Forward converter controller with active-clamp timing
The Texas Instruments LM5025MTC/NOPB is a current-mode PWM controller built for forward converters, supporting both step-up and step-down regulation. Its 200kHz to 580kHz switching range lets the designer trade transformer size against switching losses — higher frequency shrinks the magnetics but pushes gate-drive losses. Two transistor-driver outputs with an 80% maximum duty cycle are configured for active-clamp reset, which recovers transformer core energy and improves efficiency over a conventional RCD clamp. The controller integrates dead-time control, frequency control, ramp compensation, and a soft-start pin. Clock synchronization is on-board — multiple LM5025 units can be interleaved to reduce input/output ripple, or the controller can lock to an external clock for system-level noise management.
Supply rails and temperature grade
Bias supply range is 8V to 15V, typical for a telecom or industrial backplane rail. Packaged in a 16-TSSOP with 4.40mm body width, the footprint is compact enough for a 2-layer board if the thermal pad is stitched to a ground plane. No synchronous rectifier output is integrated — the external SR FET must be driven from the secondary side or from an auxiliary winding.
Lifecycle and compliance
The tube packaging is the standard delivery form for this variant. If reel-fed assembly is preferred, check the LM5025MTCX/NOPB tape-and-reel sibling.