IRAC11688 Daughter Cards Infineon Technologies IRAC11688 Daughter Cards enable easy retrofits in existing systems with minimal system changes. These daughter cards are designed for the IR11688S Smartrectifier™ controller IC and are available in surface-mount DPAK and QFN packages. Infineon Technologies IRAC11688 Daughter Cards feature a resonant half-bridge topology and are ideally suited for power supply applications.