DC3008A

Demonstration circuit DC3008A is a 60V 3A silent switcher synchronous step-up LED driver featuring the LT®8386. It drives a single string of LEDs at 500mA up to 45V when VIN is between 4V and 40V. It runs down to 4VIN with reduced ILED and can withstand VIN as high as 50V, but has overvoltage lockout set for 45V for this application. 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. 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 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. PWMTG high-side PWM MOSFET driver assists with short-circuit protection and versatility.

• DC3008A runs at 340KHz switching frequency
• Spread spectrum frequency modulation (SSFM) can be turned on with a simple jumper, reducing EMI
• Internally-generated PWM dimming frequency of 160Hz (operating, JP1 = INT, JP2 = INT R10 = 118Kohm)
• Efficiency (100% PWM DC) of 93% (12V VIN, 330KHz, 45V LEDs SSFM = OFF)
• OVLO over voltage lockout VIN of 45V (VIN enable turn-on (EN) rising 6.4V)

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