The ISL6753 is a high-performance, low-pin-count alternative zero-voltage switching (ZVS) full-bridge PWM controller. Like the ISL6551, it achieves ZVS operation by driving the upper bridge FETs at a fixed 50% duty cycle while the lower bridge FETS are trailing-edge modulated with adjustable resonant switching delays. Compared to the more familiar phase-shifted control method, this algorithm offers equivalent efficiency and improved overcurrent and light- load performance with less complexity in a lower pin count package. This advanced BiCMOS design features low operating current, adjustable oscillator frequency up to 2MHz, adjustable soft-start, internal over temperature protection, precision deadtime and resonant delay control, and short propagation delays. Additionally, Multi-Pulse Suppression ensures alternating output pulses at low duty cycles where pulse skipping may occur.
The ISL6753 is a high-performance, low-pin-count zero-voltage switching (ZVS) full-bridge PWM controller. It achieves ZVS operation by driving upper bridge FETs at a fixed 50% duty cycle while modulating lower bridge FETs with adjustable resonant switching delays. The device features low operating current, adjustable oscillator frequency up to 2MHz, internal over temperature protection, and multi-pulse suppression for low-duty-cycle operation. It is designed for ZVS full-bridge converters, telecom, datacom, and industrial power systems.
| Supply Voltage Range | 9-16 VDC |
|---|---|
| Operating Current | 11.0 - 15.5 mA |
| Reference Voltage | 4.850 - 5.150 V |
| Oscillator Frequency | Up to 2MHz |
| Thermal Shutdown | 130 - 150°C |
| Current Limit Threshold | 1.00V nominal |
The operating temperature range is -40°C to 105°C.
The maximum oscillator frequency is 2MHz.
The reference voltage has a 3% tolerance over line, load, and temperature.