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| Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) ALQ25 Single Output Open-Frame DC-DC Converter Module Industry Standard 1/4 Brick: 36V-75V Input / 5V Output The ALQ25 series is Astec's next generation single output, high-density standard quarter brick offering. It operates from a 36V to 75V DC Bus and comes in different Isolated Logic Output voltages (ILO) well suited for DPA applications. It's designed to conservatively handle 25A of output current for 5V and at high levels of efficiency (5V @ 91%). It provides tight regulation and exhibits clean and monotonic output start up characteristics. The ALQ25's come with industry standard features such as Input UVLO, OCP, OVP, OTP, Output Trim, differential output Sense pins. Electrical Parameters Input Input Range Input Surge Efficiency 36-75 VDC 100V / 100ms 91% (Typ) Control Enable TTL compatible (Positive and Negative Enable Options) Output Load Current Load Regulation Ripple and Noise Output Voltage Adjust Range Transient Response 5.0V @ 25A max Line Regulation 0.2 % Vo 0.4 % V O 150mVPK-PK max for 5V Special Features * * * * * * * * Industry Standard 1/4 Brick Footprint Positive and Negative Enable Options Regulation to Zero Load High Capacitive Load Start-up Fixed Switching Frequency at 200kHz Output Trim Input Under-Voltage Lockout Low profile / open-frame Remote Sense Over Current Protection 10% VO 5% VO deviation (Typ) 50% to 75% Load Change 400sec settling time (Typ) +10% VO 140% IO,MAX Environmental Specifications * * * -40C to 85C Operating Temperature (200LFM) -40C to 120C Storage Temperature MTBF > 1 million hours Safety UL + cUL 60950, Recognized (Pending) EN60950 through TUV-PS (Pending) MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 1 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) ALQ25 Series THIS SPECIFICATION COVERS THE REQUIREMENTS FOR A NEW 1/4-BRICK SIZE 25A SINGLE OUTPUT HIGH EFFICIENCY DC/DC CONVERTER. MODEL NAME ALQ25A48 ALQ25A48N ALQ25A48-7 ALQ25A48N-7 OPTIONS: Negative Enable: Positive Enable: 5.8mm pin option VOUT / IOUT CONSTRUCTION 5.0V/25A 5.0V/25A 5.0V/25A 5.0V/25A SUFFIX "N" No suffix -7 Serial No. Prefix B737 B742 C511 C514 MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 2 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) Electrical Specifications STANDARD TEST CONDITION on a single module unless otherwise specified. TA Airflow -VIN ENABLE +VIN -VOUT -Sense Trim +Sense +Vout PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 25C (Ambient Air) See derating curve 48V 2V Dependent on model series Return pin for +VIN Connected to Load (return) Connected to -VOUT Open Connected to +VOUT 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 (200LFM) Storage Temperature Operating Humidity Max Output Power Device All All All All All All A (5.0V) Symbol VIN VI N, trans Min 0 0 -40 -40 Typ Max 80 100 1500 +85 120 85 125 Unit Vdc Vdc Vdc C C % W TA TSTG PO MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 3 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) INPUT SPECIFICATION Parameter Operating Input Voltage Input Under-Voltage Lock-out T_ON Threshold T_OFF Threshold Maximum Input Current1 Conditions: VIN =VIN,min IO = IO,max; TA = 25 C Max PDISS @ IO = 0A (VIN = VIN,NOM) Input Reflected Ripple Current2 Conditions: PO = PO,max; TA = 25 C BW: 5Hz to 20MHz Note: Device All All 31 30 34 33 36 35 6 Vdc A Symbol VIN Min 36 Typ 48 Max 75 Unit VDC A (5.0V) IIN,max A (5.0V) - - 7.5 W All II1/ II2 - - 260 mA PK-PK 1. An input line fuse is recommended for use. 2. External input capacitance required. See Input Ripple Current test measurement setup on Fig 1. OUTPUT SPECIFICATIONS Parameter Output Voltage Set point VIN = VIN, min to VIN, max; IO =IO,Max Output Regulation Line: VIN = VIN, Min to VIN, Load: IO = IO, Min to IO, Max Device A (5.0V) Symbol VO,SET Min 4.9 Typ 5.0 Max 5.1 Unit Vdc Max A (5.0V) A (5.0V) - - 0.1 0.2 0.2 0.4 %Vo %Vo % / C mVp-p Temperature: Ta = -40 C to +85C Ripple and Noise3 Peak-to-Peak: (5Hz to 20MHz) Output Current4 External Load Capacitance Output Current-limit Inception VOUT = 90% VO,SET A (5V) - - - 0.02 150 A (5V) A (5V) A (5V) IO IO 0 470 27.5 - 25 8000 35 A F A MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 4 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) OUTPUT SPECIFICATIONS Parameter Over Voltage Protection Range Device A (5.0V) Symbol Min 6 Typ Max 7 Unit V Over Temperature Range (AVG PCB TEMPERATURE) All A (5.0V) 110 89 91 120 20 C % Efficiency VIN = VIN-NOM; IO = IO,MAX TA =25C Turn-On Response Time VIN = VIN-MIN to VIN-MAX Switching Frequency Dynamic Response5 : IO /t=0.1A / uS All All - - 200 ms KHz - 0.1 - A/s mV s Load Change from IO = 10% to 100% of IO, Max: Peak Deviation Settling Time to VO, Nom 5V - - 500 250 Load Change from IO = 50% to 25% of IO, Max: Peak Deviation Settling Time to VO, Nom Output Overshoot at T-on / T-off Passive Resistive Full Load Note: 5V All - - 250 400 - mV s %Vo 5 3. See Figure 2 for Ripple and Noise test measurement setup. 4. Appropriate Thermal Derating applies. See Figure 13 for the Thermal Derating Curves 5. The Dynamic Deviation and Recovery time are defined as below MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 5 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) FEATURE SPECIFICATION Parameter Output Enable ON/OFF10 Negative Enable ("N" suffix) Enable Pin voltage for Module ON Module OFF Positive Enable (No suffix) Enable Pin voltage for Module ON Module OFF Output Voltage Remote Sensing11,13 Output Voltage Trim Range Note: 12,13 Device N suffix Symbol - Min -0.7 3.5 Typ - Max 1.2 12 Unit V V No suffix All All - 3.5 -0.7 90 - 12 1.2 10 110 V % VO % VO 10. See Basic Operation and feature section for the recommended/ appropriate Module Enable configuration. 11. The sense pins can be used to compensate for any voltage drops (per indicated max limits) that may occur along the connection between the output pins to the load. Pin 7 (+Sense) and Pin 5 (-Sense) should be connected to Pin 8 (+Vout) and Pin 4 (Return) respectively at the point where regulation is desired. 12. Refer to Equation (1) and (2) and Figures 3 and 4 for the Output Trim Adjust configuration. 13. The combination of remote sense and Trim adjust cannot exceed 110% of VO, NOM. ISOLATION SPECIFICATION Parameter Isolation Capacitance Isolation Resistance Device All All Symbol Min 10 Typ 1000 1000 Max Unit pF M SAFETY APPROVAL The ALQ25 series have been certified through: * UL + cUL 60950, Third Edition - Recognized * EN 60950 through TUV-PS * Basic Insulation MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 6 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) TO OSCILLOSCOPE Ltest 12 uH BATTERY Cs 220 uF ESR < 0.1 OHM @ 20 C, 100 kHz 33 uF ESR < 0.7 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(+) 1 uF Vo(-) 10 uF SCOPE RESISTIVE LOAD Note: Use a 1F 50V X7R ceramic capacitor and a 10F 25V tantalum cap. Scope measurement should be made using a BNC probe socket positioned about 76mm (3 in.) away from the module's output terminals. The ext. capacitors should be placed between the BNC socket and the module's output terminals, with a minimum distance of 51mm (2in.) from the latter. Figure 2. Peak to Peak Output Noise Measurement Setup. MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 7 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) F1 +VIN Vin +VOUT +SENSE CNT1 Cin S1 TRM -SENSE -VIN -VOUT Co1 Co2 LOAD Figure 3. Setup for Parametric Test. F1: Fuse*: Use external fuse (fast blow type 10A) for each unit. Cin: Recommended input capacitor 100uF/100V high frequency low ESR electrolytic type capacitor .(NICHICON KME serial OR equate.) Co1: Recommended 1uF /25V ceramic capacitor Co2: Recommended output capacitor 1000uF/ 10V high frequency low ESR electrolytic type capacitor. (NICHICON LXV serial OR equate.) MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 8 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) Basic Operation and Features INPUT UNDER VOLTAGE LOCKOUT To prevent any instability to the converter, which may affect the end system, the ALQ25 series have been designed to turn-on once VIN is in the voltage range of 34 - 36 VDC. Likewise, it has also been programmed to turn-off when VIN drops down to 33 - 35 VDC. OUTPUT VOLTAGE ADJUST/TRIM The converter comes with a TRIM pin (PIN 6), which is used to adjust the output by as much as 90% to 110% of its set point. This is achieved by connecting an external resistor as described below. To INCREASE the output, external Radj_up resistor should be connected between TRIM PIN (Pin6) and +SENSE PIN (Pin 7). Please refer to Equation (1) for the required external resistance and output adjust relationship. Equation (1): 5 .1 x V o x (100 + %) 510 - - 10 .2 ( K) 1. 225 x % % -Vin -Vout -Sense ENABLE Trim Rload Radj_up +Sense +Vin +Vout R adj- up = Figure 3. External resistor configuration to increase the outputs To DECREASE the output, external Radj_down resistor should be connected between TRIM PIN (Pin 6) and -SENSE PIN (Pin 5). Please refer to Equation (2) for the required external resistance and output adjust relationship. -Vin -Vout -Sense Radj_down ENABLE Trim +Sense +Vin +Vout Rload R adj- down = 510 - 10 .2 ( K ) % Figure 4. External resistor configuration to decrease the outputs MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 9 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) OUTPUT ENABLE The ALQ25 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. OUTPUT OVER VOLTAGE PROTECTION (OVP) The Over-Voltage Protection consists of circuitry that monitors the voltage on the output terminals. If the output voltage exceeds the Over Voltage Protection threshold limit, module will work on intermittent model. When the Over Voltage condition is removed, the module will automatically restart. The protection mechanism is such that the unit can continue in this condition until the fault is cleared. 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. The Over Current Protection (OCP) circuit comes in foldback current limit. If output current exceed the OCP threshold limit, or at a short circuit condition, the module will work on intermittent model. When the Over Current condition is removed, the module will automatically restart. OVER TEMPERATURE PROTECTION (OTP) These modules feature an over-temperature protection circuit to safeguard against thermal damage. The module will work on intermittent mode when the maximum device reference temperature is exceeded. When the over-temperature condition is removed, the converter will automatically restart MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 10 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) Performance Curves ALQ25A48 (5.0V) SERIES Efficiency vs. Load Curve 100 90 80 70 Efficiency [%] Min Max Ave Efficiency (%) 60 50 40 30 20 10 0 10% 20 10 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 10% 100 90 80 70 60 50 40 30 Efficiency vs. Load Curve Min Max Ave 20% 30% 40% 50% 60% 70% 80% 90% 100% Load [A] Load (A) Figure 5. Efficiency vs. Load Current Curves at TA =25C for 36Vin Figure 6. Efficciency vs Load Current Curves at TA =25C For 48Vin Efficiency vs. Load Curve 100 90 80 70 Efficiency (%) 60 50 40 30 20 10 0 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Min Max Ave Load (A) Figure 7. Figure 6. Efficciency vs Load Current Curves at TA =25C for 75Vin MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 11 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) CURRENT VS. TEMPERATURE CURVES Derating curve of ALQ25A48. ALQ25A48 36v DERATING CURVE 25.0 OUTPUT CURRENT (A) 20.0 000 LFM 15.0 10.0 5.0 0.0 25 40 55 Temperature (C) 70 85 100 LFM 200 LFM 300LFM 400 LFM ALQ25A48 48v DERATING CURVE 25.0 OUTPUT CURRENT (A) 20.0 000 LFM 100 LFM 200 LFM 300 LFM 400 LFM 15.0 10.0 5.0 0.0 25 40 55 Temperature (C) 70 85 MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 12 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) ALQ25A48 75v DERATING CURVE 25.0 OUTPUT CURRENT (A) 20.0 15.0 10.0 5.0 0.0 25 40 55 Temperature (C) 70 85 000 LFM 100 LFM 200 LFM 300 LFM 400 LFM MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 13 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) Mechanical Specifications Figure 15. ALQ25 Series Mechanical Outline Drawing Parameter Dimension Device All Symbol L W H Min - Typ 2.28 [57.9] 1.45 [36.8] 0.43 [9.70] Max - Unit in [ mm ] in [ mm ] in [ mm ] g [oz] Weight PIN ASSIGNMENT J1 J2 J3 J4 -VIN ENABLE +VIN -VO J5 J6 J7 J8 -SENSE TRIM +SENSE +VO MODEL: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 14 OF 15 Technical Reference Notes ALQ25 Series (Open Frame Single Output Quarter Brick) Mechanical Specifications (continued) SOLDERING CONSIDERATIONS The ALQ25 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 CURRENT OUTPUT VOLTAGE INPUT VOLTAGE ENABLE LOGIC ALQ25 x A = 5.0V 48 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: ALQ25 SERIES Dec 1, 2003 - REVISION B SHEET 15 OF 15 |
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