The UCC2897 PWM controller simplifies implementation of the various active clamp/reset
and synchronous rectifier switching power
topologies.
Based on the UCC2891 active-clamp controller
the UCC2897 is a peak current-mode, fixed-frequency,
high-performance pulse width modulator.
It includes the logic and the drive capability for the
P-channel auxiliary switch along with a simple
method of programming the critical delays for
proper active clamp operation.
Features include an internal programmable slope
compensation circuit, precise DMAX limit, and a
synchronizable oscillator with an internal timing
capacitor. An accurate line monitoring function
also programs the converter's ON and OFF
transitions with regard to the bulk input voltage.
The UCC2897 adds a second level hiccup mode
current sense threshold, bi-directional
synchronization and the input overvoltage
protection functionalities that are not available on
the 16-pin UCC2891. The UCC2897 is offered in
20-pin TSSOP (PW) and 20-pin QFN (RTJ)
package.
The UCC2897 PWM controller simplifies implementation of the various active clamp/reset
and synchronous rectifier switching power
topologies.
Based on the UCC2891 active-clamp controller
the UCC2897 is a peak current-mode, fixed-frequency,
high-performance pulse width modulator.
It includes the logic and the drive capability for the
P-channel auxiliary switch along with a simple
method of programming the critical delays for
proper active clamp operation.
Features include an internal programmable slope
compensation circuit, precise DMAX limit, and a
synchronizable oscillator with an internal timing
capacitor. An accurate line monitoring function
also programs the converter's ON and OFF
transitions with regard to the bulk input voltage.
The UCC2897 adds a second level hiccup mode
current sense threshold, bi-directional
synchronization and the input overvoltage
protection functionalities that are not available on
the 16-pin UCC2891. The UCC2897 is offered in
20-pin TSSOP (PW) and 20-pin QFN (RTJ)
package.