Richtek RT8462

Description

The RT8462 is a current mode PWM controller designed to drive an external MOSFET for high current LED applications. With a current sense amplifier threshold of 190mV, the LED current is programmable with one external current sense resistor. With the maximum operating input voltage of 36V and output voltage up to 60V, the RT8462 is ideal for buck, boost or buck-boost operation.

With the switching frequency programmable over 100kHz ton 1MHz the external inductor and capacitors can be small while maintaining high efficiency.

Dimming can be done by either analog or digital. A built-in clamping comparator and filter allow easy low noise analog dimming conversion from digital signal with only one external capacitor.

The RT8462 is available in SOP-14 and WQFN-16L 3x3 packages.

Features

• High Voltage Capability : VIN Up to 36V, LED Sensing Threshold Common Mode Voltage Up to 60V
• Buck, Boost or Buck-Boost Operation
• Programmable Switching Frequency
• Easy Dimming Control : Analog or Digital Converting to Analog with One External Capacitor
• Programmable Soft-Start to Avoid Inrush Current
• Programmable Over Voltage Protection
• VIN Under Voltage Lockout and Thermal Shutdown
• RoHS Compliant and Halogen Free

Typical applications

• Desk Lights and Room Lighting
• Building and Street Lighting
• Industrial Display Backlight
• General Industrial High Power LED Lighting

More information

• Datasheet
• IC product information