Current-mode PWM controller for flyback and forward converters
The MAX5094BASA+ is a current-mode PWM controller from Analog Devices, designed for step-up/step-down topologies including flyback and forward converters. It drives a single transistor output and supports positive output configurations with isolation capability, making it a fit for isolated DC-DC supplies in industrial and automotive-grade systems. Switching frequency is programmable from 10 kHz to 500 kHz via an external resistor, with a maximum duty cycle clamped at 49.8% — that 50% ceiling is deliberate for forward-converter transformer reset, so you don't get core saturation on the reset cycle.
Supply range, temperature grade, and package
Operating from a 7.6 V to 30 V supply (Vcc/Vdd), the controller handles unregulated rails common in 12 V and 24 V industrial buses. Housed in an 8-pin SOIC (0.154" width, 3.90 mm body), the surface-mount package suits compact PCB layouts. The tube packaging aligns with low-to-medium volume production runs where tape-and-reel isn't justified.
Control features and output drive
The controller includes a frequency control pin for external synchronization or frequency adjustment, and it does not integrate clock sync or synchronous rectification — the designer adds those externally if needed. The transistor driver output directly drives an external MOSFET or bipolar switch. With a single output phase and no internal synchronous rectifier, this is a straightforward controller for moderate-power isolated supplies where the bill-of-materials cost and simplicity matter more than peak efficiency at light load.