FAN100

FAN100 — Primary-Side-Control PWM Controller August 2008 FAN100 Primary-Side-Control PWM Controller Features ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ Constant-Voltage (CV) and Constant-current (CC) Control without Secondary-feedback Circuitry Green Mode PWM Frequency Linearly Decreasing Fixed PWM Frequency at 42kHz with Frequency Hopping to Solve EMI Problem Low Startup Current: 10μA Low Operating Current: 3.5mA Peak-Current-Mode Control in CV Mode Cycle-by-Cycle Current Limiting VDD Over-Voltage Protection with Auto-Restart VDD Under-Voltage Lockout (UVLO) Gate Output Maximum Voltage Clamped at 18V Fixed Over-temperature Protection with Latch SOP-8 Package Available Description This highly integrated PWM controller, FAN100, provides several features to enhance the performance of low-power flyback converters. The proprietary topology enables simplified circuit design for battery charger applications. A low-cost, smaller, and lighter charger results when compared to a conventional design or a linear transformer. The startup current is only 10µA, which allows use of 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 meeting the power conservation requirements. Using FAN100, a charger can be implemented with fewest external components and minimized cost. A typical output CV/...