Buck converters

12 October 2011 Power Electronics / Power Management

Diodes Incorporated has introduced a pair of synchronous DC-DC buck converters for applications such as digital TV, LCD monitors and set-top boxes.

Capable of handling continuous load currents of up to 2 A or 3 A, respectively, the AP6502 and AP6503 can support 12 V and 5 V bus systems and are able to achieve efficiency rates as high as 95%. The output voltage is set using an external resistor divider, which can accommodate any output voltage setting down to 0,925 V.

With a switching frequency of 340 kHz, and incorporating low RDS(ON) high-and low-side power MOSFETs, both devices offer an efficient solution, particularly effective for distributed power architectures. In addition, the parts include an external, programmable soft start control input that reduces excess current during initial power-up of the application. The combination of enable and programmable soft start helps in systems requiring power sequencing. Integrated over-current protection and thermal shutdown features stabilise the system and ensure long-term reliability.

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