• 简体中文
• English

The ISL78223 is a high performance zero voltage switching(ZVS) full-bridge PWM controller. It achieves ZVS operation bydriving the upper bridge FETs at a fixed 50% duty cycle whilethe lower bridge FETs are trailing-edge modulated withadjustable resonant switching delays.

Adding to the ISL78223’s feature set are average currentmonitoring and soft-start. The average current signal may beused for average current limiting, current sharing circuits andaverage current mode control. Additionally, the ISL78223supports both voltage and current mode control.

The ISL78223 features complemented PWM outputs forsynchronous rectifier (SR) control. The complemented outputsmay be dynamically advanced or delayed relative to the PWMoutputs using an external control voltage.

This advanced BiCMOS design features precision deadtimeand resonant delay control, and an oscillator adjustable to2MHz operating frequency. Additionally, Multi-PulseSuppression ensures alternating output pulses at low dutycycles where pulse skipping may occur.

The ISL78223 is rated for the automotive temperature range(-40°C to +105°C).

Key Features

• Adjustable resonant delay for ZVS operation
• Synchronous rectifier control outputs with adjustabledelay/advance
• Voltage or current mode control
• 3% current limit threshold
• Adjustable average current limit
• Adjustable deadtime control
• 175µA start-up current
• Supply UVLO
• Adjustable oscillator frequency up to 2MHz
• Internal over-temperature protection
• Buffered oscillator sawtooth output
• Fast current sense to output delay
• Adjustable cycle-by-cycle peak current limit
• 70ns leading edge blanking
• Multi-pulse suppression
• Pb-free (RoHS compliant)

Applications

• ZVS full-bridge converters
• Telecom and datacom power
• Wireless base station power
• File server power
• Industrial power systems