module will try to restart after shutdown. If the over-temperature condition still exists during restart, the module will shut down again. This restart trial will continue until the temperature is within specification. This limit includes any increase in voltage due to remote sense compensation and output voltage set point adjustment (trim). Vi(+) Vo(+) Sense(+) Sense(-) Contact Resistance Vi(-) Vo(-) Contact and Distribution Losses Remote On/Off The remote on/off feature on the module can be either negative or positive logic. Negative logic turns the module on during a logic low and off during a logic high. Positive logic turns the modules on during a logic high and off during a logic low. Remote on/off can be controlled by an external switch between the on/off terminal and the Vi(-) terminal. The switch can be an open collector or open drain. For negative logic if the remote on/off feature is not used, please short the on/off pin to Vi(-). For positive logic if the remote on/off feature is not used, please leave the on/off pin to floating. Figure 16: Effective circuit configuration for remote sense operation If the remote sense feature is not used to regulate the output at the point of load, please connect SENSE(+) to Vo(+) and SENSE(-) to Vo(-) at the module. The output voltage can be increased by both the remote sense and the trim; however, the maximum increase is the larger of either the remote sense or the trim, not the sum of both. When using remote sense and trim, the output voltage of the module is usually increased, which increases the power output of the module with the same output current. Care should be taken to ensure that the maximum output power does not exceed the maximum rated power. H24SN28012_07272006 9 FEATURES DESCRIPTIONS (CON.) Output Voltage Adjustment (TRIM) To increase or decrease the output voltage set point, the modules may be connected with an external resistor between the TRIM pin and either the SENSE(+) or SENSE(-). The TRIM pin should be left open if this feature is not used. Figure 18: Circuit configuration for trim-up (increase output voltage) Figure 17: Circuit configuration for trim-down (decrease output voltage) If the external resistor is connected between the TRIM and SENSE (+) the output voltage set point increases (Fig. 18). The external resistor value required to obtain a percentage output voltage change % is defined as: Rtrim up= Vo ( 100 + %) 1.225 % - 100 + 2% % If the external resistor is connected between the TRIM and SENSE (-) pins, the output voltage set point decreases (Fig. 17). The external resistor value required to obtain a percentage of output voltage change % is defined as: Rtrim down= Ex. When Trim-up +10%(28.0Vx1.1=30.8V) Vo := 28.0 V Vo ( 100 + ) 1.225 := 10 100 + 2 100 - 2 % Ex. When Trim-down -60%(28.0Vx0.6=16.8V) Vo := 28.0 V := 40 100 - 2 = 0.5 K - = 239.429 K The output voltage can be increased by both the remote sense and the trim, however the maximum increase is the larger of either the remote sense or the trim, not the sum of both. When using remote sense and trim, the output voltage of the module is usually increased, which increases the power output of the module with the same output current. Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power. H24SN28012_07272006 10 THERMAL CONSIDERATIONS Thermal management is an important part of the system design. To ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the module. Convection cooling is usually the dominant mode of heat transfer. Hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel. Thermal Derating Heat can be removed by increasing airflow over the module. The module's maximum case temperature is 115. To enhance system reliability, the power module should always be operated below the maximum operating temperature. If the temperature exceeds the maximum module temperature, reliability of the unit may be affected. Thermal Testing Setup Delta's DC/DC power modules are characterized in heated vertical wind tunnels that simulate the thermal environments encountered in most electronics equipment. This type of equipment commonly uses vertically mounted circuit cards in cabinet racks in which the power modules are mounted. The following figure shows the wind tunnel characterization setup. The power module is mounted on a test PWB and is vertically positioned within the wind tunnel. The space between the neighboring PWB and the top of the power module is constantly kept at 6.35mm (0.25''). THERMAL CURVES FACING PWB PWB MODULE Figure 20: Temperature measurement location The allowed maximum hot spot temperature is defined at 115 Output Power (W) 400 H24SN28012NR A (Standard) Output Power vs. Hot Spot Temperature (Either Orientation) 350 300 AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE AIR FLOW 250 200 50.8 (2.0") 150 100 50 12.7 (0.5") 0 25 35 45 55 65 75 85 Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches) 95 105 Hot Spot Temperature() Figure 19: Wind Tunnel Test Setup Figure 21: Output power vs. hot spot temperature (Either Orientation) H24SN28012_07272006 11 MECHANICAL DRAWING Pin No. 1 2 3 4 5 6 7 8 9 Name -Vin SYNC IN ON/OFF +Vin +Vout +SENSE TRIM -SENSE -Vout Function Negative input voltage Frequency Synchronization Remote ON/OFF Positive input voltage Positive output voltage Positive remote sense Output voltage trim Negative remote sense Negative output voltage Pin Specification: Pins 1-4, 6-8 Pins 5 & 9 1.00mm (0.040") diameter 2.00mm (0.079") diameter All pins are copper with Tin plating. H24SN28012_07272006 12 PART NUMBERING SYSTEM H Form Factor H- Half Brick 24 S N 280 Output Voltage 120- 12V 280- 28V 12 Output Current 12- 12.5A 29- 29A N ON/OFF Logic N- Negative P- Positive R Pin Length R- 0.170" N- 0.145" K- 0.110" F A Option Code Input Number of Product Voltage Outputs Series 24V S- Single N- 350W series F- RoHS 6/6 (Lead Free) A - Standard Functions B- no thread heatsink mounting hole MODEL LIST MODEL NAME H24SN28012NRFA 18V~36V INPUT 24A 28V OUTPUT 12.5A EFF @ 100% LOAD 90.5% Default remote on/off logic is negative and pin length is 0.170" For different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales CONTACT: www.delta.com.tw/dcdc USA: Telephone: East Coast: (888) 335 8201 West Coast: (888) 335 8208 Fax: (978) 656 3964 Email: DCDC@delta-corp.com Europe: Phone: +41 31 998 53 11 Fax: +41 31 998 53 53 Email: DCDC@delta-es.com Asia & the rest of world: Telephone: +886 3 4526107 ext 6220 Fax: +886 3 4513485 Email: DCDC@delta.com.tw WARRANTY Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon request from Delta. Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications at any time, without notice. H24SN28012_07272006 13 |
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