led恒流驱动ic lm3402

general description
the lm3402/02hv are monolithic switching regulators designed
to deliver constant currents to high power leds. ideal
for automotive, industrial, and general lighting applications,
they contain a high-side n-channel mosfet switch with a
current limit of 735 ma (typical) for step-down (buck) regulators.
hysteretic control with controlled on-time coupled with
an external resistor allow the converter output voltage to
adjust as needed to deliver a constant current to series and
series - parallel connected arrays of leds of varying number
and type, led dimming by pulse width modulation (pwm),
broken/open led protection, low-power shutdown and thermal
shutdown complete the feature set.
features
n integrated 0.5a n-channel mosfet
n vin range from 6v to 42v (lm3402)
n vin range from 6v to 75v (lm3402hv)
n 500 ma output current over temperature
n cycle-by-cycle current limit
n no control loop compensation required
n separate pwm dimming and low power shutdown
n supports all-ceramic output capacitors and
capacitor-less outputs
n thermal shutdown protection
n msop-8 package
applications
n led driver
n constant current source
n automotive lighting
n general illumination
n industrial lighting