loading

SmartJitter™ Multi-Mode Flyback Controller

RT7739

Update Alert Share

The RT7739 series is an enhanced high-efficiency multi-mode PWM flyback controller, incorporating Richtek's proprietary SmartJitterTM technology. The innovative SmartJitterTM technology can reduce EMI emissions of a switch-mode power supply in green mode as well as eliminate output ripple due to frequency jittering. Also, the RT7739 series features a multi-mode control scheme, operating from continuous-conduction mode (CCM) to discontinuous-conduction mode (DCM) with valley switching, to achieve high efficiency and optimal performance.

The RT7739 is a current-mode PWM controller for flyback converters. It integrates comprehensive and programmable protection features, which include propagation delay compensation, output over-voltage protection (OVP), external over-temperature protection (OTP), and bulk-capacitor brown-in/brown-out protection. With the above features, the RT7739 enables a cost-effective and compact design for a wide range of AC-DC conversion applications. It is available in a SOT-23-6 package.

Applications

  • Switching AC/DC Adapter
  • NB Adapter
  • TV/Monitor Standby Power
  • PC Peripherals
Key Spec.
RT7739A RT7739C RT7739D RT7739G RT7739L RT7739N
Status Active Active Active Active Active Active
Feedback Regulation Mode SSR SSR SSR SSR SSR SSR
Switching Frequency_Normal (kHz) 65 65 65 65 65 65
Switching Frequency_Peak (kHz) 130.0 130.0 130.0 130.0
Peak load Application Yes Yes No Yes Yes No
HV Start-up No No No No No No
CCM/Valley Multi-mode Yes Yes Yes Yes Yes Yes
Programmable Burst/Green-mode No No No No No No
Brown-in/out Yes (Buck cap.Side) Yes (Buck cap.Side) Yes (Buck cap.Side) Yes (Buck cap.Side) Yes (Buck cap.Side) Yes (Buck cap.Side)
OVP OVP OVP OVP OVP OVP OVP
External OTP Yes Yes Yes Yes Yes Yes
UVLO ON (V) 16.5 16.5 16.5 16.5 16.5 16.5
UVLO OFF (V) 8 8 8 9 9 8
VDD OVP (V) 27.0 27.0 27.0 27.0 27.0 27.0
Features Cycle-by-Cycle Current Limit;OCP;OVP;UVP Cycle-by-Cycle Current Limit;OCP;OVP;UVP Cycle-by-Cycle Current Limit;OCP;OVP;UVP Cycle-by-Cycle Current Limit;OCP;OVP;UVP Cycle-by-Cycle Current Limit;OCP;OVP;UVP Cycle-by-Cycle Current Limit;OCP;OVP;UVP
Package Type SOT-26 SOT-26 SOT-26 SOT-26 SOT-26 SOT-26
Features
  • Proprietary SmartJitterTM Technology
    ► Reducing EMI Emissions of SMPS
    ► Eliminating Frequency-Jittering-Induced Output Ripple
  • Operating in Continuous-Conduction Mode (CCM), Discontinuous-Conduction Mode (DCM), DCM with Valley-Switching
  • Ultra-low Start-Up Current (<3μA)
  • Accurate Over-Current Protection (OCP)
  • Programmable Line Compensation
  • Programmable Output Over-Voltage Protection
  • Programmable External Over-Temperature Protection
  • Programmable Bulk-Capacitor Brown-In/Brown-Out Protection
  • Driver Capability : 200mA/-300mA
  • High Noise Immunity
Datasheet
TitleLast UpdateShareDownload
SmartJitter™ Multi-Mode Flyback Controller2016/08/24
TOP