MAX256ASA

The MAX256ASA is an integrated primary-side controller and H-bridge driver designed for isolated power supply circuits. It provides up to 3W of power to the primary winding of a transformer. The device supports single supply operation from +5V or +3.3V and includes essential system protection features such as undervoltage lockout for controlled startup and thermal shutdown circuitry to prevent damage from overtemperature conditions.

The MAX256ASA can utilize an internal programmable oscillator or be driven by an external clock for improved EMI performance. An internal flip-flop stage ensures a fixed 50% duty cycle, preventing DC current flow in the transformer. It prevents cross-conduction of H-bridge MOSFETs through break-before-make switching.

This component is available in an 8-pin thermally-enhanced SO package and is specified for the automotive temperature range of -40°C to +125°C. Its flexible design makes it suitable for applications like isolated power supplies, industrial process control, isolated communications links, medical equipment, and telecommunications.

Key features include single supply operation, internal resistor-programmable oscillator mode, external clock mode with watchdog, and a disable mode. The compact 8-pin SO-EP package saves board space.