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| Technical Reference Notes ALQ25B50 Bus Converter DC Transformer The ALQ25B50 is among a series of Bus Converter solutions from Astec intended to drive multiple non-isolated POLs employed on Distributed Power Architectures (DPA). It's a DC transformer that accepts a narrow input range (48V nominal) to ensure a stepped down output of 12V nominal with 10% line regulation. Such a DC conversion scheme allows the converters to exhibit a purely resistive output characteristic that eases stability management when driving multiple POLs. It comes with ON/OFF Enable pin, Input over voltage and under voltage protection, OTP and output pin length options. ALQ25B50 Single Output Open-Frame DC Bus Converter Industry Standard 1/4 Brick: 300W DC Transformer PRELIMINARY Electrical Parameters Input Input Range Efficiency OVP 42-53 VDC 12V up to 96% Efficiency 60Vdc Control Enable TTL compatible (Positive and Negative Enable Options) Output Load Current Line Regulation Load Regulation Ripple and Noise 0A - 25A max 10.25V - 13.6V 3%Vo (Typical) 80mV (Typical) Special Features * * * * * * * * 300W DC Transformer for DPA Front End Industry Standard 1/4 Brick Footprint High Efficiency Positive and Negative Enable Options Regulation to Zero Load Meets Basic Insulation Input OVP and UVLO Low profile / open-frame Environmental Specifications * * * -40C to 85C Operating Temperature -40C to 125C Storage Temperature MTBF > 1 million hours Safety UL + cUL 60950, Recognized EN60950 through TUV-PS MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 1 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer ALQ25B50 Series MODEL NUMBER ALQ25B50 ALQ25B50-6 ALQ25B50N ALQ25B50N-6 CONSTRUCTION Open Frame; Low profile; Pos Enable; 5mm Pin Length Open Frame; Low profile; Pos Enable; 3.7mm Pin length Open Frame; Low profile; Neg Enable; 5mm Pin length Open Frame; Low profile; Neg Enable; 3.7mm Pin Length Vin range 42V - 53V 42V - 53V 42V - 53V 42V - 53V Vout/Iout 12V / 25A 12V / 25A 12V / 25A 12V / 25A OPTIONS: Negative Enable: Positive Enable: 3.7mm nominal Pin Length 5mm nominal Pin Length SUFFIX "N" No suffix "-6" suffix No suffix MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 2 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer Electrical Specifications STANDARD TEST CONDITION on a single module unless otherwise specified. TA Airflow +VIN Enable -VIN -VOUT + Vout PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 25C (Ambient Air) 400LFM Connected to +Input Dependent on model series Connected to -Input Connected to Load return Connected to Load ABSOLUTE MAXIMUM RATINGS Stresses in excess of the absolute maximum ratings can cause permanent damage to the converter. Functional operation of the device is converter is not implied at these or any other conditions in excess of those given in the operational section of the specs. Exposure to absolute maximum ratings for extended period can adversely affect device reliability. Parameter Input Voltage1 Continuous Transient (100ms) Isolation Voltage Input to Output Operating Ambient Temperature Storage Temperature Operating Humidity Maximum Enable Voltage Max Output Power2 Note: Device All All All All All All All All Symbol VIN VI N, trans Min 42 -40 -55 Typ Max 56 60 2000 85 125 85 5.5 300 Unit Vdc Vdc Vdc C C % Vdc W TA TSTG PO 1. The module is not internally fused. Type 3AB Littlefuse rated at 10A, 250V or equivalent is recommended. 2. Output Derating applies. See Figure 9. MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 3 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer Electrical Specifications (continued) INPUT SPECIFICATION Parameter Operating Input Voltage Input Under-Voltage Lock-out T_ON Threshold T_OFF Threshold Input Over Voltage Shutdown Protection3 Maximum Input Current1 Conditions: VIN =VIN, MIN IO = IO, MAX; TA = 25 C Maximum Input Current IO = 0A Input Reflected Ripple Current4 Conditions: PO = PO, MAX; TA = 25 C BW: 5Hz to 20MHz Device All All Symbol VIN Min 42 41 39 IIN,max Typ 48 60 Max 53 43 41 6.6 Unit VDC Vdc Vdc A All All All All II1/ II2 5 0.17 - A mARMS OUTPUT SPECIFICATIONS Parameter Output Voltage Set point VIN = VIN, NOM; IO =IO,MIN Output Regulation Ta=25 C Line: VIN = VIN, MIN to VIN, MAX IO=IO, MIN = 0A Load: IO = IO, MIN to IO, MAX VIN=VIN, NOM = 48V Temperature: Ta = 0 C to +85 C Ripple and Noise5 Peak-to-Peak: (5Hz to 20MHz) TA = 25C, IO = IO, MAX VIN=VIN, NOM = 48V Other conditions Output Current2 External Load Capacitance Capacitor ESR Output Current-limit Inception6 VOUT = 90% VO, SET Over Temperature Range7 (Average PCM Temperature) Device All Symbol VO,SET Min 11.85 Typ 12.00 Max 12.15 Unit Vdc All All All - 10.25 - - 13.60 5.5 7.5 Vdc %VO %VO All All All All All All All IO IO 0 26.5 110 80 115 800 130 200 25 2,000 40 120 820 mVp-p mVp-p A F m A C KHz Switching Frequency - 780 MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 4 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer Electrical Specifications (continued) OUTPUT SPECIFICATIONS Parameter Device Symbol Min Typ Max Unit Efficiency All 94 96 % VIN = VIN-MIN to VIN-MAX IO = 13.5A Resistive load TA = 25C Turn-On Response Time from Active Enable to All 4.0 ms 90% VO (TA = 25C) Output Overshoot at T-on / T-off All 200 mV Ta=25C Passive Resistive Full Load Note: 3. The modules will shutdown once the input voltage OVP threshold is attained. Restart is possible once the fault is removed and the input voltage is cycled. 4. See Figure 1 for the Input Reflected Ripple Current test measurement setup. 5. See Figure 2 for the Output Ripple test measurement setup. 6. In an event of an over current condition - the output will be in shutdown mode to prevent excessive heating that could eventually damage the converter. Restart is possible once the input voltage or Enable is cycle for a 10 second wait period. 7. Output of the module will be terminated once the average PCB temp reaches the OTP range. Normal operation resumes once the temperature falls below the OTP range. FEATURE SPECIFICATION Parameter Output Enable ON/OFF Negative Enable ("N" suffix) Enable Pin voltage for Module ON Module OFF Positive Enable (No suffix) Enable Pin voltage for Module ON Module OFF Device Symbol Min Typ Max Unit N suffix No suffix - 0 2.00 2.00 0 - 0.8 5.0 5.0 0.8 V V V SAFETY APPROVAL The ALQ25B50 series have been certified through: * UL + cUL 60950, Third Edition - Recognized * EN 60950 through TUV-PS * Basic Insulation * UL94V-0 flammability rating MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 5 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer Electrical Specifications (continued) TO OSCILLOSCOPE Ltest 12 uH BATTERY Cs 220 uF ESR < 0.1 OHM @ 20 C, 100 kHz 33 uF 220uF ESR < 0.7 OHM ESR < 0.1 OHM @ 20 C, 100 kHz Vi(+) Vi(-) Note: Measure the input reflected ripple current with a simulated source inductance (Ltest) of 12uH. Capacitor Cs offsets possible battery/ source impedance. Measure current as shown above. Figure 1. Input Reflected Ripple Current Measurement Setup. COPPER STRIP Vo(+) 0.1 uF Vo(-) 10 uF SCOPE RESISTIVE LOAD Note: Use a 0.1F 50V X7R ceramic capacitor and a 10F 25V tantalum cap. Scope measurement should be made using a BNC probe socket. Position the load between 51 mm and 76 mm (2 in. and 3 in.) from module the latter. Figure 2. Peak to Peak Output Noise Measurement Setup. MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 6 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer Basic Operation and Features INPUT UNDER VOLTAGE LOCKOUT To prevent any instability to the converter, which may affect the end system, the ALQ25B50 series have been designed to turnon once VIN is in the voltage range of 41-43 VDC. Likewise, it has also been programmed to turn-off when VIN drops down to 39-41 VDC. INPUT OVER VOLTAGE PROTECTION The ALQ25B50 employs a DC Transformer conversion scheme where the input and output relationship is dictated by the turns ratio of the windings. The OVP circuit senses the input line and shuts down the entire module once the sensed voltage reaches the OVP threshold. Restart is possible once the fault is removed and the input power is recycled. OUTPUT ENABLE The ALQ25B50 series comes with an Enable pin (PIN 2), which is primarily used to turn ON/OFF the converter. Both a Positive (no part number suffix required) and a Negative (suffix "N" required) Enable Logic options are being offered. Please refer to Table 2 for the Part Numbering Scheme. For Positive Enable, the converter is turned on when the Enable pin is at logic HIGH or left open. The unit turns off when the Enable pin is at logic LOW or directly connected to -VIN. On the other hand, the Negative Enable version turns unit on when the Enable pin is at logic LOW or directly connected to -VIN. The unit turns off when the Enable pin is at Logic HIGH. OVER CURRENT PROTECTION (OCP) The Over Current Protection circuit comes in latching mode. The converter is latched off if the load current on the output reaches the OCP threshold limit. The OCP latch can be reset either by cycling the input voltage or toggling the Enable signal for 100ms. Consult factory for Auto-restart option. OVER TEMPERATURE PROTECTION (OTP) The Over Temperature Protection circuit will shutdown the converter once the average PCB temperature reaches the OTP range. This feature prevents the unit from overheating and consequently going into thermal runaway, which may further damage the converter and the end system. Such overheating may be an effect of operation outside the given power thermal derating conditions. Restart is possible once the temperature of the sensed location drops to less than 110C. MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 7 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer Performance Curves Efficiency Curves Efficiency vs. Output Load, TA = 25C 98% 96% 94% Efficiency [%] 92% 90% 88% 86% 84% 82% 80% 0 5 10 15 Output Current [A] 20 25 42V 48V 53V Power Dissipation at TA=25C 16 14 Dissipation [W] 12 10 8 6 4 2 0 0 5 10 15 Output Current [A] 20 25 42Vin 48Vin 53Vin Figure 3. Efficiency vs. Output current at TA = 25C with 400LFM airflow directed across pin 3 to 1. Figure 4. Power dissipation curves at TA = 25C with 400LFM airflow directed across pin 3 to 1. Efficiency vs. Output Load, TA=70C 98% 96% 94% Efficiency [%] 92% 90% 88% 86% 84% 82% 80% 0 5 10 15 Output Current [A] 20 25 42Vin 48Vin 53Vin Dissipation [W] 18 16 14 12 10 8 6 4 2 0 0 Power Dissipation at TA=70C 42Vin 48Vin 53Vin 5 10 15 Output Current [A] 20 25 Figure 5. Efficiency vs. Output current at TA = 70C with 400LFM airflow directed across pin 3 to 1. Figure 6. Efficiency vs. Output current at TA=70C with 400LFM airflow directed across pin 3 to 1. MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 8 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer Performance Curves Load Regulation, VIN = 48V, TA = 25C 12.50 12.40 12.30 12.20 12.10 12.00 11.90 11.80 11.70 11.60 11.50 11.40 11.30 11.20 11.10 11.00 0 5 10 15 Output Current [A] 20 25 14.75 14.00 Output Voltage [V] 13.25 12.50 11.75 11.00 10.25 9.50 42 43 44 45 46 47 48 49 50 Input Voltage [V] 51 52 53 Line Regulation, IO = IO,MAX, TA = 25C Figure 7. Load Regulation at VIN = VIN, NOM = 48Vdc, TA = 25C with 400LFM airflow directed across pin 3 to 1. Output Voltage [V] Figure 8. Line Regulation at IO = IO, MAX = 25A, TA = 25C with 400LFM airflow directed across pin 3 to 1. Output Derating Curves 25 20 15 10 0 LFM (0 m/ s) Output Current [A] 5 0 25 100 LFM (0.5m/ s) 200 LFM (1 m/ s) 400 LFM (2 m/s) 40 55 70 Ambient Temperature [C] 85 Figure 9. Output Derating curves at VIN = 48Vdc with 400LFM airflow directed across pin 3 to 1. MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 9 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer Mechanical Specifications Parameter Dimension Device All Symbol L W H Min +VIN ENABLE -VIN 4 5 Typ 2.30 [58.42] 1.45 [36.83] 0.40 [10.16] 49.9 [1.76] - VO + VO Max Unit in [ mm ] in [ mm ] in [ mm ] gm [oz] Weight PIN ASSIGNMENT 1 2 3 0.22 [5.5] 2.30 [58.4] 0.38 [9.6] 0.06 O[1.5O] 1 1.48 [37.6] 5 0.04O [1.0O] 2 3 4 PIN SIDE DOWN 0.15 [3.8] 2.00 [50.8] 0.44 [11.2] SIDE VIEW 0.44 [11.2] 0.74 [18.9] 1.04 [26.5] 0.60 [15.2] PIN SIDE UP Figure 10. ALQ25B50 Series Mechanical Outline Drawing MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 10 OF 11 Technical Reference Notes ALQ25B50 Bus Converter DC Transformer Mechanical Specifications (continued) SOLDERING CONSIDERATIONS The ALQ25B50 series converters are compatible with standard wave soldering techniques. When wave soldering, the converter pins should be preheated for 20-30 seconds at 110C and wave soldered at 260C for less than 10 seconds. When hand soldering, the iron temperature should be maintained at 425C and applied to the converter pins for less than 5 seconds. Longer exposure can cause internal damage to the converter. Cleaning can be performed with cleaning solvent IPA or with water. PART NUMBERING SCHEME FOR ORDERING OUTPUT VOLTAGE ENABLE LOGIC ALQ25 x B = 12V 50 y N = Negative Enable "Blank" = Positive Enable (Default) Please call 1-888-41-ASTEC for further inquiries or visit us at www.astecpower.com MODEL: ALQ25B50 SERIES SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY) SHEET 11 OF 11 |
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