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Richtek

The RT7795M is a specialized controller designed for Asymmetrical Half-Bridge (AHB) flyback converters, commonly employed in various applications. It is capable of delivering an output power of 300W and features a versatile output voltage range from 5V to 48V, making it particularly well-suited for USB-PD EPR (Extended Power Range) applications.To ensure peak efficiency, the RT7795M utilizes a resonant mode of operation for the AHB, effectively minimizing power losses for both the AHB and the secondary-side synchronous rectifier. Furthermore, the RT7795M addresses potential audio noise issues through a proprietary jitter approach that disperses the energy and frequency of the noise.In addition to its performance features, the RT7795M includes comprehensive protection functionality, ensuring the safety and reliability of the power supply.The RT7795M collaborates with the synchronous rectification controller RT7220E to offer a comprehensive power solution, maximizing efficiency.For USB-PD or programmable power supply applications, pairing the RT7795M with the secondary-side controller RT7209 ensures a robust and secure design, safeguarding both the power supply and any connected systems.The recommended junction temperature range is from -40°C to 125°C, while the ambient temperature range is from -40°C to 85°C.

应用

  • General Purpose Power Supply
  • High Power-Density Power Adapters
  • USB-PD EPR Power Adapters
  • Fast Battery Charger AC-DC Power Converters
主要规格
RT7795M
Status Active
Feedback Regulation Mode SSR
Switching Frequency_Normal (kHz) 130
Switching Frequency_Peak (kHz) 250
Peak load Application Yes
HV Start-up Yes
CCM/Valley Multi-mode QR/Valley Switching Multi-Mode
Programmable Burst/Green-mode Yes
Brown-in/out Yes (AC Side)
OVP OVP
External OTP Yes
UVLO ON (V) 18.5
UVLO OFF (V) 8
VDD OVP (V) 66.5
Features Current Mode Control;Cycle-by-Cycle Current Limit;OCP;OVP;PWM;SCP;UVP
Package Type WQFN4x6-24
关键特性
  • High Efficiency
    - Continue Resonant Mode (CRM)
    - Cycle-Skipping and Burst Mode
    - Zero Voltage Switching (ZVS) On-Time Modulation
  • High Integration
    - 625V Start-Up Device
    - 625V High-Side (HS) Gate Driver
    - Built-In Voltage Regulator (VREG-LDO)
    - X-Capacitor Discharge Function
  • Wide-Range Output Voltage
    - Wide VDD Range: 11V to 63.2V
    - Adaptive Low-Side (LS) Minimum On-Time
  • Key Parameter Settings
    - MTHS (Maximum HS On-Time)
    - TLSMIN (Minimum LS On-Time)
    - RZVS (LS ZVS Pulse Initial On-Time)
    - TVPSEL (Valley and Peak Signal Debounce Time)
    - BMSEL (Burst-Mode Voltage Threshold)
  • Comprehensive Protection Functions
    - Brown-In (BNI) and Brown-Out (BNO) Protection
    - VDD Overvoltage Protection
    - External Over-Temperature Protection
    - Overcurrent Protection (OCP)
    - Resonant Negative Switching Current OCP
    - Output Overvoltage and Undervoltage Protection (OVP/UVP)
    - Secondary Rectifier Short Protection (SRSP)
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