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| Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) ALD12/18/20/25 Single Output 16th Brick: 60Watts The ALD12/18/20/25 series is Astec's latest 16th Brick industry standard offering. Operating from an input voltage range of 36V to 75V, the series provides 6 configured outputs from 1.2V all the way up to 5V. It delivers up to 25A max current for 1.8V and lower at impressive levels of efficiency. The series comes with industry standard features such as Input UVLO; non-latching OCP, OVP and OTP; Output Trim; Differential Remote Sense pins. With its wide operating temperature range of -40C to 85C ambient, the converters are deployable into almost any environment. Electrical Parameters Input Input Range Input Surge 36-75 VDC 100V / 100ms Control Enable TTL compatible (Positive or Negative Logic Enable Options) Output Special Features * * * * * * * * Industry Standard 16th Brick Footprint Low Ripple and Noise Output pre-bias startup Regulation to zero load High Capacitive Load Start-up Fixed Switching Frequency Industry standard features: Input UVLO; Enable; non-latching OVP, OCP and OTP; Output Trim, Differential Remote Sense Meets Basic Insulation Load Current Line/Load Regulation Ripple and Noise Adjust Range Transient Response Remote Sense Over Current Protection Over Voltage Protection Over Temperature Protection Up to 25A max (VO 1.8V) < 1% VO 40mVP-P typical 10% VO 3% Typical deviation 50% to 75% Load Change 80s settling time (Typ) +10%VO 120% max 130% max 110 C 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: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 1 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Electrical Specifications 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 Temperature Storage Temperature Operating Humidity Max Voltage at Enable Pin Max Output Power Device All Symbol VIN VIN, trans Min -0.3 1500 -40 -40 10 -0.6 Typ Max 75 100 85 125 85 25 60 60 50 45 38 30 Unit Vdc All All All All All A (5V0) F (3V3) G (2V5) Y (1V8) M (1V5) K (1V2) Ta TSTG - Vdc C C % Vdc W W W W W W INPUT SPECIFICATIONS Parameter Operating Input Voltage Range Input Under-Voltage Lock-out T_ON Threshold T_OFF Threshold Input Current1 (VIN = VIN, Min; IO = IO, Max) Device All All Symbol VIN Min 36 34.0 31.0 Typ 48 34.8 32.5 Max 75 36.0 33.5 2.4 2.4 1.9 1.6 1.4 1.1 4.1 3.9 3.4 3.4 3.4 2.6 10 1 Unit Vdc Vdc A Max Pdiss @ IO = 0A (VIN = VIN, Nom; TA 25C) Input Ripple Current2 5Hz to 20MHz Input Voltage Rise Time 10% to 90% of Vout Inrush Current 5V0 (A) 3V3 (F) 2V5 (G) 1V8 (Y) 1V5 (M) 1V2 (K) 5V0 (A) 3V3 (F) 2V5 (G) 1V8 (Y) 1V5 (M) 1V2 (K) All All All IIN-MAX - - W II1 - 1 - mAp-p V/ms A2/s I2/s - MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 2 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Electrical Specifications (continued) OUTPUT SPECIFICATIONS Parameter Output Voltage Set point VIN = VIN, MIN to VIN,MAX; IO =IO,Max Device 5V0 (A) 3V3 (F) 2V5 (G) 1V8 (Y) 1V5 (M) 1V2 (K) Max Symbol VO,SET Min 4.930 3.260 2.465 1.770 1.470 1.180 0 0 0 0 0 0 4 13.0 19.5 21.5 26.5 26.5 26.5 5.9 3.9 3.0 2.1 1.8 1.4 110 90.0 89.0 88.5 87.0 83.5 82.0 Typ 5.000 3.300 2.500 1.800 1.500 1.200 0.1 0.1 0.3 40 6.2 4.1 3.2 2.4 2.1 1.6 91.0 90.0 89.5 88.0 84.5 83.0 Max 5.070 3.340 2.535 1.830 1.530 1.220 0.4 0.4 0.8 100 12 18 20 25 25 25 10,000 19 25 30 34 34 34 6.9 4.9 3.9 2.9 2.5 2.1 120 94.0 93.0 92.0 90.0 88.0 86.0 Unit Vdc Vdc Vdc Vdc Vdc Vdc %Vo %Vo %Vo mVp-p A Output Regulation Line: VIN = VIN, Min to VIN, Load: IO = IO, Min to IO, Max All All All All 5V0 (A) 3V3 (F) 2V5 (G) 1V8 (Y) 1V5 (M) 1V2 (K) All 5V0 (A) 3V3 (F) 2V5 (G) 1V8 (Y) 1V5 (M) 1V2 (K) 5V0 (A) 3V3 (F) 2V5 (G) 1V8 (Y) 1V5 (M) 1V2 (K) All 5V0 (A) 3V3 (F) 2V5 (G) 1V8 (Y) 1V5 (M) 1V2 (K) IO Temperature: TA = -40 C to +85C Ripple and Noise3 Peak-to-Peak: (5Hz to 20MHz) Output Current External Load Capacitance Capacitor ESR Output Current-limit Inception VOUT = 90% VO,SET (Autorecovery) IO F m A Over Voltage Range (Autorecovery) V Over Temperature Range (AVG. PCB TEMP) - Auto recovery C % % % % % % Efficiency VIN = VIN-NOM IO = IO,MAX TA=25C MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 3 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Electrical Specifications (continued) OUTPUT SPECIFICATIONS (continued) Parameter Turn-On Response Time4 VIN = VIN-MIN to VIN-MAX Enable to Output Turn-ON Delay VIN = VIN-MIN to VIN-MAX IO = IO,MIN to IO,MAX +VIN to Output Turn-On Delay Enable Pin: Active VIN = VIN-MIN to VIN-MAX IO = IO,MIN to IO,MAX Switching Frequency Dynamic Response: CO = use Figure 2 test setup Peak Deviation for Load Step Change from IO = 50% to 75% of IO, Max : Settling Time to within 1% of output set point voltage - VO,SET: Peak Deviation for Load Step Change from IO = 50% to 25% of IO, Max : Settling Time to within 1% of output set point voltage - VO,SET: Output Overshoot at Turn-on Passive Resistive Full Load Output Enable ON/OFF Enable Signal Slew Rate Negative Enable ("N" suffix) Enable Pin Voltage: Mod-ON Mod-OFF Positive Enable (No suffix) Enable Pin voltage: Mod-ON Mod-OFF Output Voltage Remote Sensing Output Voltage Trim Range5 Device All All Symbol Min Typ 2 Max 5 10 Unit ms ms All - - - 10 ms All 2V5, 5V0 IO/t - 560 650 - 625 725 0.1 690 800 - KHz A/s All All All All Vo 1V8 Vo > 1V8 All N suffix - - 3 80 6 200 % Vo s % Vo s %Vo - 0.01 -0.5 2.95 2.95 -0.5 90 3 80 0 0 - 6 200 5 4 1.2 20 20 1.2 10 110 V/ms V V V %VO %VO No suffix - All All NOTES: 1. The converter is not internally fused; an external fuse must be used. 2. Refer to Figure 1 for the input reflected ripple test setup. 3. Refer to Figure 2 for the Output Ripple and Noise Test Measurement Setup. 4. Measure output rise time from 10%VO to 90%VO. 5. Refer to the output trim equations provided (Equations 1 and 2). MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 4 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Electrical Specifications (continued) SAFETY AGENCY / MATERIAL RATING / ISOLATION Parameter Safety Approval Material Flammability Rating Parameter Input to Output Capacitance Input to output Resistance Input to Output Insulation Type Device All All Device All All All UL/cUL 60950 TUV EN 60950 UL94V-0 Symbol Min - Typical 1000 10 Basic Max - Unit pF Mohms - 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(-) Measure input reflected-ripple current with a simulated source inductance (Ltest) of 12 uH. Capacitor Cs offsets possible battery 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 Use a 0.1F @50V X7R ceramic capacitor (connected an inch away from the output terminals of the UUT) and a 10F @ 25V tantalum capacitor (2 inches away from the output terminals of the UUT). Scope measurement should be made using a BNC socket, positioned 3 inches away from output terminals of the converter. Figure 2. Peak to Peak Output Noise Measurement Setup. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 5 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Basic Operation and Features INPUT UNDER VOLTAGE LOCKOUT To prevent any instability to the converter, which may affect the end system, the converter 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 31-33.5 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 (1a): 1.5V to 5V Radj_up = -Vin -Vout -Sense Enable Vadj Rload Radj_up +Sense +Vin +Vout 5.1 x Voset x ( 100 + %) 510 - - 10.2 % 1.225 x % Figure 3. External resistor configuration to increase the outputs Equation (1b): 1.2V Radj_up = 5.1 x Voset x ( 100 + %) 510 - - 10.2 % 0.6 x % 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. Equation (2): Radj_down -Vin -Vout -Sense Radj_down Enable Vadj +Sense +Vin +Vout Rload 510 - 10.2 k % Where: % = percent change in output voltage Figure 4. External resistor configuration to increase the outputs OUTPUT ENABLE The converter comes with an Enable pin (PIN 2), which is primarily used to turn ON/OFF the converter. Both a Positive (no "N" suffix required) and a Negative (suffix "N" required) Enable Logic options are being offered. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 6 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Basic Operation and Features (continued) OUTPUT ENABLE (continued) 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 circuit is non-latching - auto recovery mode. The converter will shut down and attempt to restart until the fault is removed. There is a 20-50ms lockout period between restart attempts. OVER CURRENT PROTECTION (OCP) The Over Current Protection is non-latching - auto recovery mode. The converter shuts down once the output current reaches the OCP range. The converter will attempt to restart until the fault is removed. There is a 20-50ms lockout period between restart attempts. Note that the OCP threshold will be reduced proportionally with the output voltage trim up and/or remote sense compensation. The percent rise in output voltage will be proportional to the reduction in OCP current inception. OVER TEMPERATURE PROTECTION (OTP) The Over Temperature Protection circuit will shutdown the converter once the average PCB temperature (See Figure 43A for OTP reference sense point) 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. REMOTE SENSE The remote 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 (-Vout) respectively at the point where regulation is desired. The combination of remote sense and trim adjust cannot exceed 110% of VO. When output voltage is trimmed up (through remote sensing and/or trim pin), output current must be derated and maximum output power must not be exceeded. TO SOURCE +Vin 33uF +Vo 0.1uF 10uF L O A D -Vin -Vo Figure 5. Typical Application Circuit MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 7 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Performance Curves 5V Version Efficiency vs. Output Current, TA=25C 95% Power Dissipation (Watts) 90% 85% Efficiency 80% 75% 70% 65% 60% 55% 0 2 4 6 8 Output Current (Amps) 10 12 Vin = 36Vdc Vin = 48Vdc Vin = 75Vdc Power Dissipation vs. Output Current, TA=25C 10 Vin = 36 Vdc 8 6 4 2 0 0 2 Vin = 48 Vdc Vin = 75 Vdc 4 6 8 Output Current (Amps) 10 12 Figure 6. 5V Efficiency vs. output current at various input line conditions, TA = 25C. Figure 7. 5V Power Dissipation vs. load current at various input line conditions, TA = 25C. Figure 8. 5V Startup Characteristic at VIN = 48Vdc, IO = Full Load, TA = 25C. Figure 9. 5V Output Ripple at VIN = 48Vdc, IO = Full Load, TA = 25C. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 8 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Performance Curves 5V Version (continued) ALD12A48 Current vs. Temperature 12 10 Output Current (A) 8 6 4 2 0 25 40 55 Temperature (C) 70 85 0 LFM 100LFM 200 LFM 300LFM 400 LFM Figure 10. 5V Output current vs. ambient temperature curves at VIN = 48Vdc. Figure 11. 5V Transient Response 50% to 75% step at VIN = 48Vdc, TA = 25C, di/dt = 0.1A/s, CO = 0. 3.3V Version Power Dissipation vs. Output Current, TA=25C 10 Power Dissipation (Watts) Vin = 36Vdc Efficiency vs. Output Current, TA=25C 95% 90% 85% Efficiency 80% 75% 70% 65% 60% 55% 0 3 6 9 12 Output Current (Amps) 15 18 Vin = 36Vdc Vin = 48Vdc Vin = 75Vdc 8 6 4 2 0 0 3 Vin = 48Vdc Vin = 75Vdc 6 9 12 Output Current (Amps) 15 18 Figure 12. 3.3V Efficiency vs. output current at various input line conditions, TA = 25C. Figure 13. 3.3V Power Dissipation vs. load current at various input line conditions, TA = 25C. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 9 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Performance Curves 3.3V Version (continued) Figure 14. 3.3V Startup Characteristic at VIN = 48Vdc, IO = Full Load, TA = 25C, CO = 0. Figure 15. 3.3V Output Ripple at VIN = 48Vdc, IO = Full Load, TA = 25C. ALD18F48 Current vs. Temperature 18 16 Output Current (A) 14 12 10 8 6 4 2 0 25 40 55 Temperature (C) 70 85 0LFM 1 00LFM 200LFM 300LFM 400LFM Figure 16. 3.3V Output current vs. ambient temperature curves at VIN = 48Vdc. Figure 17. 3.3V Transient Response 50% to 75% step at VIN = 48Vdc, TA = 25C, di/dt = 0.1A/s, CO = 0. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 10 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Performance Curves 2.5V Version Efficiency vs. Output Current, TA=25C 95% Power Dissipation (Watts) Power Dissipation vs. Output Current, TA=25C 10 Vin = 36 Vdc 90% 85% Efficiency 80% 75% 70% 65% 60% 55% 0 4 8 12 16 20 Output Current (Amps) Vin = 36Vdc Vin = 48Vdc Vin = 75Vdc 8 6 4 2 0 0 Vin = 48 Vdc Vin = 75 Vdc 5 10 15 20 Output Current (Amps) Figure 18. 2.5V Efficiency vs. output current at various input line conditions, TA = 25C. Figure 19. 2.5V Power Dissipation vs. load current at various input line conditions, TA = 25C. Figure 20. 2.5V Startup Characteristic at VIN = 36Vdc, IO = Full Load, TA = 25C, CO = 0. Figure 21. 2.5V Output Ripple at VIN = 48Vdc, IO = Full Load, TA = 25C. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 11 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Performance Curves 2.5V Version (continued) ALD20G48 Current vs. Tem perature 20 Output Current (A) 15 10 0 LFM 1 LFM 00 200 LFM 300 LFM 400 LFM 5 0 25 40 55 70 85 Ambient Tem perature (C) Figure 22. 2.5V Output current vs. ambient temperature curves at VIN = 48Vdc. Figure 23. 2.5V Transient Response 50% to 75% step at VIN = 48Vdc, TA = 25C, di/dt = 0.1A/s, CO = 0. 1.8V Version Efficiency vs. Output Current, TA=25C 95% Power Dissipation vs. Output Current, TA=25C 10 Power Dissipation (Watts) 8 Vin = 36 Vdc Vin = 48 Vdc Vin = 75 Vdc 90% 85% Efficiency 80% 75% 70% 65% 60% 55% 0 5 10 15 20 Output Current (Amps) 25 Vin = 36Vdc Vin = 48Vdc Vin = 75Vdc 6 4 2 0 0 5 10 15 20 Output Current (Amps) 25 Figure 24. 1.8V Efficiency vs. output current at various input line conditions, TA = 25C. Figure 25. 1.8V Power Dissipation vs. load current at various input line conditions, TA = 25C. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 12 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Performance Curves 1.8V Version Figure 26. 1.8V Startup Characteristic at VIN = 36Vdc, IO = Full Load, TA = 25C, CO = 0. Figure 27. 1.8V Output Ripple at VIN = 48Vdc, IO = Full Load, TA = 25C. ALD25Y48 Current vs. Temperature 25 Output Current (Amps) 20 15 10 5 0 25 40 55 Temperature (C) 70 85 0 LFM 1 LFM 00 200 LFM 300 FLM 400 FLM Figure 28. 1.8V Output current vs. ambient temperature curves at VIN = 48Vdc. Figure 29. 1.8V Transient Response 50% to 75% step at VIN = 48Vdc, TA = 25C, di/dt = 0.1A/s, CO = 0. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 13 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Performance Curves 1.5V Version Efficiency vs. Output Current, TA=25C 95% 90% 85% Efficiecny [%] 80% 75% 70% 65% 60% 55% 0 5 10 15 Output Current [A] 20 25 Vin = 36Vdc Vin = 48Vdc Vin = 75Vdc Pow er Dissipation vs. Output Current, T A=25C 10 Vin = 36Vdc Power Dissipation [W 8 6 Vin = 48Vdc Vin = 75Vdc 4 2 0 0 5 10 15 Output Current [A] 20 25 Figure 30. 1.5V Efficiency vs. output current at various input line conditions, TA = 25C. Figure 31. 1.5V Power dissipation vs. output current at various input line conditions, TA = 25C. Figure 32. 1.5V Startup Characteristic at VIN = 48V, TA = 25C. Figure 33. 1.5V Output Ripple at VIN = 48Vdc, IO = Full Load, TA = 25C. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 14 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Performance Curves 1.5V Version (continued) Output Current vs. Temperature 25 20 Current [A] 15 10 0 LFM (0 m/s) 1 LFM (0.5 m/s) 00 200 LFM (1m/s) 400 LFM (3 m/s) 5 0 25 40 55 70 Ambient Temperature [C] 85 Figure 34. 1.5V Output current vs. ambient temperature curves at VIN = 48Vdc. Figure 35. 1.5V Output Transient Response 50% to 75% step at VIN = 48Vdc, TA = 25C, di/dt = 0.1A/s, CO = 0. 1.2V Version Efficiency vs. Output Current, TA=25C 95% 90% 85% Efficiecny [%] 80% 75% 70% 65% 60% 55% 0 5 10 15 Output Current [A] 20 25 Vin = 36Vdc Vin = 48Vdc Vin = 75Vdc Power Dissipation vs. Output Curtret, TA=25C 10 Vin = 36Vdc Power Dissipation [W 8 6 Vin = 48Vdc Vin = 75Vdc 4 2 0 0 5 10 15 Output Current [A] 20 25 Figure 36. 1.2V Efficiency vs. output current at various input line voltage, TA = 25C. Figure 37. 1.2V Power dissipation vs. output current at various input line conditions, TA = 25C. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 15 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Performance Curves 1.2V Version (continued) Figure 38. 1.2V Startup Characteristic at VIN = 48V, TA = 25C. Figure 39. 1.2V Output Ripple at VIN = 48Vdc, IO = Full Load, TA = 25C. ALD25K48 Current vs. Tem perature 25 20 Output Current (A) 15 10 5 0 25 40 55 70 Am bient Tem perature (C) 85 0 LFM 1 LFM 00 200 LFM 300 LFM 400 LFM Figure 40. 1.2V Output current vs. ambient temperature VIN = 48V, TA = 25C. Figure 41. 1.2V Output Transient Response 50% to 75% step at VIN = 48Vdc, TA = 25C, di/dt = 0.1A/s, CO = 0. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 16 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Input Filter for FCC Class B Conducted Noise A reference design for an input filter that can provide FCC Class B conducted noise levels is shown below (See Figure 42). Two common mode connected inductors are used in the circuit along with balanced bypass capacitors to shunt common mode currents into the ground plane. Shunting noise current back to the converter reduces the amount of energy reaching the input LISN for measurement. The application circuit shown has an earth ground (frame ground) connected to the converter output (-) terminal. Such a configuration is common practice to accommodate safety agency requirements. Grounding an output terminal results in much higher conducted emissions as measured at the input LISN because a hard path for common mode current back to the LISN is created by the frame ground. "Floating" loads generally result in much lower measured emissions. The electrical equivalent of a floating load, for EMI measurement purposes, can be created by grounding the converter output (load) through a suitably sized inductor(s) while maintaining the necessary safety bonding. PARTS LIST CKT CODE FILTER Common Mode Choke X-Cap Y-Cap Cin DESCRIPTION CTX01-15091 Cooper Electronic Technologies 0.47 F X 4pcs 22 nF X 4 pcs 33 uF Figure 42: Class B Filter Circuit MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 17 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Mechanical Specifications Parameter Dimension Device All Symbol L W H Min 1.28 [32.5] 0.88 [22.35] 0.33 [8.38] +VIN ENABLE -VIN -VOUT Typ 1.30 [33.0] 0.90 [22.9] 0.35 [8.8] 14.17 [0.54] 5 6 7 8 Max 1.32 [33.5] 0.92 [23.36] 0.37 [9.39] -SENSE TRIM +SENSE +VOUT Unit in [ mm ] in [ mm ] in [ mm ] g [oz] Weight PIN ASSIGNMENT 1 2 3 4 All 1.30 [33.0] 0.137 [3.5] MIN ({ -6 O PTION} PIN LENGHT). 0.152 [3.9] MAX OTP Sense point Pin 8 Pin 1 0.90 [22.9] 0.189[4.8]MIN. (STD PIN LENGHT). 0.205 [5.2]MAX. 0.35 [8.8] PIN SIDE DOWN 0.19 [4.8] 0.04O [1.0O](6X) 0.062 O [1.57O] (2x) 0.10 [2.5] 1.10 [27.9] 0.10 [2.5] SIDE VIEW 0.15 [3.8] 0.15 [3.8] 0.30 [7.6] 0.45 [11.4] 0.60 [15.2] 0.15 [3.8] 0.30 [7.6] 0.60 [15.2] PIN SIDE UP Figure 43A. Mechanical Outline - Through hole termination MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 18 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) Mechanical Specifications (continued) 1.30 [33.0] Pin 1 0.90 [22.9] Pin 8 PIN SIDE DOWN 0.06 [1.4] 0.36 [9.0] 0.18 [4.6] SIDE VIEW 1.10 [27.9] 0.15 [3.8] 0.10 [2.5] 0.15 [3.8] 0.15 [3.8] 0.30 [7.6] 0.45 [11.4] 0.60 [15.2] 0.30 [7.6] 0.30 [7.6] PIN SIDE UP Figure 43B. Mechanical Outline - SMT (Solder Ball) Termination. SOLDERING CONSIDERATIONS The through hole terminated converters are compatible with standard wave soldering techniques. When wave soldering, the converter pins should be preheated for 20-30 sec at 110C and wave soldered at 260C for less than 10 sec. 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. For SMT terminated modules, refer to Figure 44 for the recommended reflow profile. RECOMMENDED REFLOW PROFILE 240 220 200 TEMPERATURE (deg C) 183C PEAK TEMPERATURE 200C - 230C REFLOW ZONE 180 160 140 120 100 80 60 40 20 0 0 30 60 90 120 150 180 210 240 270 300 110C < 80 sec PRE-HEAT ZONE 120 - 180 sec SLOPE < 4C /sec TIME (seconds) Figure 44. Recommended reflow profile for SMT modules. MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 19 OF 20 Technical Reference Notes ALD12/18/20/25 Series (Single Output 16th Brick) PART NUMBERING SCHEME CONSTRUCTION O/P CURRENT O/P VOLTAGE Vin Enable TH PIN LENGTH TERMINATION A W L = Open frame E = Baseplate D xx 12 = 12A 18 = 18A 20 = 20A 25 = 25A 25 = 25A 25 = 25A A F G Y M K = = = = = = y 5.0V 3.3V 2.5V 1.8V 1.5V 1.2V 48 N N = Negative Blank = Positive - 6 6 = 3.7mm Blank = 5mm default S S = SMT Termination (Consult with Factory) Blank = (TH) thru-hole Note: 1) For Through Hole termination: - Std pin length is 5mm nominal (min: 0.189 [4.8]; max: 0.205 [5.2] / in [mm]) - "-6" option is 3.7mm nominal (min: 0.137 [3.5]; max: 0.152 [3.9] / in [mm]) - Pins 4&8 diameter: = 0.062 [1.57], others: = 0.04 [1.0] (6X) 2) For SMT termination: - Recommended surface mount pad = 0.11 [2.79] 0.005 [0.13] (in [mm]) Please call 1-888-41-ASTEC for further inquiries or visit us at www.astecpower.com MODEL: ALD12/18/20/25 SERIES AUGUST 17, 2005 - REVISION C SHEET 20 OF 20 |
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