PD - 94542A AHF2815T SERIES 28V Input, Triple Output HYBRID-HIGH RELIABILITY DC/DC CONVERTER Description The AHF2815T Series of DC/DC converters provide 8W of power and an extended temperature range for use in military and industrial applications. Designed to the nominal input requirements of MIL-STD-704, these devices have nominal 28VDC inputs with +5V and ±15V triple outputs to satisfy a wide range of requirements. The basic circuit utilizes a pulse width modulated, feed forward topology at a nominal switching frequency of 550KHz. Input to output isolation is achieved through the use of transformers in the forward and feedback circuits. The proprietary magnetic feedback circuit provides for an extremely wide bandwidth control loop with a high phase margin. The closed loop frequency response of this converter family extends to approximately 50KHz, resulting in superior line and load transient characteristics. This feedback method is also inherently temperature and radiation insensitive. This gives the AHF Series an important advantage over converters that incorporate optocouplers in their design. Manufactured in a facility qualified to MIL-PRF-38534, these converters are fabricated utilizing DSCC qualified processes. For available screening options, refer to device screening table in the data sheet. Variations in electrical, mechanical and screening can be accommodated. Contact IR Santa Clara for special requirements. www.irf.com AHF Features 16V to 40VDC Input Range (28VDC Nominal) 5V, ±15V Output Infinite Short Circuit and Overload Protection 8W Output Power Fast Loop Response for Superior Transient Characteristics Operating Temperature Range from -55°C to +125°C Available Popular Industry Standard Pin-Out Resistance Seam Welded Case for Superior Long Term Hermeticity Efficiency Up to 75% Shutdown from External Signal 400,000 Hour MTBF at 85% Constant Switching Frequency (550KHz Nominal) Standard Microcircuit Drawing Available 1 01/10/07 AHF2815T Series Specifications TCASE = -55°C to +125°C, VIN = +28V ± 5% unless otherwise specified 7 Typical Characteristics 550KHz Conversion frequency Temperature Range1 Test Symbol STATIC CHARACTERISTICS 1 Output voltage V OUT Recommended Operating temperature -55°C to +125°C Storage case temperature -65°C to +135°C IOUT = 0 (main) IOUT = 0 (dual) Current1,2,3 I OUT Ripple Voltage Power 1,4 1,2,3 P OUT REGULATION 1,3 Line Load1,3 VR LINE VR LOAD Input current Ripple current V RIP I IN 4 I RIP Efficiency Isolation E FF ISO Load fault power dissipation3 PD Switching frequency Inhibit Open Circuit Voltage FS V OI Unit Conditions -55°C ≤ Tc ≤ +125°C Vin = 28 Vdc ±5%, C L = 0 7 unless otherwise specified 1 V IN = 16, 28, and 40 Vdc (main) V IN = 16, 28, and 40 Vdc (dual) V IN = 16, 28, and 40 Vdc BW = DC to 2 MHz (main) V IN = 16, 28, and 40 VDC BW = DC to 2 MHz (dual) V IN = 16, 28, and 40 Vdc (main) (+dual) (-dual) (total) V IN = 16, 28, and 40 VDC IOUT = 120, 600,1200 mA (main) IOUT = 0, ±33.4, ±66.7 mA (dual) V IN = 16, 28, and 40 VDC IOUT = 120, 600, 1200mA (main) IOUT = 0, ±33.4, ±66.7 mA (dual) IOUT = 0, inhibit (pin 1) tied to input return (pin 7) IOUT = 0, inhibit (pin 1) = open IOUT = 1200mA (main) IOUT = ±66.7 mA (dual) BW = DC to 2MHz P OUT = Full load Input to output or any pin to case (except pin 6) at 500 V dc Tc = +25°C 5 Overload, TC = ±25°C Short Circuit, T C = ±25°C Weight AHF2815T Limits TC = Over TC = Over 25°C Temp 25°C Temp Min Max 4.95 4.90 ±14.50 ±14.35 120 0.0 5.05 5.10 ±15.50 ±15.65 1200 ±66.7 60 V V V V mA mA mV p-p 80 mV p-p W W W W 5.0 1.5 1.5 8.0 T C = 25°C Over Temp T C = ±25°C T C = ±25°C 25 ±35 ±75 mV 50 ±75 15 mA 50 50 mA mA p-p 68 100 T C = ±25°C 500 9.0 % MΩ 8.0 6.0 W 600 13 KHz V 35 g For Notes to Specifications, refer to page 3 2 www.irf.com AHF2815T Series Notes to Specifications 1. 2. 3. 4. 5. 6. 7. Tested at each output. Parameter guaranteed by line and load regulation tests. At least 20percent of the total output power should be taken from the (+5.0 volt) main output. Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. Above 125°C case temperature, derate output power linearly to 0 at 135 °C case. TCASE = -55°C to 85 °C for non screened grade. Block Diagram 2 +Input EMI Filter 8 Case Primary Housekeeping Supply 6 +Vout Filter & Regulator 4 -Vout 5 +5Vout 3 Output Return Drive Inhibit Input Pulse Width FB Modulator 1 Error Amp & Ref CS Input Return 7 Application Information Inhibit Function Connecting the inhibit input (Pin 1) to 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 of current. The open circuit voltage of the inhibit input is 11.5 ± 1.0VDC. The total surface area of the AHF package is 4.9 square inches. If a worse case full load efficiency of 75% is assumed, then the case temperature rise can be calculated as follows: ⎤ ⎡ 1 ⎤ ⎡ 1 P = POUT ⎢ − 1⎥ = 2.66W − 1⎥ = 8⎢ ⎣ .78 ⎦ ⎦ ⎣ Eff Thermal Management Assuming that there is no forced air flow, the package temperature rise above ambient (∆T) may be calculated using the following expression: ∆T = 80 A –0.7 p 0.85 (°C) ∆T = 80 (4.9) -0.7 (2.66) 0.85 = 60.4°C Hence, if T AMBIENT = +25°C, the DC/DC converter case temperature will be approximately 85°C if no heat sink or air flow is provided. where A = the effective surface area in square inhes (including heat sink if used), P = power dissipation in watts. Standard Microcircuit Drawing Equivalence Table Standard Microcircuit Drawing Number 5962-94623 www.irf.com Vendor Cage Code 52467 IR Standard Part Number AHF2815T 3 AHF2815T Series Mechanical Outlines Standard 0.205 (5.21) 0.030 dia., 8 pins (0.760) 8 1 0.905 (22.99) 2 7 6 0.505 (12.83) 1.105 (28.07) 3 4 0.705 (17.91) 1.450 (36.83) 5 0.800 (20.32) 1.120 (28.45) 0.090 R Typ (2.290) 0.260 (6.600) 0.330 (8.380) MAX Flanged Pin Designation 4 Pin # Designation 1 Inhibit Input 2 + Dual Output 3 +5V Output Return 4 - Dual Output 5 +5V Output 6 Case Ground 7 Input Return 8 +Input www.irf.com AHF2815T Series Device Screening Requirement MIL-STD-883 Method ES No Suffix HB CH -20°C to +85°C -55°C to +125°C -55°C to +125°C -55°C to +125°C Temperature Range Element Evaluation MIL-PRF-38534 N/A N/A N/A Class H 2023 N/A N/A N/A N/A Non-Destructive Bond Pull Internal Visual 2017 Yes Yes Yes Temperature Cycle 1010 N/A Cond B Cond C Cond C Constant Acceleration 2001, Y1 Axis N/A 500 Gs 3000 Gs 3000 Gs N/A N/A PIND 2020 N/A N/A Burn-In 1015 N/A 48 hrs@hi temp Final Electrical MIL-PRF-38534 25°C 25°C ( Group A ) & Specification PDA MIL-PRF-38534 N/A Seal, Fine and Gross 1014 Radiographic 2012 2009 External Visual 160 hrs@125°C 160 hrs@125°C -55°C, +25°C, -55°C, +25°C, +125°C +125°C N/A N/A 10% Cond A Cond A, C Cond A, C Cond A, C N/A N/A N/A N/A Yes Yes Yes Notes: Best commercial practice Sample tests at low and high temperatures -55°C to +105°C for AHE, ATO, ATW Part Numbering AHF 28 15 T F /CH Model Screening Level Input Voltage Nominal No Suffix, ES, HB, CH 28 = 28V Output Voltage 15 = 5V,±15V (Please refer to Screening Table) Package Options F = Flange Blank = Non-Flanged Output T = Triple WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105 IR SANTA CLARA: 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. 01/2007 www.irf.com 5