Infineon Technologies IRS2982S | Demoboard IRXPSU1

Description

The IRS2982S is a versatile SMPS controller IC primarily intended for LED drivers in the 5 to 100 W power range suitable for buck, buck-boost and flyback converters operating in Critical Conduction Mode (CrCM) and Discontinuous Conduction Mode (DCM) at light loads. Flyback converters will be covered in this application note focusing on an isolated voltage-regulated design with Power Factor Correction (PFC).All of the control and protection required for the converter is integrated in the IRS2982S as well as a HV start-up cell to enable rapid illumination at switch-on over a wide line input voltage range. The IRS2982S is also able to provide PFC in a single-stage flyback converter able to meet class C (lighting) line current harmonic limits of the EN 61000-3-2 standard.A 36 W multiple-output isolated constant voltage-regulated PFC flyback evaluation board based on the IRS2982S controller is described in detail in this application note and detailed test results are presented.

Features

• High voltage fast startup
• Voltage mode control
• Critical-conduction / transition mode operation
• High power factor
• Constant voltage / current regulation
• Minimum off time (DCM at light load)
• Burst mode operation at very light load
• Cycle by cycle over-current protection
• Open load over voltage protection
• Micro-power startup (50µA)
• Low quiescent current
• Latch immunity and ESD protection
• Noise immunity

Typical applications

• Lighting LED

More information

• Datasheet
• IC product information