Controller extends performance of fixed-frequency switched-mode converters

Power supply designers seeking an uncomplicated PWM solution in applications requiring high efficiency can use the Vishay Si9114A switching controller to achieve switching frequencies up to 1MHz for size, cost and reliability improvements.

The Si9114A uses a constant-frequency, current-mode architecture with less than 50% duty cycle to enable a straightforward solution that avoids core-reset issues. The design minimises shoot-through current to enhance reliability as well as boosting efficiency by reducing supply-current requirements.

The integrated, high-voltage DMOS transistor allows direct interfacing to a 200V bus, to enable efficient and straightforward designs. In addition, the oscillator sync output allows converters to be synchronised in phase as well as in frequency, in a master/slave configuration.

Integrated protection features include logic-controlled shutdown circuitry, soft-start capability and Under-Voltage Lockout (UVLO).

 

FEATURES 500mA/700mA source/sink current capability 1.5% accuracy voltage reference Error amplifier with 1.8MHz bandwidth 14-pin package Industrial temperature range

APPLICATIONS Switched-mode power supplies Distributed power architectures

 

Vishay Si9114A Switching Controller