FSEZ1016A: Primary-Side Regulation PWM with Power MOSFET Integrated

This highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters. The proprietary topology of FSEZ1016A enables simplified circuit design especially for battery-charger applications. A low-cost, smaller, and lighter charger is the result when compared to a conventional design or a linear transformer. The startup current is only 10µA, which allows large startup resistance for further power saving.

To minimize the standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease PWM frequency under light-load conditions. This green mode function assists the power supply in meeting power conservation requirements.

By using FSEZ1016A, a charger can be implemented with few external components and minimized cost.     FSEZ1016A series controller is available in the 7-pin SOIC package.

Features

• Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry
• Accurate Constant Current Achieved by Fairchild’s Proprietary TRUECURRENT® Technique
• Green-Mode Function: PWM Frequency Linearly Decreasing
• Fixed PWM Frequency at 42kHz with Frequency Hopping to Solve EMI Problems
• Cable Compensation in CV Mode
• Low Startup Current: 10µA
• Low Operating Current: 3.5mA
• Peak-Current-Mode Control in CV Mode
• Cycle-by-Cycle Current Limiting
• V_DD Over-Voltage Protection (OVP) with Auto-Restart
• V_DD Under-Voltage Lockout (UVLO)
• Fixed Over-Temperature Protection (OTP) with Latch
• SOIC-7 Package Available

Application Notes