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The RT7738 series are enhanced high efficient multi-mode PWM flyback controller with proprietary SmartJitterTM technology. The innovative SmartJitterTM technology can not only reduces the EMI emissions of SMPS when the system enters green mode, but also eliminates the output jittering ripple. Also, the RT7738 series feature Continuous Conduction Mode (CCM) and valley switching multi-mode control to optimize the product performance. To meet the stringent trend toward performance in recent years, the RT7738 series are the best choice for product designers.

The RT7738 is available in SOT-23-6 package, and it is a current mode PWM controller. Comprehensive protection and programmable functions are built-in, including a programmable propagation delay time compensation, a programmable output Over-Voltage Protection (OVP), a programmable external Over-Temperature Protection (OTP), and a programmable bulk capacitor Brown-in/ Brown-out protection. With the above features, the RT7738 is a cost-effective and compact solution for AC-DC products.

Applications

  • Switching AC-DC Adaptor
  • NB Adaptor
  • TV/Monitor Standby Power
  • PC Peripherals
Key Spec.
RT7738A RT7738G RT7738H RT7738L
Status Active Active Active Active
Feedback Regulation Mode SSR SSR SSR SSR
Switching Frequency_Normal (kHz) 65 65 100 65
Switching Frequency_Peak (kHz) 65 65 100 65
Peak load Application No No No No
HV Start-up No No No No
CCM/Valley Multi-mode CCM/Valley Switching Multi-mode CCM/Valley Switching Multi-mode CCM/Valley Switching Multi-mode CCM/Valley Switching Multi-mode
Programmable Burst/Green-mode No No No No
Brown-in/out Yes (Buck cap.Side) Yes (Buck cap.Side) Yes (Buck cap.Side) Yes (Buck cap.Side)
OVP OVP OVP OVP OVP
External OTP Yes Yes Yes Yes
UVLO ON (V) 16 14.5 14.5 14.5
UVLO OFF (V) 9 9 9 9
VDD OVP (V) 27 27 27 27
Features Current Mode Control;Cycle-by-Cycle Current Limit;OCP;OVP;PWM;SCP;UVP Current Mode Control;Cycle-by-Cycle Current Limit;OCP;OVP;PWM;SCP;UVP Current Mode Control;Cycle-by-Cycle Current Limit;OCP;OVP;PWM;SCP;UVP Current Mode Control;Cycle-by-Cycle Current Limit;OCP;OVP;PWM;SCP;UVP
Package Type SOT-26 SOT-26 SOT-26 SOT-26
Features
  • Proprietary SmartJitterTM Technology
    ► Reducing EMI Emissions of SMPS
    ► Output Jittering Ripple Elimination
  • Continuous Conduction Mode (CCM) and Valley Switching Mode Control
  • Ultra-low Start-up current (<3μA)
  • Accurate Over-Load Protection (OLP)
  • Programmable Propagation Delay Time 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 UpdateDownload
SmartJitterTM Multi-Mode Flyback Controller2015/08/20
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Please confirm with our distributor or sales representative for actual stock status.
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