ISL6744 is a low cost, primary side, double-ended controller intended for applications using full and half-bridge topologies for unregulated DC/DC converters. It is a voltage-mode PWM controller designed for half-bridge and full-bridge power supplies. It provides precise control of switching frequency, adjustable soft-start, precise deadtime control with deadtimes as low as 35ns, and overcurrent shutdown. Low start-up and operating currents allow for easy biasing in both AC/DC and DC/DC applications. This advanced BiCMOS design features low start-up and operating currents, adjustable switching frequency up to 1MHz, 1A FET drivers, and very low propagation delays for a fast response to overcurrent faults.
The ISL6744 is a low‑cost, primary‑side, double‑ended PWM controller for full‑bridge and half‑bridge DC‑DC converters. It provides precise switching‑frequency control, adjustable soft‑start, dead‑time control as low as 35 ns, and over‑current shutdown, with 1 A MOSFET gate drivers.
The document includes electrical specifications, pin descriptions, typical performance curves, layout recommendations, and a reference design for a 48 V‑to‑12 V, 8 A unregulated half‑bridge converter.
| Supply Voltage Range (Typical) | 9‑16 VDC |
|---|---|
| Start‑up Current | 100 yA |
| MOSFET Gate Driver Current | 1 A peak |
| Dead‑time Control Minimum | 35 ns |
| Thermal Shutdown Temperature | 145 °C |
The device has a start‑up current of 100 yA.
Each gate driver can source or sink 1 A peak current.
Dead‑time can be as short as 35 ns.