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LM3424: LM3424 SEPIC Feasibility check

Part Number: LM3424

Hi team,

My customer is evaluating new project which is applied in 24V DRL, 

We concern that the maximum output voltage is 34.4V and the minimum input voltage is 8V, (6~8V is with current derating) Vout is almost 4.3 times (34.4V/8V=4.3) of input voltage ratio.

Is it workable for this operation? What is the maximum duty cycle of LM3424?

Would you please help to check if LM3424 design with SEPIC topology is feasible or not? Thank you.

Below is operating condition:

l   DRL/POL/TI functional modes: continuously ON with full power (DRL), dimmed to 10% with PWM (POL), and blinking (TI) with full power.

l   LED driver: LM3424

l   Topology: SEPIC, switching frequency: 250K~350KHz

l   Input voltage range for the driver: 6V to 32V

l   Output voltage range (per string): 27V to 34.4V

l   Maximum LED currents (per string): 850mA

l   Temperature range: -40°C to 105°C ambient temperature.