The HV9910B includes a PWM dimming input that can accept an external control signal with a duty ratio of 0 - 100% and a frequency of up to a few kilohertz. It also includes a 0 - 250mV linear dimming input which can be used for linear dimming of the LED current. The HV9910B is ideally suited for buck LED drivers.
The oven temperature used to cook a beef roast is usually set somewhere between 300 degrees and 450 degrees Fahrenheit. The recommended cooking temperature for your roast is usually determined by the type of beef cut that you plan to roast.
4) Place the beef in a roasting pan, and put it in the oven, uncovered. Timing is Everything. 1) Cook the roast for 15 minutes at 500 degrees F. 2) After 15 minutes, turn the temperature down to 375 degrees F. 3) Continue cooking for 16 minutes per pound (ex: If your roast is 3 pounds, that would be 48 minutes). 4) Remove from oven, and place pan on a cooling rack.