LM3407,pdf,Constant Current Ou

The LM3407 is a constant current output floating buck switching
converter designed to provide constant current to high
power LEDs. The device is ideal for automotive, industrial and
general lighting applications. The LM3407 has an integrated
power N-MOSFET that makes the application solution compact
and simple to implement. An external 1% thick-film resistor
allows the converter output voltage to adjust as needed
to deliver constant current within 10% accuracy to a serially
connected LED string of varying number and type. Converter
switching frequency is adjustable from 300 kHz to 1 MHz. The
LM3407 features a dimming input to enable LED brightness
control by Pulse Width Modulation (PWM). Additionally, a
separate enable pin allows for low power shutdown. An exposed
pad eMSOP-8 package provides excellent heat dissipation
and thermal performance. Input UVLO and output
open-circuit protection ensure a robust LED driver solution.