UCC35701N

The UCC35701N from Texas Instruments is an advanced voltage mode pulse width modulator (PWM) IC intended for isolated switching power supplies. It is suitable for both off-line applications and DC/DC converter designs, including distributed power systems and telecom power sources.

This device features a switching frequency of 700kHz and operates within a supply voltage range of 9V to 15V, with a maximum duty cycle of 99%. It includes integrated features such as voltage feed-forward compensation, an accurate volt-second clamp, and a maximum duty cycle limit. Fault protection is provided through pulse-by-pulse current limiting and the ability to latch off after a programmable number of repetitive faults.

The UCC35701N is available in a 14-PDIP package and is designed for through-hole mounting. Its operating temperature range is -55°C to 150°C (TJ). The IC supports various topologies including Boost, Buck, Flyback, and Forward configurations, offering isolated output.

Key control features include soft start and synchronization capabilities. The device also offers features like optocoupler interface and fault counting shutdown or automatic shutdown. Its low startup current allows for efficient off-line starting, while its output drive is sufficient to switch power MOSFETs in excess of 500kHz.