ISL6551IB-T

Product Summary

The ISL6551IB-T is a zero voltage switching (ZVS) full-bridge PWM controller designed for isolated power systems. This part implements a unique control algorithm for fixed frequency ZVS current mode control, yielding high efficiency with low EMI. The two lower drivers are PWM-controlled on the trailing edge and employ resonant delay while the two upper drivers are driven at a fixed 50% duty cycle. In addition to the ISL6551IB-T, other external elements such as transformers, pulse transformers, capacitors, inductors and Schottky or synchronous rectifiers are required for a complete power supply solution. A detailed 200W telecom power supply reference design using the ISL6551IB-T with companion Intersil ICs, Supervisor And Monitor ISL6550 and Half-bridge Driver HIP2100, is presented in Application Note AN1002. The applications of the ISL6551IB-T include Full-Bridge and Push-Pull Converters, Power Supplies for Off-line and Telecom/Datacom, Power Supplies for High End Microprocessors and Servers.

Parametrics

ISL6551IB-T absolute maximum ratings: (1)Supply Voltage VDD, VDDP1, VDDP2: -0.3 to 16V; (2)Enable Inputs (ON/OFF, LATSD): VDD; (3)Power Good Sink Current (IDCOK): 5mA; (4)ESD Rating Human Body Model (Per MIL-STD-883 Method 3015.7): 3kV; (5)Machine Model (Per EIAJ ED-4701 Method C-111): 250V.

Features

ISL6551IB-T features: (1)High Speed PWM (up to 1MHz) for ZVS Full Bridge Control; (2)Current Mode Control Compatible; (3)High Current High-Side and Low-Side Totem-Pole Drivers; (4)Adjustable Resonant Delay for ZVS; (5)10MHz Error Amplifier Bandwidth; (6)Programmable Soft-Start; (7)Precision Bandgap Reference; (8)Latching Shutdown Input; (9)Non-latching Enable Input; (10)Adjustable Leading Edge Blanking; (11)Adjustable Dead Time Control; (12)Adjustable Ramp for Slope Compensation; (13)Fast Short-Circuit Protection (Hiccup Mode); (14)Adjustable Cycle-by-Cycle Peak Current Limiting; (15)Drive Signals to Implement Synchronous Rectification; (16)VDD Under-voltage Lockout; (17)Current Share Support; (18)±5% "In Regulation" Indication.

Diagrams