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STMicroelectronics Introduces New Generation High-Voltage Integrated Circuit for Resonant Half-Bridge Topology


New high-voltage controller improves efficiency and compactness of resonant converters while lowering their noise emissions.

Geneva, June 22,2006 - STMicroelectronics (NYSE: STM), a leader in manufacturing fully integrated Switch-Mode Power Supply (SMPS) ICs, today introduced an advanced double-ended controller specifically designed for the series-resonant half-bridge topology. Rich in functions and robust in design, the new-generation high-voltage IC guarantees excellent performance, allowing the design of fully protected and highly reliable power supplies that are particularly suited for use in applications such as Liquid Crystal Display (LCD) and Plasma Display Panel (PDP) TVs, high-end AC-DC adapters for laptops and game consoles, 80+ initiative-compliant ATX silver boxes, servers and telecom SMPS.

An evolutionary advance over the previous L6598, the new L6599 includes additional features such as a dedicated output for direct Power Factor Corrector (PFC) connection, two-level Over-Current Protection (OCP), latched Disable input, burst-mode operation at light-load, and an input for power-on/off sequencing or brownout protection.

The device operates at 50% complementary duty-cycle with a fixed dead-time inserted to ensure soft-switching. It enables high-frequency (up to 500kHz) operation with high efficiency and low Electromagnetic Interference (EMI) emissions. To drive the high-side switch with the bootstrap approach, the new device combines a high-voltage floating structure, able to withstand more than 600V, with a synchronous-driven high-voltage Lateral Double-diffused Metal Oxide Semiconductor (LDMOS) that eliminates the need for an external fast-recovery bootstrap diode.

The L6599 provides a typical peak current capability for both gate drivers of 0.6A source and 1.2A sink and enables designers to set the operating frequency range by using an externally programmable oscillator.

A non linear soft-start prevents inrush current and minimizes output-voltage overshoot. The device also features a controlled burst-mode operation, thus considerably reducing the average switching frequency and the associated losses under lightly loaded or unloaded conditions.

With the new resonant controller, designers can meet energy-saving requirements even in power-factor-corrected systems. A dedicated output enables the IC to switch off the Power Factor Corrector (PFC) pre-regulator during burst-mode operation, hence eliminating the no-load consumption of this stage.

Other key features of the L6599 include low power consumption (< 30mW), guaranteed latch-up free operation with slew rates up to 50V/ns, a not-latched disable input, and a high-performance Over-Current Protection (OCP) providing complete protection against both overload and short circuits. An additional latched disable input allows easy implementation of Over-Temperature (OTP) and/or Over-Voltage Protection (OVP).

The L6599 is offered in three versions: type L6599N is assembled in a PDIP16 package; L6599D and L6599DTR in a SO16N package. In production now, the IC is $1.20 each in 25,000 unit quantities.

Further information is available at

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About ST’s MPA Group (Micro, Power, Analog)
STMicroelectronics is a world leader in offering complete system solutions that leverage its rich portfolio of Microcontrollers, Power and Analog products; advanced process and design technologies; and application expertise. MPA’s emphasis on solutions allows the Company to minimize time-to-market for all customers worldwide in existing and emerging applications.

About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today’s convergence markets. The Company’s shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2005, the Company’s net revenues were $8.88 billion and net earnings were $266 million. Further information on ST can be found at


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