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ARH2805S Datasheet(PDF) 9 Page - International Rectifier |
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ARH2805S Datasheet(HTML) 9 Page - International Rectifier |
9 / 12 page www.irf.com 9 ARH28XXS Series When an external frequency source is not available, an internal clock signal is provided through appropriate buffering at the sync out port. This port can drive a minimum of 3 ARH sync in ports thereby allowing all to operate at the same clock frequency. Output Short Circuit Protection Protection against accidental short circuits on the output is provided in the ARH28XXS converter. This protection is implemented by sensing primary switching current and reducing the switching pulse widths when a short occurs. The output current is therefore limited to a maximum value, which protects the converter. Under this condition the internal power dissipation is nearly the same as for maximum loading. Input Undervoltage Protection Input Filter Figure III. Input Filter EMI Filtering Output Noise Although the internal filtering provided at both input and output terminals of the ARH series converters is sufficient for most applications, some critical applications may require additional filtering in order to accommodate particular system requirements. While the internal input filter maintains input ripple current below 50 mA p-p, an external filter can be applied to further attenuate this ripple to a level below the CE03 limits imposed by MIL-STD-461. International Rectifier currently supplies such a filter housed in a complementary package. The catalog number of this part is ARF461. When attempting noise measurement at the output of switching converters, measurement techniques employed can have a significant influence on results during these tests. Any noise measurements should be undertaken only with test leads dressed as close to the device output pins as is physically possible. Probe ground leads should be kept to a minimum (<< 1") length to minimize the influence of parasitic impedances on results. To attenuate input ripple current, the ARH28XXS series converters incorporate a two-stage LC input filter illustrated in Figure III following. The elements of this filter comprise the dominant input load impedance characteristic, and therefore determine the nature of the current inrush at turn-on. A minimum voltage is required at the input of the converter to initiate operation. This voltage is set to a nominal value of 16.8 volts. To preclude the possibility of noise or other voltage variations at the input falsely initiating and halting converter operation, a hysteresis of approximately 1.0 volts is incorporated into this circuit. The converter is guaranteed to operate at 18 Volts input under all specified conditions. |
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