Microchip MCP1633 | Demoboard High Performance Cuk LED Driver

Beschreibung

Recent challenges in LED driving requirements created a demand for DC-DC converters with a high dynamicrange for their operating power levels, reduced voltage, current ripples, and high efficiency.The variable input voltage range, also present in automotive applications and high output voltage variations when switching between LED strings of different lengths or different types of LEDs, are constraints that make converter flexibility a mandatory feature. Other key aspects are reduced component count and low EMI.Considering the above requirements, the Cuk converter is a suitable choice for a constant current power supplyto power LED strings.The Cuk converter also offers capacitive isolation between input and output, as well as load protection in case any of the switching components fail, similar to SEPIC or ZETA converters.This topology offers buck-boost capability for situations where output voltage must switch below or above the input voltage (a typical situation occurs when the LED string length is decreased/increased).The following application note describes the implementation of two versions of a 20-30W DC-DC converter for LED driving, using MOSFET transistors and new-generation GaN transistors, paired with the MCP1633 low-side controller.The MCP1633 offers current PWM dimming capabilities, variable switching frequency, and the enable/disablefeature, if the converter is interfaced with a microcontroller.

Eigenschaften

• High Speed Current Mode Pulse-Width Modulator(PWM) Controller
• Easy to Interface with PIC® Microcontroller for Implementing High-Performance LED Drivers
• Integrated General Purpose Operational Amplifier that can be Used for Current Sensing
• Internal Oscillator with Adjustable Frequency via External Resistor
• External Synchronization Option for the Oscillator
• Internal Slope Compensation Circuit
• Current Sense to VEXT Response <120 ns Typical
• Internal Leading Edge Blanking Circuit for Current Sense Input
• Programmable Current Sense Offset
• Internal Reference Voltage Generator
• Soft Start Capability
• Internal Push-Pull MOSFET Driver with 1A Peak Current Capability
• Internal MOSFET Driver for Dimming/Load Disconnect
• Input Voltage Range: 3V to 5V
• Undervoltage Lockout Circuit
• Output Overvoltage Protection
• Output Short Circuit Protection
• Overtemperature Protection
• Small 16-Pin QFN 3 x 3 mm Package
• Passes Automotive AEC-Q100 Reliability Testing

Typische Anwendungen

• Switch Mode Power Supplies, Brick DC-DC Converters
• Cuk LED Driver

Weiterführende Informationen

• Datenblatt
• Produktseite des IC-Herstellers