LT3922 Buck Mode Schematic

Question

Hi, 
 The schematic for a buck mode LED driver written in LT3922 datasheet page 27 seems not correct. 
 I tried this schematic on LTspice but I could not get correct data. LT3922 seems not to work since VIN=VSW and ILED=0A. 
 If it is not correct, please send your recommended schematic for a buck mode. 
 
 Thanks, 
 Kazu

ADIApproved · Accepted Answer

LT3518_Buck-Conveter_CC.asc 
 
 Hello Kazu, 
 Please see the schematic, and tell us your feedback. 
 Vin: 3.3V to 5V 
 Note that the LED used has a Vf of ~3V. The schematic will regulate the LED current at 1.5A regardless of the forward voltage of the LED, given that Vinput > Vf. 
 Thanks)

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LT3922 Buck Mode Schematic