PWM IC Drives Offline LEDs

The HV9931 is a fixed-frequency, pulse-width-modulated (PWM), offline LED driver IC with built-in power factor correction (PFC). It is designed to control an LED lamp drive using a proprietary single-stage, single-switch topology. An internal 450V regulator allows the device to run directly from a high-voltage input (rectified 85 Vac to 265 Vac), eliminating the need for extra components and simplifying the drive circuit design. The device uses peak current control to regulate both input and output currents, so there is no need for loop compensation in LED drive circuit designs. The device’s topology permits the use of non-electrolytic capacitors, improving end-product reliability. Built-in phase dimming enables the use of standard wall dimmers to adjust LED brightness. The device is available in an 8-pin SOIC package and an 8-pin DIP. Pricing is $0.91 each/1,000. SUPERTEX INC., Sunnyvale, CA. (800) 222-9883.