The ATW28XXD series is a high-reliability, high-density, and high-power DC/DC converter developed by IRF. It uses advanced analog hybrid technology and has an input range of 18 to 40 VDC, ±12V and ±15V output voltages, and can provide 30W output power. It has a fast loop response and excellent transient characteristics, and an operating temperature range of -55°C to +125°C. It also offers full military screening and an average failure-free time of 200,000 hours.
The ATW28XXD series provides high‑power‑density, dual‑output DC/DC converters designed for MIL‑STD‑704 input requirements. They operate from a nominal 28 VDC input and deliver +12 V and +15 V outputs with up to 30 W total power. The converters use a pulse‑width‑modulated push‑pull topology with a typical switching frequency of 270 kHz and feature isolation transformers for input‑to‑output isolation.
Four screening grades (CH, HB, ES, etc.) are offered to meet various military specifications, and options such as external EMI filtering and master‑slave synchronization are available. Detailed electrical performance tables list absolute maximum ratings, output voltage ranges, current limits, efficiency, and transient response characteristics.
| Input Voltage Range | -0.5 V to 50 V |
|---|---|
| Operating Temperature Range | -55 °C to +125 °C |
| Output Voltage Options | +12 V and +15 V dual outputs |
| Maximum Output Power | 30 W |
| Efficiency | up to 85 % |
| Switching Frequency | 270 kHz (typical) |
| MTBF | 200,000 h at 85 °C |
The converters accept an input voltage from –0.5 V up to 50 V.
Each device provides dual outputs of +12 V and +15 V.
The typical switching frequency is 270 kHz.
Connecting the inhibit input (Pin 8) to input common (Pin 10) shuts down the converter; the inhibit pin should be driven by an open‑collector device capable of sinking at least 400 µA.