QTS48T25120 DC-DC Series Data Sheet 300-Watt 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 Cost-effective, single board design Ultra-high efficiency 96.2% @ full load Low profile - 0.400" (10.16 mm) Narrow Input Range 42 - 53 VDC Paralleling option Input-to-output isolation: 2000 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/ CAN/CSA-C22.2 No. 60950-00, and TUV approved to EN 60950-1, IEC 60950-1 Description The QTS48T25120 bus converter provides an isolated step-down voltage from 48V to 12.0V nominal. The QTS is an unregulated converter; therefore output voltage is directly proportional to input voltage with a conversion ratio of 4:1. The converter provides ultra-high efficiency; as a result very little heat is dissipated and a heat sink is not required. The QTS48T25120 is an excellent choice for intermediate bus application where multiple output voltages are required and a 12.0V rail will be used to power point-of-load devices. Model Selection Input Voltage VDC Input Current, Max ADC Output Voltage Vout,@ 48Vin VDC Output Current ADC mV p-p (typ.) Typical Efficiency @ 48Vi, 25A QTS48T25120-NDA0 42-53 7.5 12.0 25 75 96.2 QTS48T25120-NCAS2 38-53 7.5 12.0 25 75 96.2 Model Output Ripple/Noise, This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment should be followed. MAY 31, 2005 revised to JUN 15, 2006 Page 1 of 8 www.power-one.com QTS48T25120 DC-DC Series Data Sheet 300-Watt 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 PC Board Temperature Continuous Min 0 Max 53 Units VDC -40 -40 120 125 C C 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 @ 35C Nom 50 1 1.2/35 Yes 2,100 Max Units g g Oz/g kHrs 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 2000 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 Turn On Time Input Reflected Ripple Current Conditions/Description QTS48T25120-NDAX - Continuous QTS48T25120-NDAS2 - Continuous QTS48T25120-NDAX - Ramping Up QTS48T25120-NDAS2 - Ramping Up QTS48T25120-NDAX - Ramping Down QTS48T25120-NDAS2 - Ramping Down Within 1% of Vo nominal Inrush Transient Input Over-voltage Shutdown Turn-off voltage threshold Turn-on voltage threshold MAY 31, 2005 revised to JUN 15, 2006 Min 42 38 38 36 Nom 48 48 40.5 36.5 Max 53 53 41.3 37.3 Units VDC 36 37.5 40.5 VDC 34 34.5 35.3 Full Load, 12H source inductance 20 50 ms mA p-p Vin=Vin.max 1 A2s Vin Page 2 of 8 3 VDC 55 52 57 54 58 55 www.power-one.com QTS48T25120 DC-DC Series Data Sheet 300-Watt 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 Over input voltage range Min Max Units 9.7 Nom 13.5 VDC 0 25 A Load Regulation Vo 500 mV Turn-on overshoot Vo 3 % Transient response 25% load step change @ 1A/uS (% of Vo nominal) +/-3 % Admissible Load Capacitance Irated, Nom Vin 3000 F Output Current Limit Threshold Auto Re-start (Latch if parallel option is selected) A Vo 110% Switching Frequency 125% 150% 360 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 Min Nom Max Units 0.8 1 Vin VDC mADC VDC -0.5 Vin 5 0.8 VDC VDC VDC +120 +130 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 Overtemperature Protection MAY 31, 2005 revised to JUN 15, 2006 2.5 ON/OFF pin is floating Average board temperature Page 3 of 8 www.power-one.com QTS48T25120 DC-DC Series Data Sheet 300-Watt Quarter-Brick Bus Converter The QTS48T25120 converter does not require any external components for proper operation. However, if the distribution of the input voltage to the converter contains significant inductance, the capacitor C1 may be required to enhance performance of the converter. A minimum of a 100F electrolytic capacitor (with ESR<0.5 @ 100kHz) mounted close to the input side of the power module will ensure stability of the unit. Characteristic Curves 98 Efficiency vs Load Current 96 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. Efficiency in % 94 92 For output decoupling we recommend to use a 10F low ESR tantalum (AVX TPSC106M025R0500 is used in our test setup) and a 1F ceramic capacitors. Note, that the capacitors do not substitute the filtering required by the load. 90 42V Input 88 48V Input 53V Input 86 Shutdown Feature Description 84 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Percentage of Full Load Figure 1. QTS48T25120 Efficiency vs. Output Load The ON/OFF pin in the QTS48T25120 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. With negative logic, when the ON/OFF pin is pulled low, the unit is turned on. Typical Application Figure 2 shows the recommended connections for the QTS48T25120 converter. 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. 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. Figure 2. Typical Application of QTS48T25120 Note: If the ON/OFF pin is not used, it can be left floating (positive logic), or connected to the -Vin pin (negative logic). MAY 31, 2005 revised to JUN 15, 2006 Page 4 of 8 www.power-one.com QTS48T25120 DC-DC Series Data Sheet 300-Watt Quarter-Brick Bus Converter based standards, one of the following requirements must be met in the system design: Safety Considerations The QTS48T25120 converter features 2000 Volt DC isolation from input to output. The input-to-output resistance is greater than 10M. 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 QTS48T25120 converter has no internal fuse. The external fuse must be provided to protect the system from catastrophic failure as shown in Figure 2. The fuse with a rating not greater than 10A 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 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 QTS48T25120 converter to be considered as SELV (Safety Extra Low Voltage) or TNV-1, according to all IEC60950 MAY 31, 2005 revised to JUN 15, 2006 Page 5 of 8 * * * 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 The QTS48T25120 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 125C to ensure reliable long-term operation of the converter. Contact Power-One for the complete list of the derating criteria. The graph in figure 3 shows the maximum output current of the QTS48T25120 converter at different ambient temperatures under both natural and forced (transverse airflow direction, from pin 1 to pin 3) convection. For example, the QTS48T25120 operating at 48Vin, 70C can deliver up to 21A reliably with 200LFM forced air. www.power-one.com QTS48T25120 DC-DC Series Data Sheet 300-Watt Quarter-Brick Bus Converter THERMAL DERATING CURVE QTS48T25120-NDA0 Vin = 48V, Orientation : Vin- to Vin + 25 Data Rev: 01 Load Current (A) 20 15 NC (25 - 35 LFM) 10 100 LFM 200 LFM 5 300 LFM 400 LFM 0 25 40 55 70 85 Ambient Temperature (Deg C) Figure 3. Thermal Derating Curve Varying Airflow (Input Voltage Constant) MAY 31, 2005 revised to JUN 15, 2006 Page 6 of 8 www.power-one.com QTS48T25120 DC-DC Series Data Sheet 300-Watt Quarter-Brick Bus Converter QTS48T25120-NDA0 Data Rev: 01 25 Load Current (A) 20 15 10 200 LFM(Vin-=48V) 5 200 LFM(Vin=42V) 200LFM(Vin=53N) 0 25 40 55 70 85 Ambient Temperature (Deg C) Figure 5: Thermal Derating Curve Varying Input Voltage (Airflow Constant at 200 LFM 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. 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. MAY 31, 2005 revised to JUN 15, 2006 Page 7 of 8 www.power-one.com QTS48T25120 DC-DC Series Data Sheet 300-Watt Quarter-Brick Bus Converter Mechanical Drawing Ordering Information Options Suffixes to add to part number st Remote ON/OFF (1 digit of option extension) Overall Height (2nd digit of option extension) Pin Length (3rd digit of option extension) Positive- Standard, -P suffix Negative-Standard, -N suffix 0.400" - Standard add "D" suffix 0.500" - Add "C" suffix 0.18"- Standard, add "A" suffix 0.145"- Add "B" suffix 0.110"- Add "C" suffix th Paralleling Option (4 digit of option extension) RoHS RoHS lead solder exempt 1 RoHS compliant for all six substances 1 Standard add "0" suffix Paralleling add "P" suffix Extended Input Range (38 - 52 VDC) add "-S2" suffix 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, 0.400" height, 0.145 pin length, and Paralleling the resulting part number is QTS48T25120-NDBP MAY 31, 2005 revised to JUN 15, 2006 Page 8 of 8 www.power-one.com