The LD7539RGL is a low start-up current, current mode PWM controller from Leadtrend Technology. It is designed for high-performance, low standby power consumption switching power supplies. This controller is commonly used in applications like AC/DC adapters, open frame power supplies, and LED lighting.

Applications

• AC/DC Adapters: Powering devices like laptops, mobile phones, and other electronic gadgets.
• Open Frame Power Supplies: Used in various electronic equipment where a compact and efficient power supply is needed.
• LED Lighting: Providing efficient and regulated power to LED lighting systems.
• Standby Power Supplies: Maintaining a low power state for electronic devices when they are not in active use.
• Battery Chargers: Efficiently charging batteries in various applications.

Features

• Low Start-up Current: Minimizes power consumption during start-up.
• Current Mode PWM Control: Provides excellent line regulation and load regulation.
• Leading Edge Blanking: Eliminates false triggering caused by the turn-on spike of the power MOSFET.
• Frequency Jittering: Reduces EMI (Electromagnetic Interference) noise.
• Over Voltage Protection (OVP): Protects the circuit from overvoltage conditions.
• Over Current Protection (OCP): Protects the circuit from overcurrent conditions.
• Short Circuit Protection (SCP): Protects the circuit from short-circuit conditions.
• Under Voltage Lockout (UVLO): Prevents the controller from operating under low voltage conditions.

Benefits

• High Efficiency: Current mode control and low start-up current contribute to high power conversion efficiency.
• Reduced EMI Noise: Frequency jittering minimizes electromagnetic interference.
• Reliable Protection: Integrated protection features safeguard the circuit from damage.
• Low Standby Power: Meets stringent energy efficiency requirements.
• Cost-Effective Solution: Provides a good balance of performance and cost.

Additional Details

The LD7539RGL is designed to meet the demanding requirements of modern power supplies. It offers a range of features that improve efficiency, reduce EMI, and enhance reliability. Its integrated protection functions safeguard the circuit from common fault conditions. The device is typically used in flyback converter topologies.

Technical Specifications:

• Operating Voltage Range: Typically 8V to 28V (Consult Datasheet)
• Switching Frequency: 65 kHz (Typical)
• Start-up Current: Low, typically in the microampere range.
• Operating Temperature Range: -40°C to +85°C
• Package: SOT-26