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.
1 Preheat oven to 425 degrees F for 15 minutes. 2  Place the roast in the oven and immediately reduce the temperature down to 200 degrees F. 3  Roast for about 4 hours or until the meat is falling-apart tender (cooking time will vary depending on the size of the roast). Place the roast in the oven and immediately reduce the temperature down to 200 degrees F. 2  Roast for about 4 hours or until the meat is falling-apart tender (cooking time will vary depending on the size of the roast). 3  Stir the salt and black pepper into the juice (do not omit the salt!).