特性
- 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)
描述
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.
应用
- Half-bridge converters
- Full-bridge converters
- Line-regulated bus converters
- AC/DC power supplies
- Telecom, datacom and file server power
