Shenzhen CXW Technology., Co Ltd
15 years of experience
Overview
The CX78GD024E is a quasi-resonant flyback power conversion chip with integrated D-GaN, designed for isolated flyback switching power supplies targeting high performance, low standby power, low cost, and high efficiency within 68W.
The CX78GD024E is a quasi-resonant flyback power conversion chip with integrated D-GaN, designed for isolated flyback switching power supplies targeting high performance, low standby power, low cost, and high efficiency within 68W. Under no-load, light-load, or heavy-load conditions, the CX78GD024E automatically switches its operating mode and frequency, which are internally adjusted by the chip. Under light load, the chip operates in green mode to reduce losses and improve overall system efficiency.
The CX78GD024E requires only a very low current for startup and operation, allowing the use of high-value resistors in the startup circuit to further reduce standby power consumption. The chip incorporates a built-in slope compensation circuit to prevent sub-harmonic oscillations and improve system stability when operating at large duty cycles. It features a built-in leading-edge blanking time to eliminate the impact of diode reverse recovery current in the snubber network. Frequency jittering technology is employed to effectively improve the system's EMI performance. The burst mode frequency is set above the audio range (22kHz) to avoid audible noise during operation.
The CX78GD024E integrates multiple protection features, including cycle-by-cycle current limiting (VCS_LIM), VDD over-voltage protection (OVP), VDD over-voltage clamp, under-voltage lockout (UVLO), over-temperature protection (OTP), input/output over/under-voltage protection, and external NTC support. The internal soft-driver structure further enhances the system's EMI characteristics.
Features
- Built-in D-GaN Power Transistor
- Standby Power Consumption Less Than 75mW for Full Input Voltage Range
- Full-Range Operation in Quasi-Resonant Mode
- Wide VDD Supply: VDD = 6.5V - 78.5V
- External NTC Protection
- Built-in Soft Start to Reduce Vds Stress on the Power Transistor
- Frequency Jittering Function for Improved EMI Performance
- Burst Mode Operation for Improved Light-Load Efficiency and Reduced Standby Power
- Input and Output Over/Under-Voltage Protection
- Built-in Synchronous Slope Compensation
- Low Startup Current, Low Operating Current
- Built-in Leading-Edge Blanking (LEB) Function
- Built-in Power Limiting and Current Limiting (LPS) Function
- Built-in CS Short Circuit Protection (CSSP) Function
- Cycle-by-Cycle Current Limiting (VCS_LIM)
- VDD Voltage Clamp (VDD_CLAMP), VDD Over-Voltage Protection (VDD_OVP), Under-Voltage Lockout (UVLO)
- Secondary-Side Output Diode Short Circuit Protection (SSSP)
- Over-Temperature Protection (OTP)
- ESOP-10W Package
Applications
- QC, PD Fast Chargers
- Power Adapters for PDAs, Digital Cameras, Camcorders
- Set-Top Box Power Supplies
- Open-Frame Switching Power Supplies
- PC Auxiliary Power Supplies
CX7538BS is a high-performance secondary side synchronous rectification control circuit for switch-mode power <br/><br/>supplies. It easily meets the Level VI energy efficiency requirements in low-voltage, high-current switch-mode power <br/><br/>supply applications, making it an ideal solution for ultra-low forward voltage drop rectification devices. It also supports <br/><br/>various operating modes of switch-mode power supplies, such as CCM, QR , and DCM . Its extremely low forward <br/><br/>voltage drop results in much less conduction loss compared to Schottky diodes, greatly improving the system&#039;s <br/><br/>conversion efficiency and significantly reducing the temperature of the rectification device.<br/><br/><br/><br/>The CX7538BS chip features an NMOSFET synchronous rectification switch with a built-in voltage tolerance of 60V <br/><br/>and an extremely low internal resistance, with a typical RdsON as low as 12mΩ, providing the system with an output <br/><br/>capability up to 4A. The chip determines its switching state by detecting the source-drain voltage of the built-in <br/><br/>MOSFET, making it compatible with flyback converters in continuous mode, discontinuous mode, and quasi-resonant <br/><br/>operation modes.
Overview
The CX78GD024E is a quasi-resonant flyback power conversion chip with integrated D-GaN, designed for isolated flyback switching power supplies targeting high performance, low standby power, low cost, and high efficiency within 68W.
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