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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.

Applications

  • Switching AC-DC Adapter
  • NB Adapter
  • TV/Monitor Standby Power
  • PC Peripherals
Key Spec.
RT7740MAH
Status Active
Feedback Regulation Mode SSR
Switching Frequency_Normal (kHz) 65
Switching Frequency_Peak (kHz) 130
Peak load Application Yes
HV Start-up No
CCM/Valley Multi-mode CCM/Hard Switching Multi-Mode
Programmable Burst/Green-mode No
Brown-in/out Yes (Buck cap.Side)
OVP OVP
External OTP Yes
UVLO ON (V) 16.5
UVLO OFF (V) 7
VDD OVP (V) 28
Features Current Mode Control;Cycle-by-Cycle Current Limit;OCP;OVP;PWM;SCP;UVP
Package Type SOT-26
Features
  • 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
Please confirm with our distributor or sales representative for actual stock status.
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