Analog Devices LT3922 | Demoboard DC2247A

Beschreibung

Demonstration circuit DC2247A is a 36V 2A synchronous 2MHz boost LED driver featuring the LT®3922. It drives a single string of LEDs at 330mA up to 34V when VIN is between 7V and 28V. It runs down to 4VIN with reduced ILED and can withstand VIN as high as 36V, but has overvoltage lockout (OVLO) set for 28V for this application. DC2247A runs at 2MHz switching frequency. Spread spectrum frequency modulation (SSFM) can be turned on with a simple jumper, reducing EMI. DC2247A comes with low EMI features including optimized layout, SSFM, and input and output filters. It passes CISPR 25 class 5 conducted and radiated EMI. It is protected against both open and short LED conditions and reports the faults.

Eigenschaften

• ±2% LED Current Regulation
• ±2% Output Voltage Regulation
• 5000:1 PWM Dimming at 100Hz
• 128:1 Internal PWM Dimming
• Spread Spectrum Frequency Modulation
• Silent Switcher® Architecture for Low EMI
• Operates in Boost, Buck Mode and Buck-Boost Mode
• 2.8V to 36V Input Voltage Range
• Up to 34V LED String Voltage
• 2A, 40V Internal Switches
• 200kHz to 2MHz with SYNC Function
• Analog or Duty Cycle LED Current Control
• Open/Short LED Protection and Fault Indication
• Thermally Enhanced 28-Lead (4mm × 5mm) QFN

Typische Anwendungen

• Machine Vision
• Automotive and Industrial Lighting

Weiterführende Informationen

• Datenblatt
• Produktseite des IC-Herstellers