RDK-248

The RDK-248 device family members incorporate a continuous conduction mode (CCM) boost PFC controller, gate driver, and high voltage power MOSFET in a single, low-profile eSIP™ power package that is able to provide near unity input power factor. The RDK-248 devices eliminate the PFC converter’s need for external current sense resistors, the power loss associated with those components, and leverages an innovative control technique that adjusts the switching frequency over output load, input line voltage, and even input line cycle. This control technique is designed to maximize efficiency over the entire load range of the converter, particularly at light loads. Additionally, this control technique significantly minimizes the EMI filtering requirements due to its wide-bandwidth spread spectrum effect. RDK-248 includes standard set of comprehensive protection features, such as integrated soft-start, UV, OV, brown-in/out, and hysteretic thermal shutdown. RDK-248 also provides cycle-by-cycle current limit for the power MOSFET, power limiting of the output for overload protection, and pin-to-pin short-circuit protection.

RDK-248 innovative variable-frequency continuous conduction mode of operation (VF-CCM) minimizes switching losses by maintaining a low average switching frequency, while also varying the switching frequency in order to suppress EMI, the traditional challenge with continuous-conduction-mode solutions. Systems using RDK-248 typically reduce the total X and Y capacitance requirements of the converter, the inductance of both the boost choke and EMI noise suppression chokes, reducing overall system size and cost. Additionally, compared with designs that use discrete MOSFETs and controllers, RDK-248 devices dramatically reduce component count and board footprint while simplifying system design and enhancing reliability. The innovative variable-frequency, continuous conduction mode controller enables the RDK-248 to realize all of the benefits of cont

• Single chip solution for boost power factor correction (PFC)
  • EN61000-3-2 Class C and D compliant
• High light load efficiency at 10% and 20% load
  • >95% efficiency from 10% load to full load
  • <130 mW no-load consumption at 230 VAC with output in regulation
  • <50 mW no-load consumption at 230 VAC in remote off state
• Frequency adjusted over line voltage, and line cycle
  • Spread-spectrum across >60 kHz window to simplify EMI filtering requirements
  • Lower boost inductance
• Provides up to 205 W peak output power
• High integration allows smaller form factor, higher power density designs
  • Incorporates control, gate driver, and high-voltage power MOSFET
  • Internal current sense reduces component count and system losses
• Protection features include: UV, OV, OTP, brown-in/out, cycle by-cycle current limit, and power limiting for overload protection
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