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The RT7740MA is an enhanced high-efficiency multi-mode PWM flyback controller, incorporating Richtek's proprietary SmartJitter<sup>TM </sup>technology. The innovative SmartJitter<sup>TM</sup> technology is used to reduce EMI emissions of a switch-mode power supply in green mode operation, and at the same time eliminate the output ripple due to frequency jittering. In operation, the RT7740MA features a multi-mode control scheme, operating from the continuous-conduction mode (CCM) to the discontinuous-conduction mode (DCM) with valley switching, so as to achieve high efficiency as well as the optimal performance. The RT7740MA operates as a current-mode PWM controller for flyback converters possessing comprehensive features, of which programmable protections consist of the propagation delay compensation, output over-voltage protection (OVP), external over-temperature protection (OTP), and bulk-capacitor brown-in/brown-out protection. With above features, the RT7740MA enables one to achieve a cost-effective and compact design for a wide-range AC-DC conversion applications. The RT7740MA is available in an SOT-23-6 package.</p>
RT7740MA Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Proprietary SmartJitter<sup>TM</sup> Technology <ul class="lv2"> <li></li><li>Reducing EMI Emissions of SMPS </li><li>Eliminating Frequency-Jittering-Induced Output Ripple </li></ul> </li><li>Operating in Continuous-Conduction Mode (CCM), Discontinuous-Conduction Mode (DCM), DCM with Valley-Switching </li><li>Ultra-Low Start-Up Current (< 3μA) </li><li>Accurate Over-Current Protection (OCP) </li><li>Programmable Line Compensation </li><li>Programmable Output Over-Voltage Protection </li><li>Programmable External Over-Temperature Protection </li><li>Programmable Bulk-Capacitor Brown-In/Brown-Out Protection </li><li>Driver Capability : 200mA/-300mA </li><li>High Noise Immunity </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Switching AC-DC Adapter </li><li>NB Adapter </li><li>TV/Monitor Standby Power </li><li>PC Peripherals </li></ul></div>
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