QHS DC-DC Series Data Sheet Features * * * * * * * * * * * Applications * * * * Low profile - 12.7 mm height Input/output isolation: 1500VDC, Basic insulation High efficiency - up to 92% at full load Start-up into high capacitive load Low conducted and radiated EMI Output overcurrent protection Output overvoltage protection Back drive protection Overtemperature protection Remote sense Remote on/off (primary referenced), positive or negative logic Output voltage trim adjust UL1950 recognition, CSA 22.2 No. 950-95 certification, TUV IEC950 Distributed power architectures Telecommunications equipment LAN/WAN Data processing * * Description The QHS is a series of high efficiency, high-density, single output dc-dc converters for onboard conversion of standard telecom and datacom input voltages into isolated low voltage outputs in a through-hole mounting package. The two-board construction provides a cool environment for control components and the integrated metallic substrate PCB provides superior thermal management for power components resulting in enhanced product reliability. A heat sink can be conveniently and effectively attached to the IMS base plate for operations in elevated ambient conditions or where airflow is minimal. Model Selection Model Input Voltage VDC Input Current, Max ADC QHS12ZH QHS25ZG QHS40ZE QHS40ZD QHS40ZB QHS50ZA QHS50ZY 36-75 36-75 36-75 36-75 36-75 36-75 36-75 4.5 4.3 4.5 3.3 2.5 2.7 2.3 Output Voltage Vout, VDC 12.0 5.0 3.3 2.5 1.8 1.5 1.2 Output Rated Current I rated, ADC 12 25 40 40 40 50 50 REV. JUN 04, 2004 Page 1 of 10 Output Ripple/Noise, mV p-p Typical Efficiency @ I rated, % 150 150 150 100 100 100 100 91 92 89 88 85 79 76 QHS DC-DC Series Data Sheet 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. Table 1. Absolute Maximum Ratings Parameter Input voltage Conditions/Description Continuous Transient Base Plate Temperature Operating Temperature Min Storage Temperature ON/OFF Control Voltage Units VDC VDC -40 Max 75 80 100 -40 125 C VDC Referenced to -Vin 20 C Environmental and Mechanical Specifications All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. Table 2. Environmental and Mechanical Specifications Parameter Shock Sinusoidal Vibration Weight Water Washing MTBF Conditions/Description Halfsine wave, 3 axes GR-63-Core, Section 5.4.2 Standard process Per Bellcore TR-NWT-000332 REV. JUN 04, 2004 Page 2 of 10 Min 50 1 Nom 1.2/35 Yes 1,980 Max Units g g Oz/g kHrs QHS DC-DC Series Data Sheet Isolation Specifications All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. Table 3. Isolation Specifications Parameter Insulation Safety Rating Isolation Voltage Isolation Voltage Isolation Resistance Isolation Capacitance Conditions/Description Min Input to output, input to base plate Output to base plate 1500 500 10 Nom Basic Max Units VDC VDC MOhm pF 1000 Input Specifications All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. Table 4. Input Specifications Parameter Input Voltage Conditions/Description Continuous Min 36 Turn-On Input Voltage Ramping Up 34 VDC Turn-Off Input Voltage Ramping Down 33 VDC Input over voltage protection Ramping up Turn-On Time To Output Regulation Band 76 Nom 48 Max 75 Units VDC 84 VDC 5 ms 100% Resistive Load Input Reflected Ripple Current Full Load, 12uH source inductance 60 mA p-p Inrush Transient Vin=Vin.max 0.1 As REV. JUN 04, 2004 Page 3 of 10 2 QHS DC-DC Series Data Sheet Output Specifications All specifications apply over specified input voltage, output load and temperature range, unless otherwise noted. Table 5. Output Specifications Parameter Output Voltage Setpoint Accuracy Conditions/Description Vin=Vin.nom, Full Load Min Nom Max Units 1.8V -1.67 1.67 %Vout 2.5V -2.00 2.00 %Vout 3.3V -1.5 1.5 %Vout 12V -2.0 2.0 %Vout 0 100 %Irated Output Current* See selection chart for Irated Line Regulation Vin.min to Vin.max, Irated 0.2 %Vout Load Regulation Vin=Vin.nom, 10% to 100%Irated 0.75 %Vout Total output voltage regulation Over all input voltage, load, and temperature conditions 3 %Vout 10% %Vout -3 Remote Sense Headroom*** Dynamic Regulation 50-75% load step change Peak Deviation Settling Time Admissible Load Capacitance to 1% error band 5 %Vout 250 s Irated, Nom Vin 27,000 F 12V 8,000 F 150 %Irated Output Current Limit Threshold** Vout0.97Vout.nom Switching Frequency 2.5V and 1.8V 300 kHz 3.3V 450 kHz 12V 400 kHz Overvoltage Protection, Non Latching Trim Range 110 Over all input voltage and load conditions 120 140 %Vout Irated, Vin=Vnom 90 110 %Vout * At Iout<Iout.min, the output may contain low frequency component that exceeds ripple specifications. ** Overcurrent protection is non-latching with auto recovery. *** Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources should not exceed 10% of Vout REV. JUN 04, 2004 Page 4 of 10 QHS DC-DC Series Data Sheet Feature Specifications All specifications apply over specified input voltage, output load and temperature range, unless otherwise noted. Table 6. Feature Specifications Parameter Shutdown (ON/OFF) Negative Logic Converter ON Source Current Converter OFF Open Circuit Voltage Positive Logic Converter ON Open Circuit Voltage Converter OFF Source Current Overtemperature Protection Conditions/Description Min Nom Max Units 1.8 1 20 5 VDC mADC VDC VDC 20 5 1.8 1 VDC VDC VDC mADC C On/Off signal is low - converter is ON -0.5 ON/OFF pin is connected to -Vin 3.5 ON/OFF pin is floating On/Off signal is low-converter is OFF 3.5 ON/OFF pin is floating -0.5 ON/OFF pin is connected to -Vin Average board temperature 105 95 95 90 90 85 85 EFFICIENCY % EFFICIENCY % Characteristic Curves 80 75 EFF.(35V) 70 EFF.(48V) 65 EFF.(75V) 60 80 75 EFF.(36V) 70 EFF.(48V) 65 EFF.(75V) 60 10 20 30 40 50 60 LOAD % 70 80 90 100 10 20 30 40 50 60 70 LOAD % 80 90 100 Figure 1. QHS12ZH Efficiency vs. Output Load Figure 3. QHS40ZD Efficiency vs. Output Load 95 90 85 85 EFFICIENCY % EFFICIENCY % 90 80 75 EFF.(36V) 70 EFF.(48V) 65 EFF.(75V) 80 75 EFF.(36V) 70 EFF.(48V) 65 EFF.(75V) 60 60 10 20 30 40 50 60 LOAD % 70 80 55 90 100 10 20 30 40 50 60 LOAD % 70 80 90 100 Figure 2. QHS40ZE Efficiency vs. Output Load Figure 4. QHS40ZB Efficiency vs. Output Load REV. JUN 04, 2004 Page 5 of 10 4 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 3.5 Input Current (A) Input Current (A) QHS DC-DC Series Data Sheet 3 2.5 2 1.5 1 0.5 0 0 0 10 20 30 40 50 Input Voltage (V) 60 10 70 20 30 40 50 Input Voltage (V) 60 70 Figure 7. QHS40ZD Input Characteristics Figure 5. QHS12ZH Input Characteristics 3 5 4.5 2.5 Input Current (A) Input Current (A) 4 3.5 3 2.5 2 1.5 1 2 1.5 1 0.5 0.5 0 0 0 10 20 30 40 50 Input Voltage (V) 60 0 70 Figure 6. QHS40ZE Input Characteristics 10 20 30 40 50 Input Voltage (V) 60 Figure 8. QHS40ZB Input Characteristics REV. JUN 04, 2004 Page 6 of 10 70 QHS DC-DC Series Data Sheet Typical Application Figure 9 shows the recommended connections for the QHS Series converter. QHS40ZX Note: If the ON/OFF pin is not used, it can be left floating (positive logic), or connected to the -Vin pin (negative logic). Fuse +Vi 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. +Vo +Sense C1 On/Off Trim C2 C3 Output Voltage Trim -Sense -Vi -Vo Industry Standard Trim Figure 9. Typical Application of the QHS Series The QHS Series converters do 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 33F electrolytic capacitor with the ESR<0.7 is recommended for the QHS Series. The units trim up with a resistor from the TRIM pin to the +Sense pin and trim down with a resistor from the TRIM pin to the -Sense pin as shown in Figure 10. 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 10F tantalum and a 1F ceramic capacitors connected directly across the output pins of the converter. Note, that the capacitors do not substitute the filtering required by the load. Figure 10. QHS Series Positive Trim Schematic Shutdown Feature Description The ON/OFF pin in the QHS Series converters functions as a normal soft shutdown. It is referenced to the -Vin pin (see Figure 7). 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. 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 REV. JUN 04, 2004 Page 7 of 10 The equations below determine the trim resistor value required to achieve a V change in the output voltage. 5.1Vo(100 + %) 510 Radj - up = - - 10.2) k 1.225% % 510 Radj - down = - 10.2) k % where V% is the output voltage change expressed in percents of the nominal output voltage, Vout. QHS DC-DC Series Data Sheet Notes: 1. When the output voltage is trimmed up, the output power from the converter must not exceed its maximum rating. The power is determined by measuring the output voltage on the output pins, and multiplying it by the output current. 2. In order to avoid creating apparent load regulation degradation, it is important that the trim resistors are connected directly to the remote sense pins, and not to the load or to traces going to the load. 3. The QHS Series converters will trim down further than the 10% limit. In general, this is permissible. The user must confirm that the results are acceptable in the application. * If the voltage source feeding the module is a Hazardous Voltage Secondary Circuit, the voltage source feeding the module must be provided with at least Basic insulation between the source to the converter and any hazardous voltages. The entire system, including the QHS converter, must pass a dielectric withstand test for Reinforced insulation. Design of this type of systems requires expert engineering and understanding of the overall safety requirements and should be performed by qualified personnel. Safety Considerations The QHS Series converters feature 1500 Volt DC isolation from input to output. The input to output resistance is greater than 10MOhm. These converters are provided with Basic 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 QHS Series converters have no internal fuse. The external fuse must be provided to protect the system from catastrophic failure as shown in Figure 7. The user can select a 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. Thermal Considerations The QHS Series converters are designed for natural or forced convection cooling. The maximum allowable output current of the converters is determined by meeting the derating criteria for all components used in the converters. For example, the maximum semiconductor junction temperature is not allowed to exceed 120C to ensure reliable long-term operation of the converters. Contact Power-One for the complete list of the derating criteria. The graphs in Figures 11-14 show the maximum output current of the QHS Series converters at different ambient temperatures under both natural and forced (longitudinal airflow direction, from pin 1 to pin 3) convection. For example, from Figure 11, the QHS40ZE operating at 55C can deliver up to 18A reliably with 100LFM forced air, while up to 25A reliably with 400LFM forced air. 12 * * If the voltage source feeding the module is SELV or TNV-2, 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. REV. JUN 04, 2004 Page 8 of 10 Output Current (A) 10 In order for the output of the QHS Series 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: 8 6 4 2 0 0 100LFM 200LFM 300LFM 400LFM 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) Figure 11. QHS12ZH (12V) Derating Curves 40 40 35 35 30 30 Output Current (A) Output Current (A) QHS DC-DC Series Data Sheet 25 20 15 0 100LFM 200LFM 300LFM 400LFM 10 5 Figure 14. QHS40ZB (1.8V) Derating Curves 35 Output Current (A) 0 100LFM 200LFM 300LFM 400LFM Ambient Temperature (C) 40 30 25 20 0 100LFM 200LFM 300LFM 400LFM 0 10 25 30 35 40 45 50 55 60 65 70 75 80 85 Figure 12. QHS40ZE (3.3V) Derating Curves 5 15 0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) 10 20 5 0 15 25 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) Figure 13. QHS40ZD (2.5V) Derating Curves REV. JUN 04, 2004 Page 9 of 10 QHS DC-DC Series Data Sheet Mechanical Drawing Figure 15. Mechanical Drawing Table 7. Pinout/Functions Pin 1 2 3 4 5 6 7 8 Mechanical Tolerances Inches X.XX 0.020 X.XXX 0.010 Millimeters X.X 0.5 X.XX 0.25 Pin 0.002 0.05 Function -Vin On/off +Vin -Vout -Sense Trim +Sense +Vout Ordering: Table 8. Ordering Information Options Remote ON/OFF Pin Length Suffixes to add to part number Positive- Standard, no suffix required Negative- Add "NT" suffix 0.18"- Standard, no suffix required 0.11"- Add "8" suffix 0.15"- Add "9" suffix Notes: Consult factory for the complete list of available options. NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not 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. REV. JUN 04, 2004 Page 10 of 10