PD-94541E AHF SERIES 28V Input, Single/Dual Output HYBRID-HIGH RELIABILITY DC-DC CONVERTER AHF Description The AHF Series of DC-DC converters feature single or dual outputs over the full military temperature range. No derating in output power is required, making them suitable for use in Features rugged military applications. The low profile, small outline 16V to 40V Input Range (28V Nominal) package is ideally suited to the tight board space require- DC DC Single and Dual Outputs ments of many industrial and aerospace applications. 12W Output Power Designed for nominal 28Vdc inputs, this family of converters 3 22.8W/in Power Density will meet the requirements of MIL-STD-704D. The basic cir- Low Input / Output Noise cuit utilizes a pulse width modulated, feed-forward topology (50mA / 60mV max. respectively) at a nominal switching frequency of 550KHz. Input to output P-P Indefinite Short Circuit and Overload Protection isolation is achieved through the use of transformers in the Wideband Control Loop for Superior Transient forward and feedback circuits. Characteristics No derating for -55C to +125C Operation The proprietary magnetic feedback circuit provides for an Constant Switching Frequency extremely wide bandwidth control loop with a high phase (550kHz Nominal) margin. The closed loop frequency response of this converter Standard Microcircuit Drawings Available 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 convert- ers that incorporate opto-couplers in their design. Manufactured in a facility fully qualified to MIL-PRF-38534, these converters are fabricated utilizing DLA qualified process. For available screening options, refer to device screening table in the data sheet. Variations are electrical, mechanical and screening can be accommodated. Extensive computer simulation using complex modeling enables rapid design modification to be provided. Contact IR HiRel San Jose with specific requirements. 1 2017-05-08 AHF SERIES (28V Input, Single/Dual Output) Specifications AHF2803R3S Absolute Maximum Ratings Input Voltage -0.5Vdc to +50V DC Soldering temperature +300C for 10 seconds Operating case temperature -55C to +125C Storage case temperature -65C to +135C Table I. Electrical Performance Characteristics Conditions Limits -55C T +125C C Parameter Symbol Group A Device Unit V = 28 V 5%, C = 0 IN DC L Subgroups Types Min Max Unless otherwise specified 1 3.26 3.34 Output voltage V I = 5% of rated load 01 OUT OUT V 2,3 3.23 3.36 1 Output current I V = 16, 28, and 40Vdc 1,2,3 01 3030 mA OUT IN Output power P V = 16, 28, and 40Vdc 1,2,3 01 10 W OUT IN 2 V = 16, 28, and 40Vdc, IN Output ripple voltage V 1,2,3 01 60 mVp-p RIP B.W. = 20 Hz to 2MHz V = 16, 28, and 40Vdc, IN Line regulation VR 1,2,3 01 25 mV LINE I = 5%, 50% and 100% OUT rated load V = 16, 28, and 40Vdc, IN Load regulation VR 1,2,3 01 50 mV LOAD I = 5%, 50% and 100% OUT rated load I = 0, Inhibit (Pin 1) OUT 12 tied to Input Return (Pin 7) mA Input current I 1,2,3 01 IN I = 0, OUT 30 Inhibit (Pin 1) = open I = 100% rated load OUT 2 Input ripple current I 1,2,3 01 50 mAp-p RIP B.W. = 20 Hz to 2 MHz 1 70 Efficiency E I = 100% rated load 01 FF OUT % 2,3 68 Input to output or any pin Isolation ISO to case (except Pin 6) at 1 01 100 M 500Vdc T = +25C C No effect on dc performance, 3,4 Capacitive load C 4 01 500 F L T = +25C C 5 Overload 1 01 6.0 Power dissipation P W D load fault Short circuit 1,2,3 01 2.0 Switching frequency F I = 100% rated load 4,5,6 01 500 600 kHz S OUT For Notes to Electrical Performance Characteristics, refer to page 3 2 2017-05-08