Power Electronics / Power Management


Switching regulator uses emulated current-mode control method

2 November 2005 Power Electronics / Power Management

National Semiconductor has expanded its family of high-voltage buck regulators with the LM5005, a high-frequency buck regulator that steps down an input voltage from 7 V to 75 V to produce a regulated 2,5 A power supply, adjustable from 1,225 V to 65 V. The compact LM5005 is optimised for 48 V telecom, automotive and industrial power supply applications.

The LM5005 regulator integrates a 75 V N-channel MOSFET and employs a proprietary scheme that uses emulated, current-mode pulse-width modulation. This control method generates an internal emulated inductor current ramp that significantly reduces the noise sensitivity of the controller. This allows it to reliably control very small duty cycles so designers can take full advantage of the LM5005's wide 75 V input range and 50-500 kHz frequency capabilities. In addition, current-mode control provides inherent line voltage feed-forward and simplified loop compensation.

A novel, bi-directional oscillator synchronisation pin allows multiple LM5005 regulators to self-synchronise or switch synchronously with an external clock. Additional protection features include current limit, thermal shutdown and remote shutdown capability. The device is available in TSSOP-20 package, with an exposed mounting pad for thermal dissipation.

For more information contact Simon Churches, Arrow Altech Distribution, +27 (0)11 923 9600, schurches@arrow.altech.co.za



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