IR2184 Half Bridge HELP

Hello All,

I am trying to get the IR2184 half bridge to work with an Arduino PWM with no luck. I am using the IR2184 because I had found a link in the forum What are some good motor controllers for two wheelchair motors ? - Motors, Mechanics, Power and CNC - Arduino Forum that shows a working circuit. I tried hooking the half bridge up like this with no luck. For some reason I get full power out of the LO all the time and I get full Power out of HO for a split second with and without pwm going to the INPUT. (Its like the LO and HO are stuck on) I also tried the circuit that is on the datasheet and I get the same exact output. I have it hooked up as followed...

VCC=12 volts
IN=Arduino PWM
SD=Not Hooked Up
COM=Ground(Arduino and 12v Ground)

Resistors=4.7ohm
Diode=1N4936
Fets=IRF1405
Capacitor=Will get the part number

When I initially plug the led in its bright for a split second and then its like the capacitor drains if I unplug it and plug it in again its bright for a split second then dim. What I don't understand is why its doing anything if I don't have PWM going in. When I do have PWM going in it acts the exact same. Do I have something hooked up incorrectly? Also If I hook up the negative end of an led to LO and positive end to 12v its really bright. If I hook up the positive end of an led to HO and negative end to ground its bright for a split second then dim. With the leds hooked up like this if I send pwm to the ir2184 nothing changes.

If there is anything else I didn't mention let me know. I just want this thing to respond to pwm and right now it is not. Thank You

IR2184 Datasheet
http://www.irf.com/product-info/datasheets/data/ir2184.pdf

You must hook up the shutdown pin to Arduino Vcc - never leave inputs undefined unless
the datasheet says its OK. Its an active low logic pin, so wire the the Arduino's Vcc, or an
Arduino pin.

Unless you feed PWM or input LOW, it will not work - you cannot leave the input
HIGH for any length of time (< few ms usually).

Your LED is wired in the wrong place and without a current limiting resistor. Follow the
datasheet diagram exactly, and keep the layout neat and tight and make sure you have
lots of decoupling (at least 20 times the bootstrap capacitor value, ceramic and close
up to the chip). The bootstrap capacitor should be around 10 to 20 times the MOSFET
input effective capacitance.

The load of the circuit goes from the common point (they must be commoned) of the two MOSFETs to either GND
or motor V+. Motor V+ can be any value from 0V to 600V with this chip, The Vcc
pin should be at 12V (it is not the same as the load's supply). Its a decoupling nightmare
to power Vcc from the load supply if the load is a motor - don't do this, use a separate
12V supply to the driver, it has to be vaguely clean.

Note this style of driver isolates(*) the driver supply from the load, so you can
independantly power up and down the driver and the load without issue.

(*) upto 600V, grounds are common.

And if you're only intending to drive an LED, this is not the device to use.

Thank you for replying... I am planning to eventually drive a motor with this. The led is for testing only so I don't burn anything up. I went to school for computer programming but enjoy messing with electrical stuff. Are you saying SD pin can go to the 5v pin of the arduino (So it would be high) and then I can use the PWM from the arduino and the led should brighten or dim.

Also when you say input low does that mean ground? and high means 5v?

I appreciate you responding.

THANK YOU...