QTS48T46096 DC-DC Converter Data Sheet 441-Watt @ 48Vin Quarter-Brick Bus Converter Features * * * * * * * * * * * * * * * * Applications * * * * Intermediate Bus architectures Telecommunications equipment LAN/WAN Data processing RoHS lead-free and lead-solder-exempt products are available Delivers up to 500 watts with a 55 VDC input Cost-effective, single-board design 5:1 Fixed ratio converter Ultra-high efficiency over 97% 0.48" maximum height (12.2 mm) Narrow input range 36 - 55 VDC Parallel operation (3 units) Input-to-output isolation: 1500 VDC Start-up into high capacitive load Low conducted and radiated EMI Output overcurrent protection Input undervoltage lockout Input overvoltage shutdown Overtemperature protection Approved to UL 60950-1/ CAN/CSA-C22.2 No. 60950-1-03, and TUV approved to EN 60950-1, IEC 60950-1 Description The QTS48T46096 bus converter provides a 5:1 fixed ratio, isolated, step-down voltage. Output voltage is directly proportional to input voltage with a conversion ratio of 5:1; at 48 VDC the resulting output voltage would be 9.6 VDC. The converter provides ultra-high efficiency over 97%; as a result very little heat is dissipated and a heat sink is not required. The QTS48T46096 is an excellent choice for intermediate bus applications where multiple output voltages are required and a 9.6 V rail will be used to power "Point of Load" devices. Model Selection Model QTS48T46096-NCAP Input Voltage VDC Input Current, Max ADC Output Voltage Vout,@ 48Vin VDC Output Current (A) 36-55 9.3 9.6 46 Output Ripple/Noise, mV p-p (max.) Typical Efficiency @ 48Vi, 39.5A 250 97.3 This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment should be followed. ZD-02076 Rev 2.1 Page 1 of 7 www.power-one.com QTS48T46096 DC-DC Converter Data Sheet 441-Watt @ 48Vin Quarter-Brick Bus Converter Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect longterm reliability, and cause permanent damage to the converter. Parameter Input Voltage Conditions/Description Operating Temperature Storage Temperature *Case Temperature (Q11) Continuous Min 0 Max 55 Units VDC -40 -40 125 125 C C * If necessary the factory will provide an assembly drawing upon request to locate Q11 Environmental and Mechanical Specifications All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. Parameter Shock Sinusoidal Vibration Weight Water Washing MTBF Conditions/Description (Half-sinewave, 6ms), 3 axes GR-63-CORE, Section 5.4.2 Min Standard process Per Bellcore TR-NWT-000332 Nom 50 1 1.7/48 Yes 3.5 Max Units g g Oz/g MHrs (Po= 260 W, TA = 30C) Isolation Specifications All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. Parameter Insulation Safety Rating Isolation Voltage Isolation Resistance Isolation Capacitance Conditions/Description Min Input to Output 1500 10 Nom Functional Max Units VDC MOhm pF 1100 Input Specifications All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. Parameter Input Voltage Turn-On Input Voltage Turn-Off Input Voltage Output Rise Time Input Reflected Ripple Current Inrush Transient Input Overvoltage Shutdown Turn-off voltage threshold Turn-on voltage threshold ZD-02076 Rev 2.1 Conditions/Description Continuous Ramping Up Ramping Down Time from Vo @ 10% of nominal to Vo @ 90% of Nominal, w/ Load = 365 W resistor + 3000 F capacitor Full Load, 12 H source inductance Min 36 33 31 0.5 Vin=Vin.max Vin Page 2 of 7 57 55 Nom 48 35 32 Max 55 37 33 2 Units VDC VDC VDC ms 50 mA p-p 1 A2s 59.5 58 www.power-one.com QTS48T46096 DC-DC Converter Data Sheet 441-Watt @ 48Vin Quarter-Brick Bus Converter Output Specifications All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. Parameter Conditions/Description Output Voltage over line load and temperature Output Current Io Load Regulation Vo Turn-on overshoot Vo Transient response 25% load step change @ 1A/s (% of Vo nominal) Admissible Load Capacitance Irated, Nom Vin Output Current Limit Threshold Latch-Off (recycle power or toggle shutdown pin to re-start) Po Min Max Units 6.8 Nom 11.5 VDC 0 46 A 500 mV 3 % 4 % 3000 F 300 Vo 110% Switching Frequency 130% 150% 240 kHz Feature Specifications All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. Parameter Shutdown (ON/OFF) Negative Logic Converter ON Source Current Converter OFF Positive Logic Converter ON Open Circuit Voltage Converter OFF Conditions/Description Nom Max Units 0.8 1 37 VDC mADC VDC 37 5 0.8 VDC VDC VDC +140 C % On/Off signal is low - converter is ON -0.5 ON/OFF pin is connected to -Vin 2.5 On/Off signal is low-converter is OFF 2.5 ON/OFF pin is floating -0.5 Overtemperature Protection Average board temperature Current Share Accuracy See Page 4. "Parallel Operation" ZD-02076 Rev 2.1 Min Page 3 of 7 +130 5 10 www.power-one.com QTS48T46096 DC-DC Converter Data Sheet 441-Watt @ 48Vin Quarter-Brick Bus Converter Shutdown Feature Description Characteristic Curves The ON/OFF pin in the QTS48T46096 converter functions as a normal soft shutdown. It is referenced to the -Vin pin (see Figure 2). With the positive logic, when the ON/OFF pin is pulled low, the output is turned off and the unit goes into a very low input power mode. Efficiency Vs Line, Load 99.00 Efficiency (%) 97.00 95.00 With negative logic, when the ON/OFF pin is pulled low, the unit is turned on. 93.00 36 91.00 An open collector switch is recommended to control the voltage between the ON/OFF pin and the -Vin pin of the converter. The ON/OFF pin is pulled up internally, so no external voltage source is required. The user should avoid connecting a resistor between the ON/OFF pin and the +Vin pin. 48 89.00 55 87.00 % % % 0% 10 90 80 % % % % 70 60 50 40 % 30 20 10 % 85.00 Load (%) Figure 1. QTS48T46096 Efficiency vs. Output Load Figure 2 shows the recommended connections for the QTS48T46096 converter. When the ON/OFF pin is used to achieve remote control, the user must take care to insure that the pin reference for the control is really the -Vin pin. The control signal must not be referenced ahead of EMI filtering, or remotely from the unit. Optically coupling the information and locating the optical coupler directly at the module will solve any of these problems. Note: If the ON/OFF pin is not used, it can be left floating (positive logic), or connected to the -Vin pin (negative logic). Parallel Operation Figure 2. Typical Application of QTS48T46096 The QTS48T46096 converter does not require any external components for proper operation. However, if the distribution of the input voltage to the converter contains significant inductance, a capacitor C1 may be required to enhance performance of the converter. A minimum of a 100 F electrolytic capacitor with the ESR<0.5 at 100 kHz is recommended for the QTS48T46096. Refer to the "Inrush Current Control Application Note" on www.power-one.com for suggestions on how to limit the magnitude of the inrush current. For output decoupling we recommend using a 10 F low ESR tantalum (AVX TPSC106M025R0500 is used in our test setup) and a 1 F ceramic capacitor. Note, that the capacitors do not substitute the filtering required by the load. ZD-02076 Rev 2.1 Page 4 of 7 The following precautions must be observed when operating two or more QTS48T46096's in parallel: 1. The inputs of all units must be attached to the same voltage source 2. The PCB trace resistance into each unit should be equalized as much as is practical. 3. The enable pins must be tied together and operated as a single unit. 4. The undervoltage lockout start-up point will vary from unit to unit, therefore the dv/dt of the input source as it rises from 0V to its final value will affect the ability of the parallel units to turn on into a load equal to more that the maximum rated load of 1 unit. The dv/dt of the rising edge of the input voltage must be greater than 2V/msec. If three units are to be operated in parallel, it is strongly recommended that the maximum load current be limited to the maximum current rating of a single unit until the output voltage exceeds 90% of the rated output voltage. 5. The accuracy of the current sharing will be affected by the series impedance between each unit at the load. Balancing these impedances will enhance the current share accuracy. www.power-one.com QTS48T46096 DC-DC Converter Data Sheet 441-Watt @ 48Vin Quarter-Brick Bus Converter 6. Figure 3 shows the recommended airflow direction, unit orientation and temperature variation of three paralleled units with 10% current share accuracy. Please note that the maximum power available will be reduced by up to 10% due to current share accuracy. (At 48 volts in, the maximum power available would be 350 W X 3unit X 90% derating = 945 W) voltage. Both input traces and the chassis ground trace (if applicable) must be capable of conducting a current of 1.5 times the value of the fuse without opening. The fuse must not be placed in the grounded input line, if any. In order for the output of the QTS48T46096 converter to be considered as SELV (Safety Extra Low Voltage) or TNV-1, according to all IEC60950 based standards, one of the following requirements must be met in the system design: * * * If the voltage source feeding the module is SELV or TNV, the output of the converter may be grounded or ungrounded. If the voltage source feeding the module is ELV, the output of the converter may be considered SELV only if the output is grounded per the requirements of the standard. This information is provided for guidance only and the user is responsible for any design considerations regarding safety. Thermal Considerations AIRFLOW DIRECTION Figure 3. Three units in parallel with 50 V input voltage, 900 W output power, 70 C ambient, and 200 LFM airflow. Safety Considerations The QTS48T46096 converter features 1500 Volt DC isolation from input to output. The input-to-output resistance is greater than 10 M. This converter is provided with functional insulation between input and output circuits according to all IEC60950 based standards. Nevertheless, if the system using the converter needs to receive safety agency approval, certain rules must be followed in the design of the system. In particular, all of the creepage and clearance requirements of the end-use safety requirements must be observed. These documents include UL60950 - CSA60950-00 and EN60950, although other or additional requirements may be needed for specific applications. The QTS48T46096 converter is designed for natural or forced convection cooling. The maximum allowable output current of the converter is determined by meeting the derating criteria for all components used in the converter. For example, the maximum semiconductor junction temperature is not allowed to exceed 125 C to ensure reliable longterm operation of the converter. Contact Power-One for the complete list of the derating criteria. The graph in Figure 4 and Figure 5 show the maximum output current of the QTS48T46096 converter at different ambient temperatures under both natural and forced (transverse airflow direction, from pin 1 to pin 3) convection. For example, the QTS48T46096 operating at 48Vin, 70 C can deliver up to 33.6A reliably with 200 LFM forced air. The QTS48T46096 converter has no internal fuse. The external fuse must be provided to protect the system from catastrophic failure. The fuse with a rating not greater than 10 A is recommended. The user can select a lower rating fuse based upon the highest inrush transient at the maximum input voltage and the maximum input current of the converter, which occurs at the minimum input ZD-02076 Rev 2.1 Page 5 of 7 www.power-one.com QTS48T46096 DC-DC Converter Data Sheet 441-Watt @ 48Vin Quarter-Brick Bus Converter 50 Output Current (A) 45 40 35 400 LFM 300 LFM 200 LFM 100 LFM 50 LFM 30 25 20 15 10 5 0 20 30 40 50 60 70 80 90 Ambient Temperature (C) Figure 4. Thermal Derating Curve Vin = 36V, Varying Airflow (Input Voltage Constant) Output Current (A) 50 45 40 35 400 LFM 300 LFM 200 LFM 100 LFM 50 LFM 30 25 20 15 10 5 0 20 30 40 50 60 70 80 90 Ambient Temperature (C) Figure 5. Thermal Derating Curve Vin = 48V, Varying Airflow (Input Voltage Constant) ZD-02076 Rev 2.1 Page 6 of 7 www.power-one.com QTS48T46096 DC-DC Converter Data Sheet 441-Watt @ 48Vin Quarter-Brick Bus Converter Mechanical Drawing Ordering Information Options Suffixes to add to part number Remote ON/OFF Positive- Standard, -P suffix Negative-Standard, -N suffix Pin Length 0.180"- Standard, add "CA" suffix 0.145"- Add "CB" suffix 0.110"- Add "CC" suffix Paralleling Option RoHS RoHS lead solder 1 exempt RoHS compliant for all six substances 1 2 Paralleling add "P" suffix (standard) Add to Part Number No RoHS character required. Add "G" as the last character of the part number. The solder exemption refers to all the restricted materials except lead in solder. Example: QTS with negative logic, 0.180 Pin and Paralleling the resulting part number is QTS48T46096-NCAP Notes: 1. NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of Power-One, Inc. 2. TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. ZD-02076 Rev 2.1 Page 7 of 7 www.power-one.com