The AP3845CMTR-E1 is a high-performance, fixed-frequency current-mode PWM controller manufactured by BCD Semiconductor Manufacturing Limited. It is designed for off-line and DC-DC converter applications, offering a cost-effective solution with minimal external components. This controller integrates comprehensive protection features, ensuring reliable operation in various operating conditions.

Applications:

• Power adapters for laptops and mobile devices
• Open-frame power supplies
• Battery chargers
• LED lighting power supplies
• Standby power supplies

Features:

• Fixed frequency operation (typically 65kHz)
• Current-mode control for improved transient response and simplified feedback loop design
• Low startup current (typically 20μA)
• Over-voltage protection (OVP) with auto-restart
• Over-current protection (OCP) with cycle-by-cycle current limiting
• Over-temperature protection (OTP) with auto-restart
• Under-voltage lockout (UVLO) with hysteresis
• Leading edge blanking
• Internal slope compensation
• Gate drive capability of up to 500mA

Benefits:

• High efficiency: The fixed frequency operation and current-mode control contribute to high efficiency in power conversion.
• Reliable operation: Comprehensive protection features such as OVP, OCP, and OTP ensure robust and reliable performance in various operating conditions.
• Cost-effective solution: The integrated features minimize the need for external components, reducing overall system cost.
• Simplified design: Current-mode control simplifies the feedback loop design process.
• Low standby power consumption: The low startup current helps to reduce standby power consumption.

Additional Details:

The AP3845CMTR-E1 is available in a SOT-23-6 package. It operates over a wide input voltage range. The internal slope compensation helps to prevent sub-harmonic oscillations at higher duty cycles. This device is suitable for applications requiring high power density and efficiency. The device's gate drive output is optimized to drive a MOSFET, providing a direct interface for power switching.