PWM controller and driver designed for POL converters
23 February 2005
Power Electronics / Power Management
A new pulse width modulated (PWM) dual synchronous buck controller with driver IC for point-of-load (POL) buck converters is available from International Rectifier. Typical applications include dual phase ASIC and DDR memory power management circuits and datacom and telecom power supplies requiring multiple outputs.
The IRU3146 features 180° out-of-phase operation. This reduces input and output filter requirements resulting in fewer components. In addition, it is ideal for two-phase single- or dual-output synchronous buck converter applications. In single output two-phase applications, the solution can deliver up to 30 A, says the company. Where two separate voltages are required, it will deliver up to 15 A per output. The output voltage can be configured between 0,8 V and 3,3 V.
While using the IRU3146 in conjunction with two optimised MOSFET pairs (consisting of one IRF7821 in the high-side and one IRF8113 in the low-side of each pair), IR claims the converter reaches up to 90,8% efficiency at 12 Vin, 3,3 Vout at 30 A full load condition.
The IRU3146 offers two independent programmable soft starts, which can provide individual output rise time control and limit the in-rush current during start-up. Independent control over the output voltage rise times is especially important in systems requiring output voltage sequencing for sensitive load requirements.
Over-current protection can be set to either latch or hiccup mode shutdown. Hiccup current limit protection is important for systems that need maximum up-time, and works by automatically restarting the converter once the short condition is removed. In an over-temperature condition, the IC will shut down when the temperature exceeds 140°C. In synchronisation mode, the IRU3146 is capable of accepting an external logic level signal from 200 to 400 kHz which helps the overall system filter design at the input to the POL converters, since all POLs on-board can be synchronised together.
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