Diodes Incorporated has developed the AP3304, a PWM controller specifically optimized for high-performance offline flyback converters. This controller offers several key features that enhance its performance and efficiency.
One notable feature of the AP3304 is its peak-current control, which allows for precise regulation of the output current. This ensures stable and reliable operation of the converter, even under varying load conditions. Additionally, the controller operates in multi-mode (QR+CCM), allowing it to adapt to different operating conditions and maximize efficiency.
To minimize standby power consumption, the AP3304 incorporates the innovative Burst Mode® technology. When the converter is operating at no load or light load, the IC automatically enters Burst Mode®, significantly reducing power consumption during these periods. This feature is particularly beneficial for applications that require low standby power, such as consumer electronics and battery-powered devices.
Another highlight of the AP3304 is its frequency foldback capability. As the load increases, the controller switches from Burst Mode® to QR mode, adjusting the switching frequency to maintain optimal efficiency. This dynamic frequency adjustment not only improves system efficiency but also helps reduce electromagnetic interference (EMI) emissions.
To further enhance its performance, the AP3304 includes a built-in frequency dithering function. This function introduces small variations in the switching frequency, effectively spreading out the energy across a wider frequency range and reducing EMI emissions. This is especially important for applications that require strict compliance with electromagnetic compatibility (EMC) standards.
The AP3304 also incorporates comprehensive protection features to ensure the reliability and safety of the converter. These features include brownout protection, cycle-by-cycle current limit (OCP), VCC overvoltage protection (VOVP), secondary-side output OVP (SOVP) and UVP (SUVP), internal OTP, overload protection (OLP), and pins fault protection. These protections safeguard the converter and its components from potential faults and abnormal operating conditions.
In terms of packaging, the AP3304 is offered in a SOT26 package type. This compact and cost-effective package is suitable for space-constrained applications and facilitates easy integration into existing designs.
In conclusion, the Diodes AP3304 PWM controller is an excellent choice for high-performance offline flyback converters. Its optimized design, including peak-current control, multi-mode operation, Burst Mode® technology, frequency foldback, and comprehensive protection features, ensures efficient and reliable operation. With its compact SOT26 package, the AP3304 offers a versatile solution for various applications.
Multi-mode of operations
Improves efficiency across all load levels
QR mode at high-line voltage and CCM mode at low-line voltage
Available in SOT26 package type
60 V process of VCC pin for wide range output application
Lowers BOM (bill of materials) quantity and simplifies system design for USB PD applications
AC input brownout protection (BNO)
Protects system from damage due to ultra-low-line conditions
Open frame switching power supplies
Power delivery (PD) applications
Cell phone chargers
Set-top box (STB) power supplies
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