InnoSwitch4-QR Enables Compact LED Driver Designs That Are >92% Efficient

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InnoSwitch4-QR Enables Compact LED Driver Designs That Are >92% Efficient

The InnoSwitch4-QR flyback switcher IC family significantly enhances the efficiency of flyback power converters up to 220 W, especially in applications requiring a compact form factor. A new design example report (DER-1038) showcases the benefits of InnoSwitch4-QR ICs in a slim, 100 W driver board for LED strip lights and linear luminaires used in industrial, commercial and residential highline applications (196 VAC to 308 VAC).

Paring an InnoSwitch4-QR device with a HiperPFS-4 power factor correction (PFC) control IC, this no-heatsink design realizes higher than 92% end-to-end efficiency across line with just 62 components in a 16 mm, low-profile module. It also delivers flicker-free performance while allowing operation at ambient temperatures up to 55 °C.

Key Advantages of InnoSwitch4-QR:

  • Integrated Functionality: Combining the primary controller, a 750 V PowiGaN switch, FluxLink feedback, SR driver, and secondary controller in a compact 24-pin low-profile package.
  • Streamlined Design: High QR-flyback and CCM PFC efficiency eliminates the need for complex half-bridge resonant topologies.
  • Flexible Output and Control Options: Configurable for constant voltage (CV) or constant current (CC) output with dimming support, including 0-10 V, PWM, and DALI.

On the front-end PFC stage, the HiperPFS-4 device incorporates a continuous conduction mode (CCM) PFC controller and a 600 V switch to achieve:

  • Higher than 0.95 power factor
  • Lower than 10% total harmonic distortion (THD) across nominal AC line
  • Lossless current sensing for reduced component count and increased efficiency

For more information:

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