FL7701 is an intelligent LED lamp integrated driver with PFC function. It uses digital control algorithm and has internal self-bias voltage circuit and stable UVLO circuit. FL7701 also has an intelligent internal circuit that can automatically change the internal reference voltage to adapt to input voltage conditions. The device also has a soft-start function to reduce the surge current during power-up. In the application circuit, the diode rectifier bridge stage does not use electrolytic capacitors. The system design requirements will generate high pulse waveforms.
The FL7701 is a PWM peak current controller designed for buck converters operating in continuous conduction mode (CCM). It features an integrated Power Factor Correction (PFC) function using digital control algorithms to achieve high power factor without requiring external components or additional pins. The device includes an internal self-protected circuit to protect high-voltage devices connected to the HV pin. This manual is written in Chinese.
| Output LED Current (RMS) | 0.3A |
|---|---|
| Minimum Duty Cycle | 2% |
| Maximum Duty Cycle | 50% |
No, the device has an intelligent internal PFC function that generally does not require additional pins or extra components.
The device can accept input voltages up to 400V peak for AC or 311V for DC.
When the RT pin is left open, the output frequency is approximately 45kHz.
The maximum duty cycle is limited to 50% to prevent subharmonic instability.