AEH60F48

Technical Reference Notes Hercules (AEH/ALH60) Open Frame or HS Adapted AEH60F48 /ALH60F48 Isolated DC/DC Converter Module Industry Standard ½ Brick – 36-75V Input, 3.3V / 60A Output The AEH60F48 / ALH60F48 is part of Astec’s New Ultra High Density ½ Brick family capable of running 60Amps at 3.3V output. With Efficiencies up to 92% typical at 3.3V - 60Amps, this product provides a 1% to 2% performance increase in efficiency over the leading 60Amp competitors and up to 10% higher output current. The operating temperature range (40°C to 85°C for the ALH; -40°C to 100°C baseplate for AEH) assures maximum application flexibility. New singleoutput models feature superior transient response with excellent stability in high capacitance/low ESR load applications. This family has an effective thermal adapter plate which allows for heat sinking under particularly harsh conditions. Without the adapter plate (ALH60) provides a very effective low profile which performs extremely well in convection cooled applications. Electrical Parameters Input Input range Input Surge Efficiency 36-75 VDC 100V / 100ms 91%@3.3V (Typical @ 60 Amps) Control Enable TTL compatible (Positive & Negative enable options) Industry Standard ½ Brick Package Output Regulation (Line, Load, Temp) Ripple and Noise 1 million hours Safety § § UL, cUL 60950 Recognized EN 60950 through TUV-PS • • MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 1 OF 21 Technical Reference Notes (AEH60/ALH60F48) AEH60 / ALH60 SERIES THIS SPECIFICATION COVERS THE REQUIREMENTS FOR AN INDUSTRY STANDARD HALF BRICK (MAX 198W @ 3.3V) SINGLE OUTPUT ULTRA HIGH EFFICIENCY ISOLATED DCDC CONVERTER MODEL NAME / SIS CODE AEH60F48 AEH60G48 AEH60Y48 AEH60K48 ALH60F48 ALH60G48 ALH60Y48 ALH60K48 Options: Negative Enable: Positive Enable: Construction HS Adapter HS Adapter HS Adapter HS Adapter Open Frame 0.4” Open Frame 0.4” Open Frame 0.4” Open Frame 0.4” Vout, Iout 3.3V/60A 2.5V/60A 1.8V/60A 1.2V/60A 3.3V/60A 2.5V/60A 1.8V/60A 1.2V/60A Suffix "N" no suffix MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 2 OF 21 Technical Reference Notes (AEH60/ALH60F48) Electrical Specifications STANDARD TEST CONDITION on a single unit, unless otherwise specified. TA: +VIN: -VIN: Enable: +VOUT: -VOUT: Trim (VADJ): +Sense: -Sense: 25°C (Ambient Air) 48V ± 2% Return pin for +VIN Open (Positive Enable) Connect to Load Connect to Load (return) Open Connect to +VOUT Connect to -VOUT ABSOLUTE MAXIMUM RATINGS Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the specs. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Parameter Input Voltage: Continuous: Transient (100ms) Operating Temperature Storage Temperature Operating Humidity I/O Isolation (Conditions : 50µA for 5 sec, slew rate of 1500V/10sec) Input-Output Input-Case Output-Case Output Power All AEH AEH 3.3V PO,max 1500 1500 1500 198 Vdc Vdc Vdc W Device All All AEH ALH All All Symbol VI VI, trans TC TA TSTG Min 0 0 -40 -40 -55 Typ Max 75 100 100 85 125 85 Unit Vdc Vdc ºC °C ºC % MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 3 OF 21 Technical Reference Notes (AEH60/ALH60F48) Electrical Specifications (continued) INPUT SPECIFICATIONS Parameter Operating Input Voltage Maximum Input Current1 (VIN = 0 to VIN,max: IO = IO,max) Input Reflected-ripple Current 2 (5Hz to 20MHz: 12uH source impedance: TA = 25 ºC.) No Load Input Power (VIN = VIN,nom ) Note: Device All F (3.3V) All Symbol VIN IIN,max II Min 36 Typ 48 Max 75 7.2 15 Unit VDC A mAPK-PK All - - - 5 W 1. The power module is not internally fused. An input line fuse must always be used. 2. See Figure 1 for the Input Reflected-Ripple Current Test Setup. OUTPUT SPECIFICATIONS Parameter Output Voltage Setpoint (VIN = VIN,min to VIN,max at IO = IO,max ; TA = 25 ºC ) Output Regulation: Line Load (IO = IO,min to IO,max) Temp (AEH: -40 ºC to 100ºC) (ALH: -40°C to 85°C) Output Ripple and Noise3 Peak-to-Peak (5 Hz to 20 MHz) VIN = 36V, 48V VIN = 75V External Load Capacitance (See Stability Curves for Detail) Rated Output Current Output Current-limit Inception (when unit is shut down) Efficiency4 (VI = VIN,nom ; IO,max ; TA = 25°C) Switching Frequency Note: Device 3.3V Symbol VO,SET Min 3.24 Typ 3.3 Max 3.34 Unit Vdc All All All - - 0.1 0.1 - 0.4 0.4 1.0 % % %Vo 3.3V All All All 3.3V All Io Io - 0 63 90 180 66 91 195 100 150 50,000 60 77 210 mVPK-PK mVPK-PK µF A A % KHz 3. See Figure 2 for the Output Ripple Test Setup 4. Refer to Figures 5 and 6 for the Efficiency Curves MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 4 OF 21 Technical Reference Notes (AEH60/ALH60F48) Electrical Specifications (continued) OUTPUT SPECIFICATIONS Parameter Dynamic Response5 : (∆IO/∆t = 1A/10µs ; VI = VIN,nom ; TA = 25°C) Load Change from IO = 50% to 75% of IO,max : Peak Deviation Settling Time (to VO,nom) Load Change from IO = 50% to 25% of IO,max : Peak Deviation Settling Time (to VO,nom) Turn-On Time (IO = IO,max ; Vo within 1%) Device Symbol Min Typ Max Unit All - - 4 0 150 300 150 300 10 4 mV µsec mV µsec msec %Vo All - All All - Output Voltage Overshoot (IO = IO,max ; TA = 25°C) Note: 5. Refer to the Transient characteristics on Figures 7 and 8. FEATURE SPECIFICATIONS Parameter Enable Pin Voltage : Logic Low Logic High Enable Pin Current : Logic Low Logic High (ILEAKAGE at 10V) Module Output Voltage @ Logic Hi Module Output voltage @ Logic Low Output Voltage Adjustment Range6 Output Overvoltage Clamp Undervoltage Lockout Turn-on Point Turn-off Point Isolation Capacitance Isolation Resistance Calculated MTBF (IO = IO,max ; TA = 25°C) Note: Device All All All All AEH/ALH60x48N AEH/ALH60X48 Symbol Min -0.7 2.95 - Typ 4.10 34.8 33.5 2700 TBD Max 1.2 10 1.0 50 0.2 0.2 110 5.00 35.5 34.5 - Unit V V mA µA V V %Vo V V V PF MΩ Hours All 3.3V All All All All All VO,CLAMP - 90 3.90 34.0 33.0 10 - 6. For Output Voltage Adjustment setup, refer to Figures 3 and 4. SHEET 5 OF 21 MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 Technical Reference Notes (AEH60/ALH60F48) SAFETY APPROVAL The series have been certified through: • UL, cUL 60950 (Recognized) • EN 60950 through TUV- PS TO OSCILLOSCOPE Ltest 12 uH BATTERY Cs 220 uF ESR < 0.1 OHM @ 20 ºC, 100 kHz 33 uF ESR < 0.7 OHM @ 20 ºC, 100 kHz Vi(+) Vi(-) Note: Measure the input reflected-ripple current with a simulated source inductance (LTEST) of 12uH. Capacitor CS offsets possible battery impedance. Measure current as shown above. Figure 1. Input Reflected -Ripple Test Setup COPPER STRIP Vo(+) 0.1 uF Vo(-) 10 uF SCOPE RESISTIVE LOAD Note: Use a 0.1µF @50V X7R ceramic capacitor and a 10µF @ 25V tantalum capacitor. Scope measurement should be made using a BNC socket. Position the load between 51 mm and 76 mm (2 in. and 3 in.) from module. Figure 2. Peak to Peak Output Noise and Ripple Test Measurement Setup MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 6 OF 21 Technical Reference Notes (AEH60/ALH60F48) Basic Operation and Features AEH60 / ALH60 converters were designed specifically to address applications where ultra high power density is required. These modules provide basic insulation and 1500V isolation with very high output current capability in an industry standard half size module. Operating from 36 to 75V input, they have standard features such as remote sense, trim, OVP, OCP and OTP. AEH60 series devices will accept industry standard heat sinks to enhance thermal performance in applications with conductive cooling. Remote Sense (+Sense, -Sense) Connect the + Sense and – Sense pins close to the load to allow the module to compensate for the voltage drop across conductors carrying high load current. If remote sense is not required (for example if the load is close to the module) the sense pins should be connected to the corresponding output pins. Maximum voltage drop compensation is 10% Vout. It is important to avoid introducing lumped inductance or capacitance into the remote path. Do not connect remote sense lines “beyond” any external output filter stages used with the module. Trim Function Output voltage adjustment is accomplished by connecting an external resistor between the Trim Pin and either the +Sense or –Sense Pins. To adjust Vo to a higher value, please refer to Figure 3. An external resistor, Radj_up should be connected between the Trim Pin and the +Sense Pin. From Equation (1), Radj_up resistor can be determined for the required output voltage increment. Equation (1) Radj_up = Vo*(100 + %Vo,adj) 1.225*%Vo,adj 100+ 2%Vo,adj %Vo,adj kohm where: Radj_up - in kΩ %Vo, adj - percent change in output voltage Figure 3. Radj_up Setup to increase Output Voltage To adjust Vo to a lower value, please refer to Figure 4. An external resistor, Radj_down should be connected between the Trim Pin and the -Sense Pin. From Equation (2), Radj_down resistor can be determined for the required output voltage change. Equation (2) Radj_down 100 %Vo, adj 2 . kohm Figure 4. Radj_down Setup to decrease Output Voltage where: Radj_down - in kΩ %Vo, adj - percent change in output voltage MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 7 OF 21 Technical Reference Notes Hercules (AEH/ALH60) Open Frame or HS Adapted Basic Operation and Features (continued) Output Over Voltage Protection The output over voltage system consists of a separate control loop, independent of the primary feedback path. This control loop has a higher voltage set point than the main circuit. In a fault condition, the converter latches which ensures that the output voltage does not exceed VO,CLAMP,max. The converter will operate back normally once the fault is removed and the input voltage is cycled or the enable pin is toggled. Output Over Current Protection To provide protection in an output overload or short circuit condition, the converter is equipped with current limiting circuitry and can endure fault conditions for an unlimited duration. At the point of current-limit inception, the converter latches, causing the output current to be limited both in peak and duration. The converter will operate back normally once the overload/ fault is removed and the input voltage is cycled or the enable pin is toggled. Enable Function Two enable options are available. Positive Logic Enable (no suffix required in part number) and Negative Logic Enable (suffix “N”). Positive Logic Enable turns the converter on during a logic-high voltage on the enable pin, and off during a logic-low. Negative Logic Enable turns the converter off during a logic-high and on during a logic-low. MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 8 OF 21 Technical Reference Notes (AEH60/ALH60F48) Performance Curves EFFICIENCY 3V3 Efficiency VS Load Current @ Tc = 25 deg C 95% 90% 3V3 Efficiency VS Load Current @ Tc = 70 deg C 95% 90% EFFICIENCY [%] 85% 80% 75% 70% 65% 60% 55% 60 EFFICIENCY [%] 85% 80% 75% 70% 65% 60% 55% 0 10 20 30 40 LOAD CURRENT [Amp] 50 Vin = 36Vdc Vin = 48Vdc Vin = 75Vdc Vin = 36Vdc Vin = 48Vdc Vin = 75Vdc 0 10 20 30 40 LOAD CURRENT [Amp] 50 60 Figure 5. AEH/ALH60 3V3 Efficiency Curve at TC = 25°C Figure 6. AEH/ALH60 3V3 Efficiency Curve at TC = 70°C TRANSIENT RESPONSE Figure 7. 3V3 output: 50% to 75% load change with no external capacitor at 0.1A/uS slew rate (CH1 at 1A/10mV). Figure 8: 3V3 output: 50% to 75% load change with 10,000uF external capacitor at 0.1A/uS slew rate (CH1 at 1A/10mV). MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 9 OF 21 Technical Reference Notes (AEH60/ALH60F48) Performance Curves (continued) CURRENT VS TEMPERATURE CURVES 3V3 ALH (Open Frame) Load Current VS. Temperature 60 LOAD CURRENT[Amp] 50 40 30 20 10 0 25 30 35 40 45 50 55 60 65 70 75 80 85 AMBIENT TEMPERATURE (ºC) Nat. Conv. 0.5 m/s (100 ft/min) 1.0 m/s (200 ft/min) 2.0 m/s (400 ft/min) Figure 9. Load Current VS. Temperature (Open Frame) 3V3 AEH (baseplate) Load Current VS. Temperature 60 LOAD CURRENT [Amp] 50 40 30 20 10 0 25 30 35 40 45 50 55 60 65 70 75 80 85 AMBIENT TEMPERATURE (ºC) Nat. Conv. 0.5 m/s (100 ft/min) 1.0 m/s (200 ft/min) 2.0 m/s (400 ft/min) Figure 10. Load Current VS. Temperature (Baseplate) MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 10 OF 21 Technical Reference Notes (AEH60/ALH60F48) Performance Curves (continued) STARTUP CHARACTERISTICS Figure 11. AEH60F48 (3.3V): O/P startup characteristic with no external capacitor at Vin = 48V / 20A resistive load Figure 12. AEH60F48 (3.3V): O/P startup characteristic with 9400 uF external capacitor at Vin = 48V / 20A resistive load. MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 11 OF 21 Technical Reference Notes (AEH60/ALH60F48) 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 13). 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. Also shown is a sketch of a PCB layout used to achieve Class B conducted noise levels (See Figure 14). It is important to avoid extending the ground plane or any other conductors under the inductors (particularly L2) because capacitive coupling to that track or plane can effectively bypass the inductor and degrade high frequency performance of the filter. PARTS LIST CIRCUIT CODE L1, L2 C1, C3, C4, C5, C6, C11, C12 C2, C7, C9 C13, C14 C8, C10 DESCRIPTION Pulse Engineering P0353 / 590uH 0.01uF / 2000V 100uF / 100V Aluminum 470pF / 100V Ceramic 2.2uF / 100V Film C13 + Vin C3 L1A + C1 C2 L1B + C7 C8 L2B C5 L2A + C9 C10 C11 + Vout + 48 VDC INPUT CONVERTER - - Vin C4 C14 C6 C12 - Vout Figure 13: Class B Filter Circuit MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 12 OF 21 Technical Reference Notes (AEH60/ALH60F48) Input Filter for FCC Class B Conducted Noise (continued) GND PLANE C11 C13 C3 C5 + Vin 1 3 L2 A/B C9 C10 +48 VDC C1 C2 1 3 L1 A/B C7 C8 48 V Return C4 2 4 C6 C14 2 4 C O N V E R T E R TOP VIEW - Vin C12 GND PLANE Figure 14: Recommended PCB Layout for Class B Filter Input Noise Spectrum FCC Part 15 & CISPR 22 A & B Limits - conducted noise 90 80 70 60 50 40 30 20 10 0 2.E+04 5.E+04 1.E+05 3.E+05 7.E+05 2.E+06 4.E+06 9.E+06 2.E+07 A VERAGE L IMITS LISN Voltage db/uv Frequency (Hz) Figure 15: AEH60F48 and ALH60F48 Noise Spectrum MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 13 OF 21 Technical Reference Notes (AEH60/ALH60F48) Thermal Considerations While the ALH60 (Open Frame Converter) is designed to provide the maximum performance at the lowest profile, the AEH60 (Power Converter with HS adapter) operates in a variety of thermal environments. Sufficient cooling should be provided to help ensure reliable operation of either device. Heat generating components are thermally coupled to the adapter where heat energy is removed by conduction, convection, and radiation to the surrounding environment. Heat sinks can provide enhanced output performance as shown below. Proper cooling can be verified by measuring the case temperature (Center of adapter plate/baseplate). HEAT TRANSFER CHARACTERISTICS Increasing airflow over the converter enhances heat transfer via convection. Figure 16 shows worse case maximum power that can be dissipated by the converter, without exceeding the maximum adapter plate temperature, versus local ambient temperature (TA) for natural convection through 2.0 m/s (400 ft/min). Figure 17 shows actual maximum power that can be dissipated through both the adapter plate and through the output pins (unit soldered into a 4” square copper plane (2 Oz.) or equivalent). AEH60 Series Power Dissipation vs Temp Forced Convection without HS 30 Power Dissipation (Watts) Nat. Conv. 25 1.0 m/s (200 ft/min) 1.5 m/s (300 ft/min) 2.0 m/s (400 ft/min) 20 15 10 5 0 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Ambient Temperature (ºC) Figure 16. Forced Convection Power Dissipation Note: This is worse case dissipation - additional Heat transfer through O/P pins will increase allowable dissipation considerably. See Figure 17. MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 14 OF 21 Technical Reference Notes (AEH60/ALH60F48) Thermal Considerations (continued) AEH60 Series Actual Power Dissipation vs Temp Forced Convection without HS 30 25 20 15 10 5 0 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Power Dissipation [W] Nat. Conv. 1.0 m/s (200 ft/min) 1.5 m/s (300 ft/min) 2.0 m/s (400 ft/min) Ambient Temperature (ºC) Figure 17. Actual Measured Forced Convection Power Dissipation Note: This is an actual measured maximum dissipation with heat transfer through output pins included. Power Dissipation vs Output Current Tc = 25 Deg Celsius 25.0 Power Dissipation [W] 20.0 15.0 10.0 5.0 0.0 0 10 20 30 40 50 60 Vin = 36 Vdc Vin = 48 Vdc Vin = 75 Vdc Output Current [Amps] Figure 18. ALH/AEH60F48 Power Dissipation VS. Load Current. MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 15 OF 21 Technical Reference Notes (AEH60/ALH60F48) Thermal Considerations (continued) HEATSINK SELECTION ILLUSTRATED Figure 19 shows Case-to-Ambient Thermal Resistance, θ (°C/W), for AEH / ALH60 modules. These curves can be used to predict which heat sink will be needed for a particular environment. As an illustration, let's refer to below application requirement: An application requires 45 Amps of 3.3V in a 55 °C environment with airflow of 1.0 m/s (200 ft/min); the minimum heat sink required can be determined through Equation (3). Equation (3) where: θ ≤ (TC, MAX – TA) / PD θ TC, MAX TA PD = = = = Module’s Total Thermal Resistance Case Temperature (100 °C) Ambient Temperature (55 °C) Power Dissipation (15W) From Figure 18, the power dissipation for a 45A-load requirement can be determined (PD = 15W). Through Equation (3), the Thermal Resistance can be calculated to be at θ ≤ 3.0 °C/W. Based on Figure 19, the ¼" HS (heatsink), or greater, will be able to handle the required 45A-load at 55 °C environment and with 1.0 m/s (200 ft/min) airflow. AEH60 Series Case to Ambient Thermal Resistance Curves 7 Thermal Resistance RCA ( C/W) 6 5 4 3 2 1 0 0 100 200 300 Airflow [ ft / min] 400 500 600 No HS 1/4" HS 1/2" HS 1" HS O Figure 19. Case-to-Ambient Thermal Resistance vs. Air Velocity MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 16 OF 21 Technical Reference Notes (AEH60/ALH60F48) Stability: Figures 20 and 21 are plots of internal Module Loop Gain and Phase Shift vs Frequency. Curves for typical resistive and reactive loads are shown. System stability (Phase and Gain Margins) when the module is connected to other loads can be determined from the Young's Stability Curves on Figures 23 and 24. Figure 22 shows an operating zone in which phase margin can be determined for virtually any load resistance and shunt capacitance. See Ref. 1 for application of curves. 60 50 LOOP GAIN vs FREQUENCY 200 LOOP PHASE SHIFT vs FREQUENCY 30 GAIN db 20 10 0 10 20 30 40 100 3 4 1 .10 1 .10 FREQUENCY Hz 5 1 .10 PHASE SHIFT deg 40 150 100 50 0 50 100 1 .10 1 .10 FREQUENCY Hz 3 4 1 .10 5 Figure 20. Loop Gain VS. Frequency at 0.171Ω load with no output capacitance, Figure 21. Phase Shift VS. Frequency at 0.171Ω load with 9400uF cap load (3.9mΩ ESR) 100 PHASE MARGIN vs LOAD RES 90 PHASE MARGIN deg 80 No Output Capacitance 70 60 50 0.01 9.4K uF, 3.9 mohms 0.1 LOAD RESISTANCE ohms 1 Figure 22: Phase Margin vs Load Resistance MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 17 OF 21 Technical Reference Notes (AEH60/ALH60F48) Young’s Stability Curves PHASE MARGIN YSC IMPEDANCE MAGNITUDE in OHMS 1 Impedance Magnitude ( Ohms ) 0.1 0.01 1 .10 3 100 50 1 .10 3 1 .10 4 1 .10 5 _______15° _______30° _______45° _______60° _______75° _______90° 0 Impedance Phase Angle ( Degrees ) 50 100 150 100 1 .10 3 1 .10 Frequency 4 1 .10 5 Figure 23. Young’s Stability Curve – Phase Margin MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 18 OF 21 Technical Reference Notes (AEH60/ALH60F48) Young’s Stability Curves GAIN MARGIN YSC GAIN MARGIN 1 0.1 0.01 gain 3 1 . 10 4 1 . 10 5 1 . 10 6 1 . 10 100 3 1 . 10 4 1 . 10 5 1 . 10 ______10db ______20db ______30db ______40db ______50db 50 0 50 Phase 100 150 200 100 3 1 . 10 4 1 . 10 5 1 . 10 Frequency Figure 24. Young’s Stability Curve – Gain Margin MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 19 OF 21 Technical Reference Notes (AEH60/ALH60F48) Mechanical Specifications Parameter Dimension Device AEH/ALH AEH/ALH AEH ALH AEH ALH Symbol L W H H Min Typ 2.40 [60.96] 2.30 [58.42] 0.50 [12.70] 0.40 [10.16] 130 [4.60] 110 [3.90] Max Unit in [mm] in [mm] in [mm] in [mm] g [oz] g [oz] Weight PIN ASSIGNMENT + VIN 1 Enable ON/OFF 2 Case (AEH version) 3 - VIN 4 - Output 5 Note: 6 7 8 9 - Sense Trim + Sense + Output Nominal diameter for Pins 5 & 9 = 0.08", remaining pins at 0.04" OUTLINE DRAWING Figure 25. AEH60 - baseplate outline drawing (bottom view) MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 20 OF 21 Technical Reference Notes (AEH60/ALH60F48) Mechanical Specifications (continued) OUTLINE DRAWING Figure 26. ALH60 - open-frame outline drawing (bottom view) SOLDERING CONSIDERATIONS The AEH/ALH series converters are compatible with standard wave soldering techniques. When wave soldering, the converter pins should be preheated for 20–30 seconds at 110 °C and wave soldered at 260 °C for less than 10 seconds. When hand soldering, the iron temperature should be maintained at 425°C 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 NUMBER CODING SCHEME FOR ORDERING A x H60 x y z y 48 z Construction E: Enhanced thermals; Heatsink adapted L: Low profile; Open Frame Output Voltage F = 3.3V Y = 1.8V G = 2.5V K = 1.2V Option N : Negative Enable No Suffix : Positive Enable Please call 1-888-41-ASTEC for further inquiries or visit us at www.astecpower.com MODEL: AEH/ALH60F48 SEPTEMBER 26, 2002 - REVISION 02 SHEET 21 OF 21