Help! I am clearly missing something. I copied the universal charger circuit from SLVA464C with a variable Rlim and created the attached circuit. I cannot get the charging current to exceed 500 mA. I've plugged into various cell phones and an iPod and the two lower current settings behave as expected - ~100mA and ~500mA, but the high current setting does not. The 5V source is not current-limited. It pushes 2A easily.
Any help on where to look would be greatly appreciated.
Thanks.