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Richtek Flyback PWM controller provides the innovative SmartJitterTM technology, which effectively reduces EMI emissions when SMPS in green mode, and simultaneously eliminates jittering ripples at output. In additions, our new products are all featured with Continuous Conduction Mode(CCM) and Valley Switching multi-mode control to optimize the performance under various load condition.

With comprehensive Array of Safety features help system simplification, Richtek can help reduce external components and improves the reliability of SMPS. In the revolution of SMSP facing stringent trend toward high cost-effective performance, Richtek controllers are your best choice.

Product Line

6P SSR PWM Selection Guide (SSR PWM Flyback Controllers in SOT-23-6 package)
Part Number Power Saving Operation Frequency Control Mode Jitter External OTP Peak Power Brown-in/out
RT7739 < 75mW 65kHz/130kHz SSR
CCM/Valley		 V V V V
RT7738 < 75mW 65kHz/100kHz SSR
CCM/Valley		 V V X V
RT7737 < 75mW 65kHz/100kHz SSR
CCM		 V V X X
RT7736 < 75mW 65kHz/100kHz SSR
CCM		 V V X V
R7735 < 100mW 65kHz/100kHz SSR
CCM		 V V X X
R7731 < 300mW Adjust Frequency SSR
CCM		 V X X X

6P PSR Selection Guide (PSR PWM Flyback Controllers in SOT-23-6 package)
Part Number Power Saving Operation Frequency Control Mode Jitter External OTP Peak Power Brown-in/out
RT7713 < 75mW 65kHz/80kHz PSR w/i CC
CCM/Valley		 V V X V
RT7715 < 75mW 65kHz/80kHz SSR w/i CC
CCM/Valley		 V V X V

8P SSR Selection Guide (SSR PWM Flyback Controllers in SOP-8 package)
Part Number Power
 Saving		 Operation
 Frequency		 Control Mode HV pin Xcap
Discharge		 Jitter External
 OTP		 Peak
 Power		 Brown-in/out Adaptive
OVP/OCP
RT7789D < 50mW 65kHz SSR
CCM/Valley		 V V V V X V X
RT7786 < 50mW 85kHz SSR
CCM/Valley		 V V V V X V V
RT7781 < 50mW 65kHz SSR
CCM		 V V V V X V X
R7780 < 50mW 65kHz SSR
CCM		 V X V X X X X
R7779 < 50mW 65kHz SSR
CCM		 V X V X X X X

The following is a list of products released in the last

Part NumberDescriptionShareDatasheetFree Sample
RT7752GxQPWM Controller for Programmable Power Converter (USBPD) Not available
RT7740SmartJitterTM Multi-Mode Flyback Controller Not available
RT7740xNSmartJitterTM Multi-Mode Flyback Controller Not available
RT7739NCSmartJitterTM Multi-Mode Flyback Controller Not available
RT7791PPWM Controller for Programmable Power Converter (USBPD) Not available
RT7739LNSmartJitterTM Multi-Mode Flyback Controller Not available
RT7300ADActive PFC Controller with Critical Conduction Mode Not available
RT7739LCSmartJitterTM Multi-Mode Flyback Controller Not available
RT7791PWM Controller for Programmable Power Converter (USBPD) Not available
RT7752PWM Controller for Programmable Power Converter (USBPD) Not available
RT7789DPowerZeroTM Multi-Mode Flyback Controller Not available
RT7715Digital Lite (d PWMTM ) Hybrid Mode SSR Controller Not available
RT7713Digital Lite (d PWMTM ) Hybrid Mode PSR Controller Not available
R7779CBurst Triple Mode PWM Controller with Integrated HV Start-up Device for Zero Power Monitor Application Not available
RT7738SmartJitterTM Multi-Mode Flyback Controller Not available
R7779Burst Triple Mode PWM Controller with Integrated HV Start-up Device for Zero Power Monitor Application Not available
RT7738HCSmartJitterTM Multi-Mode Flyback Controller Not available
R7732Enhanced PWM Flyback Controller Not available
RT7739LASmartJitterTM Multi-Mode Flyback Controller Not available
RT7739LGSmartJitterTM Multi-Mode Flyback Controller Not available
Technical Documents
TitleLast UpdateShareDownload
Introduction to Richtek USB Type-C Power Delivery Solutions2018/12/18
Power Solutions for LED Lighting Applications2018/11/22
Feedback Control Design of Off-line Flyback Converter2018/10/30
Single-Stage High Power Factor Flyback for LED Lighting2016/06/21
Design Tool
TitleLast UpdateShare
RT7300B Flyback Design Tool2019/04/16
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