Analog Devices LT8386 | Demoboard DC3008A

Description

Demonstration circuit DC3008A is a 60V 3A Silent Switcher synchronous step-up LED driver featuring the LT8386. It drives a single string of LEDs at 500mA up to 45V when VIN is between 4V and 40V. It runs down to VIN with reduced ILED and can withstand VIN as high as 50V, but has overvoltage lockout (OVLO) set for 45V for this application. DC3008A runs at 340kHz switching frequency. Spread spectrum frequency modulation (SSFM) can be turned on with a simple jumper, reducing EMI. DC3008A comes with low EMI features including optimized layout, SSFM and input EMI filter.It is protected against both open and short LED conditions and reports the faults. The LT8386 boost converter has an input voltage range from 4V to 56V. Its internal synchronous 3.3A 60V switches allow up to 52V of LEDs (with adjusted FB resistors) on the output with room for over voltage protection and overshoot during an open LED event. It has adjustable switching frequency between 200kHz and 2MHz. It can be synchronized to an external source or programmed with SSFM for low EMI. The PWMTG high-side PWM MOSFET driver assists with short-circuit protection and versatility. LT8386 can be configured as a boost, boost-buck, or buck mode LED driver and maintain all of its low EMI, PWM dimming, and fault diagnostic features.

Features

• 2% LED Current Regulation
• 2.5% Output Voltage Regulation
• 50,000:1 PWM Dimming at 100Hz
• 512:1 Internal PWM Dimming
• Spread Spectrum Frequency Modulation
• Silent Switcher Architecture for Ultralow EMI
• Operates in Boost, Buck Mode and Buck-Boost Mode
• 4V to 56V Input Voltage Range
• Up to 52V LED String Voltage
• Adaptive Peak Switch Current Limit Up to 5A for Low VIN
• 200kHz to 2MHz with SYNC Function
• Analog or Duty Cycle LED Current Control
• Open/Short LED Protection and Fault Indication
• Small 28-Lead 4mm × 5mm LQFN Package
• AEC-Q100 Qualified for Automotive Applications

Typical applications

More information

• Datasheet
• IC product information