Freescale Semiconductor S08 manual Equations for Boost Converter

Page 21

LED Driver Design Procedures

Figure 2-4. Equations for Boost Converter

Vsat = Saturation voltage of the output switch.

VF = Forward voltage drop of the output rectifier.

Vin - Nominal input voltage.

Vout - Desired output voltage.

Iout - Desired output current.

fmin - Minimum desired output switching frequency.

Vripple(pp) - Desired peak-to-peak output ripple voltage.

For further information, refer to On Semiconductor’s datasheet.

LED Lighting Control using the MC9S08AW60, Rev. 1

Freescale Semiconductor

21

Image 21

Contents LED Lighting Control Using the MC9S08AW60 Page LED Lighting Control using the MC9S08AW60 Revision HistoryDesigner Reference Manual Freescale Semiconductor Table of Contents Appendix a Schematics Appendix B Bill of Materials Features Chapter IntroductionIntroduction System Overview MC9S08AW60Devices in the MC9S08AW60/48/32/16 Series Peripherals Available per Package Type Introduction LED Lighting Control using the MC9S08AW60, Rev AW60 Control Board Chapter Hardware DescriptionDEMO9S08AW60LED Layout DEMO9S08AW60LED FeaturesReset Switch PowerDevelopment Support Clock SourceLED Indicators Pushbutton SwitchesUser Options ADC InterfaceIIC Port Other I/O ConnectorsSCI Port SPI PortPWM Port LED Light Box Interface10. Sensor Interface Type a 12. Temperature Sensor Input 11. Sensor Interface Type H13. User Assignable Input LED Driving Board RGB LED Chip LED Driver Design ProceduresBoost Converter Current Sense ResistorEquations for Boost Converter Freescale Semiconductor Firmware Flow Main Program Chapter Firmware DescriptionFirmware Flow PWM Adjustment PC Control ModeUser Interface Menu Standalone Mode Firmware Files Freescale Semiconductor Hardware and Software Setup Chapter Demo SetupHardware Setup PC Software SetupEcho Typed Characters Setting Demo 1 Demonstration Display Demo ExamplesDemo 3 Auto White Balance Control Demo 2 Preset Colors DisplayDemo 4 PWM Output Frequency Control Demo 5 Full Manual ControlProgram the MCU Flash TroubleshootingDemo Setup Appendix a Schematics LED Lighting Control using the MC9S08AW60, Rev LED Lighting Control using the MC9S08AW60, Rev LED Lighting Control using the MC9S08AW60, Rev LED Lighting Control using the MC9S08AW60, Rev LED Lighting Control using the MC9S08AW60, Rev Appendix B Bill of Materials Part Description Quantity Value Designators BOM for AW60 Control BoardValue Designators BOM for LED Driving BoardLED Lighting Control using the MC9S08AW60, Rev Page How to Reach Us