Robust high-voltage ICs simplify HID ballast circuits and extend lamp life

18 October 2006 Power Electronics / Power Management

International Rectifier has introduced the IRS2453D family of integrated 600 V self-oscillating full-bridge driver ICs for HID ballast applications including general lighting, outdoor street lighting and projectors.

The new ICs utilise IR's proprietary high-voltage integrated circuit (HVIC) technology, integrating two high-side and two low-side gate drivers. This process allows improvements in device capabilities, tighter specifications, temperature stability and the integration of previously unavailable features.

The IRS2453D features a simple RC network to program the oscillator, eliminating the need to synchronise two half-bridge drivers. In contrast, solutions using two SO-8 driver ICs require a separate oscillator to drive each half-bridge, resulting in unsymmetrical voltages across the load due to mismatching of the on-time states caused by tolerances and temperature. In lighting applications, this can cause mercury migration shortening lamp life. The IRS2453D overcomes this problem by driving both half-bridge drivers with a single oscillator to guarantee accurate matching over the complete temperature and supply voltage range.

Simplifying overall design, the IRS2453D integrates both a latched and non-latched shutdown input, and eliminates up to seven components. The latched shutdown allows for implementation of various protection features, while the non-latched shutdown allows for easy interface to a microcontroller for use in a wider variety of power management applications.

Available in 14-lead DIP and SO packages, the devices provides 50% duty cycle, fixed 1 μs (typical) internal deadtime and integrated bootstrap circuitry. While the new ICs are designed to drive the required low-frequency AC voltage in HID lamps, they can also be used as a general-purpose block for other high-frequency applications such as fluorescent ballasts and power supplies.

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