Offline switcher achieves 92% efficiency in classic flyback topology
The Power Integrations TinySwitch-5 family of integrated offline switcher ICs improves conversion efficiency in low- and mid-power flyback converters with an output of up to 175W.
The TinySwitch-5 dynamically adjusts its switching frequency to maintain high efficiency across varying loads, achieving up to 92% efficiency with standard diode rectification and optocoupler feedback across a wide load range.
The fast switching capability of up to 150kHz, enables power-system designers to reduce transformer size. The TinySwitch-5 offline switchers also provide a highly integrated solution for flyback circuits, combining a 725V power MOSFET, control and protection circuitry into a single package.
The TinySwitch-5 flyback controller can operate in continuous conduction mode (CCM) or discontinuous conduction mode (DCM). This control approach reduces switching losses during low-power operation while maintaining sufficient auxiliary output to support display, communication, or control functions.
The IC supports up to 75W operation without a heat-sink due to improved thermal management in its enhanced package structure. No-load power consumption of less than 30mW at 230V ac helps product manufacturers to comply with strict standby power regulations.
Built-in line under- and over-voltage protection stabilizes operation in regions with variable mains conditions, while frequency jittering reduces EMI without the need for external filtering.
The TinySwitch-5 architecture allows designers to meet high efficiency targets without adopting more complex synchronous rectification or resonant converter topologies, retaining the simplicity of a traditional flyback design.