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| QLS30 Series - 30A Quarter-Brick DC/DC Converter 48V Input 1.8V, 1.5V, 1.2V Output Data Sheet Features * * * * * * * * * * * * * * * Cost-effective single board design Low profile - 11 mm height Input/output isolation: 1500VDC, basic insulation High efficiency Output back-drive protection Start-up into high capacitive load Low conducted and radiated EMI Output overcurrent protection Output overvoltage protection Overtemperature protection Remote sense Set point accuracy 1% Remote on/off (primary referenced), positive or negative logic Output voltage trim adjust, positive or negative UL 1950 Recognition, CSA 22.2 No. 950-95 certification, TUV IEC950 Applications * * * * Distributed power architectures Telecommunications equipment LAN/WAN applications Data processing applications Description The new QLS30 series of single-output DC/DC converters features single board, multi-layer construction and an SMT design that is highly reliable due to the low component count and minimal manufacturing touch time. The QLS30 series uses fewer components than any other equivalently rated single board converter. The converters can deliver a maximum of 30 Amps with a typical efficiency of 85%. The QLS provides superior thermal performance, with minimal derating. The QLS30ZB model converter can deliver 22.8 amperes at 1.8 volt output in ambient conditions of 65C and 200 LFM. This full featured, low profile converter offers input undervoltage lockout, overload, overvoltage and overtemperature protection. Interface features include remote on/off, remote sense and output voltage trim. Selection Chart Model Input voltage VDC 36-75 36-75 36-75 Input current, max ADC 1.5 1.3 1.1 Output voltage Vout, VDC 1.8 1.5 1.2 Output rated current I rated, ADC 30 30 30 Output Ripple/Noise, mV p-p 100 100 100 Typical Efficiency @ I rated, % 86 85 84 QLS30ZB QLS30ZA QLS30ZY This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment should be followed. REV. 10/1 Page 1 of 8 QLS30 Series - 30A Quarter-Brick DC/DC Converter 48V Input 1.8V, 1.5V, 1.2V Output Absolute Maximum Ratings Data Sheet Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect long-term reliability and cause permanent damage to the converter. Parameter Input voltage Operating Temperature Storage Temperature ON/OFF Control Voltage Conditions/Description Continuous Transient, 100mS At 100% load Referenced to -Vin Min Max 75 100 100 125 50 Units VDC VDC C C VDC -40 -40 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 Halfsine wave, 3 axes GR-63-Core, Section 5.A.2 Standard process Per Bellcore TR-NWT-000332 Min 50 1 Nom Max Units g Oz/g kHrs 1.2/35 Yes 1,980 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 1500 10 1800 Nom Basic Max Units VDC MOhm pF 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 Inrush Transient Conditions/Description Continuous Ramping Up Ramping Down To Output Regulation Band 100% Resistive Load Full Load, 12uH source inductance Vin=Vin.max Min 36 Nom 48 33 32 5 Max 75 Units VDC VDC VDC mS mA p-p A2s 10 50 0.1 REV. 10/1 Page 2 of 8 QLS30 Series - 30A Quarter-Brick DC/DC Converter 48V Input 1.8V, 1.5V, 1.2V Output Output Specifications Data Sheet All specifications apply over specified input voltage, output load and temperature range, unless otherwise noted. Parameter Output Voltage Setpoint Accuracy Output Current* Line Regulation Load Regulation Total output voltage regulation Remote Sense Headroom Dynamic Regulation Peak Deviation Settling Time Admissible Load Capacitance Output Current Limit Threshold** Switching Frequency Overvoltage Protection, Non Latching Trim Range Conditions/Description Vin=Vin.nom, Full Load See selection chart for Irated Vin.min to Vin.max, Irated Vin=Vin.nom, 10% to 100%Irated Over all input voltage, load, and temperature conditions 50-75% load step change to 1% error band Irated, Nom Vin Vout=0.97Vout.nom Over all input voltage and load conditions Irated, Vin=Vnom 6 500 20,000 110 300 120 90 140 110 140 %Vout S F %Irated kHz %Vout %Vout Min -1 10 Nom Max 1 100 0.2 0.2 2 0.5 Units %Vout %Irated %Vout %Vout %Vout VDC -2 * At Iout 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 Open Circuit Voltage Positive Logic Converter ON Open Circuit Voltage Converter OFF Source Current Overtemperature Protection Conditions/Description On/Off signal is low - converter is ON -1.0 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 -1.0 ON/OFF pin is connected to -Vin Average Board Temperature 105 2.0 2.5 2.1 1.8 150 5 50 5 1.8 1 VDC mADC VDC VDC VDC VDC VDC mADC C Min Nom Max Units REV. 10/1 Page 3 of 8 QLS30 Series - 30A Quarter-Brick DC/DC Converter 48V Input 1.8V, 1.5V, 1.2V Output Characteristic Curves 2.2 Data Sheet 95 Input Current, ADC 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 10 20 30 40 50 60 70 90 85 Efficiency, % 80 75 70 65 60 55 50 0 3 6 9 12 15 18 21 24 27 30 36V 48V 75V Input Voltage, VDC Output current, A Fig. 1 QLS30ZB Efficiency vs. Output Load Fig. 4 QLS30ZB Input Characteristic 1.8 90 80 75 70 65 60 55 50 0 3 6 9 12 15 18 21 24 27 30 36V 48V 75V Input current, ADC 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 10 20 30 40 50 60 70 Input voltage, VDC Efficiency, % 85 Output current, A Fig. 2 QLS30ZA Efficiency vs. Output Load 95 85 80 75 70 65 60 55 50 0 3 6 9 12 15 18 21 24 27 30 Output current, A 36V 48V 75V Fig. 5 QLS30ZA Input Characteristic 1.6 Input current, ADC 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 10 20 30 40 50 60 70 90 EFFICIENCY% Input voltage, VDC Fig. 3 QLS30ZY Efficiency vs. Output Load Fig. 6 QLS30ZY Input Characteristic REV. 10/01 Page 4 of 8 QLS30 Series - 30A Quarter-Brick DC/DC Converter 48V Input 1.8V, 1.5V, 1.2V Output Typical Application Figure 7 below shows the recommended connections for the QLS30 series converter. QLS30ZX Fuse +Vi +Vo +Sense C1 On/Off Trim -Sense -Vi -Vo C2 C3 Data Sheet 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. Note: If the ON/OFF pin is not used, it can be left floating (positive logic), or connected to the -Vin pin (negative logic). Fig.7 Typical application of QLS30 series The QLS30 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 QLS30 series. 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 to use 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. Output Voltage Trim The trim feature allows the user to adjust the output voltage from the nominal. This can be used to accommodate a different requirement or to do production margin testing. There are two variances available in the QLS30 series. Negative Trim (No suffix) The QLS30 negative trim 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 Fig.8. The negative trim schematic is shown in Figure 8. Shutdown Feature Description The ON/OFF pin in the QLS30 series converters functions as a normal soft shutdown. It is referenced to the -Vin pin (see Figure 7). With 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 REV. 10/01 Fig.8 QLS30 series negative trim schematic The general equation (1) for changing the output voltage on the negative trim modules is invariant, but the constants in the equation change due to different internal values. Page 5 of 8 QLS30 Series - 30A Quarter-Brick DC/DC Converter 48V Input 1.8V, 1.5V, 1.2V Output Data Sheet RTRIM = A - B x V , V k (1) 1 100 R DOWN = 5.11 - ,K 2V % 2 where V% is the output voltage change expressed in percents of the nominal output voltage, Vout. 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 QLS30 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. where A and B are constants from the table below, and V is the absolute value of the desired change in the output voltage in Volts. Model QLS30ZB QLS30ZA QLS30ZY Trim up A B 0.57 1 0.283 0.121 0.5928 3.01 Trim down A B 0.2711 1.4676 0.065 0.352 0.5686 2.0422 Inductrial Standard Positive Trim (suffix -T) The -T option 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 the Figure 9. Safety Considerations The QLS30 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 additional requirements may be needed for user's specific applications. The QLS30 series converters have no internal fuse. An external fuse must be provided to protect the system from catastrophic failure, as illustrated in Figure 7. The fuse with a rating of 4A or less 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 at the minimum input voltage. Both input traces and the Page 6 of 8 Fig.9 QLS30 series positive trim schematic The equations below determine the trim resistor value required to achieve a V change in the output voltage. Vout(100 + V %) 100 + 2V % RUP = 5.11 - ,k V % 1.225V % 100 RDOWN = 5.11 - 2 , k V % For QLS30ZY use the following equations. Vout(100 + V %) RUP = 5.11 ,K 1.225V % REV. 10/01 QLS30 Series - 30A Quarter-Brick DC/DC Converter 48V Input 1.8V, 1.5V, 1.2V Output 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 QLS30 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: * * 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. 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 QLS30 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. Data Sheet 11, the QLS30ZA operating at 55C can deliver up to 25A reliably with 100LFM forced air, while up to 29A reliably with 200LFM forced air. 35 30 Output Current (A) 25 20 15 10 5 0 100LFM 200LFM 300LFM 400LFM 25 30 35 40 45 50 55 60 65 70 75 80 85 0 Ambient Temperature (C) Fig.10 QLS30ZB (1.8V) derating curves 35 * 30 25 Output Current (A) 20 15 10 5 0 100LFM 200LFM 300LFM 400LFM 25 30 35 40 45 50 55 60 Ambient Temperature (C) 65 70 75 80 0 Fig.11 QLS30ZA (1.5V) derating curves Thermal Considerations The QLS30 series converters are designed for both natural and forced convection cooling. The maximum allowable output current of the converters is determined by meeting the derating criteria of all electronic components used in the power supplies. An example of the derating criteria for the semiconductor junction temperature is not to exceed 120C to provide reliable long-term operation of the converters. Please contact Power-One for more derating criteria for other components. The graphs in Figures 10-12 show the maximum output current of the QLS30 series converters at different ambient temperatures under both natural and forced (longitudinal airflow direction, from pin 1 to pin 3) convection. As an example, from Figure 35 30 25 Output Current (A) 20 0 15 10 5 100LF M 200LF 25 30 35 40 45 50 55 60 Ambient Temperature (C) 65 70 75 80 85 0 Fig.12 QLS30ZY (1.2V) derating curves . REV. 10/01 Page 7 of 8 QLS30 Series - 30A Quarter-Brick DC/DC Converter 48V Input 1.8V, 1.5V, 1.2V Output Mechanical Drawing Data Sheet PIN 1 2 3 4 5 6 7 8 FUNCTION -Vin On/Off +Vin -Vout -Sense Trim +Sense +Vout Tolerances: Pin Diameter .xx + .020 (.5) .xxx + .010 (.25) + 0.002 (.05) Ordering Information Options Remote ON/OFF Trim Pin Length Suffixes to add to part number Positive- Standard, no suffix required Negative- Add "N" suffix Negative- Standard, no suffix required Positive - Add "T" suffix 0.18"- Standard, no suffix required 0.11"- Add "8" suffix 0.15"- Add "9" suffix Notes 1. 2. 3. Consult factory for the complete list of available options. 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 President of Power-One, Inc. Specifications are subject to change without notice. REV. 10/01 Page 8 of 8 |
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