PD - 94539 ASA28XXS SERIES 28V Input, Single Output ADVANCED ANALOG HIGH RELIABILITY HYBRID DC/DC CONVERTERS Description The ASA28XXS Series of DC/DC converters are high reliability thick film hybrid converters that use flyback topology operating at a nominal frequency of 550Khz. High input to output isolation is achieved through the use of transformers in the flyback power and feedback circuits. The advanced feedback design provides fast loop response for superior line and load transient characteristics and offers greater reliability than devices incorporating optical feedback circuits. This device is designed to meet MIL-STD-704D input requirements offering full performance over a 16 to 40 volt input range. Output Power of up to 5 watts is available. Connecting the inhibit pin (pin 5) to the input common (pin 7) will cause the converter to shut down. It is recommended that the inhibit pin be driven by an open collector device capable of sinking at least 400µA. The open circuit voltage of the inhibit pin is 11.5 ±0.5 volts. These converters are manufactured in a facility fully qualified to MIL-PRF-38534. All processes used to manufacture these converters have been qualified thereby enabling Advanced Analog to deliver fully compliant devices. Three standard temperature grades are offered with the screening options. Refer to Screening Level section. The CH grade converters are fully compliant to MIL-PRF-38534 for class H. The HB grade converters are processed with the same screening as the CH grade, but do not have class H element evaluation as required by MIL-PRF-38534. These two grades are fully tested and operate over the full military temperature range without derating of output power. A commercial grade is also available. Variations in electrical, mechanical and screening requirements can be accommodated. Extensive computer simulation using www.irf.com ASA Features n n n n n n n n n n n n Up To 5 Watt Output Power 5, 12,15 Volt Outputs High Reliability Wide Input Voltage Range -16 To 40 Volts Indefinite Short Circuit and Overload Protection Popular Industry Standard Pin-Out Military Screening Available Parallel Seam Welded Package No External Capacitors Required Input Voltage Surge Protected to MIL-STD-704A Under Voltage Lockout Available as Standard Military Drawing complex modeling allows design modifications to be examined. Contact Advanced Analog with specific requirements. 1 09/11/02 ASA28XXS Series Specifications ABSOLUTE MAXIMUM RATINGS Input Voltage Power Output Soldering Temperature Range Conditions -55° ≤ TC ≤+125°C VIN = 28V dc ±5% CL = 0 unless otherwise specified TEST Output voltage Output current -0.5 V to 50 V Continuous. 80 V, 100 mSec Internally limited (6.5 W typical) 300°C for 10 Sec. Operating -55°C to +125°C Case Storage -65°C to +150°C IOUT = 0 1 2 Output ripple voltage Line regulation Load regulation ASA2812S/xx ASA2815S/xx Min Max Min Max Min Max 1 4.95 5.05 11.88 12.12 14.85 15.15 2, 3 4.90 5.10 11.76 12.24 14.70 15.30 2 Efficiency 1, 2, 3 1000 417 333 mA 1 190 200 200 mV PP 2, 3 475 290 290 VIN = 16, 28, and 40 V dc IOUT = 0, 50%, 100% IMAX 1 25 ±25 ±25 2, 3 50 ±50 ±50 VIN = 16, 28, and 40 V dc IOUT = 0, 50%, 100% IMAX 1 25 ±25 ±25 2, 3 50 ±50 ±50 IOUT = IMAX 1, 2, 3 1, 2, 3 1 IOUT = IMAX 18 18 18 50 50 50 100 100 100 66 2, 3 Isolation - Input to output or any pin to case 3, 4 Capacitive load Power dissipation, load fault Switching frequency 4 Output response to step transient load changes VTEST 500 Vdc, Tc= +25°C 1 No effect on dc performance, Tc = +25°C 4 Overload 5 100 1, 2, 3 Short circuit IOUT = IMAX ½ IMAX ó IMAX 71 71 68 68 100 100 200 200 4.0 4.0 4.0 2.0 2.0 2.0 500 600 4 -300 +300 5, 6 -450 +450 0 mA ó IMAX 4 -500 +500 5, 6 -750 +700 500 600 500 600 -450 +450 -400 +450 -750 +750 -800 +750 µf W KHz mV pk 100 100 µS 1 1 ms 4, 5, 6 500 1000 1000 mV pk Input step 16 ó 40 V dc IOUT = IMAX 4, 5, 6 800 800 800 µS IOUT = 0 mA, IMAX 4, 5, 6 600 600 600 mV pk IOUT = 0 or IMAX 4, 5, 6 20 25 25 ms 4, 5, 6 20 25 25 ms Output response transient step line 4 8 changes Input step 16 ó 40 V dc IOUT = IMAX Recovery time transient 4, 7, 8 step line changes Turn on overshoot Load fault recovery mA PP 1 4, 5, 6 Turn on delay mA 200 IOUT = IMAX 0 mA ó ½ IMAX 9 mV MΩ 500 4, 5, 6 mV % 6 Recovery time, step transient load changes V VIN = 16, 28 and 40 V dc IOUT = 0 Pin5 open Input ripple current Unit VIN = 16, 28, and 40 V dc IOUT = 0 Pin 5 to Pin 7 Input current ASA2805S/xx Group A Subgroups 4 For Notes to Specifications, refer to page 3 2 www.irf.com ASA28XXS Series Notes to Specifications 1. 2. 3. 4. 5. 6. 7. 8. 9. Parameter guaranteed and measured during line and load regulation tests. Bandwidth guaranteed by design. Tested for 20 kHz to 2 MHz. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn-on. Parameter shall be tested as part of design characterization and after design or process changes. An overload is that condition of load in excess of rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. Load step transition time between 2 and 10 microseconds. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent load. Input step transition time between 2 and 10 microseconds. Turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input. Available Screening Levels and Process Variations for ASA28XXS Series Requirement MIL-STD-883 Method Temperature Range No Suffix ES Suffix HB Suffix CH Suffix -20°C to +85°C -55°C to +125°C -55°C to +125°C -55°C to +125°C Element Evaluation MIL-PRF-38534 ü ü ü 1010 Cond B Cond C Cond C Constant Acceleration 2001, 500g Cond A Cond A Burn-in 1015 48hrs @ 125°C 160hrs @ 125°C 160hrs @ 125°C Internal Visual 2017 Temperature Cycle Final Electrical (Group A) ¬ 48hrs @ 85°C MIL-PRF-38534 25°C 25°C -55, +25, +125°C -55, +25, +125°C Seal, Fine & Gross 1014 Cond C Cond A, C Cond A, C Cond A, C External Visual 2009 ¬ ü ü ü * per Commercial Standards Available Standard Military Drawing (SMD) Cross Reference ASA2805S/CH 5962-9462901 ASA2812S/CH 5962-9463101 ASA2815S/CH 5962-9463001 Part Numbering ASA 28 05 S / CH Model Input Voltage Screening – , ES, HB, CH 28 = 28V Output Voltage 5 = ±5, 12 = ±12, 15 = ±15 www.irf.com Outputs S = Single D = Dual 3 ASA28XXS Series ASA28XXS Block Diagram 1 6 +Input +Output Return 2 Error Amplifier Return 7 Case 8 Enable 5 Controller ASA28XXS Case Outline Pin No. 1.075 0.800 1 2 3 0.270 4 5 1.075 8 ASA28XXS Pin Designation 7 6 0.025 ± .003 Dia Pins 0.800 ±.005 Designation 1 Positive Output 2 Output Return 3 N/C 4 N/C 5 Enable 6 Positive Input 7 Input Return 8 Case 0.220 WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331 ADVANCED ANALOG: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500 Visit us at www.irf.com for sales contact information. Data and specifications subject to change without notice. 09/02 4 www.irf.com