ISL6745A

Key Features

• Precision duty cycle and deadtime control
• 100µA start-up current
• Adjustable delayed overcurrent shutdown and restart
• Adjustable oscillator frequency up to 2MHz
• 1A MOSFET gate drivers
• Adjustable soft-start
• Internal over-temperature protection
• 35ns control to output propagation delay
• Small size and minimal external component count
• Input undervoltage protection
• Pb-free (RoHS compliant)

Description

The ISL6745A is a low-cost, double-ended, voltage-mode PWM controller designed for half-bridge and full-bridge power supplies and line-regulated bus converters. It provides precise control of switching frequency, adjustable soft-start, and overcurrent shutdown. In addition, the ISL6745A allows for accurate adjustment of MOSFET non-overlap time ("dead time") with dead times as low as 35ns, allowing power engineers to optimize the efficiency of open-loop bus converters. The ISL6745A also includes a control voltage input for closed-loop PWM and line voltage feed-forward functions. The ISL6745A is identical to the ISL6745, but is optimized for higher noise environments.

Low start-up and operating currents allow for easy biasing in both AC/DC and DC/DC applications. This advanced BiCMOS design also features adjustable switching frequency up to 1MHz, 1A FET drivers, and very low propagation delays for a fast response to overcurrent faults. The ISL6745A is available in a space-saving 10 Ld MSOP package and is assured to meet rated specifications across a wide -40°C to +105°C temperature range.

Applications

• Half-bridge converters
• Full-bridge converters
• Line-regulated bus converters
• AC/DC power supplies
• Telecom, datacom, and file server power