What this PWM controller does
The Texas Instruments LM5030MMX/NOPB is a current-mode PWM controller built for isolated topologies — full-bridge, half-bridge, and push-pull. It drives two transistor-driver outputs at a fixed 50% maximum duty cycle per phase, making it a natural fit for DC-DC converters that need transformer isolation and a regulated output on the secondary side. The 14V to 90V supply range covers industrial 24V, 48V, and 72V rails without an external pre-regulator.
Switching frequency — 200 kHz or 600 kHz
The oscillator is set to either 200kHz or 600kHz via a single resistor. At 200 kHz you get lower switching losses and can push more output power with larger magnetics; at 600 kHz the transformer and output filter shrink, saving board space at the cost of higher core and gate-drive losses. Pick the frequency that matches your efficiency target and available core sizes.
Temperature grade and environment
Rated for -40°C to 105°C ambient, the LM5030MMX/NOPB is specified for industrial environments — motor drives, outdoor telecom rectifiers, factory-automation power supplies, and engine-bay converters that see elevated temperatures but not the full military range.
Control features and output configuration
On-chip soft start limits inrush during startup, and frequency control lets the designer synchronise multiple controllers or spread the EMI spectrum. The outputs are positive-going and isolation-capable — meaning the controller drives a transformer primary through external FETs, with the secondary side regulated via an optocoupler or auxiliary winding. No synchronous rectifier drive is included; the secondary rectification is handled externally.
Package and mounting
Supplied in a 10-lead VSSOP (MSOP-10, 3.00 mm body width) for surface-mount assembly. Cut Tape is available for prototyping or low-volume builds.
Lifecycle and sourcing
TI lists this part as Active and ROHS3 compliant.