ST's wide portfolio of pulse-width modulator (PWM) controllers can support isolated and non-isolated AC-DC and DC-DC switch mode power supplies based on the most popular topologies in both single-ended (such as fly-back, forward or quasi-resonant) and double-ended configurations (such as asymmetrical half-bridge) for mid- to high-power SMPS.

Our offer includes a number of advanced and digital controllers, featuring innovative solutions to optimize converter efficiency in a wide range of load conditions and especially at light loads such as for high voltage start-up. These controllers also integrate a comprehensive set of protections for enhanced robustness and reliability even in an extended temperature range for outdoor applications. The result is a reduction in the number of external components, minimizing converter size and cost.

The industry standard controllers of the UC (voltage mode) and SG (current mode) series are also available for more mainstream SMPS designs.

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Compact quasi-resonant PWM controller for ultra-low standby power supplies

The STCH03 features a built-in high-voltage start-up circuit with zero power consumption, fully integrated blocks for primary-side constant-current output regulation and advanced power management, making it the best choice for high efficiency and ultra-low standby consumption power supplies with excellent dynamic performance.

Designed to provide a constant output current (CC) regulation using primary-sensing feedback, the STCH03 reduces BOM costs and simplifies your design as a dedicated current reference IC and current sensor are no longer required.

Moreover, an embedded frequency jitter technique helps reduce EMI noise.

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