The SFL330 is a high-performance, high-power-factor flyback PWM controller designed for LED lighting applications. This IC uses transition mode (TM) operation to achieve high efficiency and low EMI. The SFL330 features programmable load overvoltage protection (Load OVP), which greatly simplifies system design. The IC also has built-in overload protection (OLP) with a 120ms debounce time, especially protecting the system during short-term load. The SFL330 will clear the external EA feedback network before the IC is powered on. The IC also has a soft-start control function during power-on. The SFL330 integrates a high-linearity analog multiplier to achieve low THD and high power factor. The restart timer is suitable for stand-alone applications. The IC also features minimum off-time and maximum frequency clamping to limit the power MOS Vds spike during LED output short circuit. In the SFL330, proprietary "frequency adjustment" helps improve THD performance while ensuring noise-free audio operation. The device integrates VCC overvoltage protection (VCC OVP) for improved system reliability. The SFL330 integrates undervoltage lockout (UVLO), overload protection (OLP), VCC overvoltage protection (OVP), load overvoltage protection (Load OVP), soft start, cycle-by-cycle current limiting (OCP), GD clamping, VCC clamping, and other functions and protection features. The SFL330 is available in SOP-8 and DIP-8 packages.

◆ Programmable Load Overvoltage Protection (Load Overvoltage Protection)

◆ Built-in overload protection (OLP), 120ms debounce time

◆ Built-in soft start

◆ Extremely low inrush current

◆ Undervoltage lockout with 8V hysteresis

◆ VCC overvoltage protection (OVP)

◆ Clear external EA feedback network before power-up

◆ Transition Mode (TM) operation

◆ High linearity analog multiplier

◆ Proprietary 'frequency shaping' for higher PF and lower THD

◆ 3.3µs minimum OFF time

◆ 270kHz maximum frequency clamp

◆ 1.5% internal voltage reference

◆ Restart timer for independent applications

◆ Cycle-by-cycle current limit

◆ Built-in leading edge blanking (LEB)

◆ Audio noise-free operation

◆ Wide VCC voltage range from 10V to 32V

◆ 800mA drive capability

Applications

◆ LED lighting applications

◆ Single-stage high PF flyback AC/DC SMPS