ISSI IS31LT3353 | Demoboard IS31LT3353_EB

Description

The IS31LT3353 is a continuous mode inductive step-down converter, designed for driving a single LED or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 6V and 40V and provides an externally adjustable output current of up to 1A. Depending upon supply voltage and external components, this can provide up to 30 watts of output power. The IS31LT3353 includes an integrated output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. Output current can be adjusted linearly by applying an external control signal to the ADJ pin. The ADJ pin will accept either a DC voltage or a PWM waveform. This will provide either a continuous or a gated output current. Applying a voltage of 0.2V or lower to the ADJ pin turns the output off and switches the chip into a low current standby state.

Features

• Internal 40V power switch
• Wide input voltage range: 6V to 40V
• Up to 1A output current
• High efficiency (up to 98% )
• Typical 1200:1 dimming rate
• Typical 3% output current accuracy
• Single pin on/off and brightness control using DC voltage or PWM
• Inherent open-circuit LED protection
• Thermal shutdown protection circuitry

Typical applications

• LED MR16, MR11 spot light, LED street light, PAR light, Industrial lighting, Refrigeration lights, Other LED lighting

More information

• IC product information