High-voltage switching regulators

19 November 2014 Power Electronics / Power Management

ON Semiconductor has added three new current mode, fixed frequency switching regulators to its expansive power management product portfolio. Targeted at use in compact, high-reliability offline AC-DC switched-mode power supplies, they incorporate an avalanche-rated 650 V MOSFET and frequency foldback along with skip mode that improve light-load and standby efficiency, meeting the Energy Star EPS 2.0 standard.

The high degree of integration results in minimal external components and reduces the overall bill of materials, making the devices highly suited to power system designs for household appliances, DVD players and set-top boxes. The NCP1129, NCP1126 and NCP1124 can deliver up to 25 W, 15 W and 12 W respectively, and each generate a jittered 65 kHz or 100 kHz switching frequency, resulting in marked improvements in electromagnetic interference (EMI) performance.

It is possible for the maximum peak current to be adjusted via an external resistor, facilitating ramp compensation, so that stable continuous conduction mode (CCM) operation can be maintained. The frequency foldback mode permits power conversion efficiency levels to be raised under light load conditions, while skip mode can be activated to reduce standby power consumption at (or close to) a no-load scenario – with less than 100 mW drawn at high line when in standby mode.

The NCP112x devices all have a wide array of protective features including a 50 ms timer based, auto-recovery short circuit protection function. Furthermore, short-circuit fault conditions can be independently detected from the auxiliary winding voltage, thereby ensuring that comprehensive safeguards against short circuit events are in place.

The devices incorporate built-in thermal shutdown and over-voltage response mechanisms, as well as a 2 kV human body model (HBM) resilience rating to electrostatic discharge. They come in lead-free PDIP-7 packages that support an operational temperature range of -40°C to +150°C.

For more information contact Arnold Perumal, Avnet Kopp, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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