97% duty cycle PWM controller for multi-topology converters
The Texas Instruments TL594INSRG4 is a fixed-frequency PWM controller that supports buck, boost, flyback, forward, half-bridge, full-bridge, and push-pull topologies. It delivers a maximum duty cycle of 97%, which means the output can stay high nearly the entire switching period — critical for low-dropout boost or buck designs where the input and output voltages are close.
The controller operates from a 7 V to 40 V supply, covering 12 V, 24 V, and 36 V industrial and automotive bus rails. The 7 V minimum means it cannot run directly from a 5 V rail — a separate bias supply or a higher-voltage startup circuit is needed.
Package and sourcing
The base product number is TL594.