UCC2807N

The UCC2807-3 is a programmable maximum duty cycle pwm controller, it has high speed and low power integrated circuits contains all of the control and drive circuitry required for off-line and DC-to-DC fixed frequency current mode switching power supplies with minimal external parts count. It is similar to the UCC3800 family, but with the added feature of a user programmable maximum duty cycle. Oscillator frequency and maximum duty cycle are programmed with two resistors and a capacitor,also features internal full cycle soft start and internal leading edge blanking of the current sense input.It turn-on Threshold is 4.3v and turn-off Threshold is 4.1v.

Features of the UCC2807-3 are:(1)User Programmable Maximum PWM Duty Cycle;(2)100A Startup Current;(3)Operation to 1MHz;(4)Internal Full Cycle;(5)Internal Leading Edge Blanking of Current Sense Signal;(6)1 Amp Totem Pole Output.

The absolute maximum ratings of the UCC2807-3 can be summarized as:(1)Supply Voltage(I_DD10mA):13.5v;(2)Supply Current:30mA;(3)OUT Current:±1A;(4)Analog Inputs (FB, CS):-0.3V to (V_DD + 0.3V);(5)Power Dissipation at TA +25  (N or J packages):1W;(6)Power Dissipation at TA +25 (D package):0.65W;(7)Storage Temperature :-65 to +150;(8)Junction Temperature:-65 to +150;(9)Lead Temperature (Soldering, 10 sec.):+300.All currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations and considerations of packages.

If you want to know more information such as the electrical characteristics about the UCC2807-3, please download the datasheet in www.seekic.com or www.chinaicmart.com .