TNY 267 Power Integrations IC

TNY267 Low Power Off-line Switcher IC

The TNY267 IC maintains the simplicity of the TinySwitch topology, while providing a number of new enhancements to further reduce system cost and component count, and to practically eliminate audible noise. Like Tiny Switch, a 700 V power MOSFET, oscillator, high voltage switched current source, current limit and thermal shutdown circuitry are integrated onto a monolithic device. The start-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias winding and associated circuitry.

Fetures of TNY267 IC:

• Fully integrated auto-restart for short circuit and open loop fault protection–saves external component costs

• Built-in circuitry practically eliminates audible noise with ordinary varnished transformer

• Programmable line under-voltage detect feature prevents power on/off glitches–saves external components

• Frequency jittering dramatically reduces EMI (~10 dB) –minimizes EMI filter component costs

• Very tight tolerances and negligible temperature variation on key parameters

• High voltage powered–ideal for charger applications

• High bandwidth provides fast turn on with no overshoot

• Current limit operation rejects line frequency ripple Built-in current limit and thermal protection