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The RT7781 is a series of high-performance current mode PWM controllers with Richtek proprietary PowerZero<sup>TM</sup> technology. The PowerZero<sup>TM</sup> provides an excellent green power solution, especially under light-load and no-load conditions. The integrated high-voltage device provides fast start-up function without external start-up resistors. It also features brown-in and brown-out detection. <p align="justify">The RT7781 offers complete protection functions such as internal Over-Temperature Protection (OTP), Over-Load Protection (OLP) and VDD Over-Voltage Protection (OVP). It also features Secondary Rectifier Short-circuit Protection (SRSP) and Current Sensing pin (CS) open-circuit protection. Due to these protections, design of power supply unit becomes simple and reliable. </p><p align="justify">The RT7781 provides several versions, shown in the RT7781 version table, for various applications. It is targeted for cost-effective and compact power supply units such as NB adaptors.</p>
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<li class="mv5"> PowerZero<sup>TM</sup> Technology<br />► Integrated 700V Start-Up Device<br />► Brown-In and Brown-Out <br /></li><li class="mv5"> Low No-Load Input Power (<50mW) (RT7781G/L/A/C)<br /></li><li class="mv5"> Low No-Load Input Power (<30mW) (RT7781T)<br /></li><li class="mv5"> Accurate Over Load Protection<br /></li><li class="mv5"> Driver Capability : 400mA/-400mA<br /></li><li class="mv5"> PRO Pin for Arbitrary External Protection <br />(RT7781G/L/A/T)<br /></li><li class="mv5"> ACD Pin for TV Application (RT7781C)<br /></li><li class="mv5"> Disable Mode for 30mW Solution (RT7781T)<br /></li><li class="mv5"> Jittering Frequency<br /></li><li class="mv5"> Soft Driving for Reducing EMI Noise<br /></li><li class="mv5"> VDD Over Voltage Protection<br /></li><li class="mv5"> Internal Over Temperature Protection<br /></li><li class="mv5"> Secondary Rectifier Short Protection<br /></li><li class="mv5"> CS Pin Open Protection<br /></li><li class="mv5"> RoHS Compliant and Halogen Free</li>
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<li class="mv5"> NB Adaptor<br /></li><li class="mv5"> Switching AC/DC Adaptor with Low No-Load Input Power<br /></li><li class="mv5"> TV and Monitor Applications<br /></li><li class="mv5"> Open Frame Power Supply</li>
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