PD - 94542 AHF2815T SERIES 28V Input, Triple Output ADVANCED ANALOG HIGH RELIABILITY DC/DC CONVERTERS Description The AHF2815T Series of DC/DC converters provide 8 watts 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 opto-couplers in their design. Manufactured in a facility qualified to MIL-PRF-38534, these converters are available in four screening grades to satisfy a wide range of requirements. The CH grade is fully compliant to the requirements of MIL-PRF-38534 for class H. The HB grade is processed and screened to the class H requirement, but may not necessarily meet all of the other MIL-PRF-38534 requirements, e.g., element evaluation and Periodic Inspection (P.I.) not required. Both grades are tested to meet the complete group “A” test specification over the full military temperature range without output power deration. Two grades with more limited screening are also available for use in less demanding applications. Variations in electrical, mechanical and screening can be accommodated. Contact Advanced Analog for special requirements. www.irf.com AHF Features n 16 to 40 VDC Input Range (28 VDC Nominal) n 5V, ±15 Volt Output n Infinite Short Circuit and Overload Protection n 8 Watts Output Power n Fast Loop Response for Superior Transient Characteristics n Operating Temperature Range from -55°C to +125°C Available n Popular Industry Standard Pin-Out n Resistance Seam Welded Case for Superior Long Term Hermeticity n Efficiency Up to 75% n Shutdown from External Signal n 400,000 Hour MTBF at 85% n Constant Switching Frequency (550KHz Nominal) 1 10/08/02 AHF2815T Series Specifications TCASE = -55°C to +125°C, VIN = +28V ± 5% unless otherwise specified 7 n TYPICAL CHARACTERISTICS Temperature Range7 Isolation Weight Conversion frequency Test Symbol STATIC CHARACTERISTICS Output voltage1 VOUT Operating -55°C to +125°C case Storage -65°C to +135°C 100 megaohms at 500 volts DC 35 grams 550 kHz Conditions -55°C ≤ Tc ≤ +125°C Vin = 28 Vdc ±5%, CL = 0 unless otherwise specified7 IOUT = 0 (main) IOUT = 0 (dual)1 Current1,2,3 IOUT 1,4 Ripple Voltage VRIP Power1,2,3 POUT REGULATION Line1,3 VRLINE Load1,3 VRLOAD Input current IIN Ripple current4 IRIP Efficiency EFF Isolation ISO Load fault power dissipation3 PD Switching frequency Inhibit Open Circuit Voltage FS VOI Unit AHF2815T Limits TC = 25°C Over Temp TC = 25°C Over Temp VIN = 16, 28, and 40 Vdc (main) VIN = 16, 28, and 40 Vdc (dual) VIN = 16, 28, and 40 Vdc BW = DC to 2 MHz (main) VIN = 16, 28, and 40 VDC BW = DC to 2 MHz (dual) VIN = 16, 28, and 40 Vdc (main) (+dual) (-dual) (total) VIN = 16, 28, and 40 VDC IOUT = 120, 600,1200 mA (main) IOUT = 0, ±33.4, ±66.7 mA (dual) VIN = 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 POUT = Full load Input to output or any pin to case (except pin 6) at 500 V dc Tc = +25°C Overload, TC = ±25°C5 Short Circuit, TC = ±25°C 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 1.5 1.5 8 TC = 25°C Over Temp TC = ±25°C TC = ±25°C TC = ±25°C 25 ±35 ±75 mV mV mV 50 ±75 15 mV mV mA 50 50 mA mA p-p 68 % 100 MΩ TC = ±25°C 500 9 8 6 W W 600 13 kHz V 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 20 percent of the total output power should be taken from the (+5 volt) main output. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. 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. AHF2815T Block Diagram 2 + V out F ilter & R egulator EMI F ilter 8 + Inp ut 4 5 + V out P rim ary H ouse keep ing S upply 6 C ase -V out 3 R eturn D riv e P ulse W idth FB M odulator 1 E rror Amp & R ef E nable CS In put R eturn 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 400 µA of current. The open circuit voltage of the inhibit input is 11.5 ±1 VDC. 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) where A = the effective surface area in square inhes(including heat sink if used), P = power dissipation in watts. www.irf.com 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 − 1 = 8 − 1 = 2.66W P = POUT .78 Eff ∆T = 80 (4.9) -0.7 (2.66) 0.85 = 60.4°C Hence, if TAMBIENT = +25°C, the DC/DC converter case temperature will be approximately 85°C if no heat sink or air flow is provided. 3 AHF2815T Series AHF2815T Case Outlines Standard 0 .2 0 5 (5 .2 1 ) 0 .0 3 0 d ia ., 8 p in s (0 .7 6 0 ) 8 1 0 .9 0 5 (2 2 .9 9 ) 2 7 6 0 .5 0 5 (1 2 .8 3 ) 1 .1 0 5 (2 8 .0 7 ) 3 4 0 .7 0 5 (1 7 .9 1 ) 1 .4 5 0 (3 6 .8 3 ) 5 0 .8 0 0 (2 0 .3 2 ) 1 .1 2 0 (2 8 .4 5 ) 0 .0 9 0 R T y p (2 .2 9 0 ) 0 .2 6 0 (6 .6 0 0 ) 0 .3 3 0 (8 .3 8 0 ) MAX Flanged AHF2815T Pin Designation Pin No. Designation 1 Enable Input Part Numbering AHF 28 15 T F / CH M ode l 2 4 +Dual Output 3 Output Return 4 -Dual Output 5 +5V Output 6 Case Ground 7 Input Return 8 Positive Input S cree nin g Input V oltage 28 = 28V N o m ina l O utput V oltage 15 = 5 V ,±1 5V – , ES, H B, CH P ackag e O ption s O utputs F = F la nge O m it fo r S tan dard T = T riple www.irf.com AHF2815T Series Available Screening Levels and Process Variations for AHF2815T Series Requirement Temperature Range Element Evaluation Internal Visual Temperature Cycle Constant Acceleration Burn-in Final Electrical (Group A) Seal, Fine & Gross External Visual MIL-STD-883 Method No Suffix -20 to +85°C ES Suffix -55°C to +125°C HB Suffix -55°C to +125°C CH Suffix -55°C to +125°C MIL-PRF-38534 ∗ 2017 1010 2001 Yes Cond B Yes Cond C Yes Cond C 500g Cond A Cond A 1015 MIL-PRF38534 Specification 1014 48hrs @ 85°C 25°C 48hrs @ 125°C 25°C 160hrs @ 125°C -55, +25, +125°C 160hrs @ 125°C -55, +25, +125°C Cond A Cond A, C Cond A, C Cond A, C 2009 ∗ Yes Yes Yes * Per Commercial Standards Available Standard Military Drawing (SMD) Cross Reference Standardized Military Drawing Pin 5962-9462301 Vendor CAGE Code 52467 Vendor Similar Pin AHF2815T 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. 10/02 www.irf.com 5