IR2184 Half Bridge HELP

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hello all,

i trying ir2184 half bridge work arduino pwm no luck.  using ir2184 because had found link in forum http://forum.arduino.cc/index.php?topic=84062.0 shows working circuit.  tried hooking half bridge no luck. reason full power out of lo time , full power out of ho split second , without pwm going input. (its lo , ho stuck on)  tried circuit on datasheet , same exact output.  have hooked followed...

vcc=12 volts
in=arduino pwm
sd=not hooked up
com=ground(arduino , 12v ground)

resistors=4.7ohm
diode=1n4936
fets=irf1405
capacitor=will part number

when plug led in bright split second , capacitor drains if unplug , plug in again bright split second dim.  don't understand why doing if don't have pwm going in.  when have pwm going in acts exact same.  have hooked incorrectly?  if hook negative end of led lo , positive end 12v bright.  if hook positive end of led ho , negative end ground bright split second dim. leds hooked if send pwm ir2184 nothing changes.

if there else didn't mention let me know.  want thing respond pwm , right not. thank you

ir2184 datasheet
http://www.irf.com/product-info/datasheets/data/ir2184.pdf

you _must_ hook shutdown pin arduino vcc - never leave inputs undefined unless
the datasheet says ok.  active low logic pin, wire the arduino's vcc, or an
arduino pin.

unless feed pwm or input low, not work - cannot leave input
high length of time (< few ms usually).

your led wired in wrong place , without current limiting resistor.  follow the
datasheet diagram exactly, , keep layout neat , tight , make sure have
lots of decoupling (at least 20 times bootstrap capacitor value, ceramic , close
up chip).  bootstrap capacitor should around 10 20 times mosfet
input effective capacitance. 

the load of circuit goes common point (they _must_ commoned) of 2 mosfets either gnd
or motor v+.   motor v+ can value 0v 600v chip, vcc
pin should @ 12v (it not same load's supply).  decoupling nightmare
to power vcc load supply if load motor - don't this, use separate
12v supply driver, has vaguely clean.

note style of driver isolates(*) driver supply load, can
independantly power , down driver , load without issue.

(*) upto 600v, grounds common.

and if you're intending drive led, not device use.


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > IR2184 Half Bridge HELP


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