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The RT7740MAH is an enhanced high-efficiency multi-mode PWM flyback controller, incorporating Richtek's proprietary SmartJitterTM technology. The innovative SmartJitterTM 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. The RT7740MAH features multi-mode control to optimize the product performance.The RT7740MAH operates as a current-mode PWM controller for flyback converters possessing comprehensive features, of which programmable protections consist of the propagation delay compensation, output overvoltage protection (OVP), external over-temperature protection (OTP), and bulk-capacitor brown-in/brown-out protection. With above features, the RT7740MAH enables one to achieve a cost-effective and compact design for a wide-range AC-DC conversion applications. The RT7740MAH is available in an SOT-23-6 package.
Proprietary SmartJitterTM Technology ► Reducing EMI Emissions of SMPS ► Eliminating Frequency-Jittering-Induced Output Ripple
Ultra-Low Start-Up Current (< 3μA)
Accurate Overcurrent Protection (OCP)
Programmable Line Compensation
Programmable Output Overvoltage Protection
Programmable External Over-Temperature Protection
Programmable Bulk-Capacitor Brown-In/Brown-Out Protection
Driver Capability: 200mA/-300mA
High Noise Immunity
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