Circuit & System Protection


Regulators offer improved system reliability

27 June 2007 Circuit & System Protection

According to Intersil, the ISL6422B and ISL6423B LNB (low noise block) supply and control voltage regulators, optimised for satellite set-top boxes, are the industry's first to use an I²C interface to improve system reliability by reporting diagnostics and protecting systems against over-voltage, over-current, over-temperature and backward current. With a supply current of 4,0 mA, a standby current of 1,5 mA and a typical dropout voltage of 0,8 V, these devices deliver superior power dissipation performance. The input voltage range of 8 V to 14 V also provides enhanced design flexibility. These devices save board space not only due to their package size, but also because they require very few external components to operate. The ISL6422B (dual output) has five current range settings up to 750 mA and the ISL6423B (single output) has four current range settings up to 750 mA. These devices feature remote device control and FLT-bar interrupt pin. Both devices feature a built-in tone oscillator factory-trimmed to 22 kHz and a decoder that facilitates the use of DiSEqC 2.0 (EutelSat) protocol. An external modulation input also allows the DiSEqC modulation of an externally generated tone protocol, be it the envelope or a 22 kHz modulated stream.



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