STMicroelectronics : High-voltage controller L6599A operates half-bridge powerconversion systems

Power Supply

STMicroelectronics’ L6599A is a double-ended controller for use in high-voltage power converters with a series-resonant half-bridge topology. It provides a 50% complementary duty cycle: the high-side and low-side switches are driven on and off 180° out-of-phase for exactly the same time. Output-voltage regulation is achieved by modulating the operating frequency.

A fixed dead-time inserted between the turn-off of one switch and the turn-on of the other guarantees soft-switching and enables high-frequency operation.

The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator.

• 600V-compatible high-side gate driver
• In-rush current control at start-up
• Two levels of over-current protection


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