Off-line switching converters blend efficiency & low standby drain

April 14, 2016 // By Graham Prophet
The latest variant of Power Integrations' InnoSwitch series, InnoSwitch-CE, has been design ed to meet increasing regulatory demands on consumer electronics power supplies and adaptors, and aims to offer a combination of efficiency across their power range, and low standby current.

Low quiescent current draw and synchronous rectification enable consumer electronics to meet ErP and ENERGY STAR Total Electrical Consumption requirements; InnoSwitch-CE is an added class of devices in the off-line CV/CC flyback switcher IC family.

 

InnoSwitch ICs use a magneto-inductive coupling technique called FluxLink which enables precise switching control of both primary and secondary MOSFETs without unreliable optocouplers; the architecture is secondary-side feedback via magnetic rather than optical coupling. This topology provides highly efficient synchronous rectification without the risk of shoot-through during transient loads or line surges, enhancing product reliability. The technique also exhibits excellent cross-regulation performance (immunity to output changes due to load changes on an adjacent output from the same device), which can permit the elimination of DC-DC converter stages in multi-output designs, further enhancing power sub-system efficiency and reducing system cost.

 

InnoSwitch-CE ICs target adapters and chargers for smart mobile products as well as open-frame power supplies for set-top boxes, computer monitors and other consumer audio-visual and entertainment products. InnoSwitch-CE ICs consume less than 10 mW no-load and are also very efficient across the entire load range, minimizing the energy wasted in low-power standby or sleep modes, which is often critical to meeting challenging TEC regulations.

 

The ICs include an on-chip 650V MOSFET with accurate line OV/UV monitoring, which delivers excellent protection against line surges and swells. Devices support multiple outputs with an accurate external current sense. The devices exceed all international energy-efficiency standards such as ENERGY STAR, California Energy Commission, European Union Code of Conduct (CoC) Version 5, Tier 2, and the US Department of Energy standards (DoE 6). Devices are UL1577 and TUV (EN60950) safety-approved and EN61000-4-8 (100 A/m) and EN61000-4-9 (1000 A/m) compliant.

 

Six devices are available, delivering between 12W and 25W of output power for USB Type-C chargers and consumer electronics such as set-top boxes. Reference design DER-471 is available from the Power Integrations website at www.power.com/innoswitch-ce

 

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