The SD6601ASTR is a highly integrated offline PWM power switch with high precision CV/CC control particularly well-suited for battery charger applications and AC/DC adapters. It incorporates a power MOSFET, a high-voltage start-up circuit, and a complete suite of protection features.
Applications:
- Battery Chargers for Mobile Phones and Tablets
- AC/DC Adapters for Consumer Electronics
- Standby Power Supplies
- LED Lighting Drivers
Features:
- Integrated High-Voltage Power MOSFET
- High Precision Constant Voltage (CV) and Constant Current (CC) Control
- Primary-Side Regulation (PSR) – Eliminates Optocoupler
- Low Standby Power Consumption (<70mW)
- Built-in Soft Start
- Frequency Jittering for Improved EMI Performance
- Over-Voltage Protection (OVP)
- Over-Current Protection (OCP)
- Short-Circuit Protection (SCP)
- Over-Temperature Protection (OTP)
Benefits:
- Simplified Design: Primary-side regulation eliminates the need for an optocoupler, reducing component count and BOM cost.
- High Efficiency: Integrated MOSFET and optimized control scheme ensure high efficiency across a wide load range.
- Accurate CV/CC Control: Provides precise constant voltage and constant current regulation for optimal battery charging and adapter performance.
- Low Standby Power: Minimizes power consumption in standby mode, meeting stringent energy efficiency requirements.
- Robust Protection: Comprehensive protection features ensure reliable operation and prevent damage to the power supply and connected devices.
- Improved EMI Performance: Frequency jittering reduces electromagnetic interference, simplifying compliance with EMI standards.
The SD6601ASTR achieves primary-side regulation (PSR) by precisely sampling the output voltage and current information from the primary winding of the transformer. This eliminates the need for an optocoupler, significantly reducing the BOM cost and design complexity. The integrated high-voltage start-up circuit allows for quick start-up and low standby power consumption. The CV/CC control ensures accurate output voltage and current regulation, critical for battery charging applications.
Technical Specifications (Typical):
- Input Voltage Range: 85VAC to 265VAC
- Output Power: Up to 7W (depending on application conditions)
- Switching Frequency: 65kHz
- Standby Power Consumption: <70mW
- Operating Temperature: -40°C to +85°C
- Package: SOP-7
